stm32标准延迟函数代码

#include "delay.h" //volite u32 TimingDelay define the volite __IO u32 TimingDelay; /** * @brief Configures the SysTick. * @param None * @retval None */ void SysTick_Init(void) { if (SysTick_Config(SystemCoreClock / 1000000)) { while(1); } SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; } /** * @brief Define the us delay function. * @param 传入延迟时间 * @retval None */ void delay_us(__IO u32 nTime) { TimingDelay = nTime; SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; while(TimingDelay != 0); SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; } /** * @brief Define the ms delay function. * @param 传入延迟时间 * @retval None */ void delay_ms(__IO u32 nTime) { TimingDelay = nTime * 1000; SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; while(TimingDelay != 0); SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; } /** * @brief Define the decreasing function. * @param None * @retval None */ void TimingDelay_Decrement(void) { if (TimingDelay != 0x00) { TimingDelay--; } } /** * @brief This function handles SysTick Handler. * @param None * @retval None */ void SysTick_Handler(void) { TimingDelay_Decrement(); }