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yueming
2021-09-01 14:03:46 +08:00
parent 4e0dc1ed9d
commit 975adfb602
123 changed files with 59901 additions and 0 deletions
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53
firmware/stm32-esp/user/drive/bsp_clock.c Normal file
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#include "bsp_clock.h"
static uint8_t fac_us = 0;
static uint16_t fac_ms = 0;
//功能：systick初始化
void BSP_ClockInit(void)
{
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8); //选择外部时钟 HCLK/8
fac_us=SystemCoreClock/8000000;//为系统时钟的1/8
fac_ms = (uint16_t)fac_us*1000;
}
//功能：毫秒级延时,最多1864ms
void Delay_ms(uint32_t nms)
{
uint32_t temp = 0;
SysTick->LOAD=(uint32_t)nms*fac_ms;//时间加载(SysTick->LOAD为24bit)
SysTick->VAL =0x00; //清空计数器
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //开始倒数
do
{
temp=SysTick->CTRL;
}
while( (temp&0x01) && (!(temp&(1<<16))) );//等待时间到达
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
SysTick->VAL =0X00; //清空计数器
}
//功能：微秒级延时，最多1800ms
void Delay_us(uint32_t nus)
{
uint32_t temp;
SysTick->LOAD=nus*fac_us; //时间加载
SysTick->VAL=0x00; //清空计数器
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //开始倒数
do
{
temp=SysTick->CTRL;
}
while( (temp&0x01) && (!(temp&(1<<16))) );//等待时间到达
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
SysTick->VAL =0X00; //清空计数器
}