USART1和定时器3中断的冲突问题，，

Mask · 发表于 2016-11-18 07:32:52

程序里面开启定时器3的中断函数，，USART1不能收发数据，，，，把 “nvict_cfg.NVIC_IRQChannel = TIM3_IRQn“这个定义TIM3中断的注释掉，，USART1又能正常使用了，，请问这是什么原因，，怎么解决；

xuyan021 · 发表于 2016-11-18 08:05:21

上程序，只是这样说不太好说明问题。

Mask · 发表于 2016-11-18 08:11:51

xuyan021 发表于 2016-11-18 08:05
上程序，只是这样说不太好说明问题。

好的
void TIM2_init(void)
{
TIM_TimeBaseInitTypeDef tim2_cfg;
NVIC_InitTypeDef nvict_cfg;
TIM_ICInitTypeDef tim2_iccfg;
GPIO_InitTypeDef gpio_cfg;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);

gpio_cfg.GPIO_Pin = GPIO_Pin_0;
gpio_cfg.GPIO_Mode = GPIO_Mode_IN_FLOATING;
gpio_cfg.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&gpio_cfg);

gpio_cfg.GPIO_Pin = GPIO_Pin_7;
gpio_cfg.GPIO_Mode = GPIO_Mode_Out_PP;
gpio_cfg.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&gpio_cfg);

tim2_cfg.TIM_Prescaler = 9999;
tim2_cfg.TIM_CounterMode = TIM_CounterMode_Up;
tim2_cfg.TIM_Period = 71;
tim2_cfg.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&tim2_cfg);

tim2_iccfg.TIM_Channel = TIM_Channel_1;
tim2_iccfg.TIM_ICPolarity = TIM_ICPolarity_Rising;
tim2_iccfg.TIM_ICSelection = TIM_ICSelection_DirectTI;
tim2_iccfg.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInit(TIM2,&tim2_iccfg);

TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC1,ENABLE);
TIM_Cmd(TIM3,ENABLE);

nvict_cfg.NVIC_IRQChannel = TIM2_IRQn;
nvict_cfg.NVIC_IRQChannelPreemptionPriority = 1 ;
nvict_cfg.NVIC_IRQChannelSubPriority = 0;
nvict_cfg.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&nvict_cfg);

}

void TIM2_IRQHandler(void)
{
if(TIM_GetITStatus(TIM2,TIM_IT_CC1)==SET)
{
cnt++;
Combination_str(cnt_str,cnt);
USART1_Write(cnt_str);
LED_OFF();
}
TIM_ClearFlag(TIM2,TIM_IT_CC1);

}

void USART1_SendByte(u8 Data)
{
while(!(USART_FLAG_TXE & USART1->SR));
USART1->DR = (Data & 0x00FF);
while(!(USART1->SR & USART_FLAG_TC));
}
void USART1_Write(u8 *str)
{
while(*str != '\0')
{
USART1_SendByte(*str++);
}

}

void USART1_Init(void)
{
GPIO_InitTypeDef gpio_cfg;
USART_InitTypeDef usart_cfg;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1|RCC_APB2Periph_AFIO,ENABLE);

gpio_cfg.GPIO_Mode = GPIO_Mode_AF_PP;
gpio_cfg.GPIO_Pin = GPIO_Pin_9;
gpio_cfg.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&gpio_cfg);

gpio_cfg.GPIO_Mode = GPIO_Mode_IN_FLOATING;
gpio_cfg.GPIO_Pin = GPIO_Pin_10;
gpio_cfg.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&gpio_cfg);

USART_DeInit(USART1);
usart_cfg.USART_BaudRate = 9200;
usart_cfg.USART_Mode = USART_Mode_Rx|USART_Mode_Tx;
usart_cfg.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
usart_cfg.USART_Parity = USART_Parity_No;
usart_cfg.USART_StopBits = USART_StopBits_1;
usart_cfg.USART_WordLength = USART_WordLength_8b;
USART_Init(USART1,&usart_cfg);
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
USART_Cmd(USART1,ENABLE);

}