esp_partition_read function can only read 10 to 20 bytes

[akshar001]

I am trying to do some ota work in my project and needed to read the partition where ota has currently written the data.
i am using arduino 1.8.5 in mac os.
when i try to use function esp_partition_read at the last parameter as length of the data to be read when i put of more than 50 bytes esp32 restarts itself but it works fine for 10-20 bytes length.
I actually need 1024 bytes to read at same time.
'
uint8_t read_data[1025]
uint32_t ret = esp_partition_read(update, 0,
read_data,1024);
if(ret!= ESP_OK){
Serial.println("ERRRORRRR *****************");
break;
}
'

This is an decoded guru meditation error code.

Decoding 7 results
0x4008ec72: vPortYieldFromInt at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/freertos/portasm.S line 595
0x4008eb7b: _frxt_int_exit at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/freertos/portasm.S line 206
0x400e3b18: uartBegin at /Users/akshar/Documents/Arduino/hardware/espressif/esp32/cores/esp32/esp32-hal-uart.c line 368
0x4008eafc: _frxt_int_enter at /Users/ficeto/Desktop/ESP32/ESP32/esp-idf-public/components/freertos/portasm.S line 119
0x400e3b18: uartBegin at /Users/akshar/Documents/Arduino/hardware/espressif/esp32/cores/esp32/esp32-hal-uart.c line 368

[lbernstone]

The size needs to match the size assigned to your read_data buffer, which you do not show in your code. Also, the return value for esp_partition_read is an esp_err_t, not uint32_t.

[akshar001]

@lbernstone yes you are indeed very right about that but indirectly esp_err_t is just a typedef of uint32_t so it wouldn't be a problem. i have taken the enough data size to copy.

[lbernstone]

Looking at the definition (https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/storage/spi_flash.html#_CPPv218esp_partition_readPK15esp_partition_t6size_tPv6size_t), the buffer should be a void pointer. Try making it explicit:
esp_err_t ret = esp_partition_read(update, 0, (void*) read_data, 1024);
Please include the error along with the backtrace.

[akshar001]

@lbernstone i have already tried passing void pointer casting but it works like same, and it works very fine when size is 10 using this same code that i have poasted i can read whole partition when size is 10, i have tried it all it's esp32 side problem that's why i have posted the issue!

[lbernstone]

If you post a minimal sketch, I will take a look and see if I can help.

[akshar001]

I found the problem,
Though it's not en error of any kind but it's an error,
The actual program in which i was running the function was crashing,
But after that i tried minimal sketch and everything runs fine.
There were 3-4 freertos task running and ram would be very low though this shouldn't be done but it crashes at that time.