/* * SPDX-FileCopyrightText: 2010 Christian Walter * * SPDX-License-Identifier: BSD-3-Clause * * SPDX-FileContributor: 2016-2021 Espressif Systems (Shanghai) CO LTD */ /* * FreeModbus Libary: ESP32 Port Demo Application * Copyright (C) 2010 Christian Walter * * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * File: $Id: portother.c,v 1.1 2010/06/06 13:07:20 wolti Exp $ */ /* ----------------------- Platform includes --------------------------------*/ #include "port.h" /* ----------------------- Modbus includes ----------------------------------*/ #include "sdkconfig.h" #include "mb.h" #include "mbport.h" #include "driver/timer.h" #include "port_serial_slave.h" #include "sdkconfig.h" #if CONFIG_FMB_TIMER_PORT_ENABLED #define MB_US50_FREQ (20000) // 20kHz 1/20000 = 50mks #define MB_DISCR_TIME_US (50) // 50uS = one discreet for timer #define MB_TIMER_PRESCALLER ((TIMER_BASE_CLK / MB_US50_FREQ) - 1) #define MB_TIMER_SCALE (TIMER_BASE_CLK / TIMER_DIVIDER) // convert counter value to seconds #define MB_TIMER_DIVIDER ((TIMER_BASE_CLK / 1000000UL) * MB_DISCR_TIME_US - 1) // divider for 50uS #define MB_TIMER_WITH_RELOAD (1) static const USHORT usTimerIndex = CONFIG_FMB_TIMER_INDEX; // Modbus Timer index used by stack static const USHORT usTimerGroupIndex = CONFIG_FMB_TIMER_GROUP; // Modbus Timer group index used by stack static timer_isr_handle_t xTimerIntHandle; // Timer interrupt handle /* ----------------------- Start implementation -----------------------------*/ static void IRAM_ATTR vTimerGroupIsr(void *param) { assert((int)param == usTimerIndex); // Retrieve the counter value from the timer that reported the interrupt timer_group_clr_intr_status_in_isr(usTimerGroupIndex, usTimerIndex); (void)pxMBPortCBTimerExpired(); // Timer callback function // Enable alarm timer_group_enable_alarm_in_isr(usTimerGroupIndex, usTimerIndex); } #endif BOOL xMBPortTimersInit(USHORT usTim1Timerout50us) { #if CONFIG_FMB_TIMER_PORT_ENABLED MB_PORT_CHECK((usTim1Timerout50us > 0), FALSE, "Modbus timeout discreet is incorrect."); 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).", xErr); // Stop timer counter xErr = timer_pause(usTimerGroupIndex, usTimerIndex); MB_PORT_CHECK((xErr == ESP_OK), FALSE, "stop timer failure, timer_pause() returned (0x%x).", 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).", xErr); // wait3T5_us = 35 * 11 * 100000 / baud; // the 3.5T symbol time for baudrate // Set alarm value for usTim1Timerout50us * 50uS xErr = timer_set_alarm_value(usTimerGroupIndex, usTimerIndex, (uint32_t)(usTim1Timerout50us)); 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); #endif return TRUE; } void vMBPortTimersEnable(void) { #if CONFIG_FMB_TIMER_PORT_ENABLED ESP_ERROR_CHECK(timer_pause(usTimerGroupIndex, usTimerIndex)); ESP_ERROR_CHECK(timer_set_counter_value(usTimerGroupIndex, usTimerIndex, 0ULL)); ESP_ERROR_CHECK(timer_enable_intr(usTimerGroupIndex, usTimerIndex)); ESP_ERROR_CHECK(timer_start(usTimerGroupIndex, usTimerIndex)); #endif } void MB_PORT_ISR_ATTR vMBPortTimersDisable(void) { #if CONFIG_FMB_TIMER_PORT_ENABLED if( (BOOL)xPortInIsrContext() ) { timer_group_set_counter_enable_in_isr(usTimerGroupIndex, usTimerIndex, TIMER_PAUSE); } else { 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)); } #endif } void vMBPortTimerClose(void) { #ifdef CONFIG_FMB_TIMER_PORT_ENABLED ESP_ERROR_CHECK(timer_deinit(usTimerGroupIndex, usTimerIndex)); ESP_ERROR_CHECK(esp_intr_free(xTimerIntHandle)); #endif }