libuarte and buffer ?

[RixtronixLAB]

Dear Members,

I want to pass rxBuffer for processing,

 main()
 .
 .
 //nrf_libuarte_async_tx(&libuarte, GPS.rxBuffer, sizeof(GPS.rxBuffer));	//working	but can't be read by GPSNEO_Process ??	
			
			 GPSNeo_Process();
			 
why it can not be passed ?
it has been defined,


typedef struct 
{
	uint8_t		rxBuffer[256]; 
	uint16_t	rxIndex;
	uint8_t		rxTmp;	
	//uint16_t		rxTmp;	
	uint32_t	LastTime;	
	
	GPGGA_t		GPGGA;
	
}GPS_t;		

void	GPSNeo_Process(void)
{
	char	*str;
	
	
	
	
	if( (nrf_systick_val_get()-GPS.LastTime>50) && (GPS.rxIndex>0))
	
	.
	.
	.
	.
	}
	

Is it because of my Systick not yet running properly ?

thanks

[Jørgen Holmefjord]

Hi,

Where do you pass rxBuffer to GPSNeo_Process? Where/how is GPS declared? I can only see GPS_t defined in the code snippets.

Is it because of my Systick not yet running properly ?

SysTick is an ARM System Timer in the CPU, mainly used for RTOS implementations. This has nothing to do with your application variables/objects.

Best regards,
Jørgen 

[RixtronixLAB]

Hi Jorgen,

Thanks for the reply,

I found it, because of memset = 0 at the end of the loop, and zeroing all my buffer,

When my gps is locked, why is GPGGA gone ? before it's locked, GPGGA available, is it because of my antenna ?

or my buffer ? I give 256 for my gps buffer, how big do you reckon ?

I used 1024 for gps buffer before.

it takes a long time for my gps getting locked, is the signal strength too weak ? I used a small square antenna indoor.

I'll make a video shot so you can see it,

Before GPS locked,

https://youtu.be/0AsNVxWhGWQ

Thanks

[Jørgen Holmefjord]

Unfortunately, I'm not familiar with the GPS you are using or how it is working. I would recommend you to check with the manufacturer about the antenna and signal levels for that.