CC1312R: Contiki-NG: UART with binary mode

Koichiro Tashiro

Part Number: CC1312R

Hi,

I have a customer who is trying to use CC1312R with Contiki-NG.
Contiki-NG source codes are available here;
https://github.com/contiki-ng/contiki-ng

Customer wants to connect CC1312R as slave to host MCU using UART.
There is UART source code available in Contiki-NG.
C:\contiki-ng\arch\cpu\simplelink-cc13xx-cc26xx\dev\uart0-arch.c

Customer found if 0x00 is sent from host, CC1312R cannot receive the data.
No UART receive interrupt is generated.
It seems the default UART mode is “text mode”. 0x00 is treated as NULL with “text mode”, so probably this is the reason.
Now customer tried to change the mode to “binary mode”

void

uart0_init(void)

{

if(initialized) {

return;

}

// UART_Params uart_params;

UART_Params_init(&uart_params);

uart_params.baudRate = TI_UART_CONF_BAUD_RATE;

uart_params.readMode = UART_MODE_CALLBACK;

uart_params.writeMode = UART_MODE_BLOCKING;

uart_params.readCallback = uart0_cb;

uart_params.readDataMode = UART_DATA_BINARY;

uart_params.readReturnMode = UART_RETURN_FULL;

uart_params.readEcho = UART_ECHO_OFF;

uart_params.readTimeout = 5000;

// uart_params.readDataMode = UART_DATA_TEXT;

// uart_params.readReturnMode = UART_RETURN_NEWLINE;

/* No error handling. */

uart_handle = UART_open(Board_UART0, &uart_params);

initialized = true;

}

But it did not work.
Customer confirmed the mode (“readDataMode” parameter) was correctly changed.
(see attached CCS window snapshots)

What else needs to be done for UART binary mode?

Thanks and regards,
KoT

over 6 years ago

0 Koichiro Tashiro over 6 years ago

TI__Mastermind 22935 points

I just wants to rephrase the question.
The goal is receiving 0x00 data from UART, not just using UART in binary mode.

Q) Please let me know how to configure UART in Contiki-NG to receive 0x00 data.

Thanks and regards,
KoT

0 Severin Suveren over 6 years ago in reply to Koichiro Tashiro

TI__Mastermind 23730 points

Have you tried setting a breakpoint in uart0_cb() and verify that no interrupt occurs?

0 Severin Suveren over 6 years ago in reply to Severin Suveren

TI__Mastermind 23730 points

And have you also remembered to call uart0_set_callback()?

0 Koichiro Tashiro over 6 years ago in reply to Severin Suveren

TI__Mastermind 22935 points

Hi Edvard,

Yes. Customer uses both uart0_cb() and uart0_set_callback().

He confirmed UART data were received until 0x00.
Please see below example.
In this case, data sequence “10”,”02”,”00”,”03”,”01”,”01”,”FB” were sent from the host.
Then CC1312R was able to receive;
[DBG：SERIAL] Get Data_ c = 10
[DBG：SERIAL] Get Data_ c = 02
But “00” and later data were not received.

Please note that if data “00” is moved to other position, i.e. 4^th byte or 5^th byte, CC1312R can receive data just before “00”.

Thanks and regards
KoT

0 Severin Suveren over 6 years ago in reply to Koichiro Tashiro

TI__Mastermind 23730 points

Interesting, I'll take a deeper look.

0 Severin Suveren over 6 years ago in reply to Severin Suveren

TI__Mastermind 23730 points

Hi KoT,

I think this is an issue of your Serial Tester program, not the UART driver on Contiki-NG. I observed that multiple of my serial terminals did not send the 0x00 byte when pasted into the terminal. Only when I manually inserted the NUL character manually did everything work as expected.

superuser.com/.../putty-send-null

I confirmed that the UART driver works as intended by setting up a logic trace of the UART RX pin; when a 0x00 byte was received, the UART callback was correctly called with the 0x00 byte.

0 Koichiro Tashiro over 6 years ago in reply to Severin Suveren

TI__Mastermind 22935 points

Edvard,

Thanks a lot!
You are right. Customer confirmed it works with another PC software.

Thanks and regards,
KoT

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CC1312R: Contiki-NG: UART with binary mode