kopia lustrzana https://github.com/micropython/micropython
185 wiersze
6.3 KiB
C
185 wiersze
6.3 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* This file initialises the USB (tinyUSB) and USART (SERCOM). Board USART settings
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* are set in 'boards/<board>/mpconfigboard.h.
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*
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* IMPORTANT: Please refer to "I/O Multiplexing and Considerations" chapters
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* in device datasheets for I/O Pin functions and assignments.
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Damien P. George
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* Copyright (c) 2022 Robert Hammelrath
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/runtime.h"
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#include "modmachine.h"
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#include "samd_soc.h"
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#include "sam.h"
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#include "tusb.h"
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#include "mphalport.h"
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extern void machine_rtc_start(bool force);
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static void usb_init(void) {
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// Init USB clock
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#if defined(MCU_SAMD21)
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GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK5 | GCLK_CLKCTRL_ID_USB;
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PM->AHBMASK.bit.USB_ = 1;
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PM->APBBMASK.bit.USB_ = 1;
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uint8_t alt = 6; // alt G, USB
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#elif defined(MCU_SAMD51)
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GCLK->PCHCTRL[USB_GCLK_ID].reg = GCLK_PCHCTRL_CHEN | GCLK_PCHCTRL_GEN_GCLK5;
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while (GCLK->PCHCTRL[USB_GCLK_ID].bit.CHEN == 0) {
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}
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MCLK->AHBMASK.bit.USB_ = 1;
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MCLK->APBBMASK.bit.USB_ = 1;
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uint8_t alt = 7; // alt H, USB
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#endif
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// Init USB pins
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PORT->Group[0].DIRSET.reg = 1 << 25 | 1 << 24;
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PORT->Group[0].OUTCLR.reg = 1 << 25 | 1 << 24;
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PORT->Group[0].PMUX[12].reg = alt << 4 | alt;
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PORT->Group[0].PINCFG[24].reg = PORT_PINCFG_PMUXEN;
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PORT->Group[0].PINCFG[25].reg = PORT_PINCFG_PMUXEN;
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}
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// Initialize the µs counter on TC 0/1 or TC4/5
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void init_us_counter(void) {
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#if defined(MCU_SAMD21)
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PM->APBCMASK.bit.TC3_ = 1; // Enable TC3 clock
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PM->APBCMASK.bit.TC4_ = 1; // Enable TC4 clock
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// Select multiplexer generic clock source and enable.
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GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK3 | GCLK_CLKCTRL_ID_TC4_TC5;
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// Wait while it updates synchronously.
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while (GCLK->STATUS.bit.SYNCBUSY) {
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}
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// configure the timer
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TC4->COUNT32.CTRLA.bit.MODE = TC_CTRLA_MODE_COUNT32_Val;
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TC4->COUNT32.CTRLA.bit.RUNSTDBY = 1;
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TC4->COUNT32.CTRLA.bit.ENABLE = 1;
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while (TC4->COUNT32.STATUS.bit.SYNCBUSY) {
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}
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TC4->COUNT32.READREQ.reg = TC_READREQ_RREQ | TC_READREQ_RCONT | 0x10;
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while (TC4->COUNT32.STATUS.bit.SYNCBUSY) {
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}
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// Enable the IRQ
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TC4->COUNT32.INTENSET.reg = TC_INTENSET_OVF;
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NVIC_EnableIRQ(TC4_IRQn);
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#elif defined(MCU_SAMD51)
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MCLK->APBAMASK.bit.TC0_ = 1; // Enable TC0 clock
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MCLK->APBAMASK.bit.TC1_ = 1; // Enable TC1 clock
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// Peripheral channel 9 is driven by GCLK3, 8 MHz.
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GCLK->PCHCTRL[TC0_GCLK_ID].reg = GCLK_PCHCTRL_GEN_GCLK3 | GCLK_PCHCTRL_CHEN;
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while (GCLK->PCHCTRL[TC0_GCLK_ID].bit.CHEN == 0) {
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}
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// configure the timer
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TC0->COUNT32.CTRLA.bit.PRESCALER = 0;
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TC0->COUNT32.CTRLA.bit.MODE = TC_CTRLA_MODE_COUNT32_Val;
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TC0->COUNT32.CTRLA.bit.RUNSTDBY = 1;
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TC0->COUNT32.CTRLA.bit.ENABLE = 1;
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while (TC0->COUNT32.SYNCBUSY.bit.ENABLE) {
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}
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// Enable the IRQ
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TC0->COUNT32.INTENSET.reg = TC_INTENSET_OVF;
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NVIC_EnableIRQ(TC0_IRQn);
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#endif
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}
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void samd_init(void) {
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init_clocks(get_cpu_freq());
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init_us_counter();
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usb_init();
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#if defined(MCU_SAMD51)
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mp_hal_ticks_cpu_enable();
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#endif
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machine_rtc_start(false);
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}
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#if MICROPY_PY_MACHINE_I2C || MICROPY_PY_MACHINE_SPI || MICROPY_PY_MACHINE_UART
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Sercom *sercom_instance[] = SERCOM_INSTS;
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MP_REGISTER_ROOT_POINTER(void *sercom_table[SERCOM_INST_NUM]);
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// Common Sercom functions used by all Serial devices
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void sercom_enable(Sercom *uart, int state) {
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uart->USART.CTRLA.bit.ENABLE = state; // Set the state on/off
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// Wait for the Registers to update.
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while (uart->USART.SYNCBUSY.bit.ENABLE) {
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}
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}
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void sercom_deinit_all(void) {
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for (int i = 0; i < SERCOM_INST_NUM; i++) {
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Sercom *uart = sercom_instance[i];
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uart->USART.INTENCLR.reg = 0xff;
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sercom_register_irq(i, NULL);
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sercom_enable(uart, 0);
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MP_STATE_PORT(sercom_table[i]) = NULL;
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}
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}
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#endif
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void samd_get_unique_id(samd_unique_id_t *id) {
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// Atmel SAM D21E / SAM D21G / SAM D21J
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// SMART ARM-Based Microcontroller
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// DATASHEET
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// 9.6 (SAMD51) or 9.3.3 (or 10.3.3 depending on which manual)(SAMD21) Serial Number
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//
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// EXAMPLE (SAMD21)
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// ----------------
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// OpenOCD:
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// Word0:
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// > at91samd21g18.cpu mdw 0x0080A00C 1
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// 0x0080a00c: 6e27f15f
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// Words 1-3:
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// > at91samd21g18.cpu mdw 0x0080A040 3
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// 0x0080a040: 50534b54 332e3120 ff091645
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//
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// MicroPython (this code and same order as shown in Arduino IDE)
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// >>> binascii.hexlify(machine.unique_id())
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// b'6e27f15f50534b54332e3120ff091645'
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#if defined(MCU_SAMD21)
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uint32_t *id_addresses[4] = {(uint32_t *)0x0080A00C, (uint32_t *)0x0080A040,
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(uint32_t *)0x0080A044, (uint32_t *)0x0080A048};
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#elif defined(MCU_SAMD51)
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uint32_t *id_addresses[4] = {(uint32_t *)0x008061FC, (uint32_t *)0x00806010,
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(uint32_t *)0x00806014, (uint32_t *)0x00806018};
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#endif
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for (int i = 0; i < 4; i++) {
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for (int k = 0; k < 4; k++) {
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// 'Reverse' the read bytes into a 32 bit word (Consistent with Arduino)
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id->bytes[4 * i + k] = (*(id_addresses[i]) >> (24 - k * 8)) & 0xff;
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}
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}
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}
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