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This code holds the complete demo set for the sx1280: PingPong, PER and Ranging Outdoor demo application. >>>>> This code MUST run on the mbed library release 127 or everything will be painfully slow.
Dependencies: mbed SX1280Lib DmTftLibrary
* This code MUST run on the mbed library release 127 or everything will be painfully slow.*
Peripherals/GpsMax7.cpp
- Committer:
- mverdy
- Date:
- 2018-11-08
- Revision:
- 20:626b92b70bf7
File content as of revision 20:626b92b70bf7:
/* ______ _ / _____) _ | | ( (____ _____ ____ _| |_ _____ ____| |__ \____ \| ___ | (_ _) ___ |/ ___) _ \ _____) ) ____| | | || |_| ____( (___| | | | (______/|_____)_|_|_| \__)_____)\____)_| |_| (C)2016 Semtech Description: uBlox MAX7 GPS Maintainer: Gregory Cristian & Gilbert Menth */ #include <stdio.h> #include "mbed.h" #include "Timers.h" #include "GpsMax7.h" #define MAX_NMEA_SENTENCE_LENGTH 100 #define GPS_I2C_ADDR ( 0x84 ) // GPS IC I2C address #define NUM_SETUP_COMMANDS 7 #define SETUP_COMMAND_LENGTH 16 #define DATA_STREAM_ADDRESS 0xFF #define I2C_FREQUENCY 100000 //100 kHz typedef enum { GPGGA_NMEA_DOLLAR, GPGGA_NMEA_G1, GPGGA_NMEA_P, GPGGA_NMEA_G2, GPGGA_NMEA_G3, GPGGA_NMEA_A, GPGGA_NMEA_CR, GPGGA_NMEA_LF }GpggaNmeaFields_t; typedef enum { GPZDA_NMEA_DOLLAR, GPZDA_NMEA_G1, GPZDA_NMEA_P, GPZDA_NMEA_G2, GPZDA_NMEA_G3, GPZDA_NMEA_A, GPZDA_NMEA_CR, GPZDA_NMEA_LF }GpzdaNmeaFields_t; typedef enum { GPS_COMMS_INIT, GPS_COMMS_WRITE_SETUP, GPS_COMMS_WAIT_WRITE_SETUP, GPS_COMMS_READ_DATA_BUFFER, GPS_COMMS_WAIT_NEXT_READ }GpsCommsState_t; union GpsBufferSize { uint16_t NumBytes; char NumBytesBuffer[2]; }; //MAX7 initialisation commands const char SetupArray[NUM_SETUP_COMMANDS][SETUP_COMMAND_LENGTH] = { { 0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0xF0, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29 }, // GxGGA on to I2C { 0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0xF0, 0x08, 0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x09, 0x62 }, // GxZDA on to I2C { 0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0xF0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x2B }, // GxGLL not on the I2C { 0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0xF0, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x04, 0x40 }, // GxRMC not on the I2C { 0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0xF0, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x05, 0x47 }, // GxVTG not on the I2C { 0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0xF0, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x32 }, // GxGSA not on the I2C { 0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0xF0, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x39 } // GxGSV not on the I2C }; I2C GpsI2C( I2C_SDA, I2C_SCL ); GpsStruct Gps; static uint8_t GpggaSentenceBuffer[MAX_NMEA_SENTENCE_LENGTH]; static int GpggaSentenceBufferPtr = 0; static uint8_t GpzdaSentenceBuffer[MAX_NMEA_SENTENCE_LENGTH]; static int GpzdaSentenceBufferPtr = 0; static GpggaNmeaFields_t GpggaNmeaField; static GpzdaNmeaFields_t GpzdaNmeaField; static GpsCommsState_t GpsCommsState; static uint32_t GpsCommsTimer; static void GpsCheckCommandBufferForGpgga( uint8_t thisChar ); static void GpsCheckCommandBufferForGpzda( uint8_t thisChar ); static void ParseNmeaGpggaSentence( void ); static void ParseNmeaGpzdaSentence( void ); static bool Max7GpsWriteSetupOK( void ); static bool Max7GpsReadDataBuffer( void ); static uint8_t Max7GpsReadRegister( char thisRegAddress ); void Max7GpsInit( void ) { GpsI2C.frequency( I2C_FREQUENCY ); } void Max7GpsHandle( void ) { switch( GpsCommsState ) { case GPS_COMMS_INIT: GpsCommsState = GPS_COMMS_WRITE_SETUP; break; case GPS_COMMS_WRITE_SETUP: if( Max7GpsWriteSetupOK( ) ) { GpsCommsState = GPS_COMMS_READ_DATA_BUFFER; } else { TimersSetTimer( &GpsCommsTimer, 1 * TIM_SEC ); GpsCommsState = GPS_COMMS_WAIT_WRITE_SETUP; } break; case GPS_COMMS_WAIT_WRITE_SETUP: if( TimersTimerHasExpired( &GpsCommsTimer ) ) { GpsCommsState = GPS_COMMS_WRITE_SETUP; } break; case GPS_COMMS_READ_DATA_BUFFER: Max7GpsReadDataBuffer( ); TimersSetTimer( &GpsCommsTimer, 100 * TIM_MSEC ); GpsCommsState = GPS_COMMS_WAIT_NEXT_READ; break; case GPS_COMMS_WAIT_NEXT_READ: if( TimersTimerHasExpired( &GpsCommsTimer ) ) { GpsCommsState = GPS_COMMS_READ_DATA_BUFFER; } break; } } static bool Max7GpsWriteSetupOK( void ) { int lineCount; for( lineCount = 0; lineCount < NUM_SETUP_COMMANDS; lineCount++ ) { if( GpsI2C.write( GPS_I2C_ADDR, &SetupArray[lineCount][0], \ SETUP_COMMAND_LENGTH, 0 ) ) { return false; } } return true; } static bool Max7GpsReadDataBuffer( void ) { uint8_t incomingCheck; bool contFlag = true; while( contFlag ) { incomingCheck = Max7GpsReadRegister( DATA_STREAM_ADDRESS ); if( incomingCheck == 0xFF ) { contFlag = false; } else { GpsCheckCommandBufferForGpgga( incomingCheck ); GpsCheckCommandBufferForGpzda( incomingCheck ); } } return false; } static uint8_t Max7GpsReadRegister( char thisRegAddress ) { char thisValue; uint8_t retVal; thisValue = thisRegAddress; GpsI2C.write( GPS_I2C_ADDR, &thisValue, 1, 0 ); GpsI2C.read( GPS_I2C_ADDR, &thisValue, 1, 0 ); retVal = ( uint8_t )thisValue; return retVal; } static void GpsCheckCommandBufferForGpgga( uint8_t thisChar ) { switch( GpggaNmeaField ) { default: case GPGGA_NMEA_DOLLAR: if( thisChar == '$' ) { GpggaSentenceBufferPtr = 0; GpggaSentenceBuffer[GpggaSentenceBufferPtr++] = thisChar; GpggaNmeaField = GPGGA_NMEA_G1; } break; case GPGGA_NMEA_G1: if( thisChar == 'G' ) { GpggaSentenceBuffer[GpggaSentenceBufferPtr++] = thisChar; GpggaNmeaField = GPGGA_NMEA_P; } else { GpggaNmeaField = GPGGA_NMEA_DOLLAR; } break; case GPGGA_NMEA_P: if( thisChar == 'P' ) { GpggaSentenceBuffer[GpggaSentenceBufferPtr++] = thisChar; GpggaNmeaField = GPGGA_NMEA_G2; } else { GpggaNmeaField = GPGGA_NMEA_DOLLAR; } break; case GPGGA_NMEA_G2: if( thisChar == 'G' ) { GpggaSentenceBuffer[GpggaSentenceBufferPtr++] = thisChar; GpggaNmeaField = GPGGA_NMEA_G3; } else { GpggaNmeaField = GPGGA_NMEA_DOLLAR; } break; case GPGGA_NMEA_G3: if( thisChar == 'G' ) { GpggaSentenceBuffer[GpggaSentenceBufferPtr++] = thisChar; GpggaNmeaField = GPGGA_NMEA_A; } else { GpggaNmeaField = GPGGA_NMEA_DOLLAR; } break; case GPGGA_NMEA_A: if( thisChar == 'A' ) { GpggaSentenceBuffer[GpggaSentenceBufferPtr++] = thisChar; GpggaNmeaField = GPGGA_NMEA_CR; } else { GpggaNmeaField = GPGGA_NMEA_DOLLAR; } break; case GPGGA_NMEA_CR: GpggaSentenceBuffer[GpggaSentenceBufferPtr++] = thisChar; if( GpggaSentenceBufferPtr >= MAX_NMEA_SENTENCE_LENGTH ) { GpggaNmeaField = GPGGA_NMEA_DOLLAR; } if( thisChar == 0x0A ) { ParseNmeaGpggaSentence( ); } break; case GPGGA_NMEA_LF: break; } } static void GpsCheckCommandBufferForGpzda( uint8_t thisChar ) { switch( GpzdaNmeaField ) { default: case GPZDA_NMEA_DOLLAR: if( thisChar == '$' ) { GpzdaSentenceBufferPtr = 0; GpzdaSentenceBuffer[GpzdaSentenceBufferPtr++] = thisChar; GpzdaNmeaField = GPZDA_NMEA_G1; } break; case GPZDA_NMEA_G1: if( thisChar == 'G' ) { GpzdaSentenceBuffer[GpzdaSentenceBufferPtr++] = thisChar; GpzdaNmeaField = GPZDA_NMEA_P; } else { GpzdaNmeaField = GPZDA_NMEA_DOLLAR; } break; case GPZDA_NMEA_P: if( thisChar == 'P' ) { GpzdaSentenceBuffer[GpzdaSentenceBufferPtr++] = thisChar; GpzdaNmeaField = GPZDA_NMEA_G2; } else { GpzdaNmeaField = GPZDA_NMEA_DOLLAR; } break; case GPZDA_NMEA_G2: if( thisChar == 'Z' ) { GpzdaSentenceBuffer[GpzdaSentenceBufferPtr++] = thisChar; GpzdaNmeaField = GPZDA_NMEA_G3; } else { GpzdaNmeaField = GPZDA_NMEA_DOLLAR; } break; case GPZDA_NMEA_G3: if( thisChar == 'D' ) { GpzdaSentenceBuffer[GpzdaSentenceBufferPtr++] = thisChar; GpzdaNmeaField = GPZDA_NMEA_A; } else { GpzdaNmeaField = GPZDA_NMEA_DOLLAR; } break; case GPZDA_NMEA_A: if( thisChar == 'A' ) { GpzdaSentenceBuffer[GpzdaSentenceBufferPtr++] = thisChar; GpzdaNmeaField = GPZDA_NMEA_CR; } else { GpzdaNmeaField = GPZDA_NMEA_DOLLAR; } break; case GPZDA_NMEA_CR: GpzdaSentenceBuffer[GpzdaSentenceBufferPtr++] = thisChar; if( GpzdaSentenceBufferPtr >= MAX_NMEA_SENTENCE_LENGTH ) { GpzdaNmeaField = GPZDA_NMEA_DOLLAR; } if( thisChar == 0x0A ) { ParseNmeaGpzdaSentence( ); } break; case GPZDA_NMEA_LF: break; } } static void ParseNmeaGpggaSentence( void ) { GpggaStruct thisFix; int sentencePtr = 1; int subStrPtr = 0; int commaCount = 0; uint8_t checkSum = 0; uint8_t thisChar; bool contFlag = true; char tArray[3]; char compArray[3]; while( contFlag ) //Get the checksum { thisChar = GpggaSentenceBuffer[sentencePtr]; if( thisChar == '*' ) { contFlag = false; } else { checkSum ^= thisChar; } sentencePtr++; if( sentencePtr >= MAX_NMEA_SENTENCE_LENGTH ) { thisFix.Fixed = false; return; } } compArray[0] = GpggaSentenceBuffer[sentencePtr++]; compArray[1] = GpggaSentenceBuffer[sentencePtr]; compArray[2] = 0x00; sentencePtr = 0; sprintf( tArray, "%02X", checkSum ); if( strcmp( tArray, compArray ) != 0 ) //Fails checksum { thisFix.Fixed = false; return; } while( commaCount < 6 ) //Find fix quality { if( GpggaSentenceBuffer[sentencePtr++] == ',' ) { commaCount++; } if( sentencePtr >= MAX_NMEA_SENTENCE_LENGTH ) { thisFix.Fixed = false; return; } } switch( GpggaSentenceBuffer[sentencePtr++] ) { case '1': case '2': case '3': case '4': thisFix.Fixed = true; break; default: thisFix.Fixed = false; break; } sentencePtr++; //Skip comma after fix thisFix.NumSats[subStrPtr++] = GpggaSentenceBuffer[sentencePtr++]; thisFix.NumSats[subStrPtr++] = GpggaSentenceBuffer[sentencePtr++]; thisFix.NumSats[subStrPtr] = 0; if( thisFix.Fixed ) { sentencePtr = 0; commaCount = 0; while( commaCount < 1 ) //Find fix time { if( GpggaSentenceBuffer[sentencePtr++] == ',' ) { commaCount++; } if( sentencePtr >= MAX_NMEA_SENTENCE_LENGTH ) { thisFix.Fixed = false; return; } } subStrPtr = 0; // Skip over time field as this can be picked up from the other sentence sentencePtr += 6; while( commaCount < 2 ) //Find Latitude { if( GpzdaSentenceBuffer[sentencePtr++] == ',' ) { commaCount++; } if( sentencePtr >= MAX_NMEA_SENTENCE_LENGTH ) { thisFix.Fixed = false; return; } } subStrPtr = 0; for( commaCount = 0; commaCount < 10; commaCount++ ) { thisFix.Lat[subStrPtr++] = GpggaSentenceBuffer[sentencePtr++]; } sentencePtr++; // Skip next comma thisFix.Lat[subStrPtr++] = ' '; //Add a space thisFix.Lat[subStrPtr++] = GpggaSentenceBuffer[sentencePtr++]; //N or S thisFix.Lat[subStrPtr] = 0x00; //String terminate while( commaCount < 4 ) //Find Longitude { if( GpggaSentenceBuffer[sentencePtr++] == ',' ) { commaCount++; } if( sentencePtr >= MAX_NMEA_SENTENCE_LENGTH ) { thisFix.Fixed = false; return; } } sentencePtr++; // Skip this comma subStrPtr = 0; for( commaCount = 0; commaCount < 11; commaCount++ ) { thisFix.Long[subStrPtr++] = GpggaSentenceBuffer[sentencePtr++]; } sentencePtr++; // Skip next comma thisFix.Long[subStrPtr++] = ' '; //Add a space thisFix.Long[subStrPtr++] = GpggaSentenceBuffer[sentencePtr++]; //E or W thisFix.Long[subStrPtr] = 0x00; //String terminate } thisFix.Updated = true; Gps.Position = thisFix; } static void ParseNmeaGpzdaSentence( void ) { GpzdaStruct thisTime; int sentencePtr = 1; int commaCount = 0; uint8_t checkSum = 0; uint8_t thisChar; bool contFlag = true; char tArray[3]; char compArray[3]; while( contFlag ) //Get the checksum { thisChar = GpzdaSentenceBuffer[sentencePtr]; if( thisChar == '*' ) { contFlag = false; } else { checkSum ^= thisChar; } sentencePtr++; if( sentencePtr >= MAX_NMEA_SENTENCE_LENGTH ) { return; } } compArray[0] = GpzdaSentenceBuffer[sentencePtr++]; compArray[1] = GpzdaSentenceBuffer[sentencePtr]; compArray[2] = 0x00; sentencePtr = 0; sprintf( tArray, "%02X", checkSum ); if( strcmp( tArray, compArray ) != 0 ) //Fails checksum { return; } while( commaCount < 1 ) //Start with hours (first field) { if( GpzdaSentenceBuffer[sentencePtr++] == ',' ) { commaCount++; } if( sentencePtr >= MAX_NMEA_SENTENCE_LENGTH ) { return; } } thisTime.Hour[0] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Hour[1] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Hour[2] = 0x00; thisTime.Minute[0] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Minute[1] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Minute[2] = 0x00; thisTime.Second[0] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Second[1] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Second[2] = 0x00; sentencePtr += 4; thisTime.Day[0] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Day[1] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Day[2] = 0x00; sentencePtr += 1; thisTime.Month[0] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Month[1] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Month[2] = 0x00; sentencePtr += 1; thisTime.Year[0] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Year[1] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Year[2] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Year[3] = GpzdaSentenceBuffer[sentencePtr++]; thisTime.Year[4] = 0x00; thisTime.Updated = true; Gps.Time = thisTime; } GpsStruct* Max7GpsgetData( void ) { return &Gps ; }