Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

RE: Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

Jørgen Holmefjord — Tue, 08 Jun 2021 10:41:27 GMT

Did you connect TX pin from nRF to RX pin of external MCU, and RX pin from nRF to TX pin of external MCU? Are you using the same UART configurations (baudrate, flow control, stop/parity bits, etc) on both sides?

RE: Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

windychicago — Sun, 16 May 2021 04:48:20 GMT

As a test, I changed P0.06 and P0.08 to P0.23 & P0.24, which were used for application sample code. But not work.

RE: Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

windychicago — Sat, 15 May 2021 15:55:03 GMT

I tried both UART and libUARTE samples that wired with RX P0.06 and TX P0.08 to another MCU, which are used for the debug console. Interesting thing is the data sent from another MCU received and appears to the terminal emulator PuTTY. Can UART to another MCU share the same PINS with debug console terminal emulator PuTTY?

RE: Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

Jørgen Holmefjord — Wed, 12 May 2021 11:48:02 GMT

The serialization solution shows how one board can control the softdevice/BLE stack on another device over a serial interface. This is used in applications where you have a one MCU for the application and another MCU running the radio protocol. If you only want to communicate between two devices over UART interface, there is no need to use serialization, then UART/libUARTE examples are better starting points.

RE: Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

windychicago — Tue, 11 May 2021 20:20:52 GMT

Hi Jorgen

I tried serialization solution examples you mentioned. Connected the two nRF52 development boards as in the instruction of serialization hardware uart. , which is very clear. Serialization software setup installation are easy to follow too. However, after install Heart Rate application on app board and serialized example project onto connectivity board, then I don't know what & where to look the logs or activity. I used RTT to connect to application board, and no RX/TX activities. I assume this example will show user how two boards can communicate each other via UART with PINS connected, right? Further info will be appreciated.

Thanks

Victor

RE: Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

Jørgen Holmefjord — Mon, 10 May 2021 07:44:24 GMT

The LIBUARTE example uses the default UART pin configurations from the board header file:

//From main.c

nrf_libuarte_async_config_t nrf_libuarte_async_config = {
        .tx_pin     = TX_PIN_NUMBER,
        .rx_pin     = RX_PIN_NUMBER,

//From pca10040.h

#define RX_PIN_NUMBER  8
#define TX_PIN_NUMBER  6

You can change the pin configurations directly in main.c, either by passing the GPIO numbers directly, or by defining new symbols.

The SER_APP_* defines are used by the serialization solution examples.

RE: Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

windychicago — Sat, 08 May 2021 02:31:11 GMT

I found following code in file pca10040.h

// serialization APPLICATION board - temp. setup for running serialized MEMU tests
#define SER_APP_RX_PIN 23 // UART RX pin number.
#define SER_APP_TX_PIN 24 // UART TX pin number.
#define SER_APP_CTS_PIN 2 // UART Clear To Send pin number.
#define SER_APP_RTS_PIN 25 // UART Request To Send pin number.

However, when I search the entire solution, no where uses it. Is there other place define them?

Thanks

RE: Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

windychicago — Fri, 07 May 2021 17:09:44 GMT

Hi Jorgen

I compiled & ran the Libuarte Example successfully. Will take your recommendation to use UARTE. Thanks.

Which file(s) contains the pin configuration? Any advice will be appreciated.

Thanks

Victor

RE: Sample UART code to use P0.17 and P0.19 that connects to a Microchip board (SAML10)

Jørgen Holmefjord — Fri, 07 May 2021 14:34:53 GMT

Hi,

There are multiple UART examples in the SDK, but none of these uses the UART driver directly.

You can chose from the following examples:

UART Example - uses app_uart library
Libuarte Example - Uses Libuarte - advanced UARTE driver library.

If you are planning to send/receiving large amounts of data, I would highly recommend that you use the last example/library.

The pin configuration can be set in the examples.

Best regards,
Jørgen