esp-idf/components/freemodbus/port/porttimer_m.c

188 lines
7.9 KiB
C

/*
* SPDX-FileCopyrightText: 2018-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/*
* 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)
/* ----------------------- Variables ----------------------------------------*/
static USHORT usT35TimeOut50us;
// Initialize Modbus Timer group and index used by stack
static const USHORT usTimerIndex = CONFIG_FMB_MASTER_TIMER_INDEX;
static const USHORT usTimerGroupIndex = CONFIG_FMB_MASTER_TIMER_GROUP;
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_clr_intr_status_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 = {
.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).", (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);
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_deinit(usTimerGroupIndex, usTimerIndex));
ESP_ERROR_CHECK(esp_intr_free(xTimerIntHandle));
}