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OVMS3-idf/components/freemodbus/port/porttimer_m.c
Alex Lisitsyn 1ab9e81729 freemodbus: fix nvs access failure 
place timer handler functions into IRAM
update timer port handlers
fix communication issues
fix offset issue in example
add kconfig option to place handlers into IRAM
2019-11-08 16:55:42 +08:00

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/* 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"
#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)
// 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)
/* ----------------------- 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 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_intr_clr_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;
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, (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);
ESP_LOGD(MB_PORT_TAG,"%s Init timer.", __func__);
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_pause(usTimerGroupIndex, usTimerIndex));
ESP_ERROR_CHECK(timer_disable_intr(usTimerGroupIndex, usTimerIndex));
ESP_ERROR_CHECK(esp_intr_free(xTimerIntHandle));
}
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