kopia lustrzana https://github.com/Schildkroet/GRBL-Advanced
52 wiersze
1.5 KiB
C
52 wiersze
1.5 KiB
C
/*
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System32.c - System Implementation
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Part of STM32F4_HAL
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Copyright (c) 2017 Patrick F.
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STM32F4_HAL is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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STM32F4_HAL is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with STM32F4_HAL. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "System32.h"
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void SysTick_Init(void)
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{
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RCC_ClocksTypeDef RCC_Clocks;
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/* SysTick end of count event each 1ms */
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RCC_GetClocksFreq(&RCC_Clocks);
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SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);
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NVIC_SetPriority(SysTick_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), 5, 5));
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}
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// for 100 MHz STM32F411
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#define COUNTS_PER_MICROSECOND 33
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void Delay_us(volatile uint32_t us)
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{
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volatile uint32_t count = us * COUNTS_PER_MICROSECOND - 2;
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__asm volatile(" mov r0, %[count] \n\t"
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"1: subs r0, #1 \n\t"
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" bhi 1b \n\t"
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:
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: [count] "r" (count)
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: "r0");
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}
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void Delay_ms(volatile uint32_t ms)
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{
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while(ms--)
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Delay_us(999);
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}
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