Garmin LVC 18 Technical Specification - Page 34
GPS 18 Technical Specifications 190-00307-00, DLE and ETX bytes
UPC - 753759061241
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DLE and ETX bytes: Sample C code to receive the two records should filter DLE and ETX bytes as described below: typedef enum { DAT, DLE, ETX } rx_state_type; /* Declare and initialize static variables */ static char in_que[ 256 ]; static int in_que_ptr = 0; static rx_state_type rx_state = DAT; . . . void add_to_que( char data ) { #define DLE_BYTE 0x10 #define ETX_BYTE 0x03 if ( rx_state == DAT ) { if ( data == DLE_BYTE ) { rx_state = DLE; } else { in_que[ in_que_ptr++ ] = data; } } else if ( rx_state == DLE ) { if ( data == ETX_BYTE ) { rx_state = ETX; } else { rx_state = DAT; in_que[ in_que_ptr++ ] = data; } } else if ( rx_state == ETX ) { if ( data == DLE_BYTE ) { rx_state = DLE; } } if ( in_que_ptr > 255 ) { in_que_ptr = 0; } } GPS 18 Technical Specifications (190-00307-00) Page 28 Rev. D