diff --git a/MMDVM_STM32F4xx.coproj b/MMDVM_STM32F4xx.coproj
index 3038fa0..3348a05 100644
--- a/MMDVM_STM32F4xx.coproj
+++ b/MMDVM_STM32F4xx.coproj
@@ -4,7 +4,7 @@
     <Device manufacturerId="9" manufacturerName="ST" chipId="344" chipName="STM32F407VG" boardId="" boardName=""/>
     <BuildOption>
       <Compile>
-        <Option name="OptimizationLevel" value="1"/>
+        <Option name="OptimizationLevel" value="4"/>
         <Option name="UseFPU" value="0"/>
         <Option name="UserEditCompiler" value=""/>
         <Option name="SupportCPlusplus" value="1"/>
@@ -16,10 +16,11 @@
           <Define name="STM32F4XX"/>
           <Define name="USE_STDPERIPH_DRIVER"/>
           <Define name="__ASSEMBLY__"/>
-          <Define name="__FPU_USED"/>
           <Define name="SUPPORT_CPLUSPLUS"/>
           <Define name="STM32F40_41xxx"/>
           <Define name="HSE_VALUE=8000000"/>
+          <Define name="STM32F4_DISCOVERY"/>
+          <Define name="__FPU_USED"/>
         </DefinedSymbols>
       </Compile>
       <Link useDefault="0">
@@ -30,7 +31,7 @@
         <Option name="LTO" value="0"/>
         <Option name="IsNewStartupCode" value="1"/>
         <Option name="Library" value="Semihosting"/>
-        <Option name="UserEditLinker" value="-lstdc++"/>
+        <Option name="UserEditLinker" value="-lstdc++; --specs=nano.specs;"/>
         <LinkedLibraries>
           <Libset dir="stm32f4xx_lib\cmsis\lib\gcc\" libs="arm_cortexm4lf_math"/>
         </LinkedLibraries>
@@ -45,7 +46,7 @@
       <Output>
         <Option name="OutputFileType" value="0"/>
         <Option name="Path" value="./"/>
-        <Option name="Name" value="MMDVM_STM32F4xx"/>
+        <Option name="Name" value="MMDVM_DIS"/>
         <Option name="HEX" value="1"/>
         <Option name="BIN" value="1"/>
       </Output>
@@ -97,9 +98,9 @@
     <File name="SampleRB.cpp" path="SampleRB.cpp" type="1"/>
     <File name="CalDStarTX.h" path="CalDStarTX.h" type="1"/>
     <File name="STM32F4XX_Lib/CMSIS/Include/core_cm4.h" path="STM32F4XX_Lib/CMSIS/Include/core_cm4.h" type="1"/>
+    <File name="YSFRX.h" path="YSFRX.h" type="1"/>
     <File name="DMRSlotRX.h" path="DMRSlotRX.h" type="1"/>
     <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/source/stm32f4xx_tim.c" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/source/stm32f4xx_tim.c" type="1"/>
-    <File name="YSFRX.h" path="YSFRX.h" type="1"/>
     <File name="STM32F4XX_Lib/CMSIS/Include" path="" type="2"/>
     <File name="IO.cpp" path="IO.cpp" type="1"/>
     <File name="DMRDMORX.cpp" path="DMRDMORX.cpp" type="1"/>
@@ -115,29 +116,29 @@
     <File name="SampleRB.h" path="SampleRB.h" type="1"/>
     <File name="YSFTX.h" path="YSFTX.h" type="1"/>
     <File name="DMRRX.h" path="DMRRX.h" type="1"/>
-    <File name="MMDVM.cpp" path="MMDVM.cpp" type="1"/>
     <File name="IOTeensy.cpp" path="IOTeensy.cpp" type="1"/>
-    <File name="DMRDMORX.h" path="DMRDMORX.h" type="1"/>
+    <File name="MMDVM.cpp" path="MMDVM.cpp" type="1"/>
     <File name="STM32F4XX_Lib/CMSIS/Include/core_cmSimd.h" path="STM32F4XX_Lib/CMSIS/Include/core_cmSimd.h" type="1"/>
+    <File name="DMRDMORX.h" path="DMRDMORX.h" type="1"/>
     <File name="SerialPort.h" path="SerialPort.h" type="1"/>
     <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_dac.h" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_dac.h" type="1"/>
+    <File name="STM32F4XX_Lib/CMSIS/Include/core_cmFunc.h" path="STM32F4XX_Lib/CMSIS/Include/core_cmFunc.h" type="1"/>
     <File name="CWIdTX.h" path="CWIdTX.h" type="1"/>
     <File name="STM32F4XX_Lib/Device/system_stm32f4xx.h" path="STM32F4XX_Lib/Device/system_stm32f4xx.h" type="1"/>
-    <File name="STM32F4XX_Lib/CMSIS/Include/core_cmFunc.h" path="STM32F4XX_Lib/CMSIS/Include/core_cmFunc.h" type="1"/>
     <File name="CalDStarTX.cpp" path="CalDStarTX.cpp" type="1"/>
     <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/source" path="" type="2"/>
+    <File name="IODue.cpp" path="IODue.cpp" type="1"/>
     <File name="CalDMR.h" path="CalDMR.h" type="1"/>
     <File name="DMRDMOTX.h" path="DMRDMOTX.h" type="1"/>
-    <File name="IODue.cpp" path="IODue.cpp" type="1"/>
     <File name="DMRTX.cpp" path="DMRTX.cpp" type="1"/>
     <File name="P25RX.cpp" path="P25RX.cpp" type="1"/>
     <File name="STM32F4XX_Lib/CMSIS/Lib/GCC" path="" type="2"/>
     <File name="STM32F4XX_Lib" path="" type="2"/>
     <File name="STM32F4XX_Lib/CMSIS/Include/core_cmInstr.h" path="STM32F4XX_Lib/CMSIS/Include/core_cmInstr.h" type="1"/>
-    <File name="STM32F4XX_Lib/Device/system_stm32f4xx.c" path="STM32F4XX_Lib/Device/system_stm32f4xx.c" type="1"/>
     <File name="DMRTX.h" path="DMRTX.h" type="1"/>
-    <File name="STM32F4XX_Lib/Device/startup/startup_stm32f4xx.c" path="STM32F4XX_Lib/Device/startup/startup_stm32f4xx.c" type="1"/>
+    <File name="STM32F4XX_Lib/Device/system_stm32f4xx.c" path="STM32F4XX_Lib/Device/system_stm32f4xx.c" type="1"/>
     <File name="RSSIRB.h" path="RSSIRB.h" type="1"/>
+    <File name="STM32F4XX_Lib/Device/startup/startup_stm32f4xx.c" path="STM32F4XX_Lib/Device/startup/startup_stm32f4xx.c" type="1"/>
     <File name="STM32F4XX_Lib/Device/startup" path="" type="2"/>
     <File name="SerialRB.h" path="SerialRB.h" type="1"/>
     <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_gpio.h" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_gpio.h" type="1"/>
@@ -175,16 +176,16 @@
     <File name="DMRSlotType.h" path="DMRSlotType.h" type="1"/>
     <File name="Debug.h" path="Debug.h" type="1"/>
     <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/misc.h" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/misc.h" type="1"/>
-    <File name="RSSIRB.cpp" path="RSSIRB.cpp" type="1"/>
     <File name="P25TX.h" path="P25TX.h" type="1"/>
+    <File name="RSSIRB.cpp" path="RSSIRB.cpp" type="1"/>
     <File name="DStarRX.cpp" path="DStarRX.cpp" type="1"/>
     <File name="DMRSlotRX.cpp" path="DMRSlotRX.cpp" type="1"/>
     <File name="IOSTM.cpp" path="IOSTM.cpp" type="1"/>
     <File name="P25TX.cpp" path="P25TX.cpp" type="1"/>
     <File name="SerialRB.cpp" path="SerialRB.cpp" type="1"/>
     <File name="CWIdTX.cpp" path="CWIdTX.cpp" type="1"/>
-    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_usart.h" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_usart.h" type="1"/>
     <File name="DMRIdleRX.cpp" path="DMRIdleRX.cpp" type="1"/>
+    <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_usart.h" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/include/stm32f4xx_usart.h" type="1"/>
     <File name="STM32F4XX_Lib/.DS_Store" path="STM32F4XX_Lib/.DS_Store" type="1"/>
     <File name="YSFTX.cpp" path="YSFTX.cpp" type="1"/>
     <File name="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/source/stm32f4xx_gpio.c" path="STM32F4XX_Lib/STM32F4xx_StdPeriph_Driver/source/stm32f4xx_gpio.c" type="1"/>