152 lines
6.6 KiB
C
152 lines
6.6 KiB
C
/* Copyright 2018 Espressif Systems (Shanghai) PTE LTD
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* FreeModbus Libary: ESP32 Port Demo Application
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* Copyright (C) 2010 Christian Walter <cwalter@embedded-solutions.at>
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*
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* IF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* File: $Id: portother.c,v 1.1 2010/06/06 13:07:20 wolti Exp $
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*/
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/* ----------------------- Platform includes --------------------------------*/
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#include "port.h"
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/* ----------------------- Modbus includes ----------------------------------*/
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#include "mb.h"
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#include "mbport.h"
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#include "driver/timer.h"
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#include "sdkconfig.h"
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#include "port_serial_slave.h"
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#ifdef CONFIG_FMB_TIMER_PORT_ENABLED
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#define MB_US50_FREQ (20000) // 20kHz 1/20000 = 50mks
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#define MB_DISCR_TIME_US (50) // 50uS = one discreet for timer
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#define MB_TIMER_PRESCALLER ((TIMER_BASE_CLK / MB_US50_FREQ) - 1);
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#define MB_TIMER_SCALE (TIMER_BASE_CLK / TIMER_DIVIDER) // convert counter value to seconds
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#define MB_TIMER_DIVIDER ((TIMER_BASE_CLK / 1000000UL) * MB_DISCR_TIME_US - 1) // divider for 50uS
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#define MB_TIMER_WITH_RELOAD (1)
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static const USHORT usTimerIndex = CONFIG_FMB_TIMER_INDEX; // Modbus Timer index used by stack
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static const USHORT usTimerGroupIndex = CONFIG_FMB_TIMER_GROUP; // Modbus Timer group index used by stack
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static timg_dev_t *MB_TG[2] = {&TIMERG0, &TIMERG1};
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/* ----------------------- Start implementation -----------------------------*/
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static void IRAM_ATTR vTimerGroupIsr(void *param)
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{
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// Retrieve the interrupt status and the counter value
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// from the timer that reported the interrupt
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uint32_t intr_status = MB_TG[usTimerGroupIndex]->int_st_timers.val;
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if (intr_status & BIT(usTimerIndex)) {
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MB_TG[usTimerGroupIndex]->int_clr_timers.val |= BIT(usTimerIndex);
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(void)pxMBPortCBTimerExpired(); // Timer callback function
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MB_TG[usTimerGroupIndex]->hw_timer[usTimerIndex].config.alarm_en = TIMER_ALARM_EN;
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}
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}
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#endif
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BOOL xMBPortTimersInit(USHORT usTim1Timerout50us)
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{
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#ifdef CONFIG_FMB_TIMER_PORT_ENABLED
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MB_PORT_CHECK((usTim1Timerout50us > 0), FALSE,
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"Modbus timeout discreet is incorrect.");
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esp_err_t xErr;
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timer_config_t config;
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config.alarm_en = TIMER_ALARM_EN;
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config.auto_reload = MB_TIMER_WITH_RELOAD;
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config.counter_dir = TIMER_COUNT_UP;
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config.divider = MB_TIMER_PRESCALLER;
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config.intr_type = TIMER_INTR_LEVEL;
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config.counter_en = TIMER_PAUSE;
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// Configure timer
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xErr = timer_init(usTimerGroupIndex, usTimerIndex, &config);
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"timer init failure, timer_init() returned (0x%x).", (uint32_t)xErr);
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// Stop timer counter
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xErr = timer_pause(usTimerGroupIndex, usTimerIndex);
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"stop timer failure, timer_pause() returned (0x%x).", (uint32_t)xErr);
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// Reset counter value
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xErr = timer_set_counter_value(usTimerGroupIndex, usTimerIndex, 0x00000000ULL);
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"timer set value failure, timer_set_counter_value() returned (0x%x).",
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(uint32_t)xErr);
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// wait3T5_us = 35 * 11 * 100000 / baud; // the 3.5T symbol time for baudrate
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// Set alarm value for usTim1Timerout50us * 50uS
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xErr = timer_set_alarm_value(usTimerGroupIndex, usTimerIndex, (uint32_t)(usTim1Timerout50us));
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"failure to set alarm failure, timer_set_alarm_value() returned (0x%x).",
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(uint32_t)xErr);
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// Register ISR for timer
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xErr = timer_isr_register(usTimerGroupIndex, usTimerIndex, vTimerGroupIsr, NULL, ESP_INTR_FLAG_IRAM, NULL);
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"timer set value failure, timer_isr_register() returned (0x%x).",
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(uint32_t)xErr);
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#endif
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return TRUE;
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}
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void vMBPortTimersEnable()
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{
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#ifdef CONFIG_FMB_TIMER_PORT_ENABLED
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ESP_ERROR_CHECK(timer_pause(usTimerGroupIndex, usTimerIndex));
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ESP_ERROR_CHECK(timer_set_counter_value(usTimerGroupIndex, usTimerIndex, 0ULL));
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ESP_ERROR_CHECK(timer_enable_intr(usTimerGroupIndex, usTimerIndex));
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ESP_ERROR_CHECK(timer_start(usTimerGroupIndex, usTimerIndex));
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#endif
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}
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void vMBPortTimersDisable()
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{
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#ifdef CONFIG_FMB_TIMER_PORT_ENABLED
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ESP_ERROR_CHECK(timer_pause(usTimerGroupIndex, usTimerIndex));
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ESP_ERROR_CHECK(timer_set_counter_value(usTimerGroupIndex, usTimerIndex, 0ULL));
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// Disable timer interrupt
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ESP_ERROR_CHECK(timer_disable_intr(usTimerGroupIndex, usTimerIndex));
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#endif
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}
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void vMBPortTimerClose()
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{
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#ifdef CONFIG_FMB_TIMER_PORT_ENABLED
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ESP_ERROR_CHECK(timer_pause(usTimerGroupIndex, usTimerIndex));
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ESP_ERROR_CHECK(timer_disable_intr(usTimerGroupIndex, usTimerIndex));
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#endif
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}
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