[Resolved] How to use ESP32 timer in ESP-IDF?

[minetest2048]

I'm using DOIT ESP32 dev1 board with PlatformIO IDE and ESP-IDF framework, and I'm trying to blink the on board LED connected to GPIO pin 2 using timer interrupts, but for some reason the LED is stuck on and won't blink. Here is the code:

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1.  
2. #include <stdio.h>
3. #include "freertos/FreeRTOS.h"
4. #include "freertos/task.h"
5. #include "driver/gpio.h"
6. #include "sdkconfig.h"
7. #include "driver/periph_ctrl.h"
8. #include "driver/timer.h"
9.  
10. volatile uint8_t spkr_pin =  1;
11.  
12. // Forward declarations
13.  
14. void pinSetup(void);
15. void audiotest(void *pvParameter);
16. void timer_group0_isr (void *param);
17. void timer_config(void);
18.  
19.  
20.  
21.  
22. void app_main(){
23.      pinSetup();
24.      timer_config();
25.      xTaskCreate(&audiotest, "blink_task", configMINIMAL_STACK_SIZE, NULL, 5, NULL);
26. }
27.  
28.  
29.  
30.  
31.  
32. void audiotest(void *pvParameter){
33.     TickType_t xLastWakeTime = xTaskGetTickCount();
34.     const TickType_t xFrequency = 10;
35.     uint8_t pin =  0;
36.  
37.     while (1){
38.         vTaskDelayUntil( &xLastWakeTime, xFrequency );
39.         gpio_set_level(GPIO_NUM_22, pin);
40.         pin = !pin;
41.     }
42. }
43.  
44.  
45. void IRAM_ATTR timer_group0_isr (void *param){
46.     TIMERG0.int_clr_timers.t0 = 1; //clear interrupt bit
47.     gpio_set_level(GPIO_NUM_2, *(int *)param);
48.     *(int *)param = !*(int *)param ;
49. }
50.  
51. void timer_config(void){
52.     timer_config_t audio;
53.     audio.divider = 80; //Set prescaler for 1 MHz clock
54.     audio.counter_dir = TIMER_COUNT_UP;
55.     audio.alarm_en = 1;
56.     audio.intr_type = TIMER_INTR_LEVEL;
57.     audio.auto_reload = TIMER_AUTORELOAD_EN; // Reset timer to 0 when end condition is triggered
58.     audio.counter_en = TIMER_PAUSE;
59.     timer_init(TIMER_GROUP_0,0,&audio); //start timer 0 at group 0
60.     timer_set_counter_value(TIMER_GROUP_0,0,0); //set timer for 0
61.     timer_isr_register(TIMER_GROUP_0,0,&timer_group0_isr,&spkr_pin,ESP_INTR_FLAG_IRAM,NULL);
62.     timer_set_alarm_value(TIMER_GROUP_0,0,5000000);
63.     timer_enable_intr(TIMER_GROUP_0,0);
64.  
65.     timer_start(TIMER_GROUP_0,0);
66. }
67.  
68. void pinSetup (void) {
69.     gpio_pad_select_gpio(GPIO_NUM_22);
70.     gpio_set_direction(GPIO_NUM_22,GPIO_MODE_DEF_OUTPUT);
71.     gpio_pad_select_gpio(GPIO_NUM_2);
72.     gpio_set_direction(GPIO_NUM_2,GPIO_MODE_DEF_OUTPUT);
73. }
74.  

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I've been following https://docs.espressif.com/projects/esp ... timer.html , and the on board LED turns on 5 second after boot, which means that the interrupt handler got triggered, but then 5 second later the LED should turn off, but it doesn't turn off. Is there a code that is missing?

I also tried to follow the example code at https://github.com/espressif/esp-idf/bl ... ple_main.c , but there are some functions like timer_group_intr_clr_in_isr that doesn't exist in documentation or in my IDE

EDIT: after some googling I found out that you need to reenable the alarm after it is triggered, you can do that by using

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 TIMERG0.hw_timer[0].config.alarm_en = 1;

, my question is that is this equal to

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timer_set_alarm

?