uint16_t sysCRC16(uint8_t *buffer, uint8_t length, uint16_t crc);
-uint8_t timeGetTicks();
void timeInit();
void timeSetDutyCycle (uint8_t dutyCycle);
void timeUpdate();
/** @} */
-/**
- * @defgroup DDS AD9954 DDS (Direct Digital Synthesizer)
- *
- * Functions to control the Analog Devices AD9954 DDS.
- *
- * @{
- */
-
-/// 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);
-}
-
-/** @} */
-
/**
* @defgroup sys System Library Functions
*
* @{
*/
-/// A counter that ticks every 100mS.
-uint8_t timeTicks;
-
-/// Counts the number of 104uS interrupts for a 100mS time period.
-uint16_t timeInterruptCount;
-
-/// Counts the number of 100mS time periods in 1 second.
-uint8_t time100ms;
-
-/// System time in seconds.
-uint8_t timeSeconds;
-
-/// System time in minutes.
-uint8_t timeMinutes;
-
-/// System time in hours.
-uint8_t timeHours;
-
-/// Desired LED duty cycle 0 to 9 where 0 = 0% and 9 = 90%.
-uint8_t timeDutyCycle;
-
-/// Current value of the timer 1 compare register used to generate 104uS interrupt rate (9600bps).
-uint16_t timeCompare;
-
/// 16-bit NCO where the upper 8-bits are used to index into the frequency generation table.
uint16_t timeNCO;
/// Counter used to deciminate down from the 104uS to 833uS interrupt rate. (9600 to 1200 baud)
uint8_t timeLowRateCount;
-/// Flag set true once per second.
-bool_t timeUpdateFlag;
-
-/// Flag that indicate the flight time should run.
-bool_t timeRunFlag;
-
-/// The change in the CCP_1 register for each 104uS (9600bps) interrupt period.
-#define TIME_RATE 125
-
-/**
- * Running 8-bit counter that ticks every 100mS.
- *
- * @return 100mS time tick
- */
-uint8_t timeGetTicks()
-{
- return timeTicks;
-}
-
/**
* Initialize the real-time clock.
*/
void timeInit()
{
- timeTicks = 0;
- timeInterruptCount = 0;
-// time100mS = 0;
- timeSeconds = 0;
- timeMinutes = 0;
- timeHours = 0;
- timeCompare = TIME_RATE;
- timeUpdateFlag = false;
timeNCO = 0x00;
timeLowRateCount = 0;
timeNCOFreq = 0x2000;
- timeRunFlag = false;
-}
-
-/**
- * Function return true once a second based on real-time clock.
- *
- * @return true on one second tick; otherwise false
- */
-bool_t timeIsUpdate()
-{
- if (timeUpdateFlag)
- {
- timeUpdateFlag = false;
- return true;
- } // END if
-
- return false;
-}
-
-/**
- * Set a flag to indicate the flight time should run. This flag is typically set when the payload
- * lifts off.
- */
-void timeSetRunFlag()
-{
- timeRunFlag = true;
-}
-
-/**
- * Timer interrupt handler called every 104uS (9600 times/second).
- */
-void timeUpdate()
-{
- // Setup the next interrupt for the operational mode.
- timeCompare += TIME_RATE;
-
- ddsSetFTW (freqTable[timeNCO >> 8]);
-
- timeNCO += timeNCOFreq;
-
- if (++timeLowRateCount == 8)
- {
- timeLowRateCount = 0;
- tnc1200TimerTick();
- } // END if
}
/** @} */
TNC_TX_END
} TNC_TX_1200BPS_STATE;
-/// Enumeration of the messages we can transmit.
-typedef enum
-{
- /// Startup message that contains software version information.
- TNC_BOOT_MESSAGE,
-
- /// Plain text status message.
- TNC_STATUS,
-
- /// Message that contains GPS NMEA-0183 $GPGGA message.
- TNC_GGA,
-
- /// Message that contains GPS NMEA-0183 $GPRMC message.
- TNC_RMC
-} TNC_MESSAGE_TYPE;
-
/// AX.25 compliant packet header that contains destination, station call sign, and path.
/// 0x76 for SSID-11, 0x78 for SSID-12
uint8_t TNC_AX25_HEADER[30] = {
'W' << 1, 'I' << 1, 'D' << 1, 'E' << 1, '3' << 1, ' ' << 1, 0x67, \
0x03, 0xf0 };
-
/// The next bit to transmit.
uint8_t tncTxBit;
/// Pointer to TNC buffer as we save each byte during message preparation.
uint8_t *tncBufferPnt;
-/// The type of message to tranmit in the next packet.
-TNC_MESSAGE_TYPE tncPacketType;
-
/// Buffer to hold the message portion of the AX.25 packet as we prepare it.
uint8_t tncBuffer[TNC_BUFFER_SIZE];
{
tncTxBit = 0;
tncMode = TNC_TX_READY;
- tncPacketType = TNC_BOOT_MESSAGE;
}
/**
tncLength += c;
}
+static int16_t
+tncFill(uint8_t *buf, int16_t len)
+{
+ int16_t l = 0;
+ uint8_t b;
+ uint8_t bit;
+
+ while (tncMode != TNC_TX_READY && l < len) {
+ b = 0;
+ for (bit = 0; bit < 8; bit++) {
+ b = b << 1 | (timeNCO >> 15);
+ timeNCO += timeNCOFreq;
+ }
+ *buf++ = b;
+ l++;
+ tnc1200TimerTick();
+ }
+ if (tncMode == TNC_TX_READY)
+ l = -l;
+ return l;
+}
+
/**
* Prepare an AX.25 data packet. Each time this method is called, it automatically
* rotates through 1 of 3 messages.
tncIndex = 0;
tncMode = TNC_TX_SYNC;
- // Turn on the PA chain.
-// output_high (IO_PTT);
-
- // Wait for the PA chain to power up.
-// delay_ms (10);
-
- // Key the DDS.
-// output_high (IO_OSK);
+ timeInit();
- // Log the battery and reference voltage just after we key the transmitter.
-// sysLogVoltage();
- while (tncMode != TNC_TX_READY)
- timeUpdate();
+ ao_radio_send_lots(tncFill);
}
/** @} */
projects / fw / altos / blobdiff