HC32F460單片機(jī) 嘀嗒延時(shí)問題

ID:424805 · 發(fā)表于 2024-5-8 14:31

使用庫3.2.0時(shí)，自己的延時(shí)函數(shù)會(huì)造成芯片跑飛，串口漏打印。我測(cè)試以前庫1.21時(shí)，發(fā)現(xiàn)沒問題，具體原因不知道為什么。庫2.2.0也會(huì)造成這樣的問題。下面給出了嘀嗒延時(shí)初始化和毫秒延時(shí)函數(shù)，我在STM32F1的HAL庫使用也沒問題。
void delay_init(void)

{

SysTick->LOAD = (uint32_t)(SystemCoreClock / 1000); // 設(shè)置重裝載值1ms

NVIC_SetPriority(SysTick_IRQn, (1UL << __NVIC_PRIO_BITS) - 1UL); // 設(shè)置中斷

SysTick->VAL = 0UL; // 計(jì)數(shù)值清零

SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |

                  SysTick_CTRL_TICKINT_Msk |

                  SysTick_CTRL_ENABLE_Msk; // 選擇系統(tǒng)時(shí)鐘，使能中斷、時(shí)鐘
}

void delay_ms(uint32_t u32Cnt)
{
uint32_t ticks;
uint32_t told, tnow, tcnt = 0;
uint32_t reload = SysTick->LOAD; // 讀取重裝載值

ticks = u32Cnt * (SystemCoreClock / 1000); // 轉(zhuǎn)換成1ms基本單位的節(jié)拍
told = SysTick->VAL;
while (1)
{
      tnow = SysTick->VAL;
      if (tnow != told)
      {

         if (tnow < told)
            tcnt += told - tnow;
         else
            tcnt += reload - tnow + told;
         told = tnow;
         if(tcnt >1000000)
            {
            continue;
            }
         if (tcnt >= ticks)
            break;
      }
}
}