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ESP32-S3 hardware timer interrupt doesn't work stable
Posted: Sat May 28, 2022 9:54 am
by markelov69
Hi, everyone.
I have timer and 1 tcp server task.
The problem is:
My timer interrupt code for debug is:
static bool IRAM_ATTR timer_group_isr_callback(void *args)
{
BaseType_t high_task_awoken = pdFALSE;
gpio_set_level(GPIO_NUM_48, 1);
gpio_set_level(GPIO_NUM_48, 0);
return high_task_awoken == pdTRUE; // return whether we need to yield at the end of ISR
}
Timer init code is:
static void example_tg_timer_init(int group, int timer, bool auto_reload, int timer_interval_sec)
{
/* Select and initialize basic parameters of the timer */
timer_config_t config = {
.divider = TIMER_DIVIDER,
.counter_dir = TIMER_COUNT_UP,
.counter_en = TIMER_PAUSE,
.alarm_en = TIMER_ALARM_EN,
.auto_reload = auto_reload,
}; // default clock source is APB
timer_init(group, timer, &config);
/* Timer's counter will initially start from value below.
Also, if auto_reload is set, this value will be automatically reload on alarm */
timer_set_counter_value(group, timer, 0);
/* Configure the alarm value and the interrupt on alarm. */
timer_set_alarm_value(group, timer, timer_interval_sec);
timer_enable_intr(group, timer);
example_timer_info_t *timer_info = calloc(1, sizeof(example_timer_info_t));
timer_info->timer_group = group;
timer_info->timer_idx = timer;
timer_info->auto_reload = auto_reload;
timer_info->alarm_interval = timer_interval_sec;
timer_isr_callback_add(group, timer, timer_group_isr_callback, timer_info, 0);
timer_start(group, timer);
}
// ....
example_tg_timer_init(TIMER_GROUP_1, TIMER_1, true, (1814 / 2));
What can i do, to make timer interrupts work stable?
Re: ESP32-S3 hardware timer interrupt doesn't work stable
Posted: Sun May 29, 2022 4:58 am
by username
I tired your code on my ESP32-S3, it was missing some parts like:
#define TIMER_DIVIDER (16) // Hardware timer clock divider
typedef struct {
int timer_group;
int timer_idx;
int alarm_interval;
bool auto_reload;
} example_timer_info_t;
But it worked fine for me.
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Re: ESP32-S3 hardware timer interrupt doesn't work stable
Posted: Sun May 29, 2022 9:24 am
by markelov69
I use
#define TIMER_DIVIDER (2) // Hardware timer clock divider
To reply my issue you need to add some task, not only timer, in my case it tcp_server.
xTaskCreate(tcp_server_task, "tcp_server", 4096, NULL, 1, NULL);
And when it start to receive data through wi-fi i see unstable interrupts.
Re: ESP32-S3 hardware timer interrupt doesn't work stable
Posted: Mon May 30, 2022 2:19 am
by username
To reply my issue you need to add some task, not only timer, in my case it tcp_server.
Yes, I did that. you did not mention you were doing other things. So sounds like the problem lies there.
Re: ESP32-S3 hardware timer interrupt doesn't work stable
Posted: Mon May 30, 2022 2:54 am
by ESP_Sprite
Could you try starting a task pinned to core 1 and initializing the timer interrupt there? Possibly your timer is pre-empted by WiFi interrupts at some point.
Re: ESP32-S3 hardware timer interrupt doesn't work stable
Posted: Tue Sep 20, 2022 6:08 am
by Weizzh
Hi，is it possible that a timer ISR operations are pre-empted by WiFi interrupts?
I have faced an identical problem: when wifi is working, especially transmitting data package(about 5kB/package) through mqtt, the timer isr sometimes misses.
ESP_Sprite wrote: ↑Mon May 30, 2022 2:54 am
Could you try starting a task pinned to core 1 and initializing the timer interrupt there? Possibly your timer is pre-empted by WiFi interrupts at some point.
Re: ESP32-S3 hardware timer interrupt doesn't work stable
Posted: Wed Sep 21, 2022 2:34 am
by ESP_Sprite
Yes, it's possible for WiFi to pre-empt other interrupts.