Stm32 hal库usart2与hc-08透传模块实现通讯的过程是怎样的？

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答案对人有帮助，有参考价值 0 一、stm32cubeMX配置 1、配置RCC为外部晶振 2、配置时钟树 3、配置usart1 usart2 ，其中usart1将作为打印串口使用，蓝牙透传模块将使用usart2进行通讯，配置如下。 usart1 不用处理接收的数据，故不用打开中断，只需配置上面即可，我们重写fgetc函数以后，就可以使用printf函数。 usart2 配置如下打开usart2 中断最后配置中断优先级最后生成代码即可。二、数据解析 1、usart2中断函数，在中断函数里添加这句话， HAL_UART_Receive_IT(&huart2, mReceivemBuff, BUFFER_SIZE); 再次开启中断，不然接收到指定mReceivemBuff长度的数据后，就不会开启中断了。 /** * @brief This function handles USART2 global interrupt. / void USART2_IRQHandler(void) { / USER CODE BEGIN USART2_IRQn 0 / / USER CODE END USART2_IRQn 0 / HAL_UART_IRQHandler(&huart2); / USER CODE BEGIN USART2_IRQn 1 / HAL_UART_Receive_IT(&huart2, mReceiveBuff, BUFFER_SIZE); / USER CODE END USART2_IRQn 1 / } 2、中断回调函数。以数据 B5 5B 05 01 01 01 01 00 0D BC 为例，且BUFFER_SIZE为1 ，那么发送十个字节数据，HAL_UART_RxCpltCallback函数将会回调十次，每次返回一个数据，那么我们就要对数据头尾判断来截取我们需要的数据。 static uint16_t CRC16(uint8_t buf, uint16_t len) { uint8_t i; uint16_t crc = 0xffff; if (len == 0) { len = 1; } while (len--) { crc ^= buf; for (i = 0; i<8; i++) { if (crc & 1) { crc >>= 1; crc ^= 0xA001; } else { crc >>= 1; } } buf++; } return(crc); } static void handlerUart2Data(uint8_t mData, uint8_t mLen) { uint8_t mLedStatusCommand[10]= {0xb5,0x5B,0x05,0x01,0x00,0x00,0x00,0x00,0x00,0x00}; uint16_t mSendDataCrc = 0; uint16_t tempCrc = CRC16(mData,8); printf("crc==0x%xrn",tempCrc); if ((mData[0] == UART_DATA_HEAD_ONE) && (mData[1] == UART_DATA_HEAD_TWO) &&( (tempCrc&0x00ff)== mData[8]) && (((tempCrc>>8)&0x00ff) == mData[9])) { if(mData[3] == CMD_LED) { if (mData[4] == SET_CMD) { if (mData[5] == LED_NO_1) { if (mData[6] == CMD_ON) { mainRoomLedConfigure(LED_ON); saveLedDataByNum(LED_NO_1,LED_ON); }else if (mData[6] == CMD_OFF) { mainRoomLedConfigure(LED_OFF); saveLedDataByNum(LED_NO_1,LED_OFF); } } else if (mData[5] == LED_NO_2) { if (mData[6] == CMD_ON) { secondRoomLedConfigure(LED_ON); saveLedDataByNum(LED_NO_2,LED_ON); printf("get %drn",getLedDataByNum(LED_NO_2)); }else if (mData[6] == CMD_OFF) { secondRoomLedConfigure(LED_OFF); saveLedDataByNum(LED_NO_2,LED_OFF); printf("get %drn",getLedDataByNum(LED_NO_2)); } } HAL_UART_Transmit(&huart2, mData, mLen, 1000); } else if (mData[4] == GET_CMD){ // return all led status // apk send this data === {0xb5,0x5B,0x05,0x01,0x00,0x03,0x00,0x00,0x00,0x00} //and stm 32 send {0xb5,0x5B,0x05,0x01,0x00,0xxx,0xxx,0xxx,0x00,0x00} mLedStatusCommand[7] = getLedDataByNum(LED_NO_3); mLedStatusCommand[6] = getLedDataByNum(LED_NO_2); mLedStatusCommand[5] = getLedDataByNum(LED_NO_1); mSendDataCrc = CRC16(mLedStatusCommand,8); mLedStatusCommand[9] = (mSendDataCrc >> 8); mLedStatusCommand[8] = (mSendDataCrc & (0xff)); HAL_UART_Transmit(&huart2, mLedStatusCommand, mLen, 1000); } } else if(mData[3] == CMD_BEEP) { if (mData[4] == SET_CMD) { if (mData[5] == BEEP_NO_1){ if (mData[6] == CMD_ON){ setBeepStatus(1); saveBeepData(CMD_ON); }else if (mData[6] == CMD_OFF){ setBeepStatus(0); saveBeepData(CMD_OFF); } } //set success and send the same data to control device HAL_UART_Transmit(&huart2, mData, mLen, 1000); } }else if (mData[3] == 0x05){ int value = mData[5] 7 ; saveLedDataByNum(LED_NO_4,mData[5]); __HAL_TIM_SetCompare(&htim4, TIM_CHANNEL_4,value); HAL_UART_Transmit(&huart2, mData, mLen, 1000); } } else{ mData[8] = (tempCrc&0x00ff); mData[9] = ((tempCrc>>8)&0x00ff); HAL_UART_Transmit(&huart2, mData, mLen, 1000); } } void HAL_UART_RxCpltCallback(UART_HandleTypeDef huart) { Uart2_Buffer[Uart2_Rx] = mReceiveBuff[0]; Uart2_Rx++; Uart2_Rx &= 0xFF; if(Uart2_Buffer[Uart2_Rx-1] == 0xB5) { Uart2_head1 = Uart2_Rx-1; }else if((Uart2_Rx-1 == Uart2_head1+1)&&(Uart2_Buffer[Uart2_Rx-1] == 0x5B)) { Uart2_head2 = Uart2_Rx-1; }else if(Uart2_Rx-1 == Uart2_head2+1) { Uart2_Len = Uart2_Buffer [Uart2_Rx-1]; } else if(Uart2_Rx-1 == Uart2_head1 + Uart2_Len + 4) { Uart2_temp = CRC16(Uart2_Buffer,Uart2_Len+3); if(((Uart2_temp&0x00ff)==Uart2_Buffer[Uart2_head1+Uart2_Len+3])&&(((Uart2_temp>>8)&0x00ff)==Uart2_Buffer[Uart2_head1+Uart2_Len+4])) { //crc right and the data parse end and go to parse data Uart2_Sta = 1; } else { //crc wrong and set contorl device the right crc value Uart2_Buffer[Uart2_head1+Uart2_Len+3] = Uart2_temp&0x00ff; Uart2_Buffer[Uart2_head1+Uart2_Len+4] = (Uart2_temp>>8)&0x00ff; HAL_UART_Transmit(&huart2, Uart2_Buffer, Uart2_Rx, 1000); Uart2_Rx = 0; } } if(Uart2_Sta) { handlerUart2Data(Uart2_Buffer, Uart2_Rx); //parse data Uart2_Rx = 0; Uart2_Sta = 0; } } 假如规定所有的数据都是等长的，即定义BUFFER_SIZE为10 ，发送端每次发送十个字节，那么中断回调函数每次回调一次，处理数据就简单多了。直接对mReceiveBuff处理即可。 static void handlerUart2Data(uint8_t mData, uint8_t mLen) { uint8_t mLedStatusCommand[10]= {0xb5,0x5B,0x05,0x01,0x00,0x00,0x00,0x00,0x00,0x00}; uint16_t mSendDataCrc = 0; uint16_t tempCrc = CRC16(mData,8); printf("crc==0x%xrn",tempCrc); if ((mData[0] == UART_DATA_HEAD_ONE) && (mData[1] == UART_DATA_HEAD_TWO) &&( (tempCrc&0x00ff)== mData[8]) && (((tempCrc>>8)&0x00ff) == mData[9])) { if(mData[3] == CMD_LED) { if (mData[4] == SET_CMD) { if (mData[5] == LED_NO_1) { if (mData[6] == CMD_ON) { mainRoomLedConfigure(LED_ON); saveLedDataByNum(LED_NO_1,LED_ON); }else if (mData[6] == CMD_OFF) { mainRoomLedConfigure(LED_OFF); saveLedDataByNum(LED_NO_1,LED_OFF); } } else if (mData[5] == LED_NO_2) { if (mData[6] == CMD_ON) { secondRoomLedConfigure(LED_ON); saveLedDataByNum(LED_NO_2,LED_ON); printf("get %drn",getLedDataByNum(LED_NO_2)); }else if (mData[6] == CMD_OFF) { secondRoomLedConfigure(LED_OFF); saveLedDataByNum(LED_NO_2,LED_OFF); printf("get %drn",getLedDataByNum(LED_NO_2)); } } HAL_UART_Transmit(&huart2, mData, mLen, 1000); } else if (mData[4] == GET_CMD){ // return all led status // apk send this data === {0xb5,0x5B,0x05,0x01,0x00,0x03,0x00,0x00,0x00,0x00} //and stm 32 send {0xb5,0x5B,0x05,0x01,0x00,0xxx,0xxx,0xxx,0x00,0x00} mLedStatusCommand[7] = getLedDataByNum(LED_NO_3); mLedStatusCommand[6] = getLedDataByNum(LED_NO_2); mLedStatusCommand[5] = getLedDataByNum(LED_NO_1); mSendDataCrc = CRC16(mLedStatusCommand,8); mLedStatusCommand[9] = (mSendDataCrc >> 8); mLedStatusCommand[8] = (mSendDataCrc & (0xff)); HAL_UART_Transmit(&huart2, mLedStatusCommand, mLen, 1000); } } else if(mData[3] == CMD_BEEP) { if (mData[4] == SET_CMD) { if (mData[5] == BEEP_NO_1){ if (mData[6] == CMD_ON){ setBeepStatus(1); saveBeepData(CMD_ON); }else if (mData[6] == CMD_OFF){ setBeepStatus(0); saveBeepData(CMD_OFF); } } //set success and send the same data to control device HAL_UART_Transmit(&huart2, mData, mLen, 1000); } } } else{ mData[8] = (tempCrc&0x00ff); mData[9] = ((tempCrc>>8)&0x00ff); HAL_UART_Transmit(&huart2, mData, mLen, 1000); } } void HAL_UART_RxCpltCallback(UART_HandleTypeDef huart) { handlerUart2Data(mReceiveBuff, BUFFER_SIZE); //HAL_UART_Transmit(&huart2, mReceiveBuff, BUFFER_SIZE, 1000); } 另外发送数据用的函数为HAL_UART_Transmit(&huart2, mReceiveBuff, BUFFER_SIZE, 1000);

2022-2-18 10:34:33 评论举报李佳