/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * FreeModbus Libary: ESP32 Port Demo Application * Copyright (C) 2013 Armink * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * File: $Id: portserial.c,v 1.60 2013/08/13 15:07:05 Armink add Master Functions $ */ #include "port.h" /* ----------------------- Modbus includes ----------------------------------*/ #include "mb_m.h" #include "mbport.h" #include "mbrtu.h" #include "mbconfig.h" #include #include "driver/uart.h" #include "soc/dport_access.h" #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/queue.h" #include "esp_log.h" #include "sdkconfig.h" #include "port_serial_master.h" /* ----------------------- Static variables ---------------------------------*/ static const CHAR *TAG = "MB_MASTER_SERIAL"; // A queue to handle UART event. static QueueHandle_t xMbUartQueue; static TaskHandle_t xMbTaskHandle; // The UART hardware port number static UCHAR ucUartNumber = UART_NUM_MAX - 1; static BOOL bRxStateEnabled = FALSE; // Receiver enabled flag static BOOL bTxStateEnabled = FALSE; // Transmitter enabled flag void vMBMasterPortSerialEnable(BOOL bRxEnable, BOOL bTxEnable) { // This function can be called from xMBRTUTransmitFSM() of different task if (bTxEnable) { bTxStateEnabled = TRUE; } else { bTxStateEnabled = FALSE; } if (bRxEnable) { bRxStateEnabled = TRUE; vTaskResume(xMbTaskHandle); // Resume receiver task } else { vTaskSuspend(xMbTaskHandle); // Block receiver task bRxStateEnabled = FALSE; } } static USHORT usMBMasterPortSerialRxPoll(size_t xEventSize) { BOOL xReadStatus = TRUE; USHORT usCnt = 0; if (bRxStateEnabled) { while(xReadStatus && (usCnt++ <= MB_SERIAL_BUF_SIZE)) { // Call the Modbus stack callback function and let it fill the stack buffers. xReadStatus = pxMBMasterFrameCBByteReceived(); // callback to receive FSM } // The buffer is transferred into Modbus stack and is not needed here any more uart_flush_input(ucUartNumber); ESP_LOGD(TAG, "Received data: %d(bytes in buffer)\n", (uint32_t)usCnt); } else { ESP_LOGE(TAG, "%s: bRxState disabled but junk data (%d bytes) received. ", __func__, xEventSize); } return usCnt; } BOOL xMBMasterPortSerialTxPoll(void) { USHORT usCount = 0; BOOL bNeedPoll = TRUE; if( bTxStateEnabled ) { // Continue while all response bytes put in buffer or out of buffer while(bNeedPoll && (usCount++ < MB_SERIAL_BUF_SIZE)) { // Calls the modbus stack callback function to let it fill the UART transmit buffer. bNeedPoll = pxMBMasterFrameCBTransmitterEmpty( ); // callback to transmit FSM } ESP_LOGD(TAG, "MB_TX_buffer sent: (%d) bytes.", (uint16_t)(usCount - 1)); // Waits while UART sending the packet esp_err_t xTxStatus = uart_wait_tx_done(ucUartNumber, MB_SERIAL_TX_TOUT_TICKS); vMBMasterPortSerialEnable( TRUE, FALSE ); MB_PORT_CHECK((xTxStatus == ESP_OK), FALSE, "mb serial sent buffer failure."); return TRUE; } return FALSE; } // UART receive event task static void vUartTask(void* pvParameters) { uart_event_t xEvent; USHORT usResult = 0; for(;;) { if (xQueueReceive(xMbUartQueue, (void*)&xEvent, portMAX_DELAY) == pdTRUE) { ESP_LOGD(TAG, "MB_uart[%d] event:", ucUartNumber); switch(xEvent.type) { //Event of UART receiving data case UART_DATA: ESP_LOGD(TAG,"Data event, len: %d.", xEvent.size); // This flag set in the event means that no more // data received during configured timeout and UART TOUT feature is triggered if (xEvent.timeout_flag) { // Read received data and send it to modbus stack usResult = usMBMasterPortSerialRxPoll(xEvent.size); ESP_LOGD(TAG,"Timeout occured, processed: %d bytes", usResult); } break; //Event of HW FIFO overflow detected case UART_FIFO_OVF: ESP_LOGD(TAG, "hw fifo overflow."); xQueueReset(xMbUartQueue); break; //Event of UART ring buffer full case UART_BUFFER_FULL: ESP_LOGD(TAG, "ring buffer full."); xQueueReset(xMbUartQueue); uart_flush_input(ucUartNumber); break; //Event of UART RX break detected case UART_BREAK: ESP_LOGD(TAG, "uart rx break."); break; //Event of UART parity check error case UART_PARITY_ERR: ESP_LOGD(TAG, "uart parity error."); break; //Event of UART frame error case UART_FRAME_ERR: ESP_LOGD(TAG, "uart frame error."); break; default: ESP_LOGD(TAG, "uart event type: %d.", xEvent.type); break; } } } vTaskDelete(NULL); } /* ----------------------- Start implementation -----------------------------*/ BOOL xMBMasterPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity ) { esp_err_t xErr = ESP_OK; // Set communication port number ucUartNumber = ucPORT; // Configure serial communication parameters UCHAR ucParity = UART_PARITY_DISABLE; UCHAR ucData = UART_DATA_8_BITS; switch(eParity){ case MB_PAR_NONE: ucParity = UART_PARITY_DISABLE; break; case MB_PAR_ODD: ucParity = UART_PARITY_ODD; break; case MB_PAR_EVEN: ucParity = UART_PARITY_EVEN; break; default: ESP_LOGE(TAG, "Incorrect parity option: %d", eParity); return FALSE; } switch(ucDataBits){ case 5: ucData = UART_DATA_5_BITS; break; case 6: ucData = UART_DATA_6_BITS; break; case 7: ucData = UART_DATA_7_BITS; break; case 8: ucData = UART_DATA_8_BITS; break; default: ucData = UART_DATA_8_BITS; break; } uart_config_t xUartConfig = { .baud_rate = ulBaudRate, .data_bits = ucData, .parity = ucParity, .stop_bits = UART_STOP_BITS_1, .flow_ctrl = UART_HW_FLOWCTRL_DISABLE, .rx_flow_ctrl_thresh = 2, .source_clk = UART_SCLK_APB, }; // Set UART config xErr = uart_param_config(ucUartNumber, &xUartConfig); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "mb config failure, uart_param_config() returned (0x%x).", xErr); // Install UART driver, and get the queue. xErr = uart_driver_install(ucUartNumber, MB_SERIAL_BUF_SIZE, MB_SERIAL_BUF_SIZE, MB_QUEUE_LENGTH, &xMbUartQueue, MB_PORT_SERIAL_ISR_FLAG); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "mb serial driver failure, uart_driver_install() returned (0x%x).", xErr); // Set timeout for TOUT interrupt (T3.5 modbus time) xErr = uart_set_rx_timeout(ucUartNumber, MB_SERIAL_TOUT); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "mb serial set rx timeout failure, uart_set_rx_timeout() returned (0x%x).", xErr); // Set always timeout flag to trigger timeout interrupt even after rx fifo full uart_set_always_rx_timeout(ucUartNumber, true); // Create a task to handle UART events BaseType_t xStatus = xTaskCreate(vUartTask, "uart_queue_task", MB_SERIAL_TASK_STACK_SIZE, NULL, MB_SERIAL_TASK_PRIO, &xMbTaskHandle); if (xStatus != pdPASS) { vTaskDelete(xMbTaskHandle); // Force exit from function with failure MB_PORT_CHECK(FALSE, FALSE, "mb stack serial task creation error. xTaskCreate() returned (0x%x).", xStatus); } else { vTaskSuspend(xMbTaskHandle); // Suspend serial task while stack is not started } ESP_LOGD(MB_PORT_TAG,"%s Init serial.", __func__); return TRUE; } void vMBMasterPortSerialClose(void) { (void)vTaskDelete(xMbTaskHandle); ESP_ERROR_CHECK(uart_driver_delete(ucUartNumber)); } BOOL xMBMasterPortSerialPutByte(CHAR ucByte) { // Send one byte to UART transmission buffer // This function is called by Modbus stack UCHAR ucLength = uart_write_bytes(ucUartNumber, &ucByte, 1); return (ucLength == 1); } // Get one byte from intermediate RX buffer BOOL xMBMasterPortSerialGetByte(CHAR* pucByte) { assert(pucByte != NULL); USHORT usLength = uart_read_bytes(ucUartNumber, (uint8_t*)pucByte, 1, MB_SERIAL_RX_TOUT_TICKS); return (usLength == 1); }