Serial library event handler example

RE: Serial library event handler example

Igor — Mon, 03 Sep 2018 15:22:09 GMT

This works in SDK 15:

static void serial_rx_cb(struct nrf_serial_s const *p_serial, nrf_serial_event_t event) {
    if (event == NRF_SERIAL_EVENT_RX_DATA) {
        char c;
        APP_ERROR_CHECK(nrf_serial_read(&serial_uart, &c, sizeof(c), NULL, 500));
        APP_ERROR_CHECK(nrf_serial_write(&serial_uart, &c, sizeof(c), NULL, 500));
        //__LOG(LOG_SRC_APP, LOG_LEVEL_INFO, "%c\n", c);
    }
}

But it is still char by char. I don't know how to use it properly with a bigger SERIAL_BUFF_RX_SIZE?

RE: Serial library event handler example

Jørgen Holmefjord — Mon, 28 May 2018 08:10:57 GMT

You are correct, how often the event handler is called depends on the size of the buffers set using NRF_SERIAL_BUFFERS_DEF. These buffers are used for transfers, and the size will determine the smallest slices of data that can be transfered in a single UART driver - legacy layer driver request. Increasing the buffer size should give you fever calls of the handler.

RE: Serial library event handler example

aaronxu — Sat, 26 May 2018 14:37:14 GMT

I am afraid that the event handler will be called on every single byte received by the UART. No matter the "nrf_serial_read" parameters.

Could you kindly share with us an example use event handler for receive more than one byte?

RE: Serial library event handler example

Jørgen Holmefjord — Mon, 13 Nov 2017 14:09:36 GMT

The event handler will be called on every NRF_DRV_UART_EVT_RX_DONE event from the UART driver. This will either happen when the number of bytes passed to the size parameter of nrf_serial_read() have been received, or when the timeout have been reached.

RE: Serial library event handler example

SRose — Mon, 06 Nov 2017 16:24:12 GMT

Jørgen, Does the event handler set in NRF_SERIAL_CONFIG_DEF get called for EACH byte received by the UART, or does it get called once after __?__ From the previous post, should I read the entire queue until empty? or just one byte off the queue like the example?

RE: Serial library event handler example

SRose — Fri, 03 Nov 2017 15:12:31 GMT

The byte data coming in is a proprietary protocol. I need to store the data in a big buffer and search for the start / end bytes for each message and then parse the message. I do have a timing requirement. Once I receive the end byte for a given message, the program needs to respond by sending a msg on the serial within 300us - 6.0ms. It seems to me using the event handler is better for this than always querying the serial queue with a timer?

RE: Serial library event handler example

Jørgen Holmefjord — Fri, 03 Nov 2017 14:33:44 GMT

You should only have to define the event handler and pass this to NRF_SERIAL_CONFIG_DEF. What exactly do you want the handler to do?