NRF58232/SDK15 Where can I find sample code to use NRFX_UARTE ?

[MPS]

Hi,

I'm looking for an example of how NRFX_UARTE works.

I would like to set up a serial port with EasyDMA to send and receive a thirty bytes.

Thanks in advance for your help.

Best regards, 

[awneil]

Do you mean the Nordic UART Service - NUS?

The examples appear under the SDK in the Infocenter; eg, 

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/examples_ble.html - Central

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/examples_ble.html - Peripheral

[MPS]

Hi awneil,

Thanks for your answer but I don't want send and receive bytes by BLE, just with serial port. 

I need to use UARTE, not BLE Service NUS.

[awneil]

Ah - OK.

So look in the SDK documentaion:

infocenter.nordicsemi.com/.../sdk.html

eg,

Software Development Kit > nRF5 SDK > nRF5 SDK v15.0.0 > Hardware Drivers

Software Development Kit > nRF5 SDK > nRF5 SDK v15.0.0 > Examples > Hardware peripheral examples

Also refer to the device datasheet.

[MPS]

Thanks, but there isn't example for UARTE, just for UART.

I didn't find example code for UARTE with new NRFX_UARTE and I'm lost ...

[Håkon Alseth]

The "uart" example in the SDK uses UARTE0 (and therefore DMA) by default.

If you are looking for a more direct way of calling nrfx_uarte_init, you could have a look at the small wrapper in nrf_drv_uart.h.

 

Cheers,

Håkon

[MPS]

Hi Häkon,

Thanks for your answer.

I'm sorry but I'm always lost. We have lots of files (app_uart, nrf_uarte,nrfx_uarte, ...)

I need to be closer to the nRF52832 datasheet to manage all I want.

In this example, how to enable or disable events for uart_error_handle ? I don't want to systematically go into the handler at every byte received, otherwise eDMA is useless ...

Many thanks for your help, I'm not sure I'm very clear.

Best regards,

[Håkon Alseth]

In your case, I recommend that you omit the app_uart libraries, and use nrf_drv_uart.h (which wraps around calls to nrfx_) directly, by using the functions nrf_drv_uart_rx(...) and nrf_drv_uart_tx(...). The nrf_cli and our serializers use this directly (and app_uart as well, just that it sends/receives only 1 byte at the time).

 

Best regards,

Håkon

.

[MPS]

I don't understand how to get all the interruption that I wish as an event in the handler.

For example, how to be informed of RXSTARTED for load another buffer as seen in Figure 95 of the nRF52832 datasheet.

If I use another way of doing this, for example :

    NRF_UARTE0->ENABLE = (UARTE_ENABLE_ENABLE_Enabled << UARTE_ENABLE_ENABLE_Pos);
    NRF_UARTE0->BAUDRATE=NRF_UARTE_BAUDRATE_115200;
    NRF_UARTE0->PSEL.RXD=RX_PIN_NUMBER;
    NRF_UARTE0->PSEL.TXD=TX_PIN_NUMBER;
    NRF_UARTE0->CONFIG=NRF_UARTE_HWFC_DISABLED;
 
    NRF_UARTE0->TXD.PTR = (uint32_t)((uint8_t *)txUarteBuffer);
    NRF_UARTE0->TXD.MAXCNT = sizeof(txUarteBuffer);
    NRF_UARTE0->TASKS_STARTTX = 0;

    NRF_UARTE0->RXD.PTR = (uint32_t)((uint8_t *) rxUarteBuffer);
    NRF_UARTE0->RXD.MAXCNT = sizeof(rxUarteBuffer);
    NRF_UARTE0->TASKS_STARTRX = 1;

How to create an handler for event ?

if I use : 

    NRF_UARTE0->INTENCLR = 0xFFFFFFFF;
    NRF_UARTE0->INTENSET = NRF_UARTE_INT_ENDRX_MASK;
    NVIC_ClearPendingIRQ(UARTE0_UART0_IRQn);
    NVIC_SetPriority(UARTE0_UART0_IRQn, NRFX_UARTE_DEFAULT_CONFIG_IRQ_PRIORITY);
    NVIC_EnableIRQ(UARTE0_UART0_IRQn);

I have : 

<error> app: ERROR 3735928559 [Unknown error code] at .......\modules\nrfx\drivers\src\prs\nrfx_prs.c:81

PC at: 0x0002C49F

<error> app: End of error report

Someone can help me ?

Thanks in advance.

Best regards,

[Håkon Alseth]

Hi,

 

It looks like you are mixing bare metal implementation, and using the nrfx_uarte driver. You must disable the nrfx_uarte module in order to use the UARTE peripheral directly.

 

Best regards,

Håkon