RE: Scheduler

Jared — Thu, 26 Nov 2020 10:10:41 GMT

Hi,

Could you check what is returned by both nrf_atfifo_alloc_put() and nrf_atfifo_get_free()?

regards

Jared

RE: Scheduler

genzy9 — Tue, 24 Nov 2020 12:41:43 GMT

OK thank you, we will plan to migrate to this driver for next release.

In the meantime could you help me with this issue:

In the uart handler, when I reaceive a buffer, I want to push it to a atfifo.

A timer handler will get data from this fifo and will send it to the tablet. Here's my current implementation:

typedef struct{
    uint8_t au8_uart_to_ble_tx_buffer[UART_TX_BUF_SIZE]; 
}tStreamingData;

static tStreamingData gStreamingData = {0};

NRF_ATFIFO_DEF(sd_fifo, tStreamingData, 5);

static void uart_event_handle(app_uart_evt_t *p_event)
{
    static uint16_t index = 0;
    static uint8_t au8_rx_buffer[UART_RX_BUF_SIZE] = {0};            // Buffer reception for UART
    static size_t frameCounter = 0;
    uint8_t u8_rxbyte;
    
    switch (p_event->evt_type)
    {
        case APP_UART_DATA_READY:
            UNUSED_VARIABLE(app_uart_get(&u8_rxbyte));    
            au8_rx_buffer[index] = u8_rxbyte;
            index++;
            if (u8_rxbyte == '\n')
            {
                
                //check if stream header is present  
                if (index > 5 && au8_rx_buffer[index-5] == 0x65 && au8_rx_buffer[index-4] == 0x6E && au8_rx_buffer[index-3] == 0x64 && au8_rx_buffer[index-2] == 0x0A && au8_rx_buffer[index-1] == 0x00)    //stream starts when end\n is encontered
                {
                    frameCounter++;
        
                    memcpy(gStreamingData.au8_uart_to_ble_tx_buffer , au8_rx_buffer, UART_TX_BUF_SIZE);
                    nrf_atfifo_alloc_put(sd_fifo, &gStreamingData, sizeof(tStreamingData), NULL);

                    index = 0;
                }

                if(index > UART_RX_BUF_SIZE)
                {
                    index = 0;
                }
            }
        break;
        case APP_UART_TX_EMPTY:
        break; 
        case APP_UART_FIFO_ERROR:
        break;
        case APP_UART_COMMUNICATION_ERROR:
        break;       
        default:
        break;
    }
}

And in a timer handler I am just polling the fifo

tStreamingData localSd;

nrf_atfifo_get_free(sd_fifo, &localSd, sizeof(tStreamingData), NULL);

But the fifo seems always empty.

I can not use logs since the code is embedded on a chip.

The atfifio has been definied globally using NRF_ATFIFO_DEF(sd_fifo, tStreamingData, 5);

and initialized in main using NRF_ATFIFO_INIT(sd_fifo);

I know for sure the data in the uart handler is correct since I detect a packet header sent by another module so the data are not 0 it is jsut somehow I failed pushing/poping the fata from the fifo but I dont know why.

Thanks

RE: Scheduler

Jared — Tue, 24 Nov 2020 06:38:47 GMT

Hi,

In short, the libUARTE is a good driver to use for when you have to receive lots of data through UARTE. Features such as the usage of double buffering, events for synchronization, usage of PPI to connect events, and the option of hw flow control minimizes lost data.

regards

Jared

RE: Scheduler

genzy9 — Mon, 23 Nov 2020 10:18:30 GMT

Hello Jared, thank you for your feedback.

How libuarte could help?

Btw I just noticed UARTE and UART are enabled. So I will investigate which one is used.

RE: Scheduler

Jared — Fri, 20 Nov 2020 12:29:35 GMT

Hi,

[quote user=""]I am afraid that the fifo will be full pretty quick so maybe thats not the best design.[/quote]

Yes, this is also what I'm thinking. I think the LibUARTE library would be better fit for your project. You find the example described here.

regards

Jared