AFC in Dstar enabled by default. Adding support for positive initial offset for AFC

ADF7021.cpp

@@ -173,7 +173,7 @@ void CIO::ifConf()
   }
 
   if(m_dstarEnable)
-    AFC_OFFSET = AFC_OFFSET_DSTAR;
+    AFC_OFFSET = 0;
   else if(m_dmrEnable)
     AFC_OFFSET = AFC_OFFSET_DMR;
   else if(m_ysfEnable)

ADF7021.h

@@ -78,21 +78,25 @@ www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
 #define ADF7021_REG6             0x05070E16
 
 // AFC configuration (REG 10)
-#if defined(ADF7021_ENABLE_AFC)
 #define ADF7021_REG10_DSTAR      0x0C96473A
+
+#if defined(ADF7021_ENABLE_4FSK_AFC)
 #define ADF7021_REG10_DMR        0x049E473A
 #define ADF7021_REG10_YSF        0x049E473A
 #define ADF7021_REG10_P25        0x049E473A
-#define AFC_OFFSET_DSTAR         0
+#if defined(ADF7021_AFC_POS)
+#define AFC_OFFSET_DMR           -1000
+#define AFC_OFFSET_YSF           -1000
+#define AFC_OFFSET_P25           -1000
+#else
 #define AFC_OFFSET_DMR           1000
 #define AFC_OFFSET_YSF           1000
 #define AFC_OFFSET_P25           1000
+#endif
 #else
-#define ADF7021_REG10_DSTAR      0x0496472A
 #define ADF7021_REG10_DMR        0x049E472A
 #define ADF7021_REG10_YSF        0x049E472A
 #define ADF7021_REG10_P25        0x049E472A
-#define AFC_OFFSET_DSTAR         0
 #define AFC_OFFSET_DMR           0
 #define AFC_OFFSET_YSF           0
 #define AFC_OFFSET_P25           0
@@ -142,21 +146,25 @@ www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
 #define ADF7021_REG6             0x050972C6
 
 // AFC (REG 10)
-#if defined(ADF7021_ENABLE_AFC)
 #define ADF7021_REG10_DSTAR      0x0C96355A
+
+#if defined(ADF7021_ENABLE_4FSK_AFC)
 #define ADF7021_REG10_DMR        0x049E355A
 #define ADF7021_REG10_YSF        0x049E355A
 #define ADF7021_REG10_P25        0x049E355A
-#define AFC_OFFSET_DSTAR         0
+#if defined(ADF7021_AFC_POS)
+#define AFC_OFFSET_DMR           -1000
+#define AFC_OFFSET_YSF           -1000
+#define AFC_OFFSET_P25           -1000
+#else
 #define AFC_OFFSET_DMR           1000
 #define AFC_OFFSET_YSF           1000
 #define AFC_OFFSET_P25           1000
+#endif
 #else
-#define ADF7021_REG10_DSTAR      0x0496354A
 #define ADF7021_REG10_DMR        0x049E354A
 #define ADF7021_REG10_YSF        0x049E354A
 #define ADF7021_REG10_P25        0x049E354A
-#define AFC_OFFSET_DSTAR         0
 #define AFC_OFFSET_DMR           0
 #define AFC_OFFSET_YSF           0
 #define AFC_OFFSET_P25           0
@@ -206,21 +214,25 @@ www.analog.com/media/en/technical-documentation/data-sheets/ADF7021.pdf
 #define ADF7021_REG6             0x0505EBB6
 
 // AFC (REG 10)
-#if defined(ADF7021_ENABLE_AFC)
 #define ADF7021_REG10_DSTAR      0x0C96557A
+
+#if defined(ADF7021_ENABLE_4FSK_AFC)
 #define ADF7021_REG10_DMR        0x049E557A
 #define ADF7021_REG10_YSF        0x049E557A
 #define ADF7021_REG10_P25        0x049E557A
-#define AFC_OFFSET_DSTAR         0
+#if defined(ADF7021_AFC_POS)
+#define AFC_OFFSET_DMR           -1000
+#define AFC_OFFSET_YSF           -1000
+#define AFC_OFFSET_P25           -1000
+#else
 #define AFC_OFFSET_DMR           1000
 #define AFC_OFFSET_YSF           1000
 #define AFC_OFFSET_P25           1000
+#endif
 #else
-#define ADF7021_REG10_DSTAR      0x0496556A
 #define ADF7021_REG10_DMR        0x049E556A
 #define ADF7021_REG10_YSF        0x049E556A
 #define ADF7021_REG10_P25        0x049E556A
-#define AFC_OFFSET_DSTAR         0
 #define AFC_OFFSET_DMR           0
 #define AFC_OFFSET_YSF           0
 #define AFC_OFFSET_P25           0

Config.h

@@ -41,8 +41,12 @@
 // Original 19.68 MHz, not working, only for experimentation:
 // #define ADF7021_19_6800
 
-// Enable AFC support for ADF7021
-// #define ADF7021_ENABLE_AFC
+// AFC is enabled by default in D-Star
+
+// Enable AFC support for DMR, YSF and P25 (experimental)
+// #define ADF7021_ENABLE_4FSK_AFC
+// Configure AFC with positive initial frequency offset
+// #define ADF7021_AFC_POS
 
 // Host communication selection:
 // #define STM32_USART1_HOST