OTA on ESP32-WROVER Module

[llewellyn]

While performing an OTA update on ESP32-WROVER module does the data for OTA need to be in internal RAM?

[ESP_Sprite]

Not entirely; you can 'stream' an OTA. (Essentially read a few K, write a few K to flash, read a few K, etc.)

[WiFive]

But the buffer needs to be in internal ram since cache will be disabled during flash write, right?

[llewellyn]

But the buffer needs to be in internal ram since cache will be disabled during flash write, right?

That's what I wanted to know . since the cache is disabled I need to have the buffer for OTA data to be on the internal ram.
How do allocate the buffer to internal RAM?

[kolban]

Howdy @llewellyn,
My understanding is that you can force a memory allocation into ESP32 internal RAM using:

void* heap_caps_malloc(size_t size, uint32_t caps)

for example:

Code: Select all

uint8_t* pMyRam = heap_caps_malloc(4*1024, MALLOC_CAP_DMA);

You can release the storage with either free() or heap_caps_free().

[f.h-f.s.]

or like the ota example:

Code: Select all

/*an ota data write buffer ready to write to the flash*/
static unsigned char ota_write_data[BUFFSIZE + 1] = {0};
/*an packet receive buffer*/
static unsigned char text[BUFFSIZE + 1] = {0};

As a array in global.