GPS buffer size ?

RE: GPS buffer size ?

Edvin — Tue, 16 Feb 2021 08:00:43 GMT

none of this is UART related. How do you initialize your UART, and how do you handle the incoming UART bytes? Do you use an event handler, or do you use a blocking UART rx function? If so, which one?

BR,

Edvin

RE: GPS buffer size ?

RixtronixLAB — Tue, 16 Feb 2021 00:37:25 GMT

currently I'm using 256 bytes,

Here's the callback,

if(GPS.rxIndex < sizeof(GPS.rxBuffer)-2)
	{
	
		GPS.rxBuffer[GPS.rxIndex] = GPS.rxTmp; //originally
		 
		GPS.rxIndex++;
		memcpy((void *)line_buffer_GPS, GPS.rxBuffer, GPS.rxIndex); 
	
			
	}

I try using memcpy to keep the buffer for processing,

I got "null" all the time

str=strstr((char*)line_buffer_GPS,"$GPGGA,");

or
==> always gone (empty buffer / astable ) str=strstr((char*)GPS.rxBuffer,"$GPGGA,");

?? any ideas

RE: GPS buffer size ?

Edvin — Mon, 15 Feb 2021 14:14:49 GMT

I am not sure I understand your setup. Are you using 512 or 256 bytes buffer? And what is the GPS module spitting out? How is it truncated? How did you set up your UART?

RE: GPS buffer size ?

RixtronixLAB — Mon, 15 Feb 2021 01:08:33 GMT

Data from GPS :

$GPGSV,3,2,11,13,38,221,22,14,78,058,23,15,04,228,,17,10,025,*7E

$A,151045.00,3207.99912,S,11559.30940,E,1,04,7.21,10.1,M,-30.6,M,,*56

$GPGSA,A,2,30,07,05,13,,,,,,,,,7.28,7.21,1.00*08

$GPGSV,3,1,11,05,47,269,25,07,24,119,23,08,10,130,,09,14,058,177775,47,269,25,07
,24,119,24,08,10,130,,09,14,058,16*74

$GPGSV,3,2,11,13,38,221,21,14,78,058,23,15,04,228,,17,10,025,*7D

$GPGSV,3,3,11,19,00,009,,28,72,016,16,30,55,148,22*49

$GPGLL,3207.99923,S,11559.30946,E,151050.00,A,A*7B

I reckon it's 512 bytes for buffer, but it's truncated when I transmitted to UART0 in I used 512 bytes buffer,

currently I used 256 bytes,

How can I increse it to 512 bytes without truncating it ? thanks