enhancement: adjust delay

main.c

@@ -258,42 +258,48 @@ static void cmd_reset(BaseSequentialStream *chp, int argc, char *argv[])
       ;
 }
 
+#define DELAY_ON_GAIN_CHANGE 3
+
 int set_frequency(int freq)
 {
-    int delay = 0;
+    bool gain_changed = false;
     if (frequency == freq)
-      return delay;
+      return 0;
 
     if (freq > 1400000000 && frequency <= 1400000000) {
       tlv320aic3204_set_gain(95, 95);
-      delay += 10;
+      gain_changed = true;
     } else
     if (freq > 1200000000 && frequency <= 1200000000) {
       tlv320aic3204_set_gain(85, 85);
-      delay += 10;
+      gain_changed = true;
     } else
     if (freq > 900000000 && frequency <= 900000000) {
       tlv320aic3204_set_gain(75, 75);
-      delay += 10;
+      gain_changed = true;
     } else
     if (freq > 600000000 && frequency <= 600000000) {
       tlv320aic3204_set_gain(50, 50);
-      delay += 10;
+      gain_changed = true;
     } else
     if (freq > FREQ_HARMONICS && frequency <= FREQ_HARMONICS) {
       tlv320aic3204_set_gain(40, 40);
-      delay += 10;
+      gain_changed = true;
     } else
     if (freq <= FREQ_HARMONICS && frequency > FREQ_HARMONICS) {
       tlv320aic3204_set_gain(0, 0);
-      delay += 10;
+      gain_changed = true;
     }
 
     int8_t ds = drive_strength;
     if (ds == DRIVE_STRENGTH_AUTO) {
       ds = freq > FREQ_HARMONICS ? SI5351_CLK_DRIVE_STRENGTH_8MA : SI5351_CLK_DRIVE_STRENGTH_2MA;
     }
-    delay += si5351_set_frequency_with_offset(freq, frequency_offset, ds);
+
+    int delay = si5351_set_frequency_with_offset(freq, frequency_offset, ds);
+    if (gain_changed && delay < DELAY_ON_GAIN_CHANGE) {
+      delay = DELAY_ON_GAIN_CHANGE;
+    }
 
     frequency = freq;
     return delay;
@@ -642,6 +648,8 @@ ensure_edit_config(void)
   cal_status = 0;
 }
 
+#define DELAY_CHANNEL_CHANGE 1
+
 // main loop for measurement
 bool sweep(bool break_on_operation)
 {
@@ -659,7 +667,7 @@ bool sweep(bool break_on_operation)
     (*sample_func)(measured[0][i]);
 
     tlv320aic3204_select_in1(); // CH1:TRANSMISSION
-    wait_dsp(delay);
+    wait_dsp(delay + DELAY_CHANNEL_CHANGE);
 
     /* calculate transmission coeficient */
     (*sample_func)(measured[1][i]);

si5351.c

@@ -295,6 +295,10 @@ si5351_set_frequency(int channel, int freq, uint8_t drive_strength)
 
 int current_band = -1;
 
+#define DELAY_NORMAL 1
+#define DELAY_BANDCHANGE 1
+#define DELAY_LOWBAND 1
+
 /*
  * configure output as follows:
  * CLK0: frequency + offset
@@ -306,7 +310,7 @@ int
 si5351_set_frequency_with_offset(int freq, int offset, uint8_t drive_strength)
 {
   int band;
-  int delay = 3;
+  int delay = DELAY_NORMAL;
   uint32_t ofreq = freq + offset;
   uint32_t rdiv = SI5351_R_DIV_1;
   if (freq > 900000000) {
@@ -388,8 +392,10 @@ si5351_set_frequency_with_offset(int freq, int offset, uint8_t drive_strength)
 #if 1
     si5351_enable_output();
 #endif
-    delay += 10;
+    delay += DELAY_BANDCHANGE;
   }
+  if (band == 0)
+    delay += DELAY_LOWBAND;
 
   current_band = band;
   return delay;