}
//-----------------------------------------------------------------------------
-// Set up the synchronous serial port, with the one set of options that we
-// always use when we are talking to the FPGA. Both RX and TX are enabled.
+// Set up the synchronous serial port with the set of options that fits
+// the FPGA mode. Both RX and TX are always enabled.
//-----------------------------------------------------------------------------
-void FpgaSetupSsc(void)
+void FpgaSetupSsc(uint8_t FPGA_mode)
{
// First configure the GPIOs, and get ourselves a clock.
AT91C_BASE_PIOA->PIO_ASR =
// on RX clock rising edge, sampled on falling edge
AT91C_BASE_SSC->SSC_RCMR = SSC_CLOCK_MODE_SELECT(1) | SSC_CLOCK_MODE_START(1);
- // 8 bits per transfer, no loopback, MSB first, 1 transfer per sync
+ // 8, 16 or 32 bits per transfer, no loopback, MSB first, 1 transfer per sync
// pulse, no output sync
- AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
+ if ((FPGA_mode & 0xe0) == FPGA_MAJOR_MODE_HF_READER_RX_XCORR) {
+ AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(16) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
+ } else {
+ AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0);
+ }
- // clock comes from TK pin, no clock output, outputs change on falling
+ // TX clock comes from TK pin, no clock output, outputs change on falling
// edge of TK, sample on rising edge of TK, start on positive-going edge of sync
AT91C_BASE_SSC->SSC_TCMR = SSC_CLOCK_MODE_SELECT(2) | SSC_CLOCK_MODE_START(5);
// ourselves, not to another buffer). The stuff to manipulate those buffers
// is in apps.h, because it should be inlined, for speed.
//-----------------------------------------------------------------------------
-bool FpgaSetupSscDma(uint8_t *buf, int len)
+bool FpgaSetupSscDma(uint8_t *buf, uint16_t sample_count)
{
if (buf == NULL) return false;
- AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; // Disable DMA Transfer
- AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) buf; // transfer to this memory address
- AT91C_BASE_PDC_SSC->PDC_RCR = len; // transfer this many bytes
- AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) buf; // next transfer to same memory address
- AT91C_BASE_PDC_SSC->PDC_RNCR = len; // ... with same number of bytes
- AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN; // go!
-
+ AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; // Disable DMA Transfer
+ AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) buf; // transfer to this memory address
+ AT91C_BASE_PDC_SSC->PDC_RCR = sample_count; // transfer this many samples
+ AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) buf; // next transfer to same memory address
+ AT91C_BASE_PDC_SSC->PDC_RNCR = sample_count; // ... with same number of samples AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN; // go!
+ AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN; // go!
return true;
}