使用CH32V00x评估板,芯片是CH32V003F4P6。
在中定时中断函数里面设置一个变量为1,主函数while循环里判断这个变量,执行异常。
代码见下:
/********************************** (C) COPYRIGHT *******************************
* File Name : main.c
* Author : WCH
* Version : V1.0.0
* Date : 2024/08/23
* Description : CH32V003 Device Peripheral Access Layer System Header File.
*********************************************************************************
* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
* Attention: This software (modified or not) and binary are used for
* microcontroller manufactured by Nanjing Qinheng Microelectronics.
*******************************************************************************/
/*
*@Note
*TIMER_INT
*MODE 1 Timer count triggers update interrupt. Updata_time = psc*arr*RepetitionCounter/system
*MODE 2 generates an update event and triggers an update interrupt.
*
*/
#include"debug.h"
int runFlag = 0;
/* Mode Definition */
#defineMODE1 0
#defineMODE2 1
/* Mode Selection */
#defineMODE MODE1
//#define MODE MODE2
/*********************************************************************
* @fn TIM1_UP_IRQHandler
*
* @brief This function handles TIM1 UP exception.
*
*
* @return none
*/
void TIM1_UP_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
void TIM1_UP_IRQHandler(void)
{
if(TIM_GetITStatus(TIM1, TIM_IT_Update)==SET)
{
printf("--------updata\r\n");
runFlag = 1;
}
TIM_ClearITPendingBit( TIM1, TIM_IT_Update );
}
/*********************************************************************
* @fn TIM1_INT_Init
*
* @brief Initializes TIM1 output compare.
*
* @param arr - the period value.
* psc - the prescaler value.
*
* @return none
*/
void TIM1_INT_Init( u16 arr, u16 psc)
{
NVIC_InitTypeDef NVIC_InitStructure={0};
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure={0};
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE );
TIM_TimeBaseInitStructure.TIM_Period = arr;
TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 50;
TIM_TimeBaseInit( TIM1, &TIM_TimeBaseInitStructure);
TIM_ClearITPendingBit( TIM1, TIM_IT_Update );
NVIC_InitStructure.NVIC_IRQChannel =TIM1_UP_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =1;
NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
}
/*********************************************************************
* @fn main
*
* @brief Main program.
*
* @return none
*/
int main(void)
{
SystemCoreClockUpdate();
Delay_Init();
#if (SDI_PRINT==SDI_PR_OPEN)
SDI_Printf_Enable();
#else
USART_Printf_Init(115200);
#endif
printf("SystemClk:%d\r\n",SystemCoreClock);
printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
TIM1_INT_Init( 100-1, 4800-1);
#if(MODE==MODE1)
TIM_Cmd( TIM1, ENABLE );//0.5S
#elif(MODE==MODE2)
TIM_GenerateEvent(TIM1, TIM_IT_Update);
#endif
while(1)
{
//printf("\nrunFlag is %d\n",runFlag);
if( runFlag == 1 ){
runFlag = 0;
printf("--------run\r\n");
}
}
}
这样写的话,不会执行 printf("--------run\r\n");
但是只要改成这样:
while(1)
{
printf("\nrunFlag is %d\n",runFlag);
if( runFlag == 1 ){
runFlag = 0;
printf("--------run\r\n");
}
可以运行printf("--------run\r\n");
请问是什么原因