TTL HMI to NRF52840

RE: TTL HMI to NRF52840

JONATHAN LL — Fri, 08 Nov 2024 07:14:14 GMT

[quote user="MontanaEE"]What is the best way to receive this in? I'm thinking of bringing it in as a string, but I need to send and receive in the same format. [/quote]

You just have to select one, not sure if one is better then the other, hex or string will both work.

Regards,
Jonathan

RE: TTL HMI to NRF52840

MontanaEE — Wed, 06 Nov 2024 19:22:22 GMT

Hey Jonathan,

I have this setup for the two wire TX/RX on my display to connect to the nrf52840.

uart0_default_alt: uart0_default_alt {

phandle = < 0x2 >;

group1 {

psels = < 0x6 >, < 0x10008 >;

};

uart0_sleep_alt: uart0_sleep_alt {

phandle = < 0x3 >;

group1 {

psels = < 0x6 >, < 0x10008 >;

low-power-enable;

};

I do know what the signal looks like with the o'scope now. What is the best way to receive this in? I'm thinking of bringing it in as a string, but I need to send and receive in the same format. Below is the signal I receive for a single touchscreen press. Each button is it's own unique number always ending in FF FF FF.

Stephen

RE: TTL HMI to NRF52840

JONATHAN LL — Tue, 05 Dec 2023 14:15:25 GMT

Both the Analog Discovery and Saleae works well as logic analyzers but I do see that there are some makeshift Arduino options like this https://www.hackster.io/vincenzo-g/diy-logic-analyzer-f61ee5 that doesn't brake the bank.

Whatever you end up using should help with further debugging.

Regards,
Jonathan

RE: TTL HMI to NRF52840

MontanaEE — Tue, 28 Nov 2023 04:59:42 GMT

Thank you. I will see what I can find for an LA. I have everything connected as it should be then.

RE: TTL HMI to NRF52840

Sigurd — Mon, 27 Nov 2023 09:15:19 GMT

Hi,

Jonathan is out of office, so I'm replying instead.

[quote user="MontanaEE"]Am I correct that for the 3.3V TTL Serial, I would connect to the UART TX and RX? [/quote]

Correct.

[quote user="MontanaEE"] If so, I was trying to find out how to view the data so I can debug the HMI.[/quote]

Personally, I prefer saleae logic analyzer, but there are other options on the marked as well.

RE: TTL HMI to NRF52840

MontanaEE — Fri, 17 Nov 2023 17:51:22 GMT

Jonathan,

Thank you for the response. Yes, I do have an o'scope. The board I am using is the Laird Pinnacle 100 DVK. It has a UART port that I can access the TX/RX pins on. Am I correct that for the 3.3V TTL Serial, I would connect to the UART TX and RX? If so, I was trying to find out how to view the data so I can debug the HMI.

Thanks,

Stephen

RE: TTL HMI to NRF52840

JONATHAN LL — Tue, 14 Nov 2023 13:36:47 GMT

[quote user="MontanaEE"]Is there a way to monitor the other UART port to see what is coming through besides just getting the echo back on the port? [/quote]

Do you have a logic analyzer or a Oscilloscope that you can probe the lines with to see what is happening on the line?

TP 13 and TP 14 is USB lines test points.

Regards,
Jonathan

RE: TTL HMI to NRF52840

MontanaEE — Wed, 01 Nov 2023 00:55:18 GMT

The SDK version I have is 2.5.0

RE: TTL HMI to NRF52840

MontanaEE — Tue, 31 Oct 2023 18:35:54 GMT

I am using the Laird Connectivity Pinnacle 100 DVK. https://docs.zephyrproject.org/latest/boards/arm/pinnacle_100_dvk/doc/index.html

This DVK uses Zephyr RTOS. I am a first time Zephyr user so picking that up as I work through this.

I have a UART available on the DVK, but I do not see the data from the touchscreen coming in on the port. I can connect the same touchscreen to a TTL to USB converter and see the touchpoint ID's come through on TeraTerm with no issue, so I know that is functioning. There is a direct USB port to the NRF52840 on the DVK. Is there a way to monitor the other UART port to see what is coming through besides just getting the echo back on the port? This is a 3.3V TTL signal which should be compatible with the UART I believe.

RE: TTL HMI to NRF52840

JONATHAN LL — Mon, 30 Oct 2023 14:43:54 GMT

Hi,

Can you share some more about the setup\issue?

What SDK are you using?

We do have some uart and usb examples.

nRF5SDK
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/uart_example.html?cp=9_1_4_6_48

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/examples_usb.html?cp=9_1_4_6_50

NCS
https://github.com/nrfconnect/sdk-nrf/tree/87bdbc783a5eed1b02685f45075311215bfc1de3/samples/peripheral/lpuart

Regards,
Jonathan