Arduino 9833 Test Code

#include <SPI.h>
#include <MD_AD9833.h>

// Pins for SPI comm with the AD9833 IC
#define DATA  11    ///< SPI Data pin number
#define CLK   13    ///< SPI Clock pin number
#define FSYNC 10    ///< SPI Load pin number (FSYNC in AD9833 usage)

MD_AD9833   AD(FSYNC); // Hardware SPI
//MD_AD9833 AD(DATA, CLK, FSYNC); // Arbitrary SPI pins

// Character constants for commands
const char CMD_HELP = '?';
const char BLANK = ' ';
const char PACKET_START = ':';
const char PACKET_END = ';';
const char CMD_FREQ = 'F';
const char CMD_PHASE = 'P';
const char CMD_OUTPUT = 'O';
const char OPT_FREQ = 'F';
const char OPT_PHASE = 'P';
const char OPT_SIGNAL = 'S';
const char OPT_1 = '1';
const char OPT_2 = '2';
const char OPT_MODULATE = 'M';
const uint8_t PACKET_SIZE = 20;

void setup()
{
  Serial.begin(57600);
  AD.begin();
  usage();
}

void usage(void)
{
  Serial.print(F("\n\n[MD_AD9833_Tester]"));
  Serial.print(F("\n?\thelp - this message"));
  Serial.print(F("\n\n:<cmd><opt> <param>;"));
  Serial.print(F("\n:f1n;\tset frequency 1 to n Hz"));
  Serial.print(F("\n:f2n;\tset frequency 2 to n Hz"));
  Serial.print(F("\n:fmn;\tset frequency modulation to n Hz"));
  Serial.print(F("\n:p1n;\tset phase 1 to n in tenths of a degree (1201 is 120.1 deg)"));
  Serial.print(F("\n:p2n;\tset phase 2 to n in tenths of a degree (1201 is 120.1 deg)"));
  Serial.print(F("\n:ofn;\toutput frequency n or modulation [n=1/2/m]"));
  Serial.print(F("\n:opn;\toutput phase n or modulation [n=1/2/m]"));
  Serial.print(F("\n:osn;\toutput signal type n [n=(o)ff/(s)ine/(t)riangle/s(q)uare]"));
}

uint8_t htoi(char c)
{
  c = toupper(c);

  if (c >= '0' && c <= '9')
      return(c - '0');
  else if (c >= 'A' && c <= 'F')
      return(c - 'A' + 10);
  else
      return(0);
}

char nextChar(void)
// Read the next character from the serial input stream
// Blocking wait
{
  while (!Serial.available())
    ; /* do nothing */
  return(toupper(Serial.read()));
}

char *readPacket(void)
// read a packet and return the
{
  static enum { S_IDLE, S_READ_CMD, S_READ_MOD, S_READ_PKT } state = S_IDLE;
  static char cBuf[PACKET_SIZE + 1];
  static char *cp;
  char c;

  switch (state)
  {
  case S_IDLE:   // waiting for packet start
    c = nextChar();
    if (c == CMD_HELP)
    {
      usage();
      break;
    }
    if (c == PACKET_START)
    {
      cp = cBuf;
      state = S_READ_CMD;
    }
    break;

  case S_READ_CMD:   // waiting for command char
    c = nextChar();
    if (c == CMD_FREQ || c == CMD_PHASE || c == CMD_OUTPUT)
    {
      *cp++ = c;
      state = S_READ_MOD;
    }
    else
      state = S_IDLE;
    break;

  case S_READ_MOD: // Waiting for command modifier
    c = nextChar();
    if (c == OPT_FREQ || c == OPT_PHASE || c == OPT_SIGNAL ||
      c == OPT_1 || c == OPT_2 || c == OPT_MODULATE)
    {
      *cp++ = c;
      state = S_READ_PKT;
    }
    else
      state = S_IDLE;
    break;

  case S_READ_PKT: // Reading parameter until packet end
    c = nextChar();
    if (c == PACKET_END)
    {
      *cp = '\0';
      state = S_IDLE;
      return(cBuf);
    }
    *cp++ = c;
    break;

  default:
    state = S_IDLE;
    break;
  }

  return(NULL);
}

void processPacket(char *cp)
// Assume we have a correctly formed packet from the pasing in readPacket()
{
  uint32_t  ul;
  MD_AD9833::channel_t chan;
  MD_AD9833::mode_t mode;

  switch (*cp++)
  {
  case CMD_FREQ:
    switch (*cp++)
    {
    case OPT_1: chan = MD_AD9833::CHAN_0; break;
    case OPT_2: chan = MD_AD9833::CHAN_1; break;
    case OPT_MODULATE: /* do something in future */ break;
    }

    ul = strtoul(cp, NULL, 10);
    AD.setFrequency(chan, ul);
    break;

  case CMD_PHASE:
    switch (*cp++)
    {
    case OPT_1: chan = MD_AD9833::CHAN_0; break;
    case OPT_2: chan = MD_AD9833::CHAN_1; break;
    }

    ul = strtoul(cp, NULL, 10);
    AD.setPhase(chan, (uint16_t)ul);
    break;

  case CMD_OUTPUT:
    switch (*cp++)
    {
    case OPT_FREQ:
      switch (*cp)
      {
      case OPT_1: chan = MD_AD9833::CHAN_0; break;
      case OPT_2: chan = MD_AD9833::CHAN_1; break;
      case OPT_MODULATE: /* do something in future */ break;
      }
      AD.setActiveFrequency(chan);
      break;

    case OPT_PHASE:
      switch (*cp)
      {
      case OPT_1: chan = MD_AD9833::CHAN_0; break;
      case OPT_2: chan = MD_AD9833::CHAN_1; break;
      case OPT_MODULATE: /* do something in future */ break;
      }
      AD.setActivePhase(chan);
      break;

    case OPT_SIGNAL:
      switch (*cp)
      {
      case 'O': mode = MD_AD9833::MODE_OFF;    break;
      case 'S': mode = MD_AD9833::MODE_SINE;   break;
      case 'T': mode = MD_AD9833::MODE_TRIANGLE;  break;
      case 'Q': mode = MD_AD9833::MODE_SQUARE1;  break;
      }
      AD.setMode(mode);
      break;
    }
    break;
  }

  return;
}


void loop()
{
  char  *cp;

  if ((cp = readPacket()) != NULL)
    processPacket(cp);
}