From 80093c96ea332b2366f108117946762fd865669b Mon Sep 17 00:00:00 2001
From: sq8vps <sq8vps@gmail.com>
Date: Fri, 25 Aug 2023 11:56:06 +0200
Subject: [PATCH] working on modems

---
 .cproject    | 100 +++++++++++----------
 .gitmodules  |   3 +
 Inc/ax25.h   |   6 +-
 Inc/fx25.h   |  32 +++++++
 Src/ax25.c   | 246 ++++++++++++++++++++++++++++++++++++++++++++++++---
 Src/fx25.c   |  83 +++++++++++++++++
 Src/main.c   |  11 ++-
 bpf1200.c    |  42 +++++++++
 bpf1200inv.c |  42 +++++++++
 9 files changed, 497 insertions(+), 68 deletions(-)
 create mode 100644 .gitmodules
 create mode 100644 Inc/fx25.h
 create mode 100644 Src/fx25.c
 create mode 100644 bpf1200.c
 create mode 100644 bpf1200inv.c

diff --git a/.cproject b/.cproject
index 632be6e..b0d130b 100644
--- a/.cproject
+++ b/.cproject
@@ -17,16 +17,16 @@
 				<configuration artifactExtension="elf" artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe,org.eclipse.cdt.build.core.buildType=org.eclipse.cdt.build.core.buildType.debug" cleanCommand="rm -rf" description="" id="fr.ac6.managedbuild.config.gnu.cross.exe.debug.785246917" name="Debug" parent="fr.ac6.managedbuild.config.gnu.cross.exe.debug" postannouncebuildStep="Generating hex and Printing size information:" postbuildStep="arm-none-eabi-objcopy -O ihex &quot;${BuildArtifactFileBaseName}.elf&quot; &quot;${BuildArtifactFileBaseName}.hex&quot; &amp;&amp; arm-none-eabi-size &quot;${BuildArtifactFileName}&quot;">
 					<folderInfo id="fr.ac6.managedbuild.config.gnu.cross.exe.debug.785246917." name="/" resourcePath="">
 						<toolChain id="fr.ac6.managedbuild.toolchain.gnu.cross.exe.debug.2013979193" name="Ac6 STM32 MCU GCC" superClass="fr.ac6.managedbuild.toolchain.gnu.cross.exe.debug">
-							<option id="fr.ac6.managedbuild.option.gnu.cross.prefix.382830450" name="Prefix" superClass="fr.ac6.managedbuild.option.gnu.cross.prefix" value="arm-none-eabi-" valueType="string"/>
-							<option id="fr.ac6.managedbuild.option.gnu.cross.mcu.66405555" name="Mcu" superClass="fr.ac6.managedbuild.option.gnu.cross.mcu" value="STM32F103C8Tx" valueType="string"/>
-							<option id="fr.ac6.managedbuild.option.gnu.cross.board.1729153140" name="Board" superClass="fr.ac6.managedbuild.option.gnu.cross.board" value="F103C8T6_DIGI_USB" valueType="string"/>
-							<option id="fr.ac6.managedbuild.option.gnu.cross.core.1083960614" name="Core" superClass="fr.ac6.managedbuild.option.gnu.cross.core" valueType="stringList">
+							<option id="fr.ac6.managedbuild.option.gnu.cross.prefix.382830450" name="Prefix" superClass="fr.ac6.managedbuild.option.gnu.cross.prefix" useByScannerDiscovery="false" value="arm-none-eabi-" valueType="string"/>
+							<option id="fr.ac6.managedbuild.option.gnu.cross.mcu.66405555" name="Mcu" superClass="fr.ac6.managedbuild.option.gnu.cross.mcu" useByScannerDiscovery="false" value="STM32F103C8Tx" valueType="string"/>
+							<option id="fr.ac6.managedbuild.option.gnu.cross.board.1729153140" name="Board" superClass="fr.ac6.managedbuild.option.gnu.cross.board" useByScannerDiscovery="false" value="F103C8T6_DIGI_USB" valueType="string"/>
+							<option id="fr.ac6.managedbuild.option.gnu.cross.core.1083960614" name="Core" superClass="fr.ac6.managedbuild.option.gnu.cross.core" useByScannerDiscovery="false" valueType="stringList">
 								<listOptionValue builtIn="false" value="ARM Cortex-M3"/>
 								<listOptionValue builtIn="false" value="CM3"/>
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-							<option id="fr.ac6.managedbuild.option.gnu.cross.instructionSet.1656935294" name="Instruction Set" superClass="fr.ac6.managedbuild.option.gnu.cross.instructionSet" value="fr.ac6.managedbuild.option.gnu.cross.instructionSet.thumbII" valueType="enumerated"/>
-							<option id="fr.ac6.managedbuild.option.gnu.cross.fpu.1493691602" name="Floating point hardware" superClass="fr.ac6.managedbuild.option.gnu.cross.fpu" value="fr.ac6.managedbuild.option.gnu.cross.fpu.no" valueType="enumerated"/>
-							<option id="fr.ac6.managedbuild.option.gnu.cross.floatabi.2025609880" name="Floating-point ABI" superClass="fr.ac6.managedbuild.option.gnu.cross.floatabi" value="fr.ac6.managedbuild.option.gnu.cross.floatabi.soft" valueType="enumerated"/>
+							<option id="fr.ac6.managedbuild.option.gnu.cross.instructionSet.1656935294" name="Instruction Set" superClass="fr.ac6.managedbuild.option.gnu.cross.instructionSet" useByScannerDiscovery="false" value="fr.ac6.managedbuild.option.gnu.cross.instructionSet.thumbII" valueType="enumerated"/>
+							<option id="fr.ac6.managedbuild.option.gnu.cross.fpu.1493691602" name="Floating point hardware" superClass="fr.ac6.managedbuild.option.gnu.cross.fpu" useByScannerDiscovery="false" value="fr.ac6.managedbuild.option.gnu.cross.fpu.no" valueType="enumerated"/>
+							<option id="fr.ac6.managedbuild.option.gnu.cross.floatabi.2025609880" name="Floating-point ABI" superClass="fr.ac6.managedbuild.option.gnu.cross.floatabi" useByScannerDiscovery="false" value="fr.ac6.managedbuild.option.gnu.cross.floatabi.soft" valueType="enumerated"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="fr.ac6.managedbuild.targetPlatform.gnu.cross.2146232636" isAbstract="false" osList="all" superClass="fr.ac6.managedbuild.targetPlatform.gnu.cross"/>
 							<builder buildPath="${workspace_loc:/F103C8T6_DIGI_USB}/Debug" id="fr.ac6.managedbuild.builder.gnu.cross.458407908" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" parallelBuildOn="true" parallelizationNumber="optimal" superClass="fr.ac6.managedbuild.builder.gnu.cross">
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@@ -44,12 +44,15 @@
 									<listOptionValue builtIn="false" value="../Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc"/>
 									<listOptionValue builtIn="false" value="../Drivers/CMSIS/Device/ST/STM32F1xx/Include"/>
 									<listOptionValue builtIn="false" value="../Drivers/CMSIS/Include"/>
+									<listOptionValue builtIn="false" value="../lwfec"/>
 								</option>
 								<option id="gnu.c.compiler.option.preprocessor.def.symbols.600695662" name="Defined symbols (-D)" superClass="gnu.c.compiler.option.preprocessor.def.symbols" useByScannerDiscovery="false" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="USE_HAL_DRIVER"/>
+									<listOptionValue builtIn="false" value="ENABLE_FX25"/>
 									<listOptionValue builtIn="false" value="STM32F103xB"/>
 								</option>
-								<option id="fr.ac6.managedbuild.gnu.c.compiler.option.misc.other.1107445133" superClass="fr.ac6.managedbuild.gnu.c.compiler.option.misc.other" value="-fmessage-length=0" valueType="string"/>
+								<option id="fr.ac6.managedbuild.gnu.c.compiler.option.misc.other.1107445133" superClass="fr.ac6.managedbuild.gnu.c.compiler.option.misc.other" useByScannerDiscovery="false" value="-fmessage-length=0" valueType="string"/>
+								<option id="gnu.c.compiler.option.dialect.std.2115782942" superClass="gnu.c.compiler.option.dialect.std" useByScannerDiscovery="true" value="gnu.c.compiler.dialect.default" valueType="enumerated"/>
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@@ -69,16 +72,16 @@
 									<listOptionValue builtIn="false" value="USE_HAL_DRIVER"/>
 									<listOptionValue builtIn="false" value="STM32F103xB"/>
 								</option>
-								<option id="fr.ac6.managedbuild.gnu.cpp.compiler.option.misc.other.550542539" superClass="fr.ac6.managedbuild.gnu.cpp.compiler.option.misc.other" value="-fmessage-length=0" valueType="string"/>
+								<option id="fr.ac6.managedbuild.gnu.cpp.compiler.option.misc.other.550542539" name="Other flags" superClass="fr.ac6.managedbuild.gnu.cpp.compiler.option.misc.other" useByScannerDiscovery="false" value="-fmessage-length=0" valueType="string"/>
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 							<tool id="fr.ac6.managedbuild.tool.gnu.cross.c.linker.949266977" name="MCU GCC Linker" superClass="fr.ac6.managedbuild.tool.gnu.cross.c.linker">
-								<option id="fr.ac6.managedbuild.tool.gnu.cross.c.linker.script.100896041" name="Linker Script (-T)" superClass="fr.ac6.managedbuild.tool.gnu.cross.c.linker.script" value="../STM32F103C8Tx_FLASH.ld" valueType="string"/>
-								<option id="gnu.c.link.option.libs.1305202629" name="Libraries (-l)" superClass="gnu.c.link.option.libs" valueType="libs"/>
-								<option id="gnu.c.link.option.paths.1292687187" name="Library search path (-L)" superClass="gnu.c.link.option.paths" valueType="libPaths"/>
-								<option id="gnu.c.link.option.ldflags.2131178816" superClass="gnu.c.link.option.ldflags" value="-specs=nosys.specs -specs=nano.specs" valueType="string"/>
-								<option id="gnu.c.link.option.other.623842724" name="Other options (-Xlinker [option])" superClass="gnu.c.link.option.other" useByScannerDiscovery="false" valueType="stringList"/>
+								<option id="fr.ac6.managedbuild.tool.gnu.cross.c.linker.script.100896041" name="Linker Script (-T)" superClass="fr.ac6.managedbuild.tool.gnu.cross.c.linker.script" useByScannerDiscovery="false" value="../STM32F103C8Tx_FLASH.ld" valueType="string"/>
+								<option id="gnu.c.link.option.libs.1305202629" name="Libraries (-l)" superClass="gnu.c.link.option.libs" useByScannerDiscovery="false"/>
+								<option id="gnu.c.link.option.paths.1292687187" name="Library search path (-L)" superClass="gnu.c.link.option.paths" useByScannerDiscovery="false"/>
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+								<option id="gnu.c.link.option.other.623842724" name="Other options (-Xlinker [option])" superClass="gnu.c.link.option.other" useByScannerDiscovery="false"/>
 								<inputType id="cdt.managedbuild.tool.gnu.c.linker.input.751662654" superClass="cdt.managedbuild.tool.gnu.c.linker.input">
 									<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
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@@ -86,10 +89,10 @@
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-								<option id="gnu.cpp.link.option.libs.684453873" name="Libraries (-l)" superClass="gnu.cpp.link.option.libs" valueType="libs"/>
-								<option id="gnu.cpp.link.option.paths.749089985" name="Library search path (-L)" superClass="gnu.cpp.link.option.paths" valueType="libPaths"/>
-								<option id="gnu.cpp.link.option.flags.1490073641" superClass="gnu.cpp.link.option.flags" value="-specs=nosys.specs -specs=nano.specs" valueType="string"/>
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+								<option id="gnu.cpp.link.option.libs.684453873" name="Libraries (-l)" superClass="gnu.cpp.link.option.libs"/>
+								<option id="gnu.cpp.link.option.paths.749089985" name="Library search path (-L)" superClass="gnu.cpp.link.option.paths"/>
+								<option id="gnu.cpp.link.option.flags.1490073641" name="Linker flags" superClass="gnu.cpp.link.option.flags" value="-specs=nosys.specs -specs=nano.specs" valueType="string"/>
+								<option id="gnu.cpp.link.option.other.2071271866" name="Other options (-Xlinker [option])" superClass="gnu.cpp.link.option.other" useByScannerDiscovery="false"/>
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 									<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
 									<additionalInput kind="additionalinput" paths="$(LIBS)"/>
@@ -97,18 +100,18 @@
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 							<tool id="fr.ac6.managedbuild.tool.gnu.archiver.1989184041" name="MCU GCC Archiver" superClass="fr.ac6.managedbuild.tool.gnu.archiver"/>
 							<tool id="fr.ac6.managedbuild.tool.gnu.cross.assembler.1762903833" name="MCU GCC Assembler" superClass="fr.ac6.managedbuild.tool.gnu.cross.assembler">
-								<option id="gnu.both.asm.option.include.paths.1278058431" name="Include paths (-I)" superClass="gnu.both.asm.option.include.paths" valueType="includePath">
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 					<sourceEntries>
-						<entry excluding="" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="startup"/>
-						<entry excluding="" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Middlewares"/>
-						<entry excluding="" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Drivers"/>
-						<entry excluding="" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Src"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Drivers"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Middlewares"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Src"/>
+						<entry flags="VALUE_WORKSPACE_PATH" kind="sourcePath" name="lwfec"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="startup"/>
 					</sourceEntries>
 				</configuration>
 			</storageModule>
@@ -157,12 +160,14 @@
 									<listOptionValue builtIn="false" value="../Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc"/>
 									<listOptionValue builtIn="false" value="../Drivers/CMSIS/Device/ST/STM32F1xx/Include"/>
 									<listOptionValue builtIn="false" value="../Drivers/CMSIS/Include"/>
+									<listOptionValue builtIn="false" value="/vp-digi/lwfec"/>
+									<listOptionValue builtIn="false" value="../lwfec"/>
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 									<listOptionValue builtIn="false" value="USE_HAL_DRIVER"/>
 									<listOptionValue builtIn="false" value="STM32F103xB"/>
 								</option>
-								<option id="fr.ac6.managedbuild.gnu.c.compiler.option.misc.other.1107445133" superClass="fr.ac6.managedbuild.gnu.c.compiler.option.misc.other" value="-fmessage-length=0" valueType="string"/>
+								<option id="fr.ac6.managedbuild.gnu.c.compiler.option.misc.other.1107445133" superClass="fr.ac6.managedbuild.gnu.c.compiler.option.misc.other" useByScannerDiscovery="false" value="-fmessage-length=0" valueType="string"/>
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@@ -182,16 +187,16 @@
 									<listOptionValue builtIn="false" value="USE_HAL_DRIVER"/>
 									<listOptionValue builtIn="false" value="STM32F103xB"/>
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-								<option id="gnu.c.link.option.paths.1292687187" name="Library search path (-L)" superClass="gnu.c.link.option.paths" valueType="libPaths"/>
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+								<option id="gnu.c.link.option.libs.1305202629" name="Libraries (-l)" superClass="gnu.c.link.option.libs"/>
+								<option id="gnu.c.link.option.paths.1292687187" name="Library search path (-L)" superClass="gnu.c.link.option.paths"/>
+								<option id="gnu.c.link.option.ldflags.2131178816" name="Linker flags" superClass="gnu.c.link.option.ldflags" value="-specs=nosys.specs -specs=nano.specs" valueType="string"/>
+								<option id="gnu.c.link.option.other.623842724" name="Other options (-Xlinker [option])" superClass="gnu.c.link.option.other" useByScannerDiscovery="false"/>
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 									<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
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@@ -199,10 +204,10 @@
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-								<option id="gnu.cpp.link.option.libs.684453873" name="Libraries (-l)" superClass="gnu.cpp.link.option.libs" valueType="libs"/>
-								<option id="gnu.cpp.link.option.paths.749089985" name="Library search path (-L)" superClass="gnu.cpp.link.option.paths" valueType="libPaths"/>
+								<option id="gnu.cpp.link.option.libs.684453873" name="Libraries (-l)" superClass="gnu.cpp.link.option.libs"/>
+								<option id="gnu.cpp.link.option.paths.749089985" name="Library search path (-L)" superClass="gnu.cpp.link.option.paths"/>
 								<option id="gnu.cpp.link.option.ldflags.1398019047" superClass="gnu.cpp.link.option.ldflags" value="-specs=nosys.specs -specs=nano.specs" valueType="string"/>
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+								<option id="gnu.cpp.link.option.other.2071271866" name="Other options (-Xlinker [option])" superClass="gnu.cpp.link.option.other" useByScannerDiscovery="false"/>
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@@ -210,18 +215,17 @@
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+								<option id="gnu.both.asm.option.include.paths.1278058431" name="Include paths (-I)" superClass="gnu.both.asm.option.include.paths"/>
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 					<sourceEntries>
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-						<entry excluding="" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Middlewares"/>
-						<entry excluding="" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Drivers"/>
-						<entry excluding="" flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Src"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="startup"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Middlewares"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Drivers"/>
+						<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="sourcePath" name="Src"/>
 					</sourceEntries>
 				</configuration>
 			</storageModule>
@@ -231,17 +235,21 @@
 	<storageModule moduleId="cdtBuildSystem" version="4.0.0">
 		<project id="F103C8T6_DIGI_USB.fr.ac6.managedbuild.target.gnu.cross.exe.1488070975" name="Executable" projectType="fr.ac6.managedbuild.target.gnu.cross.exe"/>
 	</storageModule>
+	<storageModule moduleId="org.eclipse.cdt.core.LanguageSettingsProviders"/>
+	<storageModule moduleId="refreshScope" versionNumber="2">
+		<configuration configurationName="Debug">
+			<resource resourceType="PROJECT" workspacePath="/F103C8T6_DIGI_USB"/>
+		</configuration>
+		<configuration configurationName="Release"/>
+	</storageModule>
+	<storageModule moduleId="org.eclipse.cdt.make.core.buildtargets"/>
 	<storageModule moduleId="scannerConfiguration">
 		<autodiscovery enabled="true" problemReportingEnabled="true" selectedProfileId=""/>
 		<scannerConfigBuildInfo instanceId="fr.ac6.managedbuild.config.gnu.cross.exe.debug.785246917;fr.ac6.managedbuild.config.gnu.cross.exe.debug.785246917.;fr.ac6.managedbuild.tool.gnu.cross.c.compiler.736856211;fr.ac6.managedbuild.tool.gnu.cross.c.compiler.input.c.1385058365">
 			<autodiscovery enabled="false" problemReportingEnabled="true" selectedProfileId=""/>
 		</scannerConfigBuildInfo>
+		<scannerConfigBuildInfo instanceId="fr.ac6.managedbuild.config.gnu.cross.exe.release.2040258153;fr.ac6.managedbuild.config.gnu.cross.exe.release.2040258153.;fr.ac6.managedbuild.tool.gnu.cross.c.compiler.736856211;fr.ac6.managedbuild.tool.gnu.cross.c.compiler.input.c.1385058365">
+			<autodiscovery enabled="true" problemReportingEnabled="true" selectedProfileId=""/>
+		</scannerConfigBuildInfo>
 	</storageModule>
-	<storageModule moduleId="org.eclipse.cdt.core.LanguageSettingsProviders"/>
-	<storageModule moduleId="refreshScope" versionNumber="2">
-		<configuration artifactName="${ProjName}" configurationName="Debug">
-			<resource resourceType="PROJECT" workspacePath="F103C8T6_DIGI_USB"/>
-		</configuration>
-	</storageModule>
-	<storageModule moduleId="org.eclipse.cdt.make.core.buildtargets"/>
 </cproject>
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..dacf203
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lwfec"]
+	path = lwfec
+	url = https://github.com/sq8vps/lwfec
diff --git a/Inc/ax25.h b/Inc/ax25.h
index fb26893..45ea226 100644
--- a/Inc/ax25.h
+++ b/Inc/ax25.h
@@ -21,9 +21,6 @@ along with VP-Digi.  If not, see <http://www.gnu.org/licenses/>.
 #include <stdint.h>
 #include <stdbool.h>
 
-
-
-
 enum Ax25RxStage
 {
 	RX_STAGE_IDLE = 0,
@@ -36,7 +33,8 @@ struct Ax25ProtoConfig
 	uint16_t txDelayLength; //TXDelay length in ms
 	uint16_t txTailLength; //TXTail length in ms
 	uint16_t quietTime; //Quiet time in ms
-	uint8_t allowNonAprs; //allow non-APRS packets
+	uint8_t allowNonAprs : 1; //allow non-APRS packets
+	uint8_t fx25 : 1; //enable FX.25 (AX.25 + FEC)
 };
 
 extern struct Ax25ProtoConfig Ax25Config;
diff --git a/Inc/fx25.h b/Inc/fx25.h
new file mode 100644
index 0000000..21497ea
--- /dev/null
+++ b/Inc/fx25.h
@@ -0,0 +1,32 @@
+#ifndef FX25_H_
+#define FX25_H_
+
+#ifdef ENABLE_FX25
+
+#include <stdint.h>
+
+#define FX25_MAX_BLOCK_SIZE 255
+
+struct Fx25Mode
+{
+	uint64_t tag; //correlation tag
+	uint16_t K; //data size
+	uint8_t T; //parity check size
+};
+
+extern const struct Fx25Mode Fx25ModeList[11];
+
+/**
+ * @brief Get FX.25 mode for given payload size
+ * @param size Payload size including flags and CRC
+ * @return FX.25 mode structure pointer or NULL if standard AX.25 must be used
+ */
+const struct Fx25Mode* Fx25GetMode(uint16_t size);
+
+void Fx25AddParity(uint8_t *buffer, const struct Fx25Mode *mode);
+
+void Fx25Init(void);
+
+#endif
+
+#endif /* FX25_H_ */
diff --git a/Src/ax25.c b/Src/ax25.c
index 83fe662..1d467bd 100644
--- a/Src/ax25.c
+++ b/Src/ax25.c
@@ -22,12 +22,21 @@ along with VP-Digi.  If not, see <http://www.gnu.org/licenses/>.
 #include "drivers/systick.h"
 #include <stdbool.h>
 #include "digipeater.h"
+#include "fx25.h"
 
 struct Ax25ProtoConfig Ax25Config;
 
 //values below must be kept consistent so that FRAME_BUFFER_SIZE >= FRAME_MAX_SIZE * FRAME_MAX_COUNT
-#define FRAME_MAX_SIZE (308) //single frame max length for RX
-//308 bytes is the theoretical max size assuming 2-byte Control, 256-byte info field and 5 digi address fields
+#ifndef ENABLE_FX25
+//for AX.25 308 bytes is the theoretical max size assuming 2-byte Control, 256-byte info field and 5 digi address fields
+#define FRAME_MAX_SIZE (308) //single frame max length
+#else
+//in FX.25 mode the block can be 255 bytes long at most, and the AX.25 frame itself must be even smaller
+//frames that are too long are sent as standard AX.25 frames
+//Reed-Solomon library needs a bit of memory and the frame buffer must be smaller
+//otherwise we run out of RAM
+#define FRAME_MAX_SIZE (280) //single frame max length
+#endif
 #define FRAME_MAX_COUNT (10) //max count of frames in buffer
 #define FRAME_BUFFER_SIZE (FRAME_MAX_COUNT * FRAME_MAX_SIZE) //circular frame buffer length
 
@@ -41,6 +50,9 @@ struct FrameHandle
 	uint16_t start;
 	uint16_t size;
 	uint16_t signalLevel;
+#ifdef ENABLE_FX25
+	struct Fx25Mode *fx25Mode;
+#endif
 };
 
 static uint8_t rxBuffer[FRAME_BUFFER_SIZE]; //circular buffer for received frames
@@ -58,18 +70,28 @@ static uint8_t txFrameHead = 0;
 static uint8_t txFrameTail = 0;
 static bool txFrameBufferFull = false;
 
+#ifdef ENABLE_FX25
+static uint8_t txFx25Buffer[FX25_MAX_BLOCK_SIZE];
+static uint8_t txTagByteIdx = 0;
+#endif
+
 static uint8_t frameReceived; //a bitmap of receivers that received the frame
 
 
 enum TxStage
 {
-	TX_STAGE_IDLE,
+	TX_STAGE_IDLE = 0,
 	TX_STAGE_PREAMBLE,
 	TX_STAGE_HEADER_FLAGS,
 	TX_STAGE_DATA,
 	TX_STAGE_CRC,
 	TX_STAGE_FOOTER_FLAGS,
 	TX_STAGE_TAIL,
+
+#ifdef ENABLE_FX25
+	//stages used in FX.25 mode additionally
+	TX_STAGE_CORRELATION_TAG,
+#endif
 };
 
 enum TxInitStage
@@ -170,24 +192,172 @@ void Ax25TxKiss(uint8_t *buf, uint16_t len)
 	}
 }
 
+#ifdef ENABLE_FX25
+static void *writeFx25Frame(uint8_t *data, uint16_t size)
+{
+	//first calculate how big the frame can be
+	//this includes 2 flags, 2 CRC bytes and all bits added by bitstuffing
+	//bitstuffing occurs after 5 consecutive ones, so in worst scenario
+	//bits inserted by bitstuffing can occupy up to frame size / 5 additional bytes
+	//also add 1 in case there is a remainder when dividing
+	const struct Fx25Mode *fx25Mode = fx25Mode = Fx25GetMode(size + 4 + (size / 5) + 1);
+	uint16_t requiredSize = size;
+	if(NULL != fx25Mode)
+		requiredSize = fx25Mode->K + fx25Mode->T;
+	else
+		return NULL; //frame will not fit in FX.25
+
+	uint16_t freeSize = GET_FREE_SIZE(FRAME_BUFFER_SIZE, txBufferHead, txBufferTail);
+	if(freeSize < requiredSize) //check if there is enough size to store full FX.25 (or AX.25) frame
+	{
+		return NULL; //if not, it may fit in standard AX.25
+	}
+
+	txFrame[txFrameHead].size = requiredSize;
+	txFrame[txFrameHead].start = txBufferHead;
+	txFrame[txFrameHead].fx25Mode = (struct Fx25Mode*)fx25Mode;
+
+	uint16_t index = 0;
+	//header flag
+	txFx25Buffer[index++] = 0x7E;
+
+	uint16_t crc = 0xFFFF;
+
+	uint8_t bits = 0; //bit counter within a byte
+	uint8_t bitstuff = 0;
+	for(uint16_t i = 0; i < size + 2; i++)
+	{
+		for(uint8_t k = 0; k < 8; k++)
+		{
+			txFx25Buffer[index] >>= 1;
+			bits++;
+			if(i < size) //frame data
+			{
+				if(data[i] >> k)
+				{
+					calculateCRC(1, &crc);
+					bitstuff++;
+					txFx25Buffer[index] |= 0x80;
+				}
+				else
+				{
+					calculateCRC(0, &crc);
+					bitstuff = 0;
+				}
+			}
+			else //crc
+			{
+				uint8_t c = 0;
+				if(i == size)
+					c = (crc & 0xFF) ^ 0xFF;
+				else
+					c = (crc >> 8) ^ 0xFF;
+
+				if(c >> k)
+				{
+					bitstuff++;
+					txFx25Buffer[index] |= 0x80;
+				}
+				else
+				{
+					bitstuff = 0;
+				}
+			}
+
+			if(bits == 8)
+			{
+				bits = 0;
+				index++;
+			}
+			if(bitstuff == 5)
+			{
+				bits++;
+				bitstuff = 0;
+				txFx25Buffer[index] >>= 1;
+				if(bits == 8)
+				{
+					bits = 0;
+					index++;
+				}
+			}
+		}
+	}
+
+	//pad with flags
+	while(index < fx25Mode->K)
+	{
+		for(uint8_t k = 0; k < 8; k++)
+		{
+			txFx25Buffer[index] >>= 1;
+			bits++;
+
+			if(0x7E >> k)
+			{
+				txFx25Buffer[index] |= 0x80;
+			}
+
+			if(bits == 8)
+			{
+				bits = 0;
+				index++;
+			}
+		}
+	}
+
+	Fx25AddParity(txFx25Buffer, fx25Mode);
+
+	for(uint16_t i = 0; i < (fx25Mode->K + fx25Mode->T); i++)
+	{
+		txBuffer[txBufferHead++] = txFx25Buffer[i];
+		txBufferHead %= FRAME_BUFFER_SIZE;
+	}
+
+	void *ret = &txFrame[txFrameHead];
+	txFrameHead++;
+	txFrameHead %= FRAME_MAX_COUNT;
+	if(txFrameHead == txFrameTail)
+		txFrameBufferFull = true;
+	return ret;
+}
+#endif
+
 void *Ax25WriteTxFrame(uint8_t *data, uint16_t size)
 {
 	while(txStage != TX_STAGE_IDLE)
 		;
 
-	if((GET_FREE_SIZE(FRAME_BUFFER_SIZE, txBufferHead, txBufferTail) < size) || txFrameBufferFull)
+	if(txFrameBufferFull)
+		return NULL;
+
+#ifdef ENABLE_FX25
+	if(Ax25Config.fx25)
+	{
+		void *ret = writeFx25Frame(data, size);
+		if(ret)
+			return ret;
+	}
+#endif
+
+	if(GET_FREE_SIZE(FRAME_BUFFER_SIZE, txBufferHead, txBufferTail) < size)
 	{
 		return NULL;
 	}
 
-
 	txFrame[txFrameHead].size = size;
 	txFrame[txFrameHead].start = txBufferHead;
+
+#ifdef ENABLE_FX25
+	txFrame[txFrameHead].fx25Mode = NULL;
+#endif
+
+
 	for(uint16_t i = 0; i < size; i++)
 	{
 		txBuffer[txBufferHead++] = data[i];
 		txBufferHead %= FRAME_BUFFER_SIZE;
 	}
+
+
 	void *ret = &txFrame[txFrameHead];
 	txFrameHead++;
 	txFrameHead %= FRAME_MAX_COUNT;
@@ -366,18 +536,33 @@ uint8_t Ax25GetTxBit(void)
 		txBitIdx = 0;
 		if(txStage == TX_STAGE_PREAMBLE) //transmitting preamble (TXDelay)
 		{
-			if(txDelayElapsed < txDelay) //still transmitting
+			if(txDelayElapsed < txDelay)
 			{
 				txByte = 0x7E;
 				txDelayElapsed++;
 			}
-			else //now transmit initial flags
+			else
 			{
 				txDelayElapsed = 0;
-				txStage = TX_STAGE_HEADER_FLAGS;
+				if(NULL != txFrame[txFrameTail].fx25Mode)
+				{
+					txStage = TX_STAGE_CORRELATION_TAG;
+					txTagByteIdx = 0;
+				}
+				else
+					txStage = TX_STAGE_HEADER_FLAGS;
 			}
-
 		}
+#ifdef ENABLE_FX25
+transmitTag:
+		if(txStage == TX_STAGE_CORRELATION_TAG) //FX.25 correlation tag
+		{
+			if(txTagByteIdx < 8)
+				txByte = (txFrame[txFrameTail].fx25Mode->tag >> (8 * txTagByteIdx)) & 0xFF;
+			else
+				txStage = TX_STAGE_DATA;
+		}
+#endif
 		if(txStage == TX_STAGE_HEADER_FLAGS) //transmitting initial flags
 		{
 			if(txFlagsElapsed < STATIC_HEADER_FLAG_COUNT)
@@ -401,7 +586,29 @@ transmitNormalData:
 					txByte = txBuffer[(txFrame[txFrameTail].start + txByteIdx) % FRAME_BUFFER_SIZE];
 					txByteIdx++;
 				}
-				else //end of buffer, send CRC
+#ifdef ENABLE_FX25
+				else if(txFrame[txFrameTail].fx25Mode != NULL)
+				{
+					txFrameBufferFull = false;
+					txFrameTail++;
+					txFrameTail %= FRAME_MAX_COUNT;
+					txByteIdx = 0;
+					if((txFrameHead != txFrameTail) || txFrameBufferFull)
+					{
+						if(txFrame[txFrameTail].fx25Mode != NULL)
+						{
+							txStage = TX_STAGE_CORRELATION_TAG;
+							txTagByteIdx = 0;
+							goto transmitTag;
+						}
+						else
+							goto transmitNormalData;
+					}
+					else
+						goto transmitTail;
+				}
+#endif
+				else
 				{
 					txStage = TX_STAGE_CRC; //transmit CRC
 					txCrcByteIdx = 0;
@@ -409,6 +616,7 @@ transmitNormalData:
 			}
 			else //no more frames
 			{
+transmitTail:
 				txByteIdx = 0;
 				txBitIdx = 0;
 				txStage = TX_STAGE_TAIL;
@@ -440,10 +648,19 @@ transmitNormalData:
 			else
 			{
 				txFlagsElapsed = 0;
-				txStage = TX_STAGE_DATA; //return to normal data transmission stage. There might be a next frame to transmit
 				txFrameBufferFull = false;
 				txFrameTail++;
 				txFrameTail %= FRAME_MAX_COUNT;
+				txByteIdx = 0;
+#ifdef ENABLE_FX25
+				if(((txFrameHead != txFrameTail) || txFrameBufferFull) && (txFrame[txFrameTail].fx25Mode != NULL))
+				{
+					txStage = TX_STAGE_CORRELATION_TAG;
+					txTagByteIdx = 0;
+					goto transmitTag;
+				}
+#endif
+				txStage = TX_STAGE_DATA; //return to normal data transmission stage. There might be a next frame to transmit
 				goto transmitNormalData;
 			}
 		}
@@ -471,8 +688,8 @@ transmitNormalData:
 	}
 
 	uint8_t txBit = 0;
-
-	if((txStage == TX_STAGE_DATA) || (txStage == TX_STAGE_CRC)) //transmitting normal data or CRC
+	//transmitting normal data or CRC in AX.25 mode
+	if((NULL != txFrame[txFrameTail].fx25Mode) || (txStage == TX_STAGE_DATA) || (txStage == TX_STAGE_CRC))
 	{
 		if(txBitstuff == 5) //5 consecutive ones transmitted
 		{
@@ -498,7 +715,8 @@ transmitNormalData:
 			txBitIdx++;
 		}
 	}
-	else //transmitting preamble or flags, don't calculate CRC, don't use bit stuffing
+	//transmitting in FX.25 mode or in AX.25 mode, but these are preamble or flags, don't calculate CRC, don't use bit stuffing
+	else
 	{
 		txBit = txByte & 1;
 		txByte >>= 1;
diff --git a/Src/fx25.c b/Src/fx25.c
new file mode 100644
index 0000000..e693ced
--- /dev/null
+++ b/Src/fx25.c
@@ -0,0 +1,83 @@
+
+#ifdef ENABLE_FX25
+
+#include "fx25.h"
+#include <stddef.h>
+#include "rs.h"
+
+#define FX25_PREGENERATE_POLYS
+
+const struct Fx25Mode Fx25ModeList[11] =
+{
+	{.tag =  0xB74DB7DF8A532F3E, .K = 239, .T = 16},
+	{.tag =  0x26FF60A600CC8FDE, .K = 128, .T = 16},
+	{.tag =  0xC7DC0508F3D9B09E, .K = 64, .T = 16},
+	{.tag =  0x8F056EB4369660EE, .K = 32, .T = 16},
+	{.tag =  0x6E260B1AC5835FAE, .K = 223, .T = 32},
+	{.tag =  0xFF94DC634F1CFF4E, .K = 128, .T = 32},
+	{.tag =  0x1EB7B9CDBC09C00E, .K = 64, .T = 32},
+	{.tag =  0xDBF869BD2DBB1776, .K = 32, .T = 32},
+	{.tag =  0x3ADB0C13DEAE2836, .K = 191, .T = 64},
+	{.tag =  0xAB69DB6A543188D6, .K = 128, .T = 64},
+	{.tag =  0x4A4ABEC4A724B796, .K = 64, .T = 64}
+};
+
+const struct Fx25Mode* Fx25GetMode(uint16_t size)
+{
+	if(size <= 32)
+		return &Fx25ModeList[3];
+	else if(size <= 64)
+		return &Fx25ModeList[2];
+	else if(size <= 128)
+		return &Fx25ModeList[5];
+	else if(size <= 191)
+		return &Fx25ModeList[8];
+	else if(size <= 223)
+		return &Fx25ModeList[4];
+	else if(size <= 239)
+		return &Fx25ModeList[0];
+	else
+		return NULL; //frame too big, do not use FX.25
+}
+
+#ifdef FX25_PREGENERATE_POLYS
+static uint8_t poly16[17], poly32[33], poly64[65];
+#else
+static uint8_t poly[65];
+#endif
+
+void Fx25AddParity(uint8_t *buffer, const struct Fx25Mode *mode)
+{
+#ifdef FX25_PREGENERATE_POLYS
+	uint8_t *poly = NULL;
+	switch(mode->T)
+	{
+		case 16:
+			poly = poly16;
+			break;
+		case 32:
+			poly = poly32;
+			break;
+		case 64:
+			poly = poly64;
+			break;
+		default:
+			poly = poly16;
+	}
+#else
+	RsGeneratePolynomial(mode->T, poly);
+#endif
+	RsEncode(buffer, mode->K + mode->T, poly, mode->T);
+}
+
+void Fx25Init(void)
+{
+#ifdef FX25_PREGENERATE_POLYS
+	RsGeneratePolynomial(16, poly16);
+	RsGeneratePolynomial(32, poly32);
+	RsGeneratePolynomial(64, poly64);
+#else
+#endif
+}
+
+#endif
diff --git a/Src/main.c b/Src/main.c
index d0ce825..2f37590 100644
--- a/Src/main.c
+++ b/Src/main.c
@@ -52,7 +52,9 @@ along with VP-Digi.  If not, see <http://www.gnu.org/licenses/>.
 #include "beacon.h"
 #include "terminal.h"
 #include "config.h"
-
+#ifdef ENABLE_FX25
+#include "fx25.h"
+#endif
 /* USER CODE END Includes */
 
 /* Private typedef -----------------------------------------------------------*/
@@ -232,6 +234,9 @@ int main(void)
 	ConfigRead();
 
 	Ax25Init();
+#ifdef ENABLE_FX25
+	Fx25Init();
+#endif
 
 	UartInit(&Uart1, USART1, Uart1.baudrate);
 	UartInit(&Uart2, USART2, Uart2.baudrate);
@@ -265,7 +270,6 @@ int main(void)
 
 	  Ax25TransmitCheck(); //check for pending transmission request
 
-
 	  if(UartUsb.rxType != DATA_NOTHING)
 	  {
 		  TermHandleSpecial(&UartUsb);
@@ -290,8 +294,7 @@ int main(void)
 
 	  BeaconCheck(); //check beacons
 
-
-	  if(SysTickGet() > 0xFFFFF000)
+	  if(SysTickGet() > 0xFFFFF000) //going to wrap around soon - hard reset the device
 		  NVIC_SystemReset();
   }
   /* USER CODE END 3 */
diff --git a/bpf1200.c b/bpf1200.c
new file mode 100644
index 0000000..86123a6
--- /dev/null
+++ b/bpf1200.c
@@ -0,0 +1,42 @@
+/**************************************************************
+WinFilter version 0.8
+http://www.winfilter.20m.com
+akundert@hotmail.com
+
+Filter type: Band Pass
+Filter model: Rectangular Window
+Sampling Frequency: 9 KHz
+Fc1 and Fc2 Frequencies: 1.350000 KHz and 3.650000 KHz
+Coefficents Quantization: 16-bit
+***************************************************************/
+#define Ntap 8
+
+#define DCgain 65536
+
+__int16 fir(__int16 NewSample) {
+    __int16 FIRCoef[Ntap] = { 
+         2072,
+        -21528,
+        -1815,
+        32566,
+        -1815,
+        -21528,
+         2072,
+         1547
+    };
+
+    static __int16 x[Ntap]; //input samples
+    __int32 y=0;            //output sample
+    int n;
+
+    //shift the old samples
+    for(n=Ntap-1; n>0; n--)
+       x[n] = x[n-1];
+
+    //Calculate the new output
+    x[0] = NewSample;
+    for(n=0; n<Ntap; n++)
+        y += FIRCoef[n] * x[n];
+    
+    return y / DCgain;
+}
diff --git a/bpf1200inv.c b/bpf1200inv.c
new file mode 100644
index 0000000..b54a79e
--- /dev/null
+++ b/bpf1200inv.c
@@ -0,0 +1,42 @@
+/**************************************************************
+WinFilter version 0.8
+http://www.winfilter.20m.com
+akundert@hotmail.com
+
+Filter type: Band Pass
+Filter model: Rectangular Window
+Sampling Frequency: 9 KHz
+Fc1 and Fc2 Frequencies: 0.300000 KHz and 2.800000 KHz
+Coefficents Quantization: 16-bit
+***************************************************************/
+#define Ntap 8
+
+#define DCgain 32768
+
+__int16 fir(__int16 NewSample) {
+    __int16 FIRCoef[Ntap] = { 
+        -5826,
+        -6019,
+        10614,
+        22443,
+        10614,
+        -6019,
+        -5826,
+          517
+    };
+
+    static __int16 x[Ntap]; //input samples
+    __int32 y=0;            //output sample
+    int n;
+
+    //shift the old samples
+    for(n=Ntap-1; n>0; n--)
+       x[n] = x[n-1];
+
+    //Calculate the new output
+    x[0] = NewSample;
+    for(n=0; n<Ntap; n++)
+        y += FIRCoef[n] * x[n];
+    
+    return y / DCgain;
+}