串口分布
串口切换说明
1.默认所有的数据都使用串口0输出
官方提供了函数可以选择printf利用哪一个串口输出
配置printf使用串口1打印输出,波特率115200
(注:这样配置对于调试程序很有帮助,printf当做程序运行的日志打印)
void uart_init_new(void) { UART_WaitTxFifoEmpty(UART0); UART_WaitTxFifoEmpty(UART1); UART_ConfigTypeDef uart_config; uart_config.baud_rate = BIT_RATE_115200;//波特率 uart_config.data_bits = UART_WordLength_8b;//数据位数 uart_config.parity = USART_Parity_None;//奇偶校验 uart_config.stop_bits = USART_StopBits_1;//停止位 uart_config.flow_ctrl = USART_HardwareFlowControl_None;//硬件流控制 uart_config.UART_RxFlowThresh = 120; uart_config.UART_InverseMask = UART_None_Inverse; UART_ParamConfig(UART0, &uart_config); UART_ParamConfig(UART1, &uart_config);//串口1和串口0的配置一样 UART_IntrConfTypeDef uart_intr; //配置启用哪些些中断 数据接收超时 接收数据错误 缓存满中断 发送空中断 uart_intr.UART_IntrEnMask = UART_RXFIFO_TOUT_INT_ENA | UART_FRM_ERR_INT_ENA | UART_RXFIFO_FULL_INT_ENA | UART_TXFIFO_EMPTY_INT_ENA; uart_intr.UART_RX_FifoFullIntrThresh = 10;//接收数据个数超过10个字节进入FIFO满中断 uart_intr.UART_RX_TimeOutIntrThresh = 2;//超过两个字节的数据的时间没有接收到数据,进入接收超时中断 uart_intr.UART_TX_FifoEmptyIntrThresh = 20; UART_IntrConfig(UART0, &uart_intr); // UART_SetPrintPort(UART0); UART_SetPrintPort(UART1);//printf使用串口1输出 UART_intr_handler_register(uart0_rx_intr_handler, NULL); ETS_UART_INTR_ENABLE(); /* UART_SetWordLength(UART0,UART_WordLength_8b); UART_SetStopBits(UART0,USART_StopBits_1); UART_SetParity(UART0,USART_Parity_None); UART_SetBaudrate(UART0,74880); UART_SetFlowCtrl(UART0,USART_HardwareFlowControl_None,0); */ }
串口接收数据说明
1.该模块默认内部有个128字节的缓存区,默认接收的数据存入缓存区里面
在中断接收函数里面,从缓存里面获取数据
2.咱们在串口中断函数里面,是在满中断和接收超时中断里面获取串口接收的数据
串口接收数据典型程序
1.具体请参考: https://www.cnblogs.com/yangfengwu/p/11669373.html
2.uart.c
//串口数据接收处理方式:https://www.cnblogs.com/yangfengwu/p/11669373.html char Usart0ReadBuff[Usart0ReadLen]={0};//接收数据缓存 u32 Usart0ReadCnt = 0;//串口接收的数据个数 u32 Usart0ReadCntCopy = 0;//用于拷贝串口接收的数据个数 u32 Usart0IdleCnt = 0;//空闲时间累加变量 u32 Usart0IdleTime = 10;//设置串口空闲时间 u8 Usart0ReadFlage=0;//串口接收到一条完整的数据标志
LOCAL void uart0_rx_intr_handler(void *para) { uint8 RcvChar; uint8 uart_no = UART0;//UartDev.buff_uart_no; uint8 fifo_len = 0; uint8 buf_idx = 0; uint8 fifo_tmp[128] = {0}; uint32 uart_intr_status = READ_PERI_REG(UART_INT_ST(uart_no)) ; while (uart_intr_status != 0x0) { if (UART_FRM_ERR_INT_ST == (uart_intr_status & UART_FRM_ERR_INT_ST)) {//数据错误 //printf("FRM_ERR\r\n"); WRITE_PERI_REG(UART_INT_CLR(uart_no), UART_FRM_ERR_INT_CLR); } else if (UART_RXFIFO_FULL_INT_ST == (uart_intr_status & UART_RXFIFO_FULL_INT_ST)) {//FIFO满中断 // printf("full\r\n"); fifo_len = (READ_PERI_REG(UART_STATUS(UART0)) >> UART_RXFIFO_CNT_S)&UART_RXFIFO_CNT;//读取缓存了多少字节 buf_idx = 0; while (buf_idx < fifo_len) { if(Usart0ReadCnt>Usart0ReadLen){//预防数组溢出 Usart0ReadCnt=0; } Usart0ReadBuff[Usart0ReadCnt] = READ_PERI_REG(UART_FIFO(UART0)) & 0xFF;//把数据存入数组 Usart0ReadCnt++; // uart_tx_one_char(UART0, READ_PERI_REG(UART_FIFO(UART0)) & 0xFF);//从FIFO读取一字节数据并发送出去 // buf_idx++; } WRITE_PERI_REG(UART_INT_CLR(UART0), UART_RXFIFO_FULL_INT_CLR); } else if (UART_RXFIFO_TOUT_INT_ST == (uart_intr_status & UART_RXFIFO_TOUT_INT_ST)) {//接收超时中断 // printf("tout\r\n"); fifo_len = (READ_PERI_REG(UART_STATUS(UART0)) >> UART_RXFIFO_CNT_S)&UART_RXFIFO_CNT;//读取缓存了多少字节 buf_idx = 0; while (buf_idx < fifo_len) { if(Usart0ReadCnt>Usart0ReadLen){//预防数组溢出 Usart0ReadCnt=0; } Usart0ReadBuff[Usart0ReadCnt] = READ_PERI_REG(UART_FIFO(UART0)) & 0xFF;//把数据存入数组 Usart0ReadCnt++; // uart_tx_one_char(UART0, READ_PERI_REG(UART_FIFO(UART0)) & 0xFF);//从FIFO读取一字节数据并发送出去 // buf_idx++; } WRITE_PERI_REG(UART_INT_CLR(UART0), UART_RXFIFO_TOUT_INT_CLR); } else if (UART_TXFIFO_EMPTY_INT_ST == (uart_intr_status & UART_TXFIFO_EMPTY_INT_ST)) {//发送缓存为空 // printf("empty\n\r"); WRITE_PERI_REG(UART_INT_CLR(uart_no), UART_TXFIFO_EMPTY_INT_CLR); CLEAR_PERI_REG_MASK(UART_INT_ENA(UART0), UART_TXFIFO_EMPTY_INT_ENA); } else { //skip } uart_intr_status = READ_PERI_REG(UART_INT_ST(uart_no)) ; } }
3.uart.h
#define Usart0ReadLen 1024 //串口缓存的最大字节数
