RE: How can I use AT COMMAND via UART on nRF52840?

zester926 — Tue, 19 Nov 2019 11:27:58 GMT

Thank you Eugene Yu!! I forgot that the size of int pointer is 4byte kk,,,, Thanks a lot!!!

RE: How can I use AT COMMAND via UART on nRF52840?

Eugene Yu — Mon, 18 Nov 2019 23:50:43 GMT

Hi Zester926,

Getting the size of data is wrong in the lm5_send().

data_len = sizeof(data);

You cannot get the length of array with this correctly. It will just return 4bytes pointer size.

Try to change your code as below or other way to get the size correctly.

void lm5_send(uint8_t * data, uint16_t size)
{
    ret_code_t ret_val;
    
    for (uint32_t i = 0; i < size; i++)
    {
        do
        {
            ret_val = app_uart_put(data[i]);
            if ((ret_val != NRF_SUCCESS) && (ret_val != NRF_ERROR_BUSY))
            {
                NRF_LOG_ERROR("app_uart_put failed for index 0x%04x.", i);
                APP_ERROR_CHECK(ret_val);
            }
        } while (ret_val == NRF_ERROR_BUSY);
    }
//    if (data[data_len-1] == '\r')
//    {
//        while (app_uart_put('\n') == NRF_ERROR_BUSY);
//    }
}

int main(void)
{
    bool erase_bonds;
    uint8_t send_data[] = {'A','T','I','\r','\n'};
    lm5_send(send_data,sizeof(send_data));
}