#include "BspPhy.h" static uint32_t fac_us; static uint32_t fac_ms; void PhyDelayInit() { SysTick->CTRL |= SYSTICK_CLOCK_SOURCE_AHBCLK_NODIV; fac_us = system_core_clock / (1000000U); fac_ms = fac_us * (1000U); } void PhyDelayUs(uint32_t nus) { uint32_t temp = 0; SysTick->LOAD = (uint32_t)(nus * fac_us); SysTick->VAL = 0x00; SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk ; do { temp = SysTick->CTRL; }while((temp & 0x01) && !(temp & (1 << 16))); SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; SysTick->VAL = 0x00; } void PhyDelayMs(uint16_t nms) { uint32_t i; for (i = 0; i < nms; i++) PhyDelayUs(1000); } void PhyDelaySec(uint16_t sec) { uint16_t index; for(index = 0; index < sec; index++) { PhyDelayMs(500); PhyDelayMs(500); } } /******************************delay****************************************/ void PhyDelayInit(void); void PhyDelayUs(uint32_t nus); void PhyDelayMs(uint16_t nms); void PhyDelaySec(uint16_t sec); /*************************************************************************/
标签:AT32F421xx,CTRL,void,delay,uint16,SysTick,fac,uint32,外设 From: https://www.cnblogs.com/lum0126/p/16884084.html