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AP_GPS: fixed hexdigit in NMEA detector 

thanks to adorus for spotting this! See issue#4255
This commit is contained in:
Andrew Tridgell 2016-06-06 07:36:31 +10:00
parent efef39732e
commit 2239fd6a6e
1 changed files with 2 additions and 1 deletions
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3
libraries/AP_GPS/AP_GPS_NMEA.cpp
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@ -94,7 +94,7 @@ const char AP_GPS_NMEA::_initialisation_blob[] = SIRF_INIT_MSG MTK_INIT_MSG UBLO
// Convenience macros //////////////////////////////////////////////////////////
//
#define DIGIT_TO_VAL(_x) (_x - '0')
#define hexdigit(x) ((x)>9?'A'+(x):'0'+(x))
#define hexdigit(x) ((x)>9?'A'+((x)-10):'0'+(x))
AP_GPS_NMEA::AP_GPS_NMEA(AP_GPS &_gps, AP_GPS::GPS_State &_state, AP_HAL::UARTDriver *_port) :
AP_GPS_Backend(_gps, _state, _port),
@ -473,6 +473,7 @@ AP_GPS_NMEA::_detect(struct NMEA_detect_state &state, uint8_t data)
break;
case 3:
if (hexdigit(state.ck&0xF) == data) {
state.step = 0;
return true;
}
state.step = 0;