xTimerResetFromISR Exception

[papillon]

I am trying to reset a timer from within an ISR. The HW_IsrHandler is called when a button is pressed on pin 14, but resetting the timer generates a StoreProhibited exception at xTimerResetFromISR.

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#include <stdio.h>
#include <sys/time.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "driver/timer.h"
#include "freertos/timers.h"

TimerHandle_t timer=NULL;

void HW_IsrHandler(void* arg)
{
	gpio_num_t pin = (gpio_num_t) arg;
	if(gpio_get_level(pin)==0) {
		xTimerResetFromISR(timer, 1000 / portTICK_RATE_MS);
	}
}

void timerCallback(TimerHandle_t id) {
}

void app_main()
{
	uint8_t pin=14;
	timer=xTimerCreate("timer Callback", 1000 / portTICK_RATE_MS, pdFALSE, (void *)0, timerCallback);

	gpio_install_isr_service(0 );

	gpio_config_t io_conf;

	io_conf.pull_down_en = 0;
	io_conf.pull_up_en = 1;
	io_conf.intr_type = GPIO_INTR_ANYEDGE;
	io_conf.pin_bit_mask = (1<<pin);
	io_conf.mode = GPIO_MODE_INPUT;
	gpio_config(&io_conf);

	gpio_isr_handler_add(pin, HW_IsrHandler, (void*) &pin);
}

Any idea what could be causing this?
Thanks for your input!

[papillon]

The issue is that the ESP32 API differs from the FreeRTOS API. The FreeRTOS API has the following function:

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BaseType_t xTimerResetFromISR( TimerHandle_t xTimer, TickType_t xTicksToWait );

While the IDF has this one:

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BaseType_t xTimerResetFromISR( TimerHandle_t xTimer, BaseType_t *pxHigherPriorityTaskWoken );

The 2nd parameter is used for a different purpose. The compiler does not complain since the footprint is similar, but, obviously, execution causes an exception, because the parameter is used to return a status code.

Note that the xTimerReset function does not have the same issue, since both the IDF and the FreeRTOS version share the same declaration:

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BaseType_t xTimerReset( TimerHandle_t xTimer, TickType_t xTicksToWait );

[kolban]

I'm not sure I'm following .... if we look here ...

http://www.freertos.org/FreeRTOS-timers ... omISR.html

It appears that the FreeRTOS API for xTimerResetFromISR is:

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 BaseType_t xTimerResetFromISR(TimerHandle_t xTimer, BaseType_t *pxHigherPriorityTaskWoken);

which is distinct from:

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BaseType_t xTimerResetFromISR( TimerHandle_t xTimer, TickType_t xTicksToWait );

[papillon]

Indeed rather confusing.
It turns out that the latest version of the FreeRTOS manual I was using (available at http://www.freertos.org/Documentation/1 ... _Guide.pdf) only covers up to version 8 of the RTOS, whereas the IDF is based on version 9. And the software timer reset function was indeed changed in version 9, hence the confusion.

[WiFive]

IDF uses freertos 8.2.0. You're never going to use xTicksToWait in a FromISR function. It was probably just a brain fart, we all do it.