请问esp32在rs485模式下单字节收发怎么做？

[mulinluo]

我的esp32一端通过wifi与电脑通信，另一端通过uart串口通信。当由电脑通过wifi发送数据到esp32，esp32再通过uart串口RS485模式将数据发送出去。
我的wifi端接收数据代码如下：

Code: Select all

void recv_data(void *pvParameters)
{
	uint32_t recvLen = 0;
	char *sendFromNetToUartBuff = (char *)malloc(NETRECEIVEBUFF);

	while(1){
		memset(sendFromNetToUartBuff, 0, NETRECEIVEBUFF);
		if(currentParameters.sWiFiModule.sWiFiModSel.WiFiTransPcolFlag == TCPCLIENT || currentParameters.sWiFiModule.sWiFiModSel.WiFiTransPcolFlag == TCPSERVER){
	    recvLen = recv(connect_socket, sendFromNetToUartBuff, 1, 0);
            if (recvLen > 0) {

            } else {
                show_socket_error_reason1("recv_data", connect_socket);
                break;
            }
		}
         else{
			ESP_LOGE(TAG, "WiFiTransPcolFlag configuration is invalid......");
			break;
		}
		uint8_t* newBuffer = (uint8_t*)malloc(recvLen+1);
		memset(newBuffer, 0, (recvLen+1));
		memcpy(newBuffer,sendFromNetToUartBuff,recvLen);

		uartNetTransmitCapsule_t* capsule = malloc(sizeof(uartNetTransmitCapsule_t));
		capsule->netRecvData = newBuffer;
		capsule->bufferSize = recvLen;

		ESP_LOGI(TAG, "Transmit.c: buffer is %s\n", newBuffer);

		if(!xQueueSend(queueToUart, capsule, 100/portTICK_RATE_MS)){
			xQueueReset(queueToUart);
			ESP_LOGE(TAG, "Failed to send net recv datas to uart recv task......");
			continue;
		}

		free(capsule);
	}
	ESP_LOGE(TAG, "Tcp recv data error......");
	isNetRecvTaskErrorTrigger = true;
	free(sendFromNetToUartBuff);
	xEventGroupSetBits(rs485EventGroup, UDP_RS485_RS232_BIT);
	vTaskDelete(NULL);
}

uart口发送数据代码如下：

Code: Select all

static void uartSendData(void *pvParameters)
{
	uint32_t recvLen, delayTickTimes;
	int netPacketTimes = 0;
	recvFromNetToUartBuff = (uartNetTransmitCapsule_t*)malloc(UART_Q_ITEM_SIZE);
	while(1){
		if(!xQueueReceive(queueToUart, recvFromNetToUartBuff, portMAX_DELAY)){
			ESP_LOGE(TAG, "Failed to receive datas from net to uart......");
			continue;
		}

		if(currentParameters.sPort[0].uiTransitMode == RS485_2_wires){
			netPacketTimes++;
  		        comportCurrentTransmitMode = RS485_TX_MODE;
			uart_disable_intr_mask(EX_UART_NUM, UART_INTR_MASK);
			
			recvLen = uart_write_bytes(EX_UART_NUM, (const char*) recvFromNetToUartBuff->netRecvData, 1);
			if(recvLen > 0){
				comportCurrentTransmitMode = RS485_RX_MODE;
				uart_flush(EX_UART_NUM);
				uart_enable_intr_mask(EX_UART_NUM, UART_INTR_MASK);
			}else{
				RS485TransmitToggle(RS485_RX_MODE);
				comportCurrentTransmitMode = RS485_RX_MODE;
				uart_flush(EX_UART_NUM);
				uart_enable_intr_mask(EX_UART_NUM, UART_INTR_MASK);
				free(recvFromNetToUartBuff->netRecvData);
				continue;
			}
		}else{
			recvLen = uart_write_bytes(EX_UART_NUM, (const char*) recvFromNetToUartBuff->netRecvData, recvFromNetToUartBuff->bufferSize);
			if(recvLen > 0){

			}else{
				free(recvFromNetToUartBuff->netRecvData);
				continue;
			}
		}
		free(recvFromNetToUartBuff->netRecvData);
	}
	free(recvFromNetToUartBuff);
	xSemaphoreGive(portManagerTaskSemaphore);
	vTaskDelete(NULL);

}

若我要一字节一字节的接收与发送，达到形如下图的波形效果，该如何改进呢？
下图所发数据为00 55 00 55 。
感谢！！！