UARTE multiple instance with new nrfx exam

[JYL]

Hello,

I would like to use the two UARTEs available on nRF52840 with external asynchronous chips.

I've started a new development with the last sdk (15.3.0) and would like to know if there is a clear example on how to initialize the peripherals.

I'd like to use the UARTES on interrupt but I can't figure out how to use the new nrfx drivers.

Best regards,

JY

[ovrebekk]

Hi Jean-Yves

Have you taken a look at the new nrf_serial driver in nRF5 SDK v15.3.0?

It is well suited for asynchronous UART devices, and will use the nrfx_uarte driver under the hood. 

There is an example for this driver in the examples/peripheral/serial folder in the SDK. 

While this example only uses a single UART, you should be able to register two instances of the driver as long as you enable the required peripherals in the sdk_config.h file. 

Best regards
Torbjørn

[JYL]

Hi,

thank you for your answer.

Yes, I had more than a look on the examples you mentionned but I'm turning arround.

Shall I inspire myself from app_uart_fifo.c and rewrite it to be multi Uart ?

During my tests, I discovered that the exmaple works the same whatever I configure in sdk_config.h.

i.e:

// <e> NRFX_UARTE_ENABLED - nrfx_uarte - UARTE peripheral driver
//==========================================================
#ifndef NRFX_UARTE_ENABLED
#define NRFX_UARTE_ENABLED 0
#endif
// <o> NRFX_UARTE0_ENABLED - Enable UARTE0 instance 
#ifndef NRFX_UARTE0_ENABLED
#define NRFX_UARTE0_ENABLED 0
#endif

// <o> NRFX_UARTE1_ENABLED - Enable UARTE1 instance 
#ifndef NRFX_UARTE1_ENABLED
#define NRFX_UARTE1_ENABLED 0
#endif

// <e> NRFX_UART_ENABLED - nrfx_uart - UART peripheral driver
//==========================================================
#ifndef NRFX_UART_ENABLED
#define NRFX_UART_ENABLED 0
#endif
// <o> NRFX_UART0_ENABLED - Enable UART0 instance 
#ifndef NRFX_UART0_ENABLED
#define NRFX_UART0_ENABLED 0
#endif

this shall disable all UART functions no ?

JY

[JYL]

Hi,

I just realized I work with uart example and not serial example. Sorry for the mistake.

In this example, modifications in sdk_config.h still doesn't seem's to have any effect on the software behavior.

Regards,

JY

[ovrebekk]

Hi Jean-Yves

The reason for this is that the SDK has a 'legacy' layer, that converts the old pre-NRFX defines to the new NRFX defines. 

In the case of the UART this is the UART0_ENABLED and UART1_ENABLED define that you can also find in sdk_config.h

If you disable UART0_ENABLED it should cause a build error, and if you enabled UART1_ENABLED you should be able to use both of the UART's. 

Best regards
Torbjørn