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37 lines
1.0 KiB
37 lines
1.0 KiB
3 days ago
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#include "main.h"
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#include "bsp_pin.h"
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void bsp_pin_init(GPIO_TypeDef *port, uint16_t pin, uint8_t mode)
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{
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GPIO_InitTypeDef GPIO_InitStruct = {0};
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GPIO_InitStruct.Pin = pin;
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GPIO_InitStruct.Mode = (mode == 0) ? GPIO_MODE_OUTPUT_PP : GPIO_MODE_INPUT;
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if (mode == 1) GPIO_InitStruct.Pull = GPIO_PULLUP;
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else if (mode == 2) GPIO_InitStruct.Pull = GPIO_PULLDOWN;
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else GPIO_InitStruct.Pull = GPIO_NOPULL;
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if (mode == 0) GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
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HAL_GPIO_Init(port, &GPIO_InitStruct);
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}
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void delay_us(int nus)
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{
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uint32_t ticks;
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uint32_t told,tnow,tcnt=0;
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uint32_t reload=SysTick->LOAD; //LOAD的值
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ticks=nus*72; //需要的节拍数
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told=SysTick->VAL; //刚进入时的计数器值
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while(1)
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{
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tnow=SysTick->VAL;
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if(tnow!=told)
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{
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if(tnow<told)tcnt+=told-tnow; //这里注意一下SYSTICK是一个递减的计数器就可以了.
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else tcnt+=reload-tnow+told;
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told=tnow;
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if(tcnt>=ticks)break; //时间超过/等于要延迟的时间,则退出.
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}
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};
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}
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