L2SDP-489, with review comments.

src/constants.h

@@ -34,6 +34,7 @@
 #define C_S_pn 12
 #define C_W_adc 14
 #define C_F_adc 200E6
+#define C_T_adc (1 / C_F_adc)
 
 #define C_WG_MODE_OFF  0
 #define C_WG_MODE_CALC 1

src/periph/fpga.cpp

@@ -1441,7 +1441,7 @@ bool Periph_fpga::write_xst_processing_enable(const char *data)
         if (retval == true) {
             start_bsn = (((uint64_t)reg[1] << 32) + reg[0]);
             cout << "bsn=" << to_string(start_bsn) << endl;
-            start_bsn = start_bsn + 2 * C_F_adc / C_N_fft;
+            start_bsn = start_bsn + (2 * C_F_adc) / C_N_fft;
             cout << "new bsn=" << to_string(start_bsn) << endl;
             reg[0] = (uint32_t)(start_bsn & 0xffffffff);
             reg[1] = (uint32_t)((start_bsn >> 32) & 0xffffffff);
@@ -1467,7 +1467,7 @@ bool Periph_fpga::read_xst_integration_interval(TermOutput& termout, int format)
     uint32_t data[20];
     memset((void *)data, 0, sizeof(data));
     retval = Read("mm/0/REG_BSN_SYNC_SCHEDULER_XSUB/0/ctrl_interval_size", data);
-    double interval = (double)data[0] / C_F_adc;
+    double interval = (double)data[0] * C_T_adc;
 
     double *_ptr = (double *)termout.val;
     *_ptr = interval;
@@ -1507,7 +1507,7 @@ bool Periph_fpga::read_xst_input_sync_at_bsn(TermOutput& termout, int format, in
     bool retval = true;
     int64_t bsn = my_xst_input_bsn_at_sync;
     if (mode == R_UCP) {
-        uint32_t data[20];
+        uint32_t data[2];
         memset((void *)data, 0, sizeof(data));
         string regname;
         regname = "mm/0/REG_BSN_SYNC_SCHEDULER_XSUB/0/mon_input_bsn_at_sync";
@@ -1526,7 +1526,7 @@ bool Periph_fpga::read_xst_output_sync_bsn(TermOutput& termout, int format, int
     bool retval = true;
     int64_t bsn = my_xst_output_sync_bsn;
     if (mode == R_UCP) {
-        uint32_t data[20];
+        uint32_t data[2];
         memset((void *)data, 0, sizeof(data));
         string regname;
         regname = "mm/0/REG_BSN_SYNC_SCHEDULER_XSUB/0/mon_output_sync_bsn";