-/// Operational modes of the AD9954 DDS for the ddsSetMode function.
-typedef enum
-{
- /// Device has not been initialized.
- DDS_MODE_NOT_INITIALIZED,
-
- /// Device in lowest power down mode.
- DDS_MODE_POWERDOWN,
-
- /// Generate FM modulated audio tones.
- DDS_MODE_AFSK,
-
- /// Generate true FSK tones.
- DDS_MODE_FSK
-} DDS_MODE;
-
-void ddsInit();
-void ddsSetAmplitude (uint8_t amplitude);
-void ddsSetOutputScale (uint16_t amplitude);
-void ddsSetFSKFreq (uint32_t ftw0, uint32_t ftw1);
-void ddsSetFreq (uint32_t freq);
-void ddsSetFTW (uint32_t ftw);
-void ddsSetMode (DDS_MODE mode);
-
-/// Type of GPS fix.
-typedef enum
-{
- /// No GPS FIX
- GPS_NO_FIX,
-
- /// 2D (Latitude/Longitude) fix.
- GPS_2D_FIX,
-
- /// 3D (Latitude/Longitude/Altitude) fix.
- GPS_3D_FIX
-} GPS_FIX_TYPE;
-
-/// GPS Position information.
-typedef struct
-{
- /// Flag that indicates the position information has been updated since it was last checked.
- bool_t updateFlag;
-
- /// Month in UTC time.
- uint8_t month;
-
- /// Day of month in UTC time.
- uint8_t day;
-
- /// Hours in UTC time.
- uint8_t hours;
-
- /// Minutes in UTC time.
- uint8_t minutes;
-
- /// Seconds in UTC time.
- uint8_t seconds;
-
- /// Year in UTC time.
- uint16_t year;
-
- /// Latitude in milli arc-seconds where + is North, - is South.
- int32_t latitude;
-
- /// Longitude in milli arc-seconds where + is East, - is West.
- int32_t longitude;
-
- /// Altitude in cm
- int32_t altitudeCM;
-
- /// Calculated altitude in feet
- int32_t altitudeFeet;
-
- /// 3D speed in cm/second.
- uint16_t vSpeed;
-
- /// 2D speed in cm/second.
- uint16_t hSpeed;
-
- /// Heading units of 0.1 degrees.
- uint16_t heading;
-
- /// DOP (Dilution of Precision)
- uint16_t dop;
-
- /// 16-bit number that represents status of GPS engine.
- uint16_t status;
-
- /// Number of tracked satellites used in the fix position.
- uint8_t trackedSats;
-
- /// Number of visible satellites.
- uint8_t visibleSats;
-} GPSPOSITION_STRUCT;
-
-GPSPOSITION_STRUCT gpsPosition;
-
-void gpsInit();
-bool_t gpsIsReady();
-GPS_FIX_TYPE gpsGetFixType();
-int32_t gpsGetPeakAltitude();
-void gpsPowerOn();
-bool_t gpsSetup();
-void gpsUpdate();
-
-uint16_t sysCRC16(uint8_t *buffer, uint8_t length, uint16_t crc);
-
-uint8_t timeGetTicks();
-void timeInit();
-void timeSetDutyCycle (uint8_t dutyCycle);
-void timeUpdate();
-
-/// Operational modes of the TNC for the tncSetMode function.
-typedef enum
-{
- /// No operation waiting for setup and configuration.
- TNC_MODE_STANDBY,
-
- /// 1200 bps using A-FSK (Audio FSK) tones.
- TNC_MODE_1200_AFSK,
-
- /// 9600 bps using true FSK tones.
- TNC_MODE_9600_FSK
-} TNC_DATA_MODE;
-
-void tncInit();
-bool_t tncIsFree();
-void tncHighRate(bool_t state);
-void tncSetMode (TNC_DATA_MODE dataMode);
-void tnc1200TimerTick();
-void tnc9600TimerTick();
-void tncTxByte (uint8_t value);
-void tncTxPacket(TNC_DATA_MODE dataMode);
-
-/** @} */
-
-/**
- * @defgroup DDS AD9954 DDS (Direct Digital Synthesizer)
- *
- * Functions to control the Analog Devices AD9954 DDS.
- *
- * @{
- */
-
-/// AD9954 CFR1 - Control functions including RAM, profiles, OSK, sync, sweep, SPI, and power control settings.
-#define DDS_AD9954_CFR1 0x00
-
-/// AD9954 CFR2 - Control functions including sync, PLL multiplier, VCO range, and charge pump current.
-#define DDS_AD9954_CFR2 0x01
-
-/// AD9954 ASF - Auto ramp rate speed control and output scale factor (0x0000 to 0x3fff).
-#define DDS_AD9954_ASF 0x02
-
-/// AD9954 ARR - Amplitude ramp rate for OSK function.
-#define DDS_AD9954_ARR 0x03
-
-/// AD9954 FTW0 - Frequency tuning word 0.
-#define DDS_AD9954_FTW0 0x04
-
-/// AD9954 FTW1 - Frequency tuning word 1
-#define DDS_AD9954_FTW1 0x06
-
-/// AD9954 NLSCW - Negative Linear Sweep Control Word used for spectral shaping in FSK mode
-#define DDS_AD9954_NLSCW 0x07
-
-/// AD9954 PLSCW - Positive Linear Sweep Control Word used for spectral shaping in FSK mode
-#define DDS_AD9954_PLSCW 0x08
-
-/// AD9954 RSCW0 - RAM Segment Control Word 0
-#define DDS_AD9954_RWCW0 0x07
-
-/// AD9954 RSCW0 - RAM Segment Control Word 1
-#define DDS_AD9954_RWCW1 0x08
-
-/// AD9954 RAM segment
-#define DDS_RAM 0x0b
-
-/// Current operational mode.
-DDS_MODE ddsMode;
-
-/// Number of digits in DDS frequency to FTW conversion.
-#define DDS_FREQ_TO_FTW_DIGITS 9
-
-/// Array of multiplication factors used to convert frequency to the FTW.
-const uint32_t DDS_MULT[DDS_FREQ_TO_FTW_DIGITS] = { 11, 7, 7, 3, 4, 8, 4, 9, 1 };
-
-/// Array of divisors used to convert frequency to the FTW.
-const uint32_t DDS_DIVISOR[DDS_FREQ_TO_FTW_DIGITS - 1] = { 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000 };
-
-/// Lookup table to convert dB amplitude scale in 0.5 steps to a linear DDS scale factor.
-const uint16_t DDS_AMP_TO_SCALE[] =
-{
- 16383, 15467, 14601, 13785, 13013, 12286, 11598, 10949, 10337, 9759, 9213, 8697,
- 8211, 7752, 7318, 6909, 6522, 6157, 5813, 5488, 5181, 4891, 4617, 4359, 4115, 3885, 3668, 3463,
- 3269, 3086, 2913, 2750, 2597, 2451, 2314, 2185, 2062, 1947, 1838, 1735, 1638
-};
-
-
-/// Frequency Word List - 4.0KHz FM frequency deviation at 81.15MHz (445.950MHz)
-const uint32_t freqTable[256] =
-{
- 955418300, 955419456, 955420611, 955421765, 955422916, 955424065, 955425210, 955426351,
- 955427488, 955428618, 955429743, 955430861, 955431971, 955433073, 955434166, 955435249,
- 955436322, 955437385, 955438435, 955439474, 955440500, 955441513, 955442511, 955443495,
- 955444464, 955445417, 955446354, 955447274, 955448176, 955449061, 955449926, 955450773,
- 955451601, 955452408, 955453194, 955453960, 955454704, 955455426, 955456126, 955456803,
- 955457457, 955458088, 955458694, 955459276, 955459833, 955460366, 955460873, 955461354,
- 955461809, 955462238, 955462641, 955463017, 955463366, 955463688, 955463983, 955464250,
- 955464489, 955464701, 955464884, 955465040, 955465167, 955465266, 955465337, 955465380,
- 955465394, 955465380, 955465337, 955465266, 955465167, 955465040, 955464884, 955464701,
- 955464489, 955464250, 955463983, 955463688, 955463366, 955463017, 955462641, 955462238,
- 955461809, 955461354, 955460873, 955460366, 955459833, 955459276, 955458694, 955458088,
- 955457457, 955456803, 955456126, 955455426, 955454704, 955453960, 955453194, 955452408,
- 955451601, 955450773, 955449926, 955449061, 955448176, 955447274, 955446354, 955445417,
- 955444464, 955443495, 955442511, 955441513, 955440500, 955439474, 955438435, 955437385,
- 955436322, 955435249, 955434166, 955433073, 955431971, 955430861, 955429743, 955428618,
- 955427488, 955426351, 955425210, 955424065, 955422916, 955421765, 955420611, 955419456,
- 955418300, 955417144, 955415989, 955414836, 955413684, 955412535, 955411390, 955410249,
- 955409113, 955407982, 955406857, 955405740, 955404629, 955403528, 955402435, 955401351,
- 955400278, 955399216, 955398165, 955397126, 955396100, 955395088, 955394089, 955393105,
- 955392136, 955391183, 955390246, 955389326, 955388424, 955387540, 955386674, 955385827,
- 955385000, 955384192, 955383406, 955382640, 955381896, 955381174, 955380474, 955379797,
- 955379143, 955378513, 955377906, 955377324, 955376767, 955376235, 955375728, 955375246,
- 955374791, 955374362, 955373959, 955373583, 955373234, 955372912, 955372618, 955372350,
- 955372111, 955371900, 955371716, 955371560, 955371433, 955371334, 955371263, 955371220,
- 955371206, 955371220, 955371263, 955371334, 955371433, 955371560, 955371716, 955371900,
- 955372111, 955372350, 955372618, 955372912, 955373234, 955373583, 955373959, 955374362,
- 955374791, 955375246, 955375728, 955376235, 955376767, 955377324, 955377906, 955378513,
- 955379143, 955379797, 955380474, 955381174, 955381896, 955382640, 955383406, 955384192,
- 955385000, 955385827, 955386674, 955387540, 955388424, 955389326, 955390246, 955391183,
- 955392136, 955393105, 955394089, 955395088, 955396100, 955397126, 955398165, 955399216,
- 955400278, 955401351, 955402435, 955403528, 955404629, 955405740, 955406857, 955407982,
- 955409113, 955410249, 955411390, 955412535, 955413684, 955414836, 955415989, 955417144
-};
-
-/**
- * Set DDS frequency tuning word. The output frequency is equal to RefClock * (ftw / 2 ^ 32).
- *
- * @param ftw Frequency Tuning Word
- */
-void ddsSetFTW (uint32_t ftw)
-{
- int x = ftw - freqTable[0];
- putchar (x > 0 ? 0xc0 : 0x40);
-}
-
-/**
- * Convert frequency in hertz to 32-bit DDS FTW (Frequency Tune Word).
- *
- * @param freq frequency in Hertz
- *
- */
-void ddsSetFreq(uint32_t freq)
-{
- uint8_t i;
- uint32_t ftw;
-
- // To avoid rounding errors with floating point math, we do a long multiply on the data.
- ftw = freq * DDS_MULT[0];
-
- for (i = 0; i < DDS_FREQ_TO_FTW_DIGITS - 1; ++i)
- ftw += (freq * DDS_MULT[i+1]) / DDS_DIVISOR[i];
-
- ddsSetFTW (ftw);
-}
-
-/**
- * Set DDS frequency tuning word for the FSK 0 and 1 values. The output frequency is equal
- * to RefClock * (ftw / 2 ^ 32).
- *
- * @param ftw0 frequency tuning word for the FSK 0 value
- * @param ftw1 frequency tuning word for the FSK 1 value
- */
-void ddsSetFSKFreq (uint32_t ftw0, uint32_t ftw1)
-{
-// printf ("ftw0 %d ftw1 %d\n", ftw0, ftw1);
-}
-
-/**
- * Set the DDS to run in A-FSK, FSK, or PSK31 mode
- *
- * @param mode DDS_MODE_APRS, DDS_MODE_PSK31, or DDS_MODE_HF_APRS constant
- */
-void ddsSetMode (DDS_MODE mode)
-{
-// printf ("mode %d\n", mode);
-}
-
-/** @} */
-
-/**
- * @defgroup GPS Motorola M12+ GPS Engine
- *
- * Functions to control the Motorola M12+ GPS engine in native binary protocol mode.
- *
- * @{
- */
-
-/// The maximum length of a binary GPS engine message.
-#define GPS_BUFFER_SIZE 50
-
-/// GPS parse engine state machine values.
-typedef enum
-{
- /// 1st start character '@'
- GPS_START1,
-
- /// 2nd start character '@'
- GPS_START2,
-
- /// Upper case 'A' - 'Z' message type
- GPS_COMMAND1,
-
- /// Lower case 'a' - 'z' message type
- GPS_COMMAND2,
-
- /// 0 - xx bytes based on message type 'Aa'
- GPS_READMESSAGE,
-
- /// 8-bit checksum
- GPS_CHECKSUMMESSAGE,
-
- /// End of message - Carriage Return
- GPS_EOMCR,
-
- /// End of message - Line Feed
- GPS_EOMLF
-} GPS_PARSE_STATE_MACHINE;
-
-/// Index into gpsBuffer used to store message data.
-uint8_t gpsIndex;
-
-/// State machine used to parse the GPS message stream.
-GPS_PARSE_STATE_MACHINE gpsParseState;
-
-/// Buffer to store data as it is read from the GPS engine.
-uint8_t gpsBuffer[GPS_BUFFER_SIZE];
-
-/// Peak altitude detected while GPS is in 3D fix mode.
-int32_t gpsPeakAltitude;
-
-/// Checksum used to verify binary message from GPS engine.
-uint8_t gpsChecksum;
-
-/// Last verified GPS message received.
-GPSPOSITION_STRUCT gpsPosition;
-
-/**
- * Get the type of fix.
- *
- * @return gps fix type enumeration
- */
-GPS_FIX_TYPE gpsGetFixType()
-{
- // The upper 3-bits determine the fix type.
- switch (gpsPosition.status & 0xe000)
- {
- case 0xe000:
- return GPS_3D_FIX;
-
- case 0xc000:
- return GPS_2D_FIX;
-
- default:
- return GPS_NO_FIX;
- } // END switch
-}
-
-/**
- * Peak altitude detected while GPS is in 3D fix mode since the system was booted.
- *
- * @return altitude in feet
- */
-int32_t gpsGetPeakAltitude()
-{
- return gpsPeakAltitude;
-}
-
-/**
- * Initialize the GPS subsystem.
- */
-void gpsInit()
-{
- // Initial parse state.
- gpsParseState = GPS_START1;
-
- // Assume we start at sea level.
- gpsPeakAltitude = 0;
-
- // Clear the structure that stores the position message.
- memset (&gpsPosition, 0, sizeof(GPSPOSITION_STRUCT));
-
- // Setup the timers used to measure the 1-PPS time period.
-// setup_timer_3(T3_INTERNAL | T3_DIV_BY_1);
-// setup_ccp2 (CCP_CAPTURE_RE | CCP_USE_TIMER3);
-}
-
-/**
- * Determine if new GPS message is ready to process. This function is a one shot and
- * typically returns true once a second for each GPS position fix.
- *
- * @return true if new message available; otherwise false
- */
-bool_t gpsIsReady()
-{
- return true;
- if (gpsPosition.updateFlag)
- {
- gpsPosition.updateFlag = false;
- return true;
- } // END if
-
- return false;
-}
-
-/**
- * Calculate NMEA-0183 message checksum of buffer that is length bytes long.
- *
- * @param buffer pointer to data buffer.
- * @param length number of bytes in buffer.
- *
- * @return checksum of buffer
- */
-uint8_t gpsNMEAChecksum (uint8_t *buffer, uint8_t length)
-{
- uint8_t i, checksum;
-
- checksum = 0;
-
- for (i = 0; i < length; ++i)
- checksum ^= buffer[i];
-
- return checksum;
-}
-
-/**
- * Verify the GPS engine is sending the @@Hb position report message. If not,
- * configure the GPS engine to send the desired report.
- *
- * @return true if GPS engine operation; otherwise false
- */
-bool_t gpsSetup()
-{
- uint8_t startTime, retryCount;
-
- // We wait 10 seconds for the GPS engine to respond to our message request.
- startTime = timeGetTicks();
- retryCount = 0;
-
- while (++retryCount < 10)
- {
- // Read the serial FIFO and process the GPS messages.
-// gpsUpdate();
-
- // If a GPS data set is available, then GPS is operational.
- if (gpsIsReady())
- {
-// timeSetDutyCycle (TIME_DUTYCYCLE_10);
- return true;
- }
-
- if (timeGetTicks() > startTime)
- {
- puts ("@@Hb\001\053\015\012");
- startTime += 10;
- } // END if
-
- } // END while
-
- return false;
-}
-
-/**
- * Parse the Motorola @@Hb (Short position/message) report.
- */
-void gpsParsePositionMessage()
-{
- // Convert the binary stream into data elements. We will scale to the desired units
- // as the values are used.
- gpsPosition.updateFlag = true;
-
- gpsPosition.month = gpsBuffer[0];
- gpsPosition.day = gpsBuffer[1];
- gpsPosition.year = ((uint16_t) gpsBuffer[2] << 8) | gpsBuffer[3];
- gpsPosition.hours = gpsBuffer[4];
- gpsPosition.minutes = gpsBuffer[5];
- gpsPosition.seconds = gpsBuffer[6];
- gpsPosition.latitude = ((int32) gpsBuffer[11] << 24) | ((int32) gpsBuffer[12] << 16) | ((int32) gpsBuffer[13] << 8) | (int32) gpsBuffer[14];
- gpsPosition.longitude = ((int32) gpsBuffer[15] << 24) | ((int32) gpsBuffer[16] << 16) | ((int32) gpsBuffer[17] << 8) | gpsBuffer[18];
- gpsPosition.altitudeCM = ((int32) gpsBuffer[19] << 24) | ((int32) gpsBuffer[20] << 16) | ((int32) gpsBuffer[21] << 8) | gpsBuffer[22];
- gpsPosition.altitudeFeet = gpsPosition.altitudeCM * 100l / 3048l;
- gpsPosition.vSpeed = ((uint16_t) gpsBuffer[27] << 8) | gpsBuffer[28];
- gpsPosition.hSpeed = ((uint16_t) gpsBuffer[29] << 8) | gpsBuffer[30];
- gpsPosition.heading = ((uint16_t) gpsBuffer[31] << 8) | gpsBuffer[32];
- gpsPosition.dop = ((uint16_t) gpsBuffer[33] << 8) | gpsBuffer[34];
- gpsPosition.visibleSats = gpsBuffer[35];
- gpsPosition.trackedSats = gpsBuffer[36];
- gpsPosition.status = ((uint16_t) gpsBuffer[37] << 8) | gpsBuffer[38];
-
- // Update the peak altitude if we have a valid 3D fix.
- if (gpsGetFixType() == GPS_3D_FIX)
- if (gpsPosition.altitudeFeet > gpsPeakAltitude)
- gpsPeakAltitude = gpsPosition.altitudeFeet;
-}
-
-/**
- * Turn on the GPS engine power and serial interface.
- */
-void gpsPowerOn()
-{
- // 3.0 VDC LDO control line.
-// output_high (IO_GPS_PWR);
-
-}