UARTE

RE: UARTE

Elbert — Mon, 21 Nov 2022 08:13:15 GMT

Thanks for the example.

I'm already working on another example with standard uart Zephyr functions, but I will take a look after this one as well.

Best regards, Elbert

RE: UARTE

Hakon — Fri, 18 Nov 2022 11:14:35 GMT

FYI, there are some samples that use the nrfx directly that you can look at. You can find them here https://github.com/zephyrproject-rtos/hal_nordic/blob/master/nrfx/samples/src/nrfx_uarte/rx_double_buffered/main.c

RE: UARTE

Hakon — Fri, 11 Nov 2022 16:11:00 GMT

The maximum baudrate that has been tested is 1M, but it might work with a higher baudrate as well.

RE: UARTE

Elbert — Thu, 10 Nov 2022 15:08:01 GMT

What is the maximum UARTE baudrate on the nRF9160-dk that works reliable?

Are there any known issues running on high baudrate?

RE: UARTE

Elbert — Mon, 07 Nov 2022 15:12:46 GMT

He will be back next week, so let's wait for his answer.

RE: UARTE

Elbert — Mon, 07 Nov 2022 15:09:40 GMT

[quote userid="73166" url="~/f/nordic-q-a/91772/uarte/394415"]For nRF9160, UART always runs with EasyDMA. There is no "UART" peripheral, just UARTE as can be seen in the list.[/quote]

Thanks for the answer, this means that I can continue with the standard uart functions.

RE: UARTE

Hakon — Mon, 07 Nov 2022 12:45:21 GMT

[quote user="Elbert"]I have been told by Frans Lutz, FAE at Nordic Netherlands.[/quote]

He seems to be out of office at the moment, but he is back in four days, so hopefully I will get him to comment on this.

RE: UARTE

Hakon — Mon, 07 Nov 2022 12:43:07 GMT

[quote user="Elbert"]How can I verify the uart is running in UARTE mode? Is there any configuration or pin state I can check?[/quote]

For nRF9160, UART always runs with EasyDMA. There is no "UART" peripheral, just UARTE as can be seen in the list.

RE: UARTE

Elbert — Thu, 03 Nov 2022 15:51:54 GMT

[quote userid="73166" url="~/f/nordic-q-a/91772/uarte/393957"]Where have you been told this? As far as I know there is one internal example that is outdated and deprecated, and there is an official LP-UART sample. I don't think there is a specific UARTE sample, but I could be wrong[/quote]

I have been told by Frans Lutz, FAE at Nordic Netherlands.

[quote userid="73166" url="~/f/nordic-q-a/91772/uarte/393957"]Yes it should be possible. I'm pretty sure you can use the same API for both UART and UARTE.[/quote]

If this is real, than I can use the standard uart functions. Can your verify this at Nordic?

How can I verify the uart is running in UARTE mode? Is there any configuration or pin state I can check?

RE: UARTE

Hakon — Thu, 03 Nov 2022 14:44:06 GMT

[quote user="Elbert"]I have been told that there is a nRF9160-dk UARTE sample. Is it possible to provide this sample to me?[/quote]

Where have you been told this? As far as I know there is one internal example that is outdated and deprecated, and there is an official LP-UART sample. I don't think there is a specific UARTE sample, but I could be wrong.

[quote user="Elbert"]Can I use standard uart functions (like uart_callback_set, uart_rx_enable, etc.) and run in UARTE mode or do I have to use the uarte functions (like nrfx_uarte_init, nrfx_uarte_tx, etc.) to run in UARTE mode?[/quote]

Yes it should be possible. I'm pretty sure you can use the same API for both UART and UARTE.

RE: UARTE

Elbert — Wed, 02 Nov 2022 14:57:58 GMT

Hi Hakon,

The code shown at 26 Sep 2022 is exactly what I'm doing. There is not much more to show you.

Perhaps you can take a look at my questions of 26 Oct 2022. If these questions are answer it might not be necessary to use specific nrfx functions?

I have been told that there is a nRF9160-dk UARTE sample. Is it possible to provide this sample to me?

Best regards, Elbert

RE: UARTE

Hakon — Wed, 02 Nov 2022 10:04:01 GMT

Can you just show me the full main.c file? It's difficult to tell what's going on with the short bits of the code you have shown me.

RE: UARTE

Elbert — Tue, 01 Nov 2022 15:29:48 GMT

Is there any update on this item?

RE: UARTE

Elbert — Wed, 26 Oct 2022 09:02:27 GMT

Hi,

This setting was already present. From compiled devicetree output:

uart0: uart@8000 {
                                compatible = "nordic,nrf-uarte";
                                reg = <0x8000 0x1000>;
                                interrupts = <8 NRF_DEFAULT_IRQ_PRIORITY>;
                                status = "okay";
                                current-speed = <9600>;
                                pinctrl-0 = <&uart0_default>;
                                pinctrl-1 = <&uart0_sleep>;
                                pinctrl-names = "default", "sleep";
                        };

prj.conf contains CONFIG_UART_ASYNC_API=y and output file .config show:

CONFIG_UART_ASYNC_API=y

CONFIG_UART_0_NRF_UARTE=y

CONFIG_NRF_UARTE_PERIPHERAL=y

Does this mean uart0 is running in UARTE mode?
Can I use standard uart functions (like uart_callback_set, uart_rx_enable, etc.) and run in UARTE mode or do I have to use the uarte functions (like nrfx_uarte_init, nrfx_uarte_tx, etc.) to run in UARTE mode?

Best regard, Elbert

RE: UARTE

Hakon — Wed, 26 Oct 2022 08:40:52 GMT

Try setting "compatible = nordic,nrf-uarte" for uart0.

RE: UARTE

Elbert — Tue, 18 Oct 2022 14:51:01 GMT

This is the used overlay file:

/*
 * Copyright (c) 2021 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */

/* Disable uart1 in nonsecure since it is used by the TFM secure app. */
&uart1 {
	status = "disabled";
};

/* Console uart0 baudrate 9600 */
&uart0 {
    current-speed = < 9600 >;
};

/ {
    aliases {
        console-uart = &uart0;
    };
};

RE: UARTE

Hakon — Tue, 18 Oct 2022 11:30:02 GMT

Can you show the overlay file?

RE: UARTE

Elbert — Wed, 12 Oct 2022 14:07:08 GMT

prj.conf contains the configuration option CONFIG_UART_ASYNC_API=y.

This option is also present in the .config output file after pristine build. Other options in the .config are CONFIG_UART_0_NRF_UARTE=y and CONFIG_NRF_UARTE_PERIPHERAL=y.

Does this mean that it is NOT necessary to use prj.conf CONFIG_NRFX_UARTE0=y to enable UARTE mode?

If so, can I use the standard functions (to set up the callback routine and enable the uart rx) and be in UARTE mode?

How can I verify running in UARTE mode?

RE: UARTE

Elbert — Wed, 12 Oct 2022 08:53:21 GMT

Changing interrupt priority (default 7) does not help. UART event handler (callback) is never hit.

The LOG_DBG statements in the callback are not executed and the global variable the event type is stored never changes. Is it possible to use log statements in UARTE event handler?

Is there a working nRF9160 UARTE sample?

Any other suggestions?

RE: UARTE

Elbert — Mon, 10 Oct 2022 08:22:32 GMT

Sorry, answer at wrong place, hope it is ok now.

Hi nRF5FanBoy,

The uarte configuration as you mention is in my config file the same.

I have added the configuration of the pins, hardware flow control and parity now. Also added the nrfx_uarte_rx and nrf_uarte_enable (after nrfx_uarte_init ), but without any result. The rx and first tx return success, but the callback is never hit and next tx shows busy.

It looks like it has something to do with the callback, but how can I figure out what goes wrong?

Best regards, Elbert

RE: UARTE

Elbert — Mon, 10 Oct 2022 08:17:38 GMT

Hi nRF5FanBoy,

The uarte configuration as you mention is in my config file the same.

It looks like it has something to do with the callback, but how can I figure out what goes wrong?

Best regards, Elbert

RE: UARTE

nRF5xFanboy — Fri, 07 Oct 2022 19:30:24 GMT

Hi Elbert,

Are uart(e) related things enabled in the config file?

// nrfx_config.h
#define NRFX_UARTE_ENABLED 1
#define NRFX_UARTE0_ENABLED 1

Can you please present your config file here to analyse uart stuff is enabled.

I don't see the interrupt being set nor the handler?
I don't see the flow control being enabled/disabled

My uart c++ class has this inside:

/** Setup the pins. */
uarte_modem_config.pseltxd = tx_pin;
uarte_modem_config.pselrxd = rx_pin;
uarte_modem_config.pselcts = NRF_UARTE_PSEL_DISCONNECTED;
uarte_modem_config.pselrts = NRF_UARTE_PSEL_DISCONNECTED;
uarte_modem_config.baudrate = IntegerToBadurate ( baudrate );
uarte_modem_config.hwfc = NRF_UARTE_HWFC_DISABLED;
uarte_modem_config.parity = NRF_UARTE_PARITY_EXCLUDED;
uarte_modem_config.interrupt_priority = 2; ///< TODO Make configurable.
uarte_modem_config.p_context = this;

assert ( uarte_modem_config.baudrate != -1 );
nrfx_uarte_init ( &uarte_drv_, &uarte_modem_config, &Uart::uartEventHandler );
nrfx_uarte_rx ( &uarte_drv_, NextRxBuffer (), 1 );
nrf_uarte_enable ( uarte_drv_.p_reg );

Best regards,
nRF5FanBoy

RE: UARTE

Elbert — Thu, 06 Oct 2022 13:00:05 GMT

Update on code (see earlier post) run:

nrfx_uarte_init log result:

<wrn> NRFX_UARTE: Function: nrfx_uarte_init, error code: NRFX_SUCCESS.

nrfx_uarte_tx log result:

<inf> NRFX_UARTE: Transfer tx_len: 40.

<inf> NRFX_UARTE: Function: nrfx_uarte_tx, error code: NRFX_SUCCESS.

Data is transmitted OK.

The next statement in the debugger is not executed, a manual break in the debugger shows running in function uarte_nrfx_isr_int, uarte_handler is never addressed.

NRFX_UARTE_DEFAULT_CONFIG() with nRF9160-dk pin configuration instead of NRF_UARTE_PSEL_DISCONNECTED does not give another result.

Any idea what might be the reason? Configuration issue?

RE: UARTE

Elbert — Wed, 05 Oct 2022 08:22:34 GMT

Logging was enabled and both nrfx_uarte_init() and nrfx_uarte_tx() show NRFX_SUCCESS. The problem is that the uarte_handler() is never hit and function call nrfx_uarte_tx_in_progress() hangs.

With nrf9160-dk and standard uart0 implementation (UART API) transmit and receive data works, so I expect UARTE should also work at uart0.

Is there a working UARTE example on nrf9160-dk available?

RE: UARTE

Hakon — Tue, 04 Oct 2022 15:18:07 GMT

Did you disable logging? Maybe you can try a different uart instance.