ESP32 Forum

Posted: **Mon Dec 24, 2018 5:29 pm**

Hi.

In my project I'm using SPIFFS and some FreeRTOS tasks. One of this tasks (its LCD library) uses callback for ticks:

https://github.com/espressif/esp-idf/bl ... ooks.h#L90

Problem: each tasks works fine separatly. But when I'm trying use both I got crash:

Code: Select all

Guru Meditation Error: Core  0 panic'ed (Cache disabled but cached memory region
 accessed)
Core 0 register dump:
PC      : 0x400d632c  PS      : 0x00060034  A0      : 0x8008dcd5  A1      : 0x3f
fc05a0
0x400d632c: callback_tick_task at C:/Projects/ESP32/Projects/LCD_project/main/lvgl_tf
t.c:599

A2      : 0x00000001  A3      : 0x00000000  A4      : 0x00060920  A5      : 0x00
000001
A6      : 0x00060923  A7      : 0x00060023  A8      : 0x80081cc4  A9      : 0x3f
fc4728
A10     : 0x00000003  A11     : 0x00060923  A12     : 0x00060920  A13     : 0x00
000001
A14     : 0x00060920  A15     : 0x3ffbcac1  SAR     : 0x00000017  EXCCAUSE: 0x00
000007
EXCVADDR: 0x00000000  LBEG    : 0x00000000  LEND    : 0x00000000  LCOUNT  : 0x00
000000
Core 0 was running in ISR context:
EPC1    : 0x400838e9  EPC2    : 0x00000000  EPC3    : 0x00000000  EPC4    : 0x40
0d632c
0x400838e9: spi_flash_op_block_func at C:/Projects/ESP32/TOOLS/esp-idf/component
s/spi_flash/cache_utils.c:82 (discriminator 1)

0x400d632c: callback_tick_task at C:/Projects/ESP32/Projects/LCD_project/main/lvgl_tf
t.c:599


Backtrace: 0x400d632c:0x3ffc05a0 0x4008dcd2:0x3ffc05c0 0x4008e56f:0x3ffc05e0 0x4
008f0e5:0x3ffc0600 0x400825f2:0x3ffc0610 0x400838e6:0x00000000
0x400d632c: callback_tick_task at C:/Projects/ESP32/Projects/LCD_project/main/lvgl_tf
t.c:599

0x4008dcd2: xTaskIncrementTick at C:/Projects/ESP32/TOOLS/esp-idf/components/fre
ertos/tasks.c:3564

0x4008e56f: xPortSysTickHandler at C:/Projects/ESP32/TOOLS/esp-idf/components/fr
eertos/port.c:374

0x4008f0e5: _frxt_timer_int at C:/Projects/ESP32/TOOLS/esp-idf/components/freert
os/portasm.S:303

0x400825f2: _xt_lowint1 at C:/Projects/ESP32/TOOLS/esp-idf/components/freertos/x
tensa_vectors.S:1105

0x400838e6: spi_flash_op_block_func at C:/Projects/ESP32/TOOLS/esp-idf/component
s/spi_flash/cache_utils.c:81


Rebooting...

FreeRTOS ticks callback

Code: Select all

static void callback_tick_task(void)
{
    custom_tick_inc(portTICK_RATE_MS);
}

Task that uses this callback

Code: Select all

void my_1_task(void* arg)
{
    . . . 
    esp_register_freertos_tick_hook(callback_tick_task);
  
    while(1)
    {
       vTaskDelay(1);
       task_1_handler();
    }
}

Task that reads text files from spiffs image

Code: Select all

void my_2_task (void *arg)
{
    uint32_t cnt = 0;

    while(1)
    {
        cnt++;

        if(cnt > 2) // each 2 seconds switch file
        {
            load_file_from_spiffs(my_files[file_id]);

            file_id++;
            
            cnt = 0;
            
            //just a loop for loading files
            if(file_id >=  4)  file_id = 0;
            
        }
        vTaskDelay(1000);
    }
}

Also I have read this article:

https://docs.espressif.com/projects/esp ... n-accessed

Looks like reason of crash is because task_2 (reading file) disables others tasks until flash operations are in progress.
But I'm not sure where and how apply recommended attribute ESP_INTR_FLAG_IRAM (I suppose I have apply it to callback_tick_task function?).

Posted: **Tue Dec 25, 2018 1:19 am**

This is correct, callback_tick_task, custom_tick_inc and other functions called from the tick hook need to be placed into IRAM using IRAM_ATTR attribute (declared in esp_attr.h).

Posted: **Tue Dec 25, 2018 12:47 pm**

ESP_igrr, thanks a lot !

I tried apply IRAM_ATTR only for callback itself, but no success.

Now I added this attibutes to all functions in this callback aswell and it works fine

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