F103执行程序时莫名死机，求助

麦克塔维什 · 发表于 2015-9-12 14:38:58

今天研究stm32的串口通信，写完代码运行的时候，执行到
USART_ITConfig(USART2, USART_IT_TC, ENABLE);
这一步时，程序莫名其妙地卡住了，用jlink调试的时候发现执行到 USART_ITConfig(USART2, USART_IT_TC, ENABLE); 时，如果按F11进入函数中然后单步执行，可以正常执行完，但是按F10直接下一步，单片机会死机。中断服务函数压根就没有进去。问一下是什么原因？

[mw_shl_code=c,true]#include "misc.h" #include "stm32f10x.h" void USART2_Init() { NVIC_InitTypeDef NVIC_InitStructure; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); /* Configure USART Tx as alternate function push-pull */ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); /* Configure USART Rx as input floating */ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_Init(GPIOA, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = 9600; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART2, &USART_InitStructure ); USART_Cmd(USART2, ENABLE); USART_ITConfig(USART2, USART_IT_TC, ENABLE); USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); } int global = 4; int main(void) { USART2_Init(); while (1) { USART_SendData(USART2, global); while (USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET); } return 0; } void USART2_IRQHandler() { global++; USART_ClearFlag(USART2, USART_FLAG_RXNE); USART_ClearFlag(USART2, USART_FLAG_TC); } [/mw_shl_code]