ttwrplus: disable Tx in menus

As T-TWR Plus reuses the PTT as a back button, thus we need to disable
PTT in menus. Also enforce rx_only logic from CPS.

TG-553

openrtx/include/core/state.h

@@ -59,6 +59,7 @@ typedef struct
     bool       backup_eflash;
     bool       restore_eflash;
     char       m17_dest[10];
+    bool       txDisable;
 }
 state_t;
 

openrtx/src/core/cps.c

@@ -32,6 +32,7 @@ channel_t cps_getDefaultChannel()
     #endif
     channel.bandwidth = BW_25;
     channel.power     = 100;    // 1W, P = 10dBm + n*0.2dBm, we store n
+    channel.rx_only   = false;  // Enable tx by default
 
     // Set initial frequency based on supported bands
     const hwInfo_t* hwinfo  = platform_getHwInfo();

openrtx/src/core/state.c

@@ -71,6 +71,7 @@ void state_init()
     state.bank_enabled  = false;
     state.rtxStatus     = RTX_OFF;
     state.emergency     = false;
+    state.txDisable     = false;
 
     // Force brightness field to be in range 0 - 100
     if(state.settings.brightness > 100)

openrtx/src/core/threads.c

@@ -100,7 +100,10 @@ void *ui_threadFunc(void *arg)
             rtx_cfg.txToneEn    = state.channel.fm.txToneEn;
             rtx_cfg.txTone      = ctcss_tone[state.channel.fm.txTone];
 
-            // Copy new M17 CAN, M17 CAN RX check,source and destination addresses
+            // Enable Tx if channel allows it and we are in UI main screen
+            rtx_cfg.txDisable = state.channel.rx_only || state.txDisable;
+
+            // Copy new M17 CAN, source and destination addresses
             rtx_cfg.can = state.settings.m17_can;
             rtx_cfg.canRxEn = state.settings.m17_can_rx;
             strncpy(rtx_cfg.source_address,      state.settings.callsign, 10);

openrtx/src/ui/default/ui.c

@@ -1324,6 +1324,12 @@ void ui_updateFSM(bool *sync_rtx)
         {
             // VFO screen
             case MAIN_VFO:
+                // Enable Tx in MAIN_VFO mode
+                if (state.txDisable)
+                {
+                    state.txDisable = false;
+                    *sync_rtx = true;
+                }
                 // M17 Destination callsign input
                 if(ui_state.edit_mode)
                 {
@@ -1494,6 +1500,12 @@ void ui_updateFSM(bool *sync_rtx)
                 break;
             // MEM screen
             case MAIN_MEM:
+                // Enable Tx in MAIN_MEM mode
+                if (state.txDisable)
+                {
+                    state.txDisable = false;
+                    *sync_rtx = true;
+                }
                 // M17 Destination callsign input
                 if(ui_state.edit_mode)
                 {
@@ -2141,6 +2153,14 @@ void ui_updateFSM(bool *sync_rtx)
                 }
                 break;
         }
+
+        // Enable Tx only if in MAIN_VFO or MAIN_MEM states
+        bool inMemOrVfo = (state.ui_screen == MAIN_VFO) || (state.ui_screen == MAIN_MEM);
+        if ((macro_menu == true) || ((inMemOrVfo == false) && (state.txDisable == false)))
+        {
+            state.txDisable = true;
+            *sync_rtx = true;
+        }
         if (!f1Handled && (msg.keys & KEY_F1) && (state.settings.vpLevel > vpBeep))
         {
             vp_replayLastPrompt();