OVMS3-idf/components/freemodbus/port/porttimer_m.c
2019-05-21 09:09:01 +02:00

201 lines
8.6 KiB
C

/* 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 <armink.ztl@gmail.com>
*
* 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"
#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)
// Timer group and timer number to measure time (configurable in KConfig)
#define MB_TIMER_INDEX CONFIG_FMB_TIMER_INDEX
#define MB_TIMER_GROUP CONFIG_FMB_TIMER_GROUP
#define MB_TIMER_IO_LED 0
/* ----------------------- Variables ----------------------------------------*/
static USHORT usT35TimeOut50us;
static const USHORT usTimerIndex = MB_TIMER_INDEX; // Initialize Modbus Timer index used by stack,
static const USHORT usTimerGroupIndex = MB_TIMER_GROUP; // Timer group index used by stack
static timg_dev_t *MB_TG[2] = { &TIMERG0, &TIMERG1 };
/* ----------------------- static functions ---------------------------------*/
static void IRAM_ATTR vTimerGroupIsr(void *param)
{
// Retrieve the interrupt status and the counter value
// from the timer that reported the interrupt
uint32_t intr_status = MB_TG[usTimerGroupIndex]->int_st_timers.val;
if (intr_status & BIT(usTimerIndex)) {
MB_TG[usTimerGroupIndex]->int_clr_timers.val |= BIT(usTimerIndex);
MB_TG[usTimerGroupIndex]->hw_timer[usTimerIndex].update = 1;
(void)pxMBMasterPortCBTimerExpired(); // Timer expired callback function
// Enable alarm
MB_TG[usTimerGroupIndex]->hw_timer[usTimerIndex].config.alarm_en = TIMER_ALARM_EN;
}
}
/* ----------------------- 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;
config.alarm_en = TIMER_ALARM_EN;
config.auto_reload = MB_TIMER_WITH_RELOAD;
config.counter_dir = TIMER_COUNT_UP;
config.divider = MB_TIMER_PRESCALLER;
config.intr_type = TIMER_INTR_LEVEL;
config.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, NULL, ESP_INTR_FLAG_IRAM, NULL);
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);
//ESP_LOGD(MB_PORT_TAG,"%s Init timer.", __func__);
return TRUE;
}
void vMBMasterPortTimersT35Enable()
{
USHORT usTimerTicks = usT35TimeOut50us;
// Set current timer mode, don't change it.
vMBMasterSetCurTimerMode(MB_TMODE_T35);
// Set timer period
(void)xMBMasterPortTimersEnable(usTimerTicks);
}
void vMBMasterPortTimersConvertDelayEnable()
{
// 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()
{
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 vMBMasterPortTimersDisable()
{
// 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()
{
ESP_ERROR_CHECK(timer_pause(usTimerGroupIndex, usTimerIndex));
ESP_ERROR_CHECK(timer_disable_intr(usTimerGroupIndex, usTimerIndex));
}