Chip: ESP32S3 IDF: 4.4 When calling uart_driver_install(UART_NUM_1, rx_buf, tx_buf, q_size, &queue, 0); The call fails with ESP_ERR_NOT_FOUND about 5% of the times. Hence the problem is not easily reproducible. I replaced the call with 3 different calls esp_err_t err = uart_driver_install(UART_NUM_1...

I am initializing and using a file static nvs handle for getting and setting variables. static nvs_handle xNvsHandle; void vInitNVS() { esp_err_t err = nvs_flash_init(); if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) { ESP_ERROR_CHECK(nvs_flash_erase()); ESP_ERROR_CHEC...

Thanks for the reply.
My question was specific to interrupts allocated using ESP_INTR_FLAG_IRAM.
So it seems like even other important functions such as memset or more importantly xQueueSendToBackFromISR cannot be used?
If yes, this does seem to limit the functionality of such ISRs quite a bit.

In one of the timer examples, the following is mentioned before an ISR definition: * Note: * We don't call the timer API here because they are not declared with IRAM_ATTR. * If we're okay with the timer irq not being serviced while SPI flash cache is disabled, * we can allocate this interrupt withou...