Sending Ctrl+z over uart

RE: Sending Ctrl+z over uart

Rajbir Singh — Wed, 26 May 2021 15:00:33 GMT

How do you reading the responses sent back

RE: Sending Ctrl+z over uart

Dcrossd — Wed, 12 Jun 2019 11:33:42 GMT

yes i changed that too

RE: Sending Ctrl+z over uart

cbd — Wed, 12 Jun 2019 11:30:33 GMT

Did you check & change the line with the number to which you're sending the message? I think that it's wrong.

RE: Sending Ctrl+z over uart

Dcrossd — Wed, 12 Jun 2019 11:21:05 GMT

I checked on my debug window and i see that 0x1A is sent on the tx_buf but still i am not getting the message. Does ctrl+z have any other escape sequence?

RE: Sending Ctrl+z over uart

cbd — Tue, 11 Jun 2019 11:45:53 GMT

I've just had a peek at the AT-Command manual for the SIM800 devices.

It looks to me that your number is incorrectly entered. I think that it should be:

		printf("AT+CMGS=\"919xxxxx22\", 145\r");

+CMGS=<da>[, <toda>] <CR>text is entered <ctrl-Z/ESC

<da> GSM 03.40 TP-Destination-Address Address-Value field in string format(string should be included in quotation marks); BCD numbers (or GSM default alphabet characters) are converted to characters of the currently selected TE character set (specified by +CSCS in 3GPP TS 27.007); type of address given by <toda>

<toda> GSM 04.11 TP-Destination-Address Type-of-Address octet in integer format (when first character of <da> is + (IRA 43) default is 145, otherwise default is 129)

RE: Sending Ctrl+z over uart

Dcrossd — Tue, 11 Jun 2019 11:25:06 GMT

Thank you for the response.

AT+CMGS=<number><CR><message><CTRL-Z> (This the format of the AT commands that has to be sent).

printf("\r\nAT+CMGF=1\n");
		nrf_delay_ms(5000);
		printf("AT+CMGS=\"+919xxxxx22\"\r");
		nrf_delay_ms(2000);
		printf("Hello,Elecrow!");
		nrf_delay_ms(1000);
        printf("%c", 0x1A);	// i tried this but its not working , i have put ctrl+z here 
		nrf_delay_ms(1000);
		printf("\r\nAT\r\n");
		nrf_delay_ms(5000);

the rest of the AT commands are giving proper return values

RE: Sending Ctrl+z over uart

cbd — Tue, 11 Jun 2019 11:06:56 GMT

Yes you're right, my mistake.

I usually treat my data as binary and build them up in a buffer before sending.

As far as I can tell it should work.

Are you attempting to escape back to an AT-Command string?

Do you need to place <CR><LF> after the CTRL-Z?

Otherwise have you tried something like

printf("%c", 0x1A);

RE: Sending Ctrl+z over uart

Dcrossd — Tue, 11 Jun 2019 10:13:40 GMT

When I put printf('\x1A') it gives me a warning telling 'format string is not a string literal'.

RE: Sending Ctrl+z over uart

cbd — Tue, 11 Jun 2019 07:02:23 GMT

I think that your problem is that you're passing a string rather than a character.

Try

printf('\x1A');