//加入以下代码,支持printf函数,而不需要选择use MicroLIB #if 1 #pragma import(__use_no_semihosting) //标准库需要的支持函数 struct __FILE { int handle; }; FILE __stdout; //定义_sys_exit()以避免使用半主机模式 void _sys_exit(int x) { x = x; } //重定义fputc函数 int fputc(int ch, FILE *f) { while((USART1->SR&0X40)==0);//循环发送,直到发送完毕 USART1->DR = (u8) ch; return ch; } #endif #if EN_USART1_RX //如果使能了接收 //串口1中断服务程序 //注意,读取USARTx->SR能避免莫名其妙的错误 u8 USART_RX_BUF[USART_REC_LEN]; //接收缓冲,最大USART_REC_LEN个字节. //接收状态 //bit15， 接收完成标志 //bit14， 接收到0x0d //bit13~0， 接收到的有效字节数目 u16 USART_RX_STA=0; //接收状态标记 void uart_init(u32 bound){ //GPIO端口设置 GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA时钟 //USART1_TX GPIOA.9 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9 //USART1_RX GPIOA.10初始化 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入 GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10 //Usart1 NVIC 配置 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能 NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器 //USART 初始化设置 USART_InitStructure.USART_BaudRate = bound;//串口波特率 USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式 USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位 USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式 USART_Init(USART1, &USART_InitStructure); //初始化串口1 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断 USART_Cmd(USART1, ENABLE); //使能串口1 } void WK_UP_Init() { GPIO_InitTypeDef GPIO_InitStruct; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); GPIO_InitStruct.GPIO_Mode=GPIO_Mode_IPD; GPIO_InitStruct.GPIO_Pin=GPIO_Pin_0; GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz; GPIO_Init(GPIOA,&GPIO_InitStruct); } void TIM2_Cap_Init(u16 arr,u16 psc) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_ICInitTypeDef TIM_ICInitStruct; NVIC_InitTypeDef NVIC_InitStruct; //开启TIM2的时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); //初始化定时器2 TIM2 TIM_TimeBaseStructure.TIM_Period = arr; //设定计数器自动重装值 TIM_TimeBaseStructure.TIM_Prescaler =psc; //预分频器 TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式 TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位 //初始化输入捕获 TIM_ICInitStruct.TIM_Channel=TIM_Channel_1; TIM_ICInitStruct.TIM_ICFilter=0x00; TIM_ICInitStruct.TIM_ICPolarity=TIM_ICPolarity_Rising; TIM_ICInitStruct.TIM_ICPrescaler=TIM_ICPSC_DIV1; TIM_ICInitStruct.TIM_ICSelection=TIM_ICSelection_DirectTI; TIM_ICInit(TIM2,&TIM_ICInitStruct); //中断优先级分组 NVIC_InitStruct.NVIC_IRQChannel=TIM2_IRQn; NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=2; NVIC_InitStruct.NVIC_IRQChannelSubPriority=0; NVIC_Init(&NVIC_InitStruct); TIM_ITConfig(TIM2,TIM_IT_Update|TIM_IT_CC1,ENABLE); TIM_Cmd(TIM2,ENABLE ); //使能定时器2 } u8 TIM2CH1_CAPTURE_STA=0; //输入捕获状态 u16 TIM2CH1_CAPTURE_VAL; //输入捕获值 //定时器5中断服务程序 void TIM2_IRQHandler(void) { if((TIM2CH1_CAPTURE_STA&0X80)==0)//还未成功捕获 { if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) { if(TIM2CH1_CAPTURE_STA&0X40)//已经捕获到高电平了 { if((TIM2CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了 { TIM2CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次 TIM2CH1_CAPTURE_VAL=0XFFFF; }else TIM2CH1_CAPTURE_STA++; } } if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)//捕获1发生捕获事件 { if(TIM2CH1_CAPTURE_STA&0X40) //捕获到一个下降沿 { TIM2CH1_CAPTURE_STA|=0X80; //标记成功捕获到一次上升沿 TIM2CH1_CAPTURE_VAL=TIM_GetCapture1(TIM2); TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获 }else //还未开始,第一次捕获上升沿 { TIM2CH1_CAPTURE_STA=0; //清空 TIM2CH1_CAPTURE_VAL=0; TIM_SetCounter(TIM2,0); TIM2CH1_CAPTURE_STA|=0X40; //标记捕获到了上升沿 TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获 } } } TIM_ClearITPendingBit(TIM2, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位 } extern u8 TIM2CH1_CAPTURE_STA; //输入捕获状态 extern u16 TIM2CH1_CAPTURE_VAL; //输入捕获值 int main() { u32 temp=0; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// 设置中断优先级分组2 delay_init(); //延时函数初始化 WK_UP_Init(); uart_init(9600); //9600 TIM2_Cap_Init(0XFFFF,72-1); //以1Mhz的频率计数 while(1) { delay_ms(10); TIM_SetCompare1(TIM1,TIM_GetCapture1(TIM1)+1); if(TIM_GetCapture1(TIM1)==300)TIM_SetCompare1(TIM1,0); if(TIM2CH1_CAPTURE_STA&0X80)//成功捕获到了一次高电平 { temp=TIM2CH1_CAPTURE_STA&0X3F; temp*=65536/8; //溢出时间总和 temp+=TIM2CH1_CAPTURE_VAL; //得到总的高电平时间 printf("高电平时间:%d us ",temp); //打印总的高点平时间 TIM2CH1_CAPTURE_STA=0; //开启下一次捕获 } } return 0; }
先放之前的代码，然后写下主要的函数解析，中断就别瞎改了，你写的没人家的好
