UART issue after BOOTLOADER JUMP

[Abhishek]

we wrote a small application to jump to a desired address of our application from bootloader , but UART does not seem to work(i cannot see any transmitted values on terminal) once the application is started by the bootloader ,

is it something to do with transferring the vector table from bootloader to main application?

[bjorn-spockeli]

Make sure that you, uninitialize the UART peripheral using app_uart_close() before you call nrf_bootloader_app_start, see below, which will enable the SoftDevice and forward interrupts to the application.

void nrf_bootloader_app_start(uint32_t start_addr)
{
    NRF_LOG_INFO("Running nrf_bootloader_app_start with address: 0x%08x\r\n", start_addr);

#if defined(BLE_STACK_SUPPORT_REQD))
    uint32_t err_code;

    //NRF_LOG_INFO("Initializing SD in mbr\r\n");
    err_code = nrf_dfu_mbr_init_sd();
    if(err_code != NRF_SUCCESS)
    {
        NRF_LOG_INFO("Failed running nrf_dfu_mbr_init_sd\r\n");
        return;
    }

#endif

    // Disable interrupts
    NRF_LOG_INFO("Disabling interrupts\r\n");

    NVIC->ICER[0]=0xFFFFFFFF;
#if defined(__NRF_NVIC_ISER_COUNT) && __NRF_NVIC_ISER_COUNT == 2
    NVIC->ICER[1]=0xFFFFFFFF;
#endif

#if defined(BLE_STACK_SUPPORT_REQD))
    // Set the sd softdevice vector table base address
    NRF_LOG_INFO("Setting SD vector table base: 0x%08x\r\n", start_addr);
    err_code = sd_softdevice_vector_table_base_set(start_addr);
    if(err_code != NRF_SUCCESS)
    {
        NRF_LOG_INFO("Failed running sd_softdevice_vector_table_base_set\r\n");
        return;
    }
#endif

    // Run application
    nrf_bootloader_app_start_impl(start_addr);
}

[bjorn-spockeli]

Ok, let me know how it goes.