Fix very strange bug, on band 2

!!!!! Don`t understand why si5351 non stable on band 2 then change from band 3
It fixed if set before sweep one frequency from band 1 (for example 50MHz)
Possibly problem in tlv320aic3204_set_gain, call only si5351_set_frequency_with_offset not work

Little faster call command from shell

Fix interpolation if points < POINTS_COUNT

main.c

@@ -120,6 +120,8 @@ static THD_FUNCTION(Thread1, arg)
     if (shell_function){
       shell_function(shell_nargs-1, &shell_args[1]);
       shell_function = 0;
+      osalThreadSleepMilliseconds(10);
+      continue;
     }
     // Process UI inputs
     ui_process();
@@ -802,11 +804,18 @@ bool sweep(bool break_on_operation)
   // blink LED while scanning
   palClearPad(GPIOC, GPIOC_LED);
   // Power stabilization after LED off, also align timings on i == 0
+
+  // !!!!! Don`t understand why si5351 non stable on band 2 then change from band 3
+  // It fixed if set before one band 1 frequency
+  // Possibly problem in gain, call only si5351_set_frequency_with_offset not work
+  // Also it allow align sweep timings
+  set_frequency(50000000);
+  DSP_START(1);DSP_WAIT_READY;
   for (i = 0; i < sweep_points; i++) {         // 5300
     if (frequencies[i] == 0) break;
     delay = set_frequency(frequencies[i]);     // 700
     tlv320aic3204_select(0);                   // 60 CH0:REFLECT, reset and begin measure
-    DSP_START(delay+((i==0)?2:0));             // 1900
+    DSP_START(delay);                          // 1900
     //================================================
     // Place some code thats need execute while delay
     //================================================
@@ -1359,7 +1368,7 @@ cal_interpolate(int s)
   j = 0;
   for (; i < sweep_points; i++) {
     uint32_t f = frequencies[i];
-
+    if (f == 0) goto interpolate_finish;
     for (; j < src->_sweep_points-1; j++) {
       if (src->_frequencies[j] <= f && f < src->_frequencies[j+1]) {
         // found f between freqs at j and j+1
@@ -1388,11 +1397,11 @@ cal_interpolate(int s)
   for (; i < sweep_points; i++) {
     // fill cal_data at tail of src
     for (eterm = 0; eterm < 5; eterm++) {
-      cal_data[eterm][i][0] = src->_cal_data[eterm][sweep_points-1][0];
+      cal_data[eterm][i][0] = src->_cal_data[eterm][src->_sweep_points-1][0];
-      cal_data[eterm][i][1] = src->_cal_data[eterm][sweep_points-1][1];
+      cal_data[eterm][i][1] = src->_cal_data[eterm][src->_sweep_points-1][1];
     }
   }
-    
+interpolate_finish:
   cal_status |= src->_cal_status | CALSTAT_APPLY | CALSTAT_INTERPOLATED;
   redraw_request |= REDRAW_CAL_STATUS;
 }
@@ -2184,8 +2193,8 @@ static void VNAShell_executeLine(char *line){
         shell_function= scp->sc_function;
         // Wait execute command in sweep thread
         do{
-          osalThreadSleepMilliseconds(100);}
+          osalThreadSleepMilliseconds(100);
-        while(shell_function);
+        } while(shell_function);
       }
       else
         scp->sc_function(shell_nargs-1, &shell_args[1]);

si5351.c

@@ -65,13 +65,26 @@ si5351_bulk_write(const uint8_t *buf, int len)
   (void)i2cMasterTransmitTimeout(&I2CD1, SI5351_I2C_ADDR, buf, len, NULL, 0, 1000);
   i2cReleaseBus(&I2CD1);
 }
+
 #if 0
-static void si5351_bulk_read(uint8_t reg, uint8_t* buf, int len)
+static bool si5351_bulk_read(uint8_t reg, uint8_t* buf, int len)
 {
-  int addr = SI5351_I2C_ADDR>>1;
   i2cAcquireBus(&I2CD1);
-  msg_t mr = i2cMasterTransmitTimeout(&I2CD1, addr, &reg, 1, buf, len, 1000);
+  msg_t mr = i2cMasterTransmitTimeout(&I2CD1, SI5351_I2C_ADDR, &reg, 1, buf, len, 1000);
   i2cReleaseBus(&I2CD1);
+  return mr == MSG_OK;
+}
+
+static void si5351_wait_pll_lock(void)
+{
+  uint8_t status;
+  int count = 100;
+  do{
+    status=0xFF;
+    si5351_bulk_read(0, &status, 1);
+    if ((status & 0x60) == 0) // PLLA and PLLB locked
+      return;
+  }while (--count);
 }
 #endif