nrf52-mesh-light-switch-client-server-proxy-master add uart module

[Enzo]

HI

I use SDK nrf52-mesh-light-switch-client-server-proxy-master with nrf52840 PDK。

I need uart module，so I add include path，c file to the project.

add header file ， uart_init function and uart event handle dunction to main.c . 

set SDKconfig.h as uart example of SDK15.0.0 .

At beginning，it works fine. But when I send many data or send data Very frequently, it will stop running and show this error:

app_error_weak.c,  105, Mesh error 1 at 0x00000000 (:0)

after debug, i fuond that uart_event_handle function came a event of APP_UART_COMMUNICATION_ERROR.

[Enzo]

Hi

I got something new.

I tried to modify FIFO BUFFER SIZE RX and TX to a maximum of 2048. I found that if sent and received 5 bytes per 200 ms. There will be no mistakes. But more than 5 bytes will make a mistake.
In addition, I tried to modify the priority parameter in the function uart_init() to be high priority. There was no error every 200 ms when the test received and sent 20 bytes. The question now is whether changing priorities will have any other impact.

 APP_IRQ_PRIORITY_LOWEST-->APP_IRQ_PRIORITY_HIGH

[haakonsh]

I need you to define "a mistake",  I can not help you if I do not know the nature of your problem. 

One thing that might solve your problems is using the UARTE — Universal asynchronous receiver/transmitter with EasyDMA peripheral with the UARTE driver in non-blocking mode with DMA. That way your UART communication is almost completely independent from the CPU. 

[Enzo]

sorry for the later reply.

"a mistake" means the error APP_UART_COMMUNICATION_ERROR as same as this question.

my example used the uart with easyDMA but I don't know much about non-blocking

[haakonsh]

What is the value of data field of the app_uart event? From app_uart.h :

/**@brief Struct containing events from the UART module.
 *
 * @details The app_uart_evt_t is used to notify the application of asynchronous events when data
 * are received on the UART peripheral or in case an error occured during data reception.
 */
typedef struct
{
    app_uart_evt_type_t evt_type; /**< Type of event. */
    union
    {
        uint32_t error_communication; /**< Field used if evt_type is: APP_UART_COMMUNICATION_ERROR. This field contains the value in the ERRORSRC register for the UART peripheral. The UART_ERRORSRC_x defines from nrf5x_bitfields.h can be used to parse the error code. See also the \nRFXX Series Reference Manual for specification. */
        uint32_t error_code;          /**< Field used if evt_type is: NRF_ERROR_x. Additional status/error code if the error event type is APP_UART_FIFO_ERROR. This error code refer to errors defined in nrf_error.h. */
        uint8_t  value;               /**< Field used if evt_type is: NRF_ERROR_x. Additional status/error code if the error event type is APP_UART_FIFO_ERROR. This error code refer to errors defined in nrf_error.h. */
    } data;
} app_uart_evt_t;

Non-blocking means that you continue executing code when you wait for a state change instead of blocking execution: 

change_state();

while(!state_changed); // Blocking function 

do_stuff();

do_other_stuff(); // Blocked function

-------------------------- VS ----------------------------

change_state();
do_other_stuff(); // Not blocked


void some_event_handler(bool state_changed) 
{
    if(state_changed)
    {
        do_stuff();
    }
}