Added to radio driver interface two functions to enable and disable AF output towards the speaker

openrtx/include/interfaces/radio.h

@@ -84,6 +84,16 @@ void radio_setOpmode(const enum opmode mode);
  */
 bool radio_checkRxDigitalSquelch();
 
+/**
+ * Enable AF output towards the speakers.
+ */
+void radio_enableAfOutput();
+
+/**
+ * Disable AF output towards the speakers.
+ */
+void radio_disableAfOutput();
+
 /**
  * Enable the RX stage.
  */

platform/drivers/baseband/AT1846S.h

@@ -318,6 +318,24 @@ public:
         i2c_writeReg16(0x49, static_cast< uint16_t >(thresh));
     }
 
+    /**
+     * Mute the RX audio output while keeping the chip in RX mode.
+     */
+    inline void muteRxOutput()
+    {
+        // Setting bit 7 of register 0x30 mutes the RX audio output
+        maskSetRegister(0x30, 0x0080, 0x0080);
+    }
+
+    /**
+     * Unmute the RX audio output.
+     */
+    inline void unmuteRxOutput()
+    {
+        // Clearing bit 7 of register 0x30 unmutes the RX audio output
+        maskSetRegister(0x30, 0x0080, 0x0000);
+    }
+
 private:
 
     /**

platform/drivers/baseband/HR_C6000_UV3x0.cpp

@@ -171,7 +171,6 @@ void HR_Cx000< M >::fmMode()
     writeReg(M::CONFIG, 0x01, 0xB0);    // Swap TX IQ, two point mode for TX, IF mode for RX
     writeReg(M::CONFIG, 0x81, 0x04);    // Interrupt mask
     writeReg(M::CONFIG, 0xE5, 0x1A);    // Undocumented register
-    writeReg(M::CONFIG, 0x36, 0x02);    // Enable voice channel in FM mode
     writeReg(M::CONFIG, 0xE4, 0x27);    // Lineout gain, first and second stage mic gain
     writeReg(M::CONFIG, 0xE2, 0x06);    // Mic preamp disabled, anti-pop enabled
     writeReg(M::CONFIG, 0x34, 0x98);    // FM bpf enabled, 25kHz bandwidth

platform/drivers/baseband/radio_GDx.cpp

@@ -79,10 +79,12 @@ void radio_init(const rtxStatus_t *rtxState)
                |  DAC_C0_DACEN_MASK;    // Enable DAC
 
     /*
-     * Enable and configure both AT1846S and HR_C6000
+     * Enable and configure both AT1846S and HR_C6000, keep AF output disabled
+     * at power on.
      */
     at1846s.init();
     C6000.init();
+    radio_disableAfOutput();
 }
 
 void radio_terminate()
@@ -132,6 +134,17 @@ bool radio_checkRxDigitalSquelch()
     return at1846s.rxCtcssDetected();
 }
 
+void radio_enableAfOutput()
+{
+    // TODO: AF output management for DMR mode
+    at1846s.unmuteRxOutput();
+}
+
+void radio_disableAfOutput()
+{
+    at1846s.muteRxOutput();
+}
+
 void radio_enableRx()
 {
     gpio_clearPin(VHF_LNA_EN);

platform/drivers/baseband/radio_MD3x0.cpp

@@ -110,15 +110,14 @@ void radio_init(const rtxStatus_t *rtxState)
     gpio_setMode(RF_APC_SW, OUTPUT);
     gpio_setMode(TX_STG_EN, OUTPUT);
     gpio_setMode(RX_STG_EN, OUTPUT);
-
-    gpio_setMode(FM_MUTE,  OUTPUT);
-    gpio_clearPin(FM_MUTE);
+    gpio_setMode(FM_MUTE,   OUTPUT);
 
     gpio_clearPin(PLL_PWR);    // PLL off
     gpio_setPin(VCOVCC_SW);    // VCOVCC high enables RX VCO, TX VCO if low
     #ifndef MDx_ENABLE_SWD
     gpio_setPin(WN_SW);        // 25kHz bandwidth
     #endif
+    gpio_clearPin(FM_MUTE);    // Mute FM AF output
     gpio_clearPin(DMR_SW);     // Disconnect HR_C5000 input IF signal and audio out
     gpio_clearPin(FM_SW);      // Disconnect analog FM audio path
     gpio_clearPin(RF_APC_SW);  // Disable TX power control
@@ -229,6 +228,17 @@ bool radio_checkRxDigitalSquelch()
     return false;
 }
 
+void radio_enableAfOutput()
+{
+    // TODO: AF output management for DMR mode
+    gpio_setPin(FM_MUTE);
+}
+
+void radio_disableAfOutput()
+{
+    gpio_clearPin(FM_MUTE);
+}
+
 void radio_enableRx()
 {
     gpio_clearPin(TX_STG_EN);          // Disable TX PA
@@ -252,12 +262,6 @@ void radio_enableRx()
     DAC->DHR12L1 = vtune_rx * 0xFF;
 
     gpio_setPin(RX_STG_EN);            // Enable RX LNA
-
-    if(config->opMode == OPMODE_FM)
-    {
-        gpio_setPin(FM_MUTE);          // In FM mode, unmute audio path towards speaker
-    }
-
     radioStatus = RX;
 }
 

platform/drivers/baseband/radio_MD9600.cpp

@@ -46,6 +46,16 @@ bool radio_checkRxDigitalSquelch()
     return false;
 }
 
+void radio_enableAfOutput()
+{
+
+}
+
+void radio_disableAfOutput()
+{
+
+}
+
 void radio_enableRx()
 {
 

platform/drivers/baseband/radio_Mod17.cpp

@@ -52,6 +52,16 @@ bool radio_checkRxDigitalSquelch()
     return false;
 }
 
+void radio_enableAfOutput()
+{
+
+}
+
+void radio_disableAfOutput()
+{
+
+}
+
 void radio_enableRx()
 {
     radioStatus = RX;

platform/drivers/baseband/radio_UV3x0.cpp

@@ -84,10 +84,11 @@ void radio_init(const rtxStatus_t *rtxState)
     DAC->DHR12R1 = 0;
 
     /*
-     * Configure AT1846S and HR_C6000
+     * Configure AT1846S and HR_C6000, keep AF output disabled at power on.
      */
     at1846s.init();
     C6000.init();
+    radio_disableAfOutput();
 }
 
 void radio_terminate()
@@ -141,6 +142,18 @@ bool radio_checkRxDigitalSquelch()
     return at1846s.rxCtcssDetected();
 }
 
+void radio_enableAfOutput()
+{
+    // Bit 2 of register 0x36: enable voice channel in FM mode
+    // TODO: AF output management for DMR mode
+    C6000.writeCfgRegister(0x36, 0x02);
+}
+
+void radio_disableAfOutput()
+{
+    C6000.writeCfgRegister(0x36, 0x00);
+}
+
 void radio_enableRx()
 {
     gpio_clearPin(PA_EN_1);