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/*
  Princeton PT2262
  A00    1      18 VCC          A0-A11 may be '1', '0' or 'f'
  A01    2      17 DOUT         - 0 high  4, low 12, high  4, low 12
  A02    3      16 OSC2         - 1 high 12, low  4, high 12, low  4
  A03    4      15 OSC1         - f high  4, low 12, high 12, low  4
  A04    5      14 /TE          - sync high for 4 then low for (128-4)
  A05    6      13 A11/D0       - code word is 12 bits then sync, A0 out first
  A06/D5 7      12 A10/D1       - code frame is 4 x code words
  A07/D4 8      11 A09/D2
  Vss    9      10 A08/D3

  Data is presented: 76 54 32 10|76  54  32  10|76  54  32  10|76  54  32  10
                     xx xx xx xx|A0  A1  A2  A3|A4  A5  A6  A7|A8  A9 A10 A11
  For each bit pair: 00 - 0 01 - 1
                     10 - f 11 - invalid
   <----- pulse cycle 0 (16U) -----> <----- pulse cycle 1 (16U) -------->
*/

static int bits[3][8] =
{
  {FTDI_BBTX, 0,         0,         0, FTDI_BBTX, 0,         0,         0},
  {FTDI_BBTX, FTDI_BBTX, FTDI_BBTX, 0, FTDI_BBTX, FTDI_BBTX, FTDI_BBTX, 0},
  {FTDI_BBTX, 0,         0,         0, FTDI_BBTX, FTDI_BBTX, FTDI_BBTX, 0}
};

enum
{
  PT2262_4U                                     = 6500 / RF_UDELAY,
  PT2262_FRAME                                  = 4,
  PT2262_REPEAT                                 = 1,
  PT2262_SYNC                                   = 32 * PT2262_4U
};

/* h is a handle to the FTDI device */
static je_t pt2262rf_write(void *h, const uint8_t *s, unsigned l, unsigned *c)
{
  int aa, n;
  unsigned i, j, k, m;
  uint32_t a;
  uint8_t b[FTDI_BBBUFF];
  je_t r;

  r = 0;
  for ( i = 0; !r && i < PT2262_REPEAT; i++ )
  {
    a = 0;
    for ( j = 0; !r && j < PT2262_FRAME; j++ )
    {
      for ( k = 1; !r && k < l; k++ )
      {
        for ( n = 6; !r && n >= 0; n -= 2)
        {
          for ( m = 0; !r && m < 8; m++ )
          {
            if ( (aa = ((s[k] >> n) & 0x03)) < 3 )
            {
              memset(b + a, bits[aa][m], PT2262_4U);
              a += PT2262_4U;
            }
            else
              r = E_ARGUMENTS;
          }
        }
      }
      memset(b + a, FTDI_BBTX, PT2262_4U);
      a += PT2262_4U;
      memset(b + a, 0, PT2262_SYNC - PT2262_4U);
      a += (PT2262_SYNC - PT2262_4U);
    }
    if ( !r )
      r = writeftdi(h, b, a);
  }
  if ( c )
    *c = l;
  return(r);
}