Differences

This shows you the differences between two versions of the page.

--- code:interrupt_driven_ubx [2009/05/11 09:45] – laurenceb
+++ code:interrupt_driven_ubx [2009/05/11 20:17] (current) – laurenceb
@@ Line 1: / Line 1: @@
 under construction...
 ===== demo code =====
 <code c>
 #include <stdlib.h>
 #include <stdio.h>
@@ Line 39: / Line 42: @@
 		if(Gps.packetflag==REQUIRED_DATA)
 		{
-			printf("%d,%d,%d,%d,%d\n",Gps.latitude,Gps.longitude,Gps.altitude,Gps.status,Gps.nosats);
+			printf("%li,%li,%li,%2X,%2X\n",Gps.latitude,Gps.longitude,Gps.altitude,Gps.status,Gps.nosats);
 			Gps.packetflag=0;	//unlock the data
 		}
@@ Line 47: / Line 50: @@
 ISR(USART_RX_vect)				//UART interrupt on mega xx8 series
 {
-	static u08 state,class,id,checksum_1,checksum_2;
+	static u08 state,class,id,checksum_1,checksum_2,counter;
 	static u16 lenght;
 	static ubx_gps_type gps;
@@ Line 79: / Line 82: @@
 		case 5:				//the most significant byte
 			lenght|=c<<8;
+			counter=0;
 			state=6;
 			break;
@@ Line 96: / Line 100: @@
 				if(id==SOL_DATA && lenght==SOL_POS)
 					gps.status=c;
-				if(id==SVINFO_DATA && lenght==SATS_POS)
+				if(id==SOL_DATA && lenght==SATS_POS)
 					gps.nosats=c;
+				/*if(id==SVINFO_DATA)//this appears to find the number of hardware channels avaliable
+				{
+					counter++;//this counts from the start of data
+					if(counter==SATS_POS)
+						gps.nosats=c;
+				}*/
 			}
 			lenght--;
@@ Line 144: / Line 154: @@
 }
 </code>
 ===== header =====
-<code c>
+<code c>typedef unsigned char u08;
-typedef unsigned char u08;
 typedef uint16_t u16;
 typedef uint32_t u32;
@@ Line 171: / Line 181: @@
 #define NAV_CLASS 0x01
 #define SATS_POS 5
-#define SOL_POS 11
+#define SOL_POS 42
 #define POS_OFFSET 40
 #define POS_START 12