// Public methods, constants, and data structures for each class.
-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);
+static void timeInit(void);
-uint16_t sysCRC16(uint8_t *buffer, uint8_t length, uint16_t crc);
-
-uint8_t timeGetTicks();
-void timeInit();
-void timeSetDutyCycle (uint8_t dutyCycle);
-void timeUpdate();
-
-void tncInit();
-void tnc1200TimerTick();
-void tncTxByte (uint8_t value);
-void tncTxPacket(void);
+static void tncInit(void);
+static void tnc1200TimerTick(void);
/** @} */
*
* @return CRC-16 of buffer[0 .. length]
*/
-uint16_t sysCRC16(uint8_t *buffer, uint8_t length, uint16_t crc)
+static uint16_t sysCRC16(const uint8_t *buffer, uint8_t length, uint16_t crc)
{
uint8_t i, bit, value;
* @{
*/
-/// 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;
+static uint16_t timeNCO;
/// Audio tone NCO update step (phase).
-uint16_t timeNCOFreq;
-
-/// 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;
-}
+static uint16_t timeNCOFreq;
/**
* Initialize the real-time clock.
*/
-void timeInit()
+static 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;
-
- putchar ((timeNCO >> 8) < 0x80 ? 0xc0 : 0x40);
-
- timeNCO += timeNCOFreq;
-
- if (++timeLowRateCount == 8)
- {
- timeLowRateCount = 0;
- tnc1200TimerTick();
- } // END if
}
/** @} */
#define TNC_TX_DELAY 45
/// The size of the TNC output buffer.
-#define TNC_BUFFER_SIZE 80
+#define TNC_BUFFER_SIZE 40
/// States that define the current mode of the 1200 bps (A-FSK) state machine.
typedef enum
/// 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] = {
- 'A' << 1, 'P' << 1, 'R' << 1, 'S' << 1, ' ' << 1, ' ' << 1, 0x60, \
- 'K' << 1, 'D' << 1, '7' << 1, 'S' << 1, 'Q' << 1, 'G' << 1, 0x76, \
- 'G' << 1, 'A' << 1, 'T' << 1, 'E' << 1, ' ' << 1, ' ' << 1, 0x60, \
- 'W' << 1, 'I' << 1, 'D' << 1, 'E' << 1, '3' << 1, ' ' << 1, 0x67, \
+static const uint8_t TNC_AX25_HEADER[] = {
+ 'A' << 1, 'P' << 1, 'A' << 1, 'M' << 1, ' ' << 1, ' ' << 1, 0x60, \
+ 'K' << 1, 'D' << 1, '7' << 1, 'S' << 1, 'Q' << 1, 'G' << 1, 0x78, \
+ 'W' << 1, 'I' << 1, 'D' << 1, 'E' << 1, '2' << 1, ' ' << 1, 0x65, \
0x03, 0xf0 };
/// The next bit to transmit.
-uint8_t tncTxBit;
+static uint8_t tncTxBit;
/// Current mode of the 1200 bps state machine.
-TNC_TX_1200BPS_STATE tncMode;
+static TNC_TX_1200BPS_STATE tncMode;
/// Counter for each bit (0 - 7) that we are going to transmit.
-uint8_t tncBitCount;
+static uint8_t tncBitCount;
/// A shift register that holds the data byte as we bit shift it for transmit.
-uint8_t tncShift;
+static uint8_t tncShift;
/// Index into the APRS header and data array for each byte as we transmit it.
-uint8_t tncIndex;
+static uint8_t tncIndex;
/// The number of bytes in the message portion of the AX.25 message.
-uint8_t tncLength;
+static uint8_t tncLength;
/// A copy of the last 5 bits we've transmitted to determine if we need to bit stuff on the next bit.
-uint8_t tncBitStuff;
+static uint8_t tncBitStuff;
/// Pointer to TNC buffer as we save each byte during message preparation.
-uint8_t *tncBufferPnt;
+static uint8_t *tncBufferPnt;
/// Buffer to hold the message portion of the AX.25 packet as we prepare it.
-uint8_t tncBuffer[TNC_BUFFER_SIZE];
+static uint8_t tncBuffer[TNC_BUFFER_SIZE];
/**
* Initialize the TNC internal variables.
*/
-void tncInit()
+static void tncInit()
{
tncTxBit = 0;
tncMode = TNC_TX_READY;
* Method that is called every 833uS to transmit the 1200bps A-FSK data stream.
* The provides the pre and postamble as well as the bit stuffed data stream.
*/
-void tnc1200TimerTick()
+static void tnc1200TimerTick()
{
// Set the A-FSK frequency.
if (tncTxBit == 0x00)
}
/**
- * Generate the plain text position packet. Data is written through the tncTxByte
- * callback function
+ * Generate the plain text position packet.
*/
-void tncPositionPacket(void)
+static void tncPositionPacket(void)
{
int32_t latitude = 45.4694766 * 10000000;
int32_t longitude = -122.7376250 * 10000000;
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.
*
* @param dataMode enumerated type that specifies 1200bps A-FSK or 9600bps FSK
*/
-void tncTxPacket(void)
+void ao_aprs_send(void)
{
uint16_t crc;
+ timeInit();
+ tncInit();
+
// Set a pointer to our TNC output buffer.
tncBufferPnt = tncBuffer;
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);
-
- // 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