kopia lustrzana https://github.com/micropython/micropython
663 wiersze
25 KiB
C
663 wiersze
25 KiB
C
/* Teensyduino Core Library
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* http://www.pjrc.com/teensy/
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* Copyright (c) 2013 PJRC.COM, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* 1. The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* 2. If the Software is incorporated into a build system that allows
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* selection among a list of target devices, then similar target
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* devices manufactured by PJRC.COM must be included in the list of
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* target devices and selectable in the same manner.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "mk20dx128.h"
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extern unsigned long _stext;
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extern unsigned long _etext;
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extern unsigned long _sdata;
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extern unsigned long _edata;
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extern unsigned long _sbss;
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extern unsigned long _ebss;
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extern unsigned long _estack;
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//extern void __init_array_start(void);
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//extern void __init_array_end(void);
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extern int main (void);
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void ResetHandler(void);
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void _init_Teensyduino_internal_(void);
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void __libc_init_array(void);
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void fault_isr(void)
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{
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while (1) {
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// keep polling some communication while in fault
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// mode, so we don't completely die.
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if (SIM_SCGC4 & SIM_SCGC4_USBOTG) usb_isr();
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if (SIM_SCGC4 & SIM_SCGC4_UART0) uart0_status_isr();
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if (SIM_SCGC4 & SIM_SCGC4_UART1) uart1_status_isr();
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if (SIM_SCGC4 & SIM_SCGC4_UART2) uart2_status_isr();
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}
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}
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void unused_isr(void)
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{
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fault_isr();
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}
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extern volatile uint32_t systick_millis_count;
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void systick_default_isr(void)
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{
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systick_millis_count++;
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}
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void nmi_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void hard_fault_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void memmanage_fault_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void bus_fault_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void usage_fault_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void svcall_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void debugmonitor_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pendablesrvreq_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void systick_isr(void) __attribute__ ((weak, alias("systick_default_isr")));
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void dma_ch0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch3_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch4_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch5_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch6_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch7_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch8_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch9_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch10_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch11_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch12_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch13_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch14_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_ch15_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dma_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void mcm_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void flash_cmd_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void flash_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void low_voltage_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void wakeup_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void watchdog_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2c0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2c1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2c2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void spi0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void spi1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void spi2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void sdhc_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_message_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_bus_off_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_tx_warn_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_rx_warn_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void can0_wakeup_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2s0_tx_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void i2s0_rx_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart0_lon_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart0_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart0_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart1_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart1_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart2_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart2_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart3_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart3_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart4_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart4_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart5_status_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void uart5_error_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void adc0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void adc1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void cmp0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void cmp1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void cmp2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void ftm0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void ftm1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void ftm2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void ftm3_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void cmt_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void rtc_alarm_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void rtc_seconds_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pit0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pit1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pit2_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pit3_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void pdb_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void usb_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void usb_charge_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dac0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void dac1_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void tsi0_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void mcg_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void lptmr_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void porta_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void portb_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void portc_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void portd_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void porte_isr(void) __attribute__ ((weak, alias("unused_isr")));
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void software_isr(void) __attribute__ ((weak, alias("unused_isr")));
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// TODO: create AVR-stype ISR() macro, with default linkage to undefined handler
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//
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__attribute__ ((section(".vectors"), used))
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void (* const gVectors[])(void) =
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{
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(void (*)(void))((unsigned long)&_estack), // 0 ARM: Initial Stack Pointer
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ResetHandler, // 1 ARM: Initial Program Counter
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nmi_isr, // 2 ARM: Non-maskable Interrupt (NMI)
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hard_fault_isr, // 3 ARM: Hard Fault
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memmanage_fault_isr, // 4 ARM: MemManage Fault
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bus_fault_isr, // 5 ARM: Bus Fault
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usage_fault_isr, // 6 ARM: Usage Fault
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fault_isr, // 7 --
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fault_isr, // 8 --
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fault_isr, // 9 --
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fault_isr, // 10 --
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svcall_isr, // 11 ARM: Supervisor call (SVCall)
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debugmonitor_isr, // 12 ARM: Debug Monitor
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fault_isr, // 13 --
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pendablesrvreq_isr, // 14 ARM: Pendable req serv(PendableSrvReq)
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systick_isr, // 15 ARM: System tick timer (SysTick)
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#if defined(__MK20DX128__)
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dma_ch0_isr, // 16 DMA channel 0 transfer complete
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dma_ch1_isr, // 17 DMA channel 1 transfer complete
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dma_ch2_isr, // 18 DMA channel 2 transfer complete
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dma_ch3_isr, // 19 DMA channel 3 transfer complete
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dma_error_isr, // 20 DMA error interrupt channel
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unused_isr, // 21 DMA --
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flash_cmd_isr, // 22 Flash Memory Command complete
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flash_error_isr, // 23 Flash Read collision
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low_voltage_isr, // 24 Low-voltage detect/warning
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wakeup_isr, // 25 Low Leakage Wakeup
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watchdog_isr, // 26 Both EWM and WDOG interrupt
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i2c0_isr, // 27 I2C0
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spi0_isr, // 28 SPI0
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i2s0_tx_isr, // 29 I2S0 Transmit
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i2s0_rx_isr, // 30 I2S0 Receive
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uart0_lon_isr, // 31 UART0 CEA709.1-B (LON) status
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uart0_status_isr, // 32 UART0 status
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uart0_error_isr, // 33 UART0 error
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uart1_status_isr, // 34 UART1 status
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uart1_error_isr, // 35 UART1 error
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uart2_status_isr, // 36 UART2 status
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uart2_error_isr, // 37 UART2 error
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adc0_isr, // 38 ADC0
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cmp0_isr, // 39 CMP0
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cmp1_isr, // 40 CMP1
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ftm0_isr, // 41 FTM0
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ftm1_isr, // 42 FTM1
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cmt_isr, // 43 CMT
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rtc_alarm_isr, // 44 RTC Alarm interrupt
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rtc_seconds_isr, // 45 RTC Seconds interrupt
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pit0_isr, // 46 PIT Channel 0
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pit1_isr, // 47 PIT Channel 1
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pit2_isr, // 48 PIT Channel 2
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pit3_isr, // 49 PIT Channel 3
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pdb_isr, // 50 PDB Programmable Delay Block
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usb_isr, // 51 USB OTG
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usb_charge_isr, // 52 USB Charger Detect
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tsi0_isr, // 53 TSI0
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mcg_isr, // 54 MCG
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lptmr_isr, // 55 Low Power Timer
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porta_isr, // 56 Pin detect (Port A)
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portb_isr, // 57 Pin detect (Port B)
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portc_isr, // 58 Pin detect (Port C)
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portd_isr, // 59 Pin detect (Port D)
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porte_isr, // 60 Pin detect (Port E)
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software_isr, // 61 Software interrupt
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#elif defined(__MK20DX256__)
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dma_ch0_isr, // 16 DMA channel 0 transfer complete
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dma_ch1_isr, // 17 DMA channel 1 transfer complete
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dma_ch2_isr, // 18 DMA channel 2 transfer complete
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dma_ch3_isr, // 19 DMA channel 3 transfer complete
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dma_ch4_isr, // 20 DMA channel 4 transfer complete
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dma_ch5_isr, // 21 DMA channel 5 transfer complete
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dma_ch6_isr, // 22 DMA channel 6 transfer complete
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dma_ch7_isr, // 23 DMA channel 7 transfer complete
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dma_ch8_isr, // 24 DMA channel 8 transfer complete
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dma_ch9_isr, // 25 DMA channel 9 transfer complete
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dma_ch10_isr, // 26 DMA channel 10 transfer complete
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dma_ch11_isr, // 27 DMA channel 10 transfer complete
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dma_ch12_isr, // 28 DMA channel 10 transfer complete
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dma_ch13_isr, // 29 DMA channel 10 transfer complete
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dma_ch14_isr, // 30 DMA channel 10 transfer complete
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dma_ch15_isr, // 31 DMA channel 10 transfer complete
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dma_error_isr, // 32 DMA error interrupt channel
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unused_isr, // 33 --
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flash_cmd_isr, // 34 Flash Memory Command complete
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flash_error_isr, // 35 Flash Read collision
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low_voltage_isr, // 36 Low-voltage detect/warning
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wakeup_isr, // 37 Low Leakage Wakeup
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watchdog_isr, // 38 Both EWM and WDOG interrupt
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unused_isr, // 39 --
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i2c0_isr, // 40 I2C0
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i2c1_isr, // 41 I2C1
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spi0_isr, // 42 SPI0
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spi1_isr, // 43 SPI1
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unused_isr, // 44 --
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can0_message_isr, // 45 CAN OR'ed Message buffer (0-15)
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can0_bus_off_isr, // 46 CAN Bus Off
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can0_error_isr, // 47 CAN Error
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can0_tx_warn_isr, // 48 CAN Transmit Warning
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can0_rx_warn_isr, // 49 CAN Receive Warning
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can0_wakeup_isr, // 50 CAN Wake Up
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i2s0_tx_isr, // 51 I2S0 Transmit
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i2s0_rx_isr, // 52 I2S0 Receive
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unused_isr, // 53 --
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unused_isr, // 54 --
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unused_isr, // 55 --
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unused_isr, // 56 --
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unused_isr, // 57 --
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unused_isr, // 58 --
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unused_isr, // 59 --
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uart0_lon_isr, // 60 UART0 CEA709.1-B (LON) status
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uart0_status_isr, // 61 UART0 status
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uart0_error_isr, // 62 UART0 error
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uart1_status_isr, // 63 UART1 status
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uart1_error_isr, // 64 UART1 error
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uart2_status_isr, // 65 UART2 status
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uart2_error_isr, // 66 UART2 error
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unused_isr, // 67 --
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unused_isr, // 68 --
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unused_isr, // 69 --
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unused_isr, // 70 --
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unused_isr, // 71 --
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unused_isr, // 72 --
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adc0_isr, // 73 ADC0
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adc1_isr, // 74 ADC1
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cmp0_isr, // 75 CMP0
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cmp1_isr, // 76 CMP1
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cmp2_isr, // 77 CMP2
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ftm0_isr, // 78 FTM0
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ftm1_isr, // 79 FTM1
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ftm2_isr, // 80 FTM2
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cmt_isr, // 81 CMT
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rtc_alarm_isr, // 82 RTC Alarm interrupt
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rtc_seconds_isr, // 83 RTC Seconds interrupt
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pit0_isr, // 84 PIT Channel 0
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pit1_isr, // 85 PIT Channel 1
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pit2_isr, // 86 PIT Channel 2
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pit3_isr, // 87 PIT Channel 3
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pdb_isr, // 88 PDB Programmable Delay Block
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usb_isr, // 89 USB OTG
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usb_charge_isr, // 90 USB Charger Detect
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unused_isr, // 91 --
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unused_isr, // 92 --
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unused_isr, // 93 --
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unused_isr, // 94 --
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unused_isr, // 95 --
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unused_isr, // 96 --
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dac0_isr, // 97 DAC0
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unused_isr, // 98 --
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tsi0_isr, // 99 TSI0
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mcg_isr, // 100 MCG
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lptmr_isr, // 101 Low Power Timer
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unused_isr, // 102 --
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porta_isr, // 103 Pin detect (Port A)
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portb_isr, // 104 Pin detect (Port B)
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portc_isr, // 105 Pin detect (Port C)
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portd_isr, // 106 Pin detect (Port D)
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porte_isr, // 107 Pin detect (Port E)
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unused_isr, // 108 --
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unused_isr, // 109 --
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software_isr, // 110 Software interrupt
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#endif
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};
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//void usb_isr(void)
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//{
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//}
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__attribute__ ((section(".flashconfig"), used))
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const uint8_t flashconfigbytes[16] = {
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0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF
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};
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// Automatically initialize the RTC. When the build defines the compile
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// time, and the user has added a crystal, the RTC will automatically
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// begin at the time of the first upload.
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#ifndef TIME_T
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#define TIME_T 1349049600 // default 1 Oct 2012 (never used, Arduino sets this)
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#endif
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extern void rtc_set(unsigned long t);
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static void startup_default_early_hook(void) { WDOG_STCTRLH = WDOG_STCTRLH_ALLOWUPDATE; }
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static void startup_default_late_hook(void) {}
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void startup_early_hook(void) __attribute__ ((weak, alias("startup_default_early_hook")));
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void startup_late_hook(void) __attribute__ ((weak, alias("startup_default_late_hook")));
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__attribute__ ((section(".startup")))
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void ResetHandler(void)
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{
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uint32_t *src = &_etext;
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uint32_t *dest = &_sdata;
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unsigned int i;
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#if F_CPU <= 2000000
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volatile int n;
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#endif
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WDOG_UNLOCK = WDOG_UNLOCK_SEQ1;
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WDOG_UNLOCK = WDOG_UNLOCK_SEQ2;
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__asm__ volatile ("nop");
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__asm__ volatile ("nop");
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// programs using the watchdog timer or needing to initialize hardware as
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// early as possible can implement startup_early_hook()
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startup_early_hook();
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// enable clocks to always-used peripherals
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#if defined(__MK20DX128__)
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SIM_SCGC5 = 0x00043F82; // clocks active to all GPIO
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SIM_SCGC6 = SIM_SCGC6_RTC | SIM_SCGC6_FTM0 | SIM_SCGC6_FTM1 | SIM_SCGC6_ADC0 | SIM_SCGC6_FTFL;
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#elif defined(__MK20DX256__)
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SIM_SCGC3 = SIM_SCGC3_ADC1 | SIM_SCGC3_FTM2;
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SIM_SCGC5 = 0x00043F82; // clocks active to all GPIO
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SIM_SCGC6 = SIM_SCGC6_RTC | SIM_SCGC6_FTM0 | SIM_SCGC6_FTM1 | SIM_SCGC6_ADC0 | SIM_SCGC6_FTFL;
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#endif
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// if the RTC oscillator isn't enabled, get it started early
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if (!(RTC_CR & RTC_CR_OSCE)) {
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RTC_SR = 0;
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RTC_CR = RTC_CR_SC16P | RTC_CR_SC4P | RTC_CR_OSCE;
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}
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// release I/O pins hold, if we woke up from VLLS mode
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if (PMC_REGSC & PMC_REGSC_ACKISO) PMC_REGSC |= PMC_REGSC_ACKISO;
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// since this is a write once register, make it visible to all F_CPU's
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// so we can into other sleep modes in the future at any speed
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SMC_PMPROT = SMC_PMPROT_AVLP | SMC_PMPROT_ALLS | SMC_PMPROT_AVLLS;
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// TODO: do this while the PLL is waiting to lock....
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while (dest < &_edata) *dest++ = *src++;
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dest = &_sbss;
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while (dest < &_ebss) *dest++ = 0;
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SCB_VTOR = 0; // use vector table in flash
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// default all interrupts to medium priority level
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for (i=0; i < NVIC_NUM_INTERRUPTS; i++) NVIC_SET_PRIORITY(i, 128);
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// hardware always starts in FEI mode
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// C1[CLKS] bits are written to 00
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// C1[IREFS] bit is written to 1
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// C6[PLLS] bit is written to 0
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// MCG_SC[FCDIV] defaults to divide by two for internal ref clock
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// I tried changing MSG_SC to divide by 1, it didn't work for me
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#if F_CPU <= 2000000
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// use the internal oscillator
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MCG_C1 = MCG_C1_CLKS(1) | MCG_C1_IREFS;
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// wait for MCGOUT to use oscillator
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while ((MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST(1)) ;
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for (n=0; n<10; n++) ; // TODO: why do we get 2 mA extra without this delay?
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MCG_C2 = MCG_C2_IRCS;
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while (!(MCG_S & MCG_S_IRCST)) ;
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// now in FBI mode:
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// C1[CLKS] bits are written to 01
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// C1[IREFS] bit is written to 1
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// C6[PLLS] is written to 0
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// C2[LP] is written to 0
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MCG_C2 = MCG_C2_IRCS | MCG_C2_LP;
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// now in BLPI mode:
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// C1[CLKS] bits are written to 01
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// C1[IREFS] bit is written to 1
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// C6[PLLS] bit is written to 0
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// C2[LP] bit is written to 1
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#else
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// enable capacitors for crystal
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OSC0_CR = OSC_SC8P | OSC_SC2P;
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// enable osc, 8-32 MHz range, low power mode
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MCG_C2 = MCG_C2_RANGE0(2) | MCG_C2_EREFS;
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// switch to crystal as clock source, FLL input = 16 MHz / 512
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MCG_C1 = MCG_C1_CLKS(2) | MCG_C1_FRDIV(4);
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// wait for crystal oscillator to begin
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while ((MCG_S & MCG_S_OSCINIT0) == 0) ;
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// wait for FLL to use oscillator
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while ((MCG_S & MCG_S_IREFST) != 0) ;
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// wait for MCGOUT to use oscillator
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while ((MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST(2)) ;
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// now in FBE mode
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// C1[CLKS] bits are written to 10
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// C1[IREFS] bit is written to 0
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// C1[FRDIV] must be written to divide xtal to 31.25-39 kHz
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// C6[PLLS] bit is written to 0
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// C2[LP] is written to 0
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#if F_CPU <= 16000000
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// if the crystal is fast enough, use it directly (no FLL or PLL)
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MCG_C2 = MCG_C2_RANGE0(2) | MCG_C2_EREFS | MCG_C2_LP;
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// BLPE mode:
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// C1[CLKS] bits are written to 10
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// C1[IREFS] bit is written to 0
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// C2[LP] bit is written to 1
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#else
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// if we need faster than the crystal, turn on the PLL
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#if F_CPU == 72000000
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MCG_C5 = MCG_C5_PRDIV0(5); // config PLL input for 16 MHz Crystal / 6 = 2.667 Hz
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#else
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MCG_C5 = MCG_C5_PRDIV0(3); // config PLL input for 16 MHz Crystal / 4 = 4 MHz
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#endif
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#if F_CPU == 168000000
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MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(18); // config PLL for 168 MHz output
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#elif F_CPU == 144000000
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MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(12); // config PLL for 144 MHz output
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#elif F_CPU == 120000000
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MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(6); // config PLL for 120 MHz output
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#elif F_CPU == 72000000
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MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(3); // config PLL for 72 MHz output
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#else
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MCG_C6 = MCG_C6_PLLS | MCG_C6_VDIV0(0); // config PLL for 96 MHz output
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#endif
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// wait for PLL to start using xtal as its input
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while (!(MCG_S & MCG_S_PLLST)) ;
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// wait for PLL to lock
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while (!(MCG_S & MCG_S_LOCK0)) ;
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// now we're in PBE mode
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#endif
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#endif
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// now program the clock dividers
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#if F_CPU == 168000000
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// config divisors: 168 MHz core, 56 MHz bus, 33.6 MHz flash, USB = 168 * 2 / 7
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(2) | SIM_CLKDIV1_OUTDIV4(4);
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SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(6) | SIM_CLKDIV2_USBFRAC;
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#elif F_CPU == 144000000
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// config divisors: 144 MHz core, 48 MHz bus, 28.8 MHz flash, USB = 144 / 3
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(2) | SIM_CLKDIV1_OUTDIV4(4);
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SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(2);
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#elif F_CPU == 120000000
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// config divisors: 120 MHz core, 60 MHz bus, 24 MHz flash, USB = 128 * 2 / 5
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(4);
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SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(4) | SIM_CLKDIV2_USBFRAC;
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#elif F_CPU == 96000000
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// config divisors: 96 MHz core, 48 MHz bus, 24 MHz flash, USB = 96 / 2
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(3);
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SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(1);
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#elif F_CPU == 72000000
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// config divisors: 72 MHz core, 36 MHz bus, 24 MHz flash, USB = 72 * 2 / 3
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(2);
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SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(2) | SIM_CLKDIV2_USBFRAC;
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#elif F_CPU == 48000000
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// config divisors: 48 MHz core, 48 MHz bus, 24 MHz flash, USB = 96 / 2
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(1) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(3);
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SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(1);
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#elif F_CPU == 24000000
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// config divisors: 24 MHz core, 24 MHz bus, 24 MHz flash, USB = 96 / 2
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(3) | SIM_CLKDIV1_OUTDIV2(3) | SIM_CLKDIV1_OUTDIV4(3);
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SIM_CLKDIV2 = SIM_CLKDIV2_USBDIV(1);
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#elif F_CPU == 16000000
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// config divisors: 16 MHz core, 16 MHz bus, 16 MHz flash
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(0) | SIM_CLKDIV1_OUTDIV4(0);
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#elif F_CPU == 8000000
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// config divisors: 8 MHz core, 8 MHz bus, 8 MHz flash
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(1) | SIM_CLKDIV1_OUTDIV2(1) | SIM_CLKDIV1_OUTDIV4(1);
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#elif F_CPU == 4000000
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// config divisors: 4 MHz core, 4 MHz bus, 2 MHz flash
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// since we are running from external clock 16MHz
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// fix outdiv too -> cpu 16/4, bus 16/4, flash 16/4
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// here we can go into vlpr?
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// config divisors: 4 MHz core, 4 MHz bus, 4 MHz flash
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(3) | SIM_CLKDIV1_OUTDIV2(3) | SIM_CLKDIV1_OUTDIV4(3);
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#elif F_CPU == 2000000
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// since we are running from the fast internal reference clock 4MHz
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// but is divided down by 2 so we actually have a 2MHz, MCG_SC[FCDIV] default is 2
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// fix outdiv -> cpu 2/1, bus 2/1, flash 2/2
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// config divisors: 2 MHz core, 2 MHz bus, 1 MHz flash
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SIM_CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0) | SIM_CLKDIV1_OUTDIV2(0) | SIM_CLKDIV1_OUTDIV4(1);
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#else
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#error "Error, F_CPU must be 168, 144, 120, 96, 72, 48, 24, 16, 8, 4, or 2 MHz"
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#endif
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#if F_CPU > 16000000
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// switch to PLL as clock source, FLL input = 16 MHz / 512
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MCG_C1 = MCG_C1_CLKS(0) | MCG_C1_FRDIV(4);
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// wait for PLL clock to be used
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while ((MCG_S & MCG_S_CLKST_MASK) != MCG_S_CLKST(3)) ;
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// now we're in PEE mode
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// USB uses PLL clock, trace is CPU clock, CLKOUT=OSCERCLK0
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SIM_SOPT2 = SIM_SOPT2_USBSRC | SIM_SOPT2_PLLFLLSEL | SIM_SOPT2_TRACECLKSEL | SIM_SOPT2_CLKOUTSEL(6);
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#else
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SIM_SOPT2 = SIM_SOPT2_TRACECLKSEL | SIM_SOPT2_CLKOUTSEL(3);
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#endif
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#if F_CPU <= 2000000
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// since we are not going into "stop mode" i removed it
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SMC_PMCTRL = SMC_PMCTRL_RUNM(2); // VLPR mode :-)
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#endif
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// initialize the SysTick counter
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SYST_RVR = (F_CPU / 1000) - 1;
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SYST_CSR = SYST_CSR_CLKSOURCE | SYST_CSR_TICKINT | SYST_CSR_ENABLE;
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//init_pins();
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__enable_irq();
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_init_Teensyduino_internal_();
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if (RTC_SR & RTC_SR_TIF) {
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// TODO: this should probably set the time more agressively, if
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// we could reliably detect the first reboot after programming.
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rtc_set(TIME_T);
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}
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__libc_init_array();
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startup_late_hook();
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main();
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while (1) ;
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}
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char *__brkval = (char *)&_ebss;
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void * _sbrk(int incr)
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{
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char *prev = __brkval;
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__brkval += incr;
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return prev;
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}
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__attribute__((weak))
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int _read(int file, char *ptr, int len)
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{
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return 0;
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}
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__attribute__((weak))
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int _close(int fd)
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{
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return -1;
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}
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#include <sys/stat.h>
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__attribute__((weak))
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int _fstat(int fd, struct stat *st)
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{
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st->st_mode = S_IFCHR;
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return 0;
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}
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__attribute__((weak))
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int _isatty(int fd)
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{
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return 1;
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}
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__attribute__((weak))
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int _lseek(int fd, long long offset, int whence)
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{
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return -1;
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}
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__attribute__((weak))
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void _exit(int status)
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{
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while (1);
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}
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__attribute__((weak))
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void __cxa_pure_virtual()
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{
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while (1);
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}
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__attribute__((weak))
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int __cxa_guard_acquire (char *g)
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{
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return !(*g);
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}
|
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|
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__attribute__((weak))
|
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void __cxa_guard_release(char *g)
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{
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*g = 1;
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}
|
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int nvic_execution_priority(void)
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{
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int priority=256;
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uint32_t primask, faultmask, basepri, ipsr;
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// full algorithm in ARM DDI0403D, page B1-639
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// this isn't quite complete, but hopefully good enough
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__asm__ volatile("mrs %0, faultmask\n" : "=r" (faultmask)::);
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if (faultmask) return -1;
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__asm__ volatile("mrs %0, primask\n" : "=r" (primask)::);
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if (primask) return 0;
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__asm__ volatile("mrs %0, ipsr\n" : "=r" (ipsr)::);
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if (ipsr) {
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if (ipsr < 16) priority = 0; // could be non-zero
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else priority = NVIC_GET_PRIORITY(ipsr - 16);
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}
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__asm__ volatile("mrs %0, basepri\n" : "=r" (basepri)::);
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if (basepri > 0 && basepri < priority) priority = basepri;
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return priority;
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}
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