Test software for SatChat prototype hardware Platform - MAX32630FTHR
Dependencies: USBDevice max32630fthr
Diff: main.cpp
- Revision:
- 6:af25f19eb4e6
- Parent:
- 5:703f61be6ee2
- Child:
- 7:4218bb385ca4
diff -r 703f61be6ee2 -r af25f19eb4e6 main.cpp --- a/main.cpp Sat Jul 01 01:35:47 2017 +0000 +++ b/main.cpp Sat Jul 01 02:02:38 2017 +0000 @@ -29,7 +29,7 @@ char nmea_descriptor[5] = {0}; gps_power(on); while (1) { - char nmea_sentence[82] = {0}; //Fill with NUL terminators + char nmea_sentence[82] = {0}; //Fill with NULL terminators gps.format(8,Serial::None,1); while (gps.getc()!='$'); //wait for start of sentence int nmea_index = 0; @@ -47,6 +47,14 @@ nmea_index=80; //Don't overflow buffer } } + // Checksum + bool checksum_valid = FALSE; + int checksum = 0; + int i = 1; //After the '$' + while (nmea_sentence[i++] != '*'){ + checksum ^= nmea_sentence[i]; + } + pc.printf( "Checksum: %i\n\r", checksum ); // const char s[2] = ","; const char gprmc[7] = "$GPRMC"; char *token; @@ -77,7 +85,7 @@ data[1] = 0x19; //3.3V i2c.write( 0x50, data, 2 ); gps_power(off); - wait(5); + wait(2); while (1) { gps_update(); }