ESP32 Forum

Posted: **Thu May 04, 2023 11:48 am**

Hello,
I'm trying to set up an interrupt handler on GPIO36 (SENSOR_VP) ESP32 pin. Here are some parts of the code that I consider relevant:

Code: Select all

static void irq_handler_func(void* arg)
{
    xSemaphoreGiveFromISR(isr_sem, NULL);
}
.
.
.
static void parent_irq_handler_func(void* arg)
{
    irq_handler_func(arg);
}
.
.
.
static void init_func(void)
{
    gpio_config_t pin_irq_cfg =
    {
        .intr_type = GPIO_INTR_NEGEDGE,
        .pull_down_en = GPIO_PULLDOWN_DISABLE,
        .pull_up_en = GPIO_PULLUP_ENABLE,
        .mode = GPIO_MODE_INPUT,
        .pin_bit_mask = 1ULL << GPIO_NUM_36,
    };

    gpio_config(&pin_irq_cfg);

    gpio_isr_handler_add(GPIO_NUM_36, parent_irq_handler_func, NULL);
}
.
.
.
static void main_task(void* arg)
{
    while (1)
    {
        if (pdTRUE == xSemaphoreTake(isr_sem, portMAX_DELAY))
        {
            .
            .
            .
        }
    }
}

The problem is, when I generate the negative edge on GPIO36, ESP32 crashes with the following error:

Code: Select all

Guru Meditation Error: Core  0 panic'ed (InstrFetchProhibited). Exception was unhandled.

Core  0 register dump:
PC      : 0x00000002  PS      : 0x00060031  A0      : 0x80082d20  A1      : 0x3ffb0b30
A2      : 0x3ffc9b20  A3      : 0x00000050  A4      : 0x800fd9ba  A5      : 0x3ffca480
A6      : 0x3ffb32c0  A7      : 0x3ffca4a0  A8      : 0x800df4d6  A9      : 0xfffffff8
A10     : 0x3ffc9b20  A11     : 0x00060023  A12     : 0x8008d90e  A13     : 0x3ffca470
A14     : 0x00000003  A15     : 0x00060723  SAR     : 0x0000001c  EXCCAUSE: 0x00000014
EXCVADDR: 0x00000000  LBEG    : 0x00000000  LEND    : 0x00000000  LCOUNT  : 0x00000000

Backtrace:0xffffffff:0x3ffb0b300x40082d1d:0x3ffb0b50 0x40082155:0x3ffb0b80 0x4017a08f:0x3ffca4d0 0x400d3db2:0x3ffca4f0 0x4008b95d:0x3ffca510 0x4008d6bd:0x3ffca530
0x40082d1d: gpio_isr_loop at H:/esp-idf-v4.4/components/driver/gpio.c:416
 (inlined by) gpio_intr_service at H:/esp-idf-v4.4/components/driver/gpio.c:442

0x40082155: _xt_lowint1 at H:/esp-idf-v4.4/components/freertos/port/xtensa/xtensa_vectors.S:1111

0x4017a08f: cpu_ll_waiti at H:/esp-idf-v4.4/components/hal/esp32/include/hal/cpu_ll.h:183
 (inlined by) esp_pm_impl_waiti at H:/esp-idf-v4.4/components/esp_pm/pm_impl.c:837

0x400d3db2: esp_vApplicationIdleHook at H:/esp-idf-v4.4/components/esp_system/freertos_hooks.c:63

0x4008b95d: prvIdleTask at H:/esp-idf-v4.4/components/freertos/tasks.c:3974 (discriminator 1)

0x4008d6bd: vPortTaskWrapper at H:/esp-idf-v4.4/components/freertos/port/xtensa/port.c:131

It looks like the program counter register is getting the wrong address of the interrupt handler function. Why is this happening? Is it a problem when the interrupt function is calling another function?

Posted: **Fri May 05, 2023 1:55 am**

Did you call gpio_install_isr_service() anywhere?

Posted: **Sun May 07, 2023 8:26 pm**

ESP_Sprite wrote:Did you call gpio_install_isr_service() anywhere?

Yes, I forgot to mention that. Also, when I use the child function directly, the ISR executes fine. I'm not sure why using the parent function first (which calls the child function) fails.

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