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https://github.com/espressif/esp-idf.git
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9f9da9ec96
1. add hal and low-level layer for timer group 2. add callback functions to handle interrupt 3. add timer deinit function 4. add timer spinlock take function
201 lines
8.7 KiB
C
201 lines
8.7 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) 2013 Armink <armink.ztl@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* File: $Id: porttimer_m.c,v 1.60 2013/08/13 15:07:05 Armink add Master Functions$
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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_m.h"
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#include "mbport.h"
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#include "port_serial_master.h"
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#include "sdkconfig.h"
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#define MB_US50_FREQ (20000) // 20kHz 1/20000 = 50mks
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#define MB_TICK_TIME_US (50) // 50uS = one tick 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)
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#define MB_TIMER_DIVIDER ((TIMER_BASE_CLK / 1000000UL) * MB_TICK_TIME_US - 1) // divider for 50uS
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#define MB_TIMER_WITH_RELOAD (1)
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// Timer group and timer number to measure time (configurable in KConfig)
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#define MB_TIMER_INDEX (CONFIG_FMB_TIMER_INDEX)
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#define MB_TIMER_GROUP (CONFIG_FMB_TIMER_GROUP)
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/* ----------------------- Variables ----------------------------------------*/
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static USHORT usT35TimeOut50us;
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static const USHORT usTimerIndex = MB_TIMER_INDEX; // Initialize Modbus Timer index used by stack,
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static const USHORT usTimerGroupIndex = MB_TIMER_GROUP; // Timer group index used by stack
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static timer_isr_handle_t xTimerIntHandle; // Timer interrupt handle
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/* ----------------------- static functions ---------------------------------*/
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static void IRAM_ATTR vTimerGroupIsr(void *param)
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{
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assert((int)param == usTimerIndex);
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// Retrieve the the counter value from the timer that reported the interrupt
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timer_group_clr_intr_status_in_isr(usTimerGroupIndex, usTimerIndex);
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(void)pxMBMasterPortCBTimerExpired(); // Timer expired callback function
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// Enable alarm
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timer_group_enable_alarm_in_isr(usTimerGroupIndex, usTimerIndex);
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}
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/* ----------------------- Start implementation -----------------------------*/
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BOOL xMBMasterPortTimersInit(USHORT usTimeOut50us)
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{
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MB_PORT_CHECK((usTimeOut50us > 0), FALSE,
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"Modbus timeout discreet is incorrect.");
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// Save timer reload value for Modbus T35 period
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usT35TimeOut50us = usTimeOut50us;
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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 usTimeOut50us * 50uS
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xErr = timer_set_alarm_value(usTimerGroupIndex, usTimerIndex, (uint32_t)(usTimeOut50us));
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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,
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vTimerGroupIsr, (void*)(uint32_t)usTimerIndex, MB_PORT_TIMER_ISR_FLAG, &xTimerIntHandle);
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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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return TRUE;
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}
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// Set alarm value for usTimerTimeOut50us * 50uS
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static BOOL xMBMasterPortTimersEnable(USHORT usTimerTics50us)
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{
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MB_PORT_CHECK((usTimerTics50us > 0), FALSE,
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"incorrect tick value for timer = (0x%x).",
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(uint32_t)usTimerTics50us);
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esp_err_t xErr;
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xErr = timer_pause(usTimerGroupIndex, usTimerIndex); // stop timer
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"timer pause failure, timer_pause() returned (0x%x).",
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(uint32_t)xErr);
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xErr = timer_set_counter_value(usTimerGroupIndex, usTimerIndex, 0ULL); // reset timer
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"timer set counter failure, timer_set_counter_value() returned (0x%x).",
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(uint32_t)xErr);
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// Set alarm value to number of 50uS ticks
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xErr = timer_set_alarm_value(usTimerGroupIndex, usTimerIndex,
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(uint32_t)(usTimerTics50us));
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"timer set alarm failure, timer_set_alarm_value() returned (0x%x).",
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(uint32_t)xErr);
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xErr = timer_enable_intr(usTimerGroupIndex, usTimerIndex);
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"timer enable interrupt failure, timer_enable_intr() returned (0x%x).",
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(uint32_t)xErr);
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xErr = timer_start(usTimerGroupIndex, usTimerIndex); // start timer
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MB_PORT_CHECK((xErr == ESP_OK), FALSE,
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"timer start failure, timer_start() returned (0x%x).",
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(uint32_t)xErr);
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ESP_LOGD(MB_PORT_TAG,"%s Init timer.", __func__);
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return TRUE;
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}
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void vMBMasterPortTimersT35Enable(void)
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{
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USHORT usTimerTicks = usT35TimeOut50us;
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// Set current timer mode, don't change it.
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vMBMasterSetCurTimerMode(MB_TMODE_T35);
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// Set timer period
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(void)xMBMasterPortTimersEnable(usTimerTicks);
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}
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void vMBMasterPortTimersConvertDelayEnable(void)
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{
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// Covert time in milliseconds into ticks
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USHORT usTimerTicks = ((MB_MASTER_DELAY_MS_CONVERT * 1000) / MB_TICK_TIME_US);
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// Set current timer mode
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vMBMasterSetCurTimerMode(MB_TMODE_CONVERT_DELAY);
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ESP_LOGD(MB_PORT_TAG,"%s Convert delay enable.", __func__);
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(void)xMBMasterPortTimersEnable(usTimerTicks);
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}
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void vMBMasterPortTimersRespondTimeoutEnable(void)
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{
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USHORT usTimerTicks = (MB_MASTER_TIMEOUT_MS_RESPOND * 1000 / MB_TICK_TIME_US);
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vMBMasterSetCurTimerMode(MB_TMODE_RESPOND_TIMEOUT);
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ESP_LOGD(MB_PORT_TAG,"%s Respond enable timeout.", __func__);
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(void)xMBMasterPortTimersEnable(usTimerTicks);
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}
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void MB_PORT_ISR_ATTR
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vMBMasterPortTimersDisable()
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{
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if( (BOOL)xPortInIsrContext() ) {
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timer_group_set_counter_enable_in_isr(usTimerGroupIndex, usTimerIndex, TIMER_PAUSE);
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} else {
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// Stop timer and then reload timer counter value
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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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}
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}
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void vMBMasterPortTimerClose(void)
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{
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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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ESP_ERROR_CHECK(esp_intr_free(xTimerIntHandle));
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} |