Enabled M17 support also in MD-UV3x0 radio driver

platform/drivers/baseband/HR_C6000_UV3x0.cpp

@@ -205,7 +205,7 @@ void HR_Cx000< M >::startAnalogTx(const TxAudioSource source, const FmConfig cfg
     if(source == TxAudioSource::LINE_IN) audioCfg |= 0x02;
 
     writeReg(M::CONFIG, 0xE2, 0x00);    // Mic preamp disabled, anti-pop disabled
-    writeReg(M::CONFIG, 0xE4, 0x23);    // Lineout gain, first and second stage mic gain
+//     writeReg(M::CONFIG, 0xE4, 0x23);    // Lineout gain, first and second stage mic gain
     writeReg(M::CONFIG, 0xC2, 0x00);    // Codec AGC gain
     writeReg(M::CONFIG, 0xA1, 0x80);    // FM_mod, all modes cleared
     writeReg(M::CONFIG, 0x83, 0xFF);    // Clear all interrupt flags

platform/drivers/baseband/radio_UV3x0.cpp

@@ -113,8 +113,9 @@ void radio_setOpmode(const enum opmode mode)
     switch(mode)
     {
         case FM:
-            at1846s.setOpMode(AT1846S_OpMode::FM);
-            C6000.fmMode();
+            at1846s.setOpMode(AT1846S_OpMode::FM);  // AT1846S in FM mode
+            C6000.fmMode();                         // HR_C6000 in FM mode
+            C6000.setInputGain(-3);                 // Input gain in dB, as per TYT firmware
             break;
 
         case DMR:
@@ -123,7 +124,9 @@ void radio_setOpmode(const enum opmode mode)
             break;
 
         case M17:
-            // TODO
+            at1846s.setOpMode(AT1846S_OpMode::DMR); // AT1846S in DMR mode, disables RX filter
+            C6000.fmMode();                         // HR_C6000 in FM mode
+            C6000.setInputGain(+3);                 // Input gain in dB, found experimentally
             break;
 
         default:

platform/targets/MD-UV3x0/platform.c

@@ -24,6 +24,7 @@
 #include <ADC1_MDx.h>
 #include <calibInfo_MDx.h>
 #include <interfaces/nvmem.h>
+#include <toneGenerator_MDx.h>
 #include <interfaces/rtc.h>
 #include <interfaces/audio.h>
 #include <chSelector.h>
@@ -56,6 +57,7 @@ void platform_init()
     nvm_init();                      /* Initialise non volatile memory manager */
     nvm_readCalibData(&calibration); /* Load calibration data                  */
     nvm_loadHwInfo(&hwInfo);         /* Load hardware information data         */
+    toneGen_init();                  /* Initialise tone generator              */
     rtc_init();                      /* Initialise RTC                         */
     chSelector_init();               /* Initialise channel selector handler    */
     audio_init();                    /* Initialise audio management module     */
@@ -85,6 +87,7 @@ void platform_terminate()
     adc1_terminate();
     nvm_terminate();
     rtc_terminate();
+    toneGen_terminate();
     chSelector_terminate();
     audio_terminate();