app_uart_put() dropping some packets of data on UART

RE: app_uart_put() dropping some packets of data on UART

kumar — Tue, 13 Feb 2018 19:31:19 GMT

Hello Kenneth,

Thankyou for your Reply! I found the problem. It lies somewhere else. I have ben using two timers with different timings to generate events on the same hardware pin. The second timer event seemed to disturb the first timer event, thereby distorting my UART tx channel on this common pin. I now have a single timer event for both the cases so that the timer is started at different instances of time.

Regards,

Kumar

RE: app_uart_put() dropping some packets of data on UART

Kenneth — Mon, 12 Feb 2018 13:31:29 GMT

Hi Kumar,

The easiest is to use the nrf UART driver directly, make sure to enable UART0_CONFIG_USE_EASY_DMA, and then each time you want to transmit data call nrf_drv_uart_tx(). If you have enabled a callback handler during nrf_drv_uart_init(), then you will get a event NRF_DRV_UART_EVT_TX_DONE when the transfer is done. In general you can find information about the driver here:

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v13.0.0/hardware_driver_uart.html?cp=4_0_4_2_18

The problem with the app_fifo_put is that it was made for the nRF51-series, it still works on the nRF52-series, but it doesn't relly make use of the new EasyDMA feature that came with the nRF52-series.

Best regards,
Kenneth

RE: app_uart_put() dropping some packets of data on UART

kumar — Sat, 10 Feb 2018 21:30:43 GMT

Hello! Even after setting the Baudrate Higher, the problem is not solved! But only one thing worked, and that is by adding a delay in front of app_fifo_put function. This is in my case, absolutely no solution because I cannot afford any delays in my UART transmissions.

Any Suggestions on this problem is greatly appreciated!

Thanks and regards,

Kumar