/* * SPDX-FileCopyrightText: 2018-2021 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ /* * 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: $Id: porttimer_m.c,v 1.60 2013/08/13 15:07:05 Armink add Master Functions$ */ /* ----------------------- Platform includes --------------------------------*/ #include "port.h" /* ----------------------- Modbus includes ----------------------------------*/ #include "mb_m.h" #include "mbport.h" #include "port_serial_master.h" #include "sdkconfig.h" #define MB_US50_FREQ (20000) // 20kHz 1/20000 = 50mks #define MB_TICK_TIME_US (50) // 50uS = one tick for timer #define MB_TIMER_PRESCALLER ((TIMER_BASE_CLK / MB_US50_FREQ) - 1) #define MB_TIMER_SCALE (TIMER_BASE_CLK / TIMER_DIVIDER) #define MB_TIMER_DIVIDER ((TIMER_BASE_CLK / 1000000UL) * MB_TICK_TIME_US - 1) // divider for 50uS #define MB_TIMER_WITH_RELOAD (1) /* ----------------------- Variables ----------------------------------------*/ static USHORT usT35TimeOut50us; // Initialize Modbus Timer group and index used by stack static const USHORT usTimerIndex = CONFIG_FMB_MASTER_TIMER_INDEX; static const USHORT usTimerGroupIndex = CONFIG_FMB_MASTER_TIMER_GROUP; static timer_isr_handle_t xTimerIntHandle; // Timer interrupt handle /* ----------------------- static functions ---------------------------------*/ static void IRAM_ATTR vTimerGroupIsr(void *param) { assert((int)param == usTimerIndex); // Retrieve the the counter value from the timer that reported the interrupt timer_group_clr_intr_status_in_isr(usTimerGroupIndex, usTimerIndex); (void)pxMBMasterPortCBTimerExpired(); // Timer expired callback function // Enable alarm timer_group_enable_alarm_in_isr(usTimerGroupIndex, usTimerIndex); } /* ----------------------- Start implementation -----------------------------*/ BOOL xMBMasterPortTimersInit(USHORT usTimeOut50us) { MB_PORT_CHECK((usTimeOut50us > 0), FALSE, "Modbus timeout discreet is incorrect."); // Save timer reload value for Modbus T35 period usT35TimeOut50us = usTimeOut50us; esp_err_t xErr; timer_config_t config = { .alarm_en = TIMER_ALARM_EN, .auto_reload = MB_TIMER_WITH_RELOAD, .counter_dir = TIMER_COUNT_UP, .divider = MB_TIMER_PRESCALLER, .intr_type = TIMER_INTR_LEVEL, .counter_en = TIMER_PAUSE, }; // Configure timer xErr = timer_init(usTimerGroupIndex, usTimerIndex, &config); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "timer init failure, timer_init() returned (0x%x).", (uint32_t)xErr); // Stop timer counter xErr = timer_pause(usTimerGroupIndex, usTimerIndex); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "stop timer failure, timer_pause() returned (0x%x).", (uint32_t)xErr); // Reset counter value xErr = timer_set_counter_value(usTimerGroupIndex, usTimerIndex, 0x00000000ULL); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "timer set value failure, timer_set_counter_value() returned (0x%x).", (uint32_t)xErr); // wait3T5_us = 35 * 11 * 100000 / baud; // the 3.5T symbol time for baudrate // Set alarm value for usTimeOut50us * 50uS xErr = timer_set_alarm_value(usTimerGroupIndex, usTimerIndex, (uint32_t)(usTimeOut50us)); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "failure to set alarm failure, timer_set_alarm_value() returned (0x%x).", (uint32_t)xErr); // Register ISR for timer xErr = timer_isr_register(usTimerGroupIndex, usTimerIndex, vTimerGroupIsr, (void*)(uint32_t)usTimerIndex, MB_PORT_TIMER_ISR_FLAG, &xTimerIntHandle); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "timer set value failure, timer_isr_register() returned (0x%x).", (uint32_t)xErr); return TRUE; } // Set alarm value for usTimerTimeOut50us * 50uS static BOOL xMBMasterPortTimersEnable(USHORT usTimerTics50us) { MB_PORT_CHECK((usTimerTics50us > 0), FALSE, "incorrect tick value for timer = (0x%x).", (uint32_t)usTimerTics50us); esp_err_t xErr; xErr = timer_pause(usTimerGroupIndex, usTimerIndex); // stop timer MB_PORT_CHECK((xErr == ESP_OK), FALSE, "timer pause failure, timer_pause() returned (0x%x).", (uint32_t)xErr); xErr = timer_set_counter_value(usTimerGroupIndex, usTimerIndex, 0ULL); // reset timer MB_PORT_CHECK((xErr == ESP_OK), FALSE, "timer set counter failure, timer_set_counter_value() returned (0x%x).", (uint32_t)xErr); // Set alarm value to number of 50uS ticks xErr = timer_set_alarm_value(usTimerGroupIndex, usTimerIndex, (uint32_t)(usTimerTics50us)); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "timer set alarm failure, timer_set_alarm_value() returned (0x%x).", (uint32_t)xErr); xErr = timer_enable_intr(usTimerGroupIndex, usTimerIndex); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "timer enable interrupt failure, timer_enable_intr() returned (0x%x).", (uint32_t)xErr); xErr = timer_start(usTimerGroupIndex, usTimerIndex); // start timer MB_PORT_CHECK((xErr == ESP_OK), FALSE, "timer start failure, timer_start() returned (0x%x).", (uint32_t)xErr); return TRUE; } void vMBMasterPortTimersT35Enable(void) { USHORT usTimerTicks = usT35TimeOut50us; // Set current timer mode, don't change it. vMBMasterSetCurTimerMode(MB_TMODE_T35); // Set timer period (void)xMBMasterPortTimersEnable(usTimerTicks); } void vMBMasterPortTimersConvertDelayEnable(void) { // Covert time in milliseconds into ticks USHORT usTimerTicks = ((MB_MASTER_DELAY_MS_CONVERT * 1000) / MB_TICK_TIME_US); // Set current timer mode vMBMasterSetCurTimerMode(MB_TMODE_CONVERT_DELAY); ESP_LOGD(MB_PORT_TAG,"%s Convert delay enable.", __func__); (void)xMBMasterPortTimersEnable(usTimerTicks); } void vMBMasterPortTimersRespondTimeoutEnable(void) { USHORT usTimerTicks = (MB_MASTER_TIMEOUT_MS_RESPOND * 1000 / MB_TICK_TIME_US); vMBMasterSetCurTimerMode(MB_TMODE_RESPOND_TIMEOUT); ESP_LOGD(MB_PORT_TAG,"%s Respond enable timeout.", __func__); (void)xMBMasterPortTimersEnable(usTimerTicks); } void MB_PORT_ISR_ATTR vMBMasterPortTimersDisable() { if( (BOOL)xPortInIsrContext() ) { timer_group_set_counter_enable_in_isr(usTimerGroupIndex, usTimerIndex, TIMER_PAUSE); } else { // Stop timer and then reload timer counter value ESP_ERROR_CHECK(timer_pause(usTimerGroupIndex, usTimerIndex)); ESP_ERROR_CHECK(timer_set_counter_value(usTimerGroupIndex, usTimerIndex, 0ULL)); // Disable timer interrupt ESP_ERROR_CHECK(timer_disable_intr(usTimerGroupIndex, usTimerIndex)); } } void vMBMasterPortTimerClose(void) { ESP_ERROR_CHECK(timer_deinit(usTimerGroupIndex, usTimerIndex)); ESP_ERROR_CHECK(esp_intr_free(xTimerIntHandle)); }