Add triple-press for skip back

src/avclandrv.c

@@ -218,8 +218,9 @@ ISR(TCA0_OVF_vect) { mic_timer_isr_body(false); }
 // Emulate a single play/pause button press on the source device.
 void AVCLAN_micPlayPause() { mic_pulse(1); }
 
-// Emulate a skip-forward button press: H / L / H.
+// Emulate skip-forward/backward button presses
-void AVCLAN_micSkip() { mic_pulse(3); }
+void AVCLAN_micSkipForward() { mic_pulse(3); }  //  double-press
+void AVCLAN_micSkipBackward() { mic_pulse(5); } // triple-press
 
 /* Disable non-read related interrupts (USART RX, PIT, TCA) during AVCLAN reads.
  */
@@ -1205,7 +1206,6 @@ response_t AVCLAN_handleframe(const AVCLAN_frame_t *in, AVCLAN_frame_t *out) {
         respond = r_Handled;
         break;
       case PACK3(dev_CMD_SW, dev_CD_CHANGER, Track_Seek_Up):
-        AVCLAN_micSkip();
         cd_status.state = cd_SEEKING_TRACK;
         if (cd_status.track < 98)
           ++cd_status.track;
@@ -1215,6 +1215,7 @@ response_t AVCLAN_handleframe(const AVCLAN_frame_t *in, AVCLAN_frame_t *out) {
         cd_status.secs = 0x7f;
         cd_status.flags2 = 0xc0;
         AVCLAN_generateStatus(out, true, dev_CMD_SW);
+        AVCLAN_micSkipForward();
         respond = r_TrackChange;
         break;
       case PACK3(dev_CMD_SW, dev_CD_CHANGER, Track_Seek_Down):
@@ -1230,6 +1231,7 @@ response_t AVCLAN_handleframe(const AVCLAN_frame_t *in, AVCLAN_frame_t *out) {
         cd_status.secs = 0x7f;
         cd_status.flags2 = 0xc0;
         AVCLAN_generateStatus(out, true, dev_CMD_SW);
+        AVCLAN_micSkipBackward();
         respond = r_TrackChange;
         break;
       case PACK3(dev_CMD_SW, dev_CD_CHANGER, Track_Fast_Forward): {
@@ -1240,7 +1242,7 @@ response_t AVCLAN_handleframe(const AVCLAN_frame_t *in, AVCLAN_frame_t *out) {
           ++cd_status.mins;
         }
         AVCLAN_generateStatus(out, true, dev_CMD_SW);
-        AVCLAN_micSkip();
+        AVCLAN_micSkipForward();
         resetStatusTimer(); // Skipped to a whole/round sec; ensure next tick is
                             // ~1 sec from now
         respond = r_Handled;
@@ -1260,6 +1262,7 @@ response_t AVCLAN_handleframe(const AVCLAN_frame_t *in, AVCLAN_frame_t *out) {
         } else
           cd_status.secs -= 15;
         AVCLAN_generateStatus(out, true, dev_CMD_SW);
+        AVCLAN_micSkipBackward();
         resetStatusTimer(); // Skipped to a whole/round sec; ensure next tick is
                             // ~1 sec from now
         respond = r_Handled;

src/avclandrv.h

@@ -226,7 +226,8 @@ void AVCLAN_normalizeState();
 #ifndef NDEBUG
 bool AVCLAN_micToggle();
 void AVCLAN_micPlayPause();
-void AVCLAN_micSkip();
+void AVCLAN_micSkipForward();
+void AVCLAN_micSkipBackward();
 bool AVCLAN_isMediaFunctioning();
 void AVCLan_Measure();
 #endif

src/sniffer.c

@@ -269,7 +269,13 @@ int main() {
           break;
         case 's':
           RS232_Print("Skip begin ... ");
-          AVCLAN_micSkip();
+          AVCLAN_micSkipForward();
+          while (AVCLAN_isMediaFunctioning()) {}
+          RS232_Print("end\n");
+          break;
+        case 'b':
+          RS232_Print("Skip back begin ... ");
+          AVCLAN_micSkipBackward();
           while (AVCLAN_isMediaFunctioning()) {}
           RS232_Print("end\n");
           break;
@@ -430,7 +436,8 @@ void print_help() {
               "g - Toggle MIC_CONTROL high/low\n"
               "p - double MIC play/pause pulse\n" // Confirm pulse function and
                                                   // refractory timing
-              "s - MIC skip pulse\n"
+              "s - MIC skip forward\n"
+              "b - MIC skip backward\n"
               "M - Measure bit-timing (pulse-widths and periods)\n"
 #endif
               "? - Print this message\n");