diff --git a/src/main/blackbox/blackbox_io.c b/src/main/blackbox/blackbox_io.c
index 7741f5be0d..ba078afe63 100644
--- a/src/main/blackbox/blackbox_io.c
+++ b/src/main/blackbox/blackbox_io.c
@@ -55,7 +55,7 @@ static struct {
 
 #endif // USE_SDCARD
 
-void blackboxOpen()
+void blackboxOpen(void)
 {
     serialPort_t *sharedBlackboxAndMspPort = findSharedSerialPort(FUNCTION_BLACKBOX, FUNCTION_MSP);
     if (sharedBlackboxAndMspPort) {
@@ -351,7 +351,7 @@ static void blackboxLogFileCreated(afatfsFilePtr_t file)
     }
 }
 
-static void blackboxCreateLogFile()
+static void blackboxCreateLogFile(void)
 {
     uint32_t remainder = blackboxSDCard.largestLogFileNumber + 1;
 
@@ -372,7 +372,7 @@ static void blackboxCreateLogFile()
  *
  * Keep calling until the function returns true (open is complete).
  */
-static bool blackboxSDCardBeginLog()
+static bool blackboxSDCardBeginLog(void)
 {
     fatDirectoryEntry_t *directoryEntry;
 
@@ -511,7 +511,7 @@ bool isBlackboxDeviceFull(void)
     }
 }
 
-unsigned int blackboxGetLogNumber()
+unsigned int blackboxGetLogNumber(void)
 {
 #ifdef USE_SDCARD
     return blackboxSDCard.largestLogFileNumber;
@@ -523,7 +523,7 @@ unsigned int blackboxGetLogNumber()
  * Call once every loop iteration in order to maintain the global blackboxHeaderBudget with the number of bytes we can
  * transmit this iteration.
  */
-void blackboxReplenishHeaderBudget()
+void blackboxReplenishHeaderBudget(void)
 {
     int32_t freeSpace;
 
diff --git a/src/main/blackbox/blackbox_io.h b/src/main/blackbox/blackbox_io.h
index 06d5ef0e0c..4cfc0ca810 100644
--- a/src/main/blackbox/blackbox_io.h
+++ b/src/main/blackbox/blackbox_io.h
@@ -53,7 +53,7 @@ bool blackboxDeviceBeginLog(void);
 bool blackboxDeviceEndLog(bool retainLog);
 
 bool isBlackboxDeviceFull(void);
-unsigned int blackboxGetLogNumber();
+unsigned int blackboxGetLogNumber(void);
 
-void blackboxReplenishHeaderBudget();
+void blackboxReplenishHeaderBudget(void);
 blackboxBufferReserveStatus_e blackboxDeviceReserveBufferSpace(int32_t bytes);
diff --git a/src/main/cms/cms_menu_blackbox.c b/src/main/cms/cms_menu_blackbox.c
index 36f3dbdd23..1bcf7eb88d 100644
--- a/src/main/cms/cms_menu_blackbox.c
+++ b/src/main/cms/cms_menu_blackbox.c
@@ -69,7 +69,7 @@ static char cmsx_BlackboxStatus[CMS_BLACKBOX_STRING_LENGTH];
 static char cmsx_BlackboxDeviceStorageUsed[CMS_BLACKBOX_STRING_LENGTH];
 static char cmsx_BlackboxDeviceStorageFree[CMS_BLACKBOX_STRING_LENGTH];
 
-static void cmsx_Blackbox_GetDeviceStatus()
+static void cmsx_Blackbox_GetDeviceStatus(void)
 {
     char * unit = "B";
 #if defined(USE_SDCARD) || defined(USE_FLASHFS)
diff --git a/src/main/cms/cms_menu_vtx_tramp.c b/src/main/cms/cms_menu_vtx_tramp.c
index b177274449..ff0f9afaf2 100644
--- a/src/main/cms/cms_menu_vtx_tramp.c
+++ b/src/main/cms/cms_menu_vtx_tramp.c
@@ -156,7 +156,7 @@ static long trampCmsCommence(displayPort_t *pDisp, const void *self)
     return MENU_CHAIN_BACK;
 }
 
-static void trampCmsInitSettings()
+static void trampCmsInitSettings(void)
 {
     if (trampBand > 0) trampCmsBand = trampBand;
     if (trampChannel > 0) trampCmsChan = trampChannel;
@@ -174,7 +174,7 @@ static void trampCmsInitSettings()
     }
 }
 
-static long trampCmsOnEnter()
+static long trampCmsOnEnter(void)
 {
     trampCmsInitSettings();
     return 0;
diff --git a/src/main/config/feature.c b/src/main/config/feature.c
index bb5e5b9a75..8ee9c4afef 100644
--- a/src/main/config/feature.c
+++ b/src/main/config/feature.c
@@ -43,7 +43,7 @@ void intFeatureClearAll(uint32_t *features)
     *features = 0;
 }
 
-void latchActiveFeatures()
+void latchActiveFeatures(void)
 {
     activeFeaturesLatch = featureConfig()->enabledFeatures;
 }
@@ -68,7 +68,7 @@ void featureClear(uint32_t mask)
     intFeatureClear(mask, &featureConfigMutable()->enabledFeatures);
 }
 
-void featureClearAll()
+void featureClearAll(void)
 {
     intFeatureClearAll(&featureConfigMutable()->enabledFeatures);
 }
diff --git a/src/main/config/parameter_group.c b/src/main/config/parameter_group.c
index 30bf48430a..a64d0eb973 100644
--- a/src/main/config/parameter_group.c
+++ b/src/main/config/parameter_group.c
@@ -85,7 +85,7 @@ int pgStore(const pgRegistry_t* reg, void *to, int size)
     return take;
 }
 
-void pgResetAll()
+void pgResetAll(void)
 {
     PG_FOREACH(reg) {
         pgReset(reg);
diff --git a/src/main/config/parameter_group.h b/src/main/config/parameter_group.h
index f64493ee87..9bee7b925f 100644
--- a/src/main/config/parameter_group.h
+++ b/src/main/config/parameter_group.h
@@ -186,7 +186,7 @@ const pgRegistry_t* pgFind(pgn_t pgn);
 
 void pgLoad(const pgRegistry_t* reg, const void *from, int size, int version);
 int pgStore(const pgRegistry_t* reg, void *to, int size);
-void pgResetAll();
+void pgResetAll(void);
 void pgResetInstance(const pgRegistry_t *reg, uint8_t *base);
 bool pgResetCopy(void *copy, pgn_t pgn);
 void pgReset(const pgRegistry_t* reg);
diff --git a/src/main/drivers/camera_control.c b/src/main/drivers/camera_control.c
index 82ef9ef0f7..50d68e818a 100644
--- a/src/main/drivers/camera_control.c
+++ b/src/main/drivers/camera_control.c
@@ -77,14 +77,14 @@ static struct {
 static uint32_t endTimeMillis;
 
 #ifdef CAMERA_CONTROL_SOFTWARE_PWM_AVAILABLE
-void TIM6_DAC_IRQHandler()
+void TIM6_DAC_IRQHandler(void)
 {
     IOHi(cameraControlRuntime.io);
 
     TIM6->SR = 0;
 }
 
-void TIM7_IRQHandler()
+void TIM7_IRQHandler(void)
 {
     IOLo(cameraControlRuntime.io);
 
@@ -92,7 +92,7 @@ void TIM7_IRQHandler()
 }
 #endif
 
-void cameraControlInit()
+void cameraControlInit(void)
 {
     if (cameraControlConfig()->ioTag == IO_TAG_NONE)
         return;
diff --git a/src/main/drivers/camera_control.h b/src/main/drivers/camera_control.h
index cafc58b955..031fb27aeb 100644
--- a/src/main/drivers/camera_control.h
+++ b/src/main/drivers/camera_control.h
@@ -49,7 +49,7 @@ typedef struct cameraControlConfig_s {
 
 PG_DECLARE(cameraControlConfig_t, cameraControlConfig);
 
-void cameraControlInit();
+void cameraControlInit(void);
 
 void cameraControlProcess(uint32_t currentTimeUs);
 void cameraControlKeyPress(cameraControlKey_e key, uint32_t holdDurationMs);
diff --git a/src/main/drivers/cc2500.c b/src/main/drivers/cc2500.c
index 07aecd425d..b704244846 100644
--- a/src/main/drivers/cc2500.c
+++ b/src/main/drivers/cc2500.c
@@ -73,7 +73,7 @@ void cc2500SetPower(uint8_t power)
     cc2500WriteReg(CC2500_3E_PATABLE, patable[power]);
 }
 
-uint8_t cc2500Reset()
+uint8_t cc2500Reset(void)
 {
     cc2500Strobe(CC2500_SRES);
     delayMicroseconds(1000); // 1000us
diff --git a/src/main/drivers/cc2500.h b/src/main/drivers/cc2500.h
index 899ddb7247..a6cc96e1dc 100644
--- a/src/main/drivers/cc2500.h
+++ b/src/main/drivers/cc2500.h
@@ -150,4 +150,4 @@ uint8_t cc2500ReadReg(uint8_t reg);
 void cc2500Strobe(uint8_t address);
 uint8_t cc2500WriteReg(uint8_t address, uint8_t data);
 void cc2500SetPower(uint8_t power);
-uint8_t cc2500Reset();
+uint8_t cc2500Reset(void);
diff --git a/src/main/drivers/compass/compass_ak8963.c b/src/main/drivers/compass/compass_ak8963.c
index 99cedf6a16..40ca786940 100644
--- a/src/main/drivers/compass/compass_ak8963.c
+++ b/src/main/drivers/compass/compass_ak8963.c
@@ -152,7 +152,7 @@ static bool ak8963SensorWrite(uint8_t addr_, uint8_t reg_, uint8_t data)
 }
 #endif
 
-static bool ak8963Init()
+static bool ak8963Init(void)
 {
     uint8_t calibration[3];
     uint8_t status;
diff --git a/src/main/drivers/compass/compass_ak8975.c b/src/main/drivers/compass/compass_ak8975.c
index f36596580e..52528f54e0 100644
--- a/src/main/drivers/compass/compass_ak8975.c
+++ b/src/main/drivers/compass/compass_ak8975.c
@@ -59,7 +59,7 @@
 #define AK8975A_ASAY 0x11 // Fuse ROM y-axis sensitivity adjustment value
 #define AK8975A_ASAZ 0x12 // Fuse ROM z-axis sensitivity adjustment value
 
-static bool ak8975Init()
+static bool ak8975Init(void)
 {
     uint8_t buffer[3];
     uint8_t status;
diff --git a/src/main/drivers/sdcard.c b/src/main/drivers/sdcard.c
index 3af9ee13a4..e2e8dd5f1c 100644
--- a/src/main/drivers/sdcard.c
+++ b/src/main/drivers/sdcard.c
@@ -632,7 +632,7 @@ static bool sdcard_setBlockLength(uint32_t blockLen)
 /*
  * Returns true if the card is ready to accept read/write commands.
  */
-static bool sdcard_isReady()
+static bool sdcard_isReady(void)
 {
     return sdcard.state == SDCARD_STATE_READY || sdcard.state == SDCARD_STATE_WRITING_MULTIPLE_BLOCKS;
 }
@@ -647,7 +647,7 @@ static bool sdcard_isReady()
  *                                    the SDCARD_READY state.
  *
  */
-static sdcardOperationStatus_e sdcard_endWriteBlocks()
+static sdcardOperationStatus_e sdcard_endWriteBlocks(void)
 {
     sdcard.multiWriteBlocksRemain = 0;
 
diff --git a/src/main/drivers/sdcard.h b/src/main/drivers/sdcard.h
index cf101dd156..1dca004440 100644
--- a/src/main/drivers/sdcard.h
+++ b/src/main/drivers/sdcard.h
@@ -66,11 +66,11 @@ sdcardOperationStatus_e sdcard_writeBlock(uint32_t blockIndex, uint8_t *buffer,
 void sdcardInsertionDetectDeinit(void);
 void sdcardInsertionDetectInit(void);
 
-bool sdcard_isInserted();
-bool sdcard_isInitialized();
-bool sdcard_isFunctional();
+bool sdcard_isInserted(void);
+bool sdcard_isInitialized(void);
+bool sdcard_isFunctional(void);
 
-bool sdcard_poll();
-const sdcardMetadata_t* sdcard_getMetadata();
+bool sdcard_poll(void);
+const sdcardMetadata_t* sdcard_getMetadata(void);
 
 void sdcard_setProfilerCallback(sdcard_profilerCallback_c callback);
diff --git a/src/main/drivers/serial_usb_vcp.c b/src/main/drivers/serial_usb_vcp.c
index dd70c8d028..fe9445dbdf 100644
--- a/src/main/drivers/serial_usb_vcp.c
+++ b/src/main/drivers/serial_usb_vcp.c
@@ -154,8 +154,9 @@ static void usbVcpBeginWrite(serialPort_t *instance)
     port->buffering = true;
 }
 
-uint32_t usbTxBytesFree()
+static uint32_t usbTxBytesFree(const serialPort_t *instance)
 {
+    UNUSED(instance);
     return CDC_Send_FreeBytes();
 }
 
diff --git a/src/main/fc/cli.c b/src/main/fc/cli.c
index ccb95f36a1..853f6abcf1 100755
--- a/src/main/fc/cli.c
+++ b/src/main/fc/cli.c
@@ -207,7 +207,7 @@ static void cliPrint(const char *str)
     bufWriterFlush(cliWriter);
 }
 
-static void cliPrintLinefeed()
+static void cliPrintLinefeed(void)
 {
     cliPrint("\r\n");
 }
diff --git a/src/main/fc/config.h b/src/main/fc/config.h
index 40d7fe1a13..d4460900fb 100644
--- a/src/main/fc/config.h
+++ b/src/main/fc/config.h
@@ -110,7 +110,7 @@ void setPreferredBeeperOffMask(uint32_t mask);
 void initEEPROM(void);
 void resetEEPROM(void);
 void readEEPROM(void);
-void writeEEPROM();
+void writeEEPROM(void);
 void ensureEEPROMContainsValidData(void);
 
 void saveConfigAndNotify(void);
diff --git a/src/main/fc/fc_core.c b/src/main/fc/fc_core.c
index eb179c9893..8326a434d8 100644
--- a/src/main/fc/fc_core.c
+++ b/src/main/fc/fc_core.c
@@ -131,7 +131,7 @@ void applyAndSaveAccelerometerTrimsDelta(rollAndPitchTrims_t *rollAndPitchTrimsD
     saveConfigAndNotify();
 }
 
-static bool isCalibrating()
+static bool isCalibrating(void)
 {
 #ifdef BARO
     if (sensors(SENSOR_BARO) && !isBaroCalibrationComplete()) {
diff --git a/src/main/fc/fc_core.h b/src/main/fc/fc_core.h
index d9ac269c69..e42957633c 100644
--- a/src/main/fc/fc_core.h
+++ b/src/main/fc/fc_core.h
@@ -36,7 +36,7 @@ PG_DECLARE(throttleCorrectionConfig_t, throttleCorrectionConfig);
 
 union rollAndPitchTrims_u;
 void applyAndSaveAccelerometerTrimsDelta(union rollAndPitchTrims_u *rollAndPitchTrimsDelta);
-void handleInflightCalibrationStickPosition();
+void handleInflightCalibrationStickPosition(void);
 
 void resetArmingDisabled(void);
 
diff --git a/src/main/flight/failsafe.h b/src/main/flight/failsafe.h
index 581fe287ac..0d179fbcba 100644
--- a/src/main/flight/failsafe.h
+++ b/src/main/flight/failsafe.h
@@ -80,7 +80,7 @@ void failsafeReset(void);
 void failsafeStartMonitoring(void);
 void failsafeUpdateState(void);
 
-failsafePhase_e failsafePhase();
+failsafePhase_e failsafePhase(void);
 bool failsafeIsMonitoring(void);
 bool failsafeIsActive(void);
 bool failsafeIsReceivingRxData(void);
diff --git a/src/main/io/asyncfatfs/asyncfatfs.c b/src/main/io/asyncfatfs/asyncfatfs.c
index d8d5c3cf2c..4400f4dc48 100644
--- a/src/main/io/asyncfatfs/asyncfatfs.c
+++ b/src/main/io/asyncfatfs/asyncfatfs.c
@@ -539,7 +539,7 @@ static bool afatfs_fileIsBusy(afatfsFilePtr_t file)
  *
  * Note that this is the same as the number of clusters in an AFATFS supercluster.
  */
-static uint32_t afatfs_fatEntriesPerSector()
+static uint32_t afatfs_fatEntriesPerSector(void)
 {
     return afatfs.filesystemType == FAT_FILESYSTEM_TYPE_FAT32 ? AFATFS_FAT32_FAT_ENTRIES_PER_SECTOR : AFATFS_FAT16_FAT_ENTRIES_PER_SECTOR;
 }
@@ -548,7 +548,7 @@ static uint32_t afatfs_fatEntriesPerSector()
  * Size of a FAT cluster in bytes
  */
 ONLY_EXPOSE_FOR_TESTING
-uint32_t afatfs_clusterSize()
+uint32_t afatfs_clusterSize(void)
 {
     return afatfs.sectorsPerCluster * AFATFS_SECTOR_SIZE;
 }
@@ -806,7 +806,7 @@ static int afatfs_allocateCacheSector(uint32_t sectorIndex)
 /**
  * Attempt to flush dirty cache pages out to the sdcard, returning true if all flushable data has been flushed.
  */
-bool afatfs_flush()
+bool afatfs_flush(void)
 {
     if (afatfs.cacheDirtyEntries > 0) {
         // Flush the oldest flushable sector
@@ -836,7 +836,7 @@ bool afatfs_flush()
 /**
  * Returns true if either the freefile or the regular cluster pool has been exhausted during a previous write operation.
  */
-bool afatfs_isFull()
+bool afatfs_isFull(void)
 {
     return afatfs.filesystemFull;
 }
@@ -1618,7 +1618,7 @@ static afatfsOperationStatus_e afatfs_appendRegularFreeCluster(afatfsFilePtr_t f
  * Size of a AFATFS supercluster in bytes
  */
 ONLY_EXPOSE_FOR_TESTING
-uint32_t afatfs_superClusterSize()
+uint32_t afatfs_superClusterSize(void)
 {
     return afatfs_fatEntriesPerSector() * afatfs_clusterSize();
 }
@@ -2364,7 +2364,7 @@ static afatfsOperationStatus_e afatfs_allocateDirectoryEntry(afatfsFilePtr_t dir
  * Return a pointer to a free entry in the open files table (a file whose type is "NONE"). You should initialize
  * the file afterwards with afatfs_initFileHandle().
  */
-static afatfsFilePtr_t afatfs_allocateFileHandle()
+static afatfsFilePtr_t afatfs_allocateFileHandle(void)
 {
     for (int i = 0; i < AFATFS_MAX_OPEN_FILES; i++) {
         if (afatfs.openFiles[i].type == AFATFS_FILE_TYPE_NONE) {
@@ -3211,7 +3211,7 @@ static void afatfs_fileOperationContinue(afatfsFile_t *file)
 /**
  * Check files for pending operations and execute them.
  */
-static void afatfs_fileOperationsPoll()
+static void afatfs_fileOperationsPoll(void)
 {
     afatfs_fileOperationContinue(&afatfs.currentDirectory);
 
@@ -3229,7 +3229,7 @@ static void afatfs_fileOperationsPoll()
 /**
  * Return the available size of the freefile (used for files in contiguous append mode)
  */
-uint32_t afatfs_getContiguousFreeSpace()
+uint32_t afatfs_getContiguousFreeSpace(void)
 {
     return afatfs.freeFile.logicalSize;
 }
@@ -3238,7 +3238,7 @@ uint32_t afatfs_getContiguousFreeSpace()
  * Call to set up the initial state for finding the largest block of free space on the device whose corresponding FAT
  * sectors are themselves entirely free space (so the free space has dedicated FAT sectors of its own).
  */
-static void afatfs_findLargestContiguousFreeBlockBegin()
+static void afatfs_findLargestContiguousFreeBlockBegin(void)
 {
     // The first FAT sector has two reserved entries, so it isn't eligible for this search. Start at the next FAT sector.
     afatfs.initState.freeSpaceSearch.candidateStart = afatfs_fatEntriesPerSector();
@@ -3256,7 +3256,7 @@ static void afatfs_findLargestContiguousFreeBlockBegin()
  *     AFATFS_OPERATION_SUCCESS - When the search has finished and afatfs.initState.freeSpaceSearch has been updated with the details of the best gap.
  *     AFATFS_OPERATION_FAILURE - When a read error occured
  */
-static afatfsOperationStatus_e afatfs_findLargestContiguousFreeBlockContinue()
+static afatfsOperationStatus_e afatfs_findLargestContiguousFreeBlockContinue(void)
 {
     afatfsFreeSpaceSearch_t *opState = &afatfs.initState.freeSpaceSearch;
     uint32_t fatEntriesPerSector = afatfs_fatEntriesPerSector();
@@ -3361,7 +3361,7 @@ static void afatfs_introspecLogCreated(afatfsFile_t *file)
 
 #endif
 
-static void afatfs_initContinue()
+static void afatfs_initContinue(void)
 {
 #ifdef AFATFS_USE_FREEFILE
     afatfsOperationStatus_e status;
@@ -3491,7 +3491,7 @@ static void afatfs_initContinue()
  * Check to see if there are any pending operations on the filesystem and perform a little work (without waiting on the
  * sdcard). You must call this periodically.
  */
-void afatfs_poll()
+void afatfs_poll(void)
 {
     // Only attempt to continue FS operations if the card is present & ready, otherwise we would just be wasting time
     if (sdcard_poll()) {
@@ -3554,17 +3554,17 @@ void afatfs_sdcardProfilerCallback(sdcardBlockOperation_e operation, uint32_t bl
 
 #endif
 
-afatfsFilesystemState_e afatfs_getFilesystemState()
+afatfsFilesystemState_e afatfs_getFilesystemState(void)
 {
     return afatfs.filesystemState;
 }
 
-afatfsError_e afatfs_getLastError()
+afatfsError_e afatfs_getLastError(void)
 {
     return afatfs.lastError;
 }
 
-void afatfs_init()
+void afatfs_init(void)
 {
     afatfs.filesystemState = AFATFS_FILESYSTEM_STATE_INITIALIZATION;
     afatfs.initPhase = AFATFS_INITIALIZATION_READ_MBR;
@@ -3646,7 +3646,7 @@ bool afatfs_destroy(bool dirty)
 /**
  * Get a pessimistic estimate of the amount of buffer space that we have available to write to immediately.
  */
-uint32_t afatfs_getFreeBufferSpace()
+uint32_t afatfs_getFreeBufferSpace(void)
 {
     uint32_t result = 0;
     for (int i = 0; i < AFATFS_NUM_CACHE_SECTORS; i++) {
diff --git a/src/main/io/asyncfatfs/asyncfatfs.h b/src/main/io/asyncfatfs/asyncfatfs.h
index faeb7ea510..40cd7f27d7 100644
--- a/src/main/io/asyncfatfs/asyncfatfs.h
+++ b/src/main/io/asyncfatfs/asyncfatfs.h
@@ -58,7 +58,7 @@ typedef enum {
 } afatfsSeek_e;
 
 typedef void (*afatfsFileCallback_t)(afatfsFilePtr_t file);
-typedef void (*afatfsCallback_t)();
+typedef void (*afatfsCallback_t)(void);
 
 bool afatfs_fopen(const char *filename, const char *mode, afatfsFileCallback_t complete);
 bool afatfs_ftruncate(afatfsFilePtr_t file, afatfsFileCallback_t callback);
@@ -79,14 +79,14 @@ void afatfs_findFirst(afatfsFilePtr_t directory, afatfsFinder_t *finder);
 afatfsOperationStatus_e afatfs_findNext(afatfsFilePtr_t directory, afatfsFinder_t *finder, fatDirectoryEntry_t **dirEntry);
 void afatfs_findLast(afatfsFilePtr_t directory);
 
-bool afatfs_flush();
-void afatfs_init();
+bool afatfs_flush(void);
+void afatfs_init(void);
 bool afatfs_destroy(bool dirty);
-void afatfs_poll();
+void afatfs_poll(void);
 
-uint32_t afatfs_getFreeBufferSpace();
-uint32_t afatfs_getContiguousFreeSpace();
-bool afatfs_isFull();
+uint32_t afatfs_getFreeBufferSpace(void);
+uint32_t afatfs_getContiguousFreeSpace(void);
+bool afatfs_isFull(void);
 
-afatfsFilesystemState_e afatfs_getFilesystemState();
-afatfsError_e afatfs_getLastError();
+afatfsFilesystemState_e afatfs_getFilesystemState(void);
+afatfsError_e afatfs_getLastError(void);
diff --git a/src/main/io/dashboard.c b/src/main/io/dashboard.c
index c12b240eca..4d34a025a2 100644
--- a/src/main/io/dashboard.c
+++ b/src/main/io/dashboard.c
@@ -181,7 +181,7 @@ static void drawHorizonalPercentageBar(uint8_t width,uint8_t percent)
 }
 
 #if 0
-static void fillScreenWithCharacters()
+static void fillScreenWithCharacters(void)
 {
     for (uint8_t row = 0; row < SCREEN_CHARACTER_ROW_COUNT; row++) {
         for (uint8_t column = 0; column < SCREEN_CHARACTER_COLUMN_COUNT; column++) {
@@ -241,7 +241,7 @@ static void updateFailsafeStatus(void)
     i2c_OLED_send_char(bus, failsafeIndicator);
 }
 
-static void showTitle()
+static void showTitle(void)
 {
     i2c_OLED_set_line(bus, 0);
     i2c_OLED_send_string(bus, pageState.page->title);
@@ -346,7 +346,7 @@ static void showProfilePage(void)
 #define SATELLITE_GRAPH_LEFT_OFFSET ((SCREEN_CHARACTER_COLUMN_COUNT - SATELLITE_COUNT) / 2)
 
 #ifdef GPS
-static void showGpsPage()
+static void showGpsPage(void)
 {
     if (!feature(FEATURE_GPS)) {
         pageState.pageFlags |= PAGE_STATE_FLAG_FORCE_PAGE_CHANGE;
diff --git a/src/main/io/flashfs.c b/src/main/io/flashfs.c
index 5e346d1b82..3d0b882bef 100644
--- a/src/main/io/flashfs.c
+++ b/src/main/io/flashfs.c
@@ -52,12 +52,12 @@ static uint8_t bufferHead = 0, bufferTail = 0;
 // The position of the buffer's tail in the overall flash address space:
 static uint32_t tailAddress = 0;
 
-static void flashfsClearBuffer()
+static void flashfsClearBuffer(void)
 {
     bufferTail = bufferHead = 0;
 }
 
-static bool flashfsBufferIsEmpty()
+static bool flashfsBufferIsEmpty(void)
 {
     return bufferTail == bufferHead;
 }
@@ -67,7 +67,7 @@ static void flashfsSetTailAddress(uint32_t address)
     tailAddress = address;
 }
 
-void flashfsEraseCompletely()
+void flashfsEraseCompletely(void)
 {
     m25p16_eraseCompletely();
 
@@ -106,17 +106,17 @@ void flashfsEraseRange(uint32_t start, uint32_t end)
 /**
  * Return true if the flash is not currently occupied with an operation.
  */
-bool flashfsIsReady()
+bool flashfsIsReady(void)
 {
     return m25p16_isReady();
 }
 
-uint32_t flashfsGetSize()
+uint32_t flashfsGetSize(void)
 {
     return m25p16_getGeometry()->totalSize;
 }
 
-static uint32_t flashfsTransmitBufferUsed()
+static uint32_t flashfsTransmitBufferUsed(void)
 {
     if (bufferHead >= bufferTail)
         return bufferHead - bufferTail;
@@ -127,7 +127,7 @@ static uint32_t flashfsTransmitBufferUsed()
 /**
  * Get the size of the largest single write that flashfs could ever accept without blocking or data loss.
  */
-uint32_t flashfsGetWriteBufferSize()
+uint32_t flashfsGetWriteBufferSize(void)
 {
     return FLASHFS_WRITE_BUFFER_USABLE;
 }
@@ -135,12 +135,12 @@ uint32_t flashfsGetWriteBufferSize()
 /**
  * Get the number of bytes that can currently be written to flashfs without any blocking or data loss.
  */
-uint32_t flashfsGetWriteBufferFreeSpace()
+uint32_t flashfsGetWriteBufferFreeSpace(void)
 {
     return flashfsGetWriteBufferSize() - flashfsTransmitBufferUsed();
 }
 
-const flashGeometry_t* flashfsGetGeometry()
+const flashGeometry_t* flashfsGetGeometry(void)
 {
     return m25p16_getGeometry();
 }
@@ -270,7 +270,7 @@ static void flashfsGetDirtyDataBuffers(uint8_t const *buffers[], uint32_t buffer
 /**
  * Get the current offset of the file pointer within the volume.
  */
-uint32_t flashfsGetOffset()
+uint32_t flashfsGetOffset(void)
 {
     uint8_t const * buffers[2];
     uint32_t bufferSizes[2];
@@ -305,7 +305,7 @@ static void flashfsAdvanceTailInBuffer(uint32_t delta)
  * Returns true if all data in the buffer has been flushed to the device, or false if
  * there is still data to be written (call flush again later).
  */
-bool flashfsFlushAsync()
+bool flashfsFlushAsync(void)
 {
     if (flashfsBufferIsEmpty()) {
         return true; // Nothing to flush
@@ -328,7 +328,7 @@ bool flashfsFlushAsync()
  * The flash will still be busy some time after this sync completes, but space will
  * be freed up to accept more writes in the write buffer.
  */
-void flashfsFlushSync()
+void flashfsFlushSync(void)
 {
     if (flashfsBufferIsEmpty()) {
         return; // Nothing to flush
@@ -484,7 +484,7 @@ int flashfsReadAbs(uint32_t address, uint8_t *buffer, unsigned int len)
 /**
  * Find the offset of the start of the free space on the device (or the size of the device if it is full).
  */
-int flashfsIdentifyStartOfFreeSpace()
+int flashfsIdentifyStartOfFreeSpace(void)
 {
     /* Find the start of the free space on the device by examining the beginning of blocks with a binary search,
      * looking for ones that appear to be erased. We can achieve this with good accuracy because an erased block
@@ -553,14 +553,15 @@ int flashfsIdentifyStartOfFreeSpace()
 /**
  * Returns true if the file pointer is at the end of the device.
  */
-bool flashfsIsEOF() {
+bool flashfsIsEOF(void)
+{
     return tailAddress >= flashfsGetSize();
 }
 
 /**
  * Call after initializing the flash chip in order to set up the filesystem.
  */
-void flashfsInit()
+void flashfsInit(void)
 {
     // If we have a flash chip present at all
     if (flashfsGetSize() > 0) {
diff --git a/src/main/io/flashfs.h b/src/main/io/flashfs.h
index 90f1ca9e57..216c8c22e0 100644
--- a/src/main/io/flashfs.h
+++ b/src/main/io/flashfs.h
@@ -23,16 +23,16 @@
 // Automatically trigger a flush when this much data is in the buffer
 #define FLASHFS_WRITE_BUFFER_AUTO_FLUSH_LEN 64
 
-void flashfsEraseCompletely();
+void flashfsEraseCompletely(void);
 void flashfsEraseRange(uint32_t start, uint32_t end);
 
-uint32_t flashfsGetSize();
-uint32_t flashfsGetOffset();
-uint32_t flashfsGetWriteBufferFreeSpace();
-uint32_t flashfsGetWriteBufferSize();
-int flashfsIdentifyStartOfFreeSpace();
+uint32_t flashfsGetSize(void);
+uint32_t flashfsGetOffset(void);
+uint32_t flashfsGetWriteBufferFreeSpace(void);
+uint32_t flashfsGetWriteBufferSize(void);
+int flashfsIdentifyStartOfFreeSpace(void);
 struct flashGeometry_s;
-const struct flashGeometry_s* flashfsGetGeometry();
+const struct flashGeometry_s* flashfsGetGeometry(void);
 
 void flashfsSeekAbs(uint32_t offset);
 void flashfsSeekRel(int32_t offset);
@@ -42,10 +42,10 @@ void flashfsWrite(const uint8_t *data, unsigned int len, bool sync);
 
 int flashfsReadAbs(uint32_t offset, uint8_t *data, unsigned int len);
 
-bool flashfsFlushAsync();
-void flashfsFlushSync();
+bool flashfsFlushAsync(void);
+void flashfsFlushSync(void);
 
-void flashfsInit();
+void flashfsInit(void);
 
-bool flashfsIsReady();
-bool flashfsIsEOF();
+bool flashfsIsReady(void);
+bool flashfsIsEOF(void);
diff --git a/src/main/io/ledstrip.c b/src/main/io/ledstrip.c
index 2f6437ef28..607cd5dd9f 100644
--- a/src/main/io/ledstrip.c
+++ b/src/main/io/ledstrip.c
@@ -441,7 +441,7 @@ static const struct {
     {0,             LED_MODE_ORIENTATION},
 };
 
-static void applyLedFixedLayers()
+static void applyLedFixedLayers(void)
 {
     for (int ledIndex = 0; ledIndex < ledCounts.count; ledIndex++) {
         const ledConfig_t *ledConfig = &ledStripConfig()->ledConfigs[ledIndex];
@@ -1146,7 +1146,7 @@ bool setModeColor(ledModeIndex_e modeIndex, int modeColorIndex, int colorIndex)
     return true;
 }
 
-void ledStripInit()
+void ledStripInit(void)
 {
     colors = ledStripConfigMutable()->colors;
     modeColors = ledStripConfig()->modeColors;
diff --git a/src/main/io/osd.c b/src/main/io/osd.c
index f8478aa5c8..8be67ee857 100755
--- a/src/main/io/osd.c
+++ b/src/main/io/osd.c
@@ -163,7 +163,7 @@ static escSensorData_t *escData;
 /**
  * Gets the correct altitude symbol for the current unit system
  */
-static char osdGetMetersToSelectedUnitSymbol()
+static char osdGetMetersToSelectedUnitSymbol(void)
 {
     switch (osdConfig()->units) {
     case OSD_UNIT_IMPERIAL:
diff --git a/src/main/io/rcsplit.c b/src/main/io/rcsplit.c
index d567b2afd6..aada0181ab 100644
--- a/src/main/io/rcsplit.c
+++ b/src/main/io/rcsplit.c
@@ -83,7 +83,7 @@ static void sendCtrlCommand(rcsplit_ctrl_argument_e argument)
     serialWriteBuf(rcSplitSerialPort, uart_buffer, 5);
 }
 
-static void rcSplitProcessMode()
+static void rcSplitProcessMode(void)
 {
     // if the device not ready, do not handle any mode change event
     if (RCSPLIT_STATE_IS_READY != cameraState)
diff --git a/src/main/io/vtx_rtc6705.h b/src/main/io/vtx_rtc6705.h
index 9a48a8aa03..1e304f682b 100644
--- a/src/main/io/vtx_rtc6705.h
+++ b/src/main/io/vtx_rtc6705.h
@@ -41,4 +41,4 @@ PG_DECLARE(vtxRTC6705Config_t, vtxRTC6705Config);
 extern const char * const rtc6705PowerNames[RTC6705_POWER_COUNT];
 
 void vtxRTC6705Configure(void);
-bool vtxRTC6705Init();
+bool vtxRTC6705Init(void);
diff --git a/src/main/io/vtx_smartaudio.c b/src/main/io/vtx_smartaudio.c
index 1fadb13685..d71e783da9 100644
--- a/src/main/io/vtx_smartaudio.c
+++ b/src/main/io/vtx_smartaudio.c
@@ -491,7 +491,7 @@ static uint8_t sa_qhead = 0;
 static uint8_t sa_qtail = 0;
 
 #ifdef DPRINTF_SMARTAUDIO
-static int saQueueLength()
+static int saQueueLength(void)
 {
     if (sa_qhead >= sa_qtail) {
         return sa_qhead - sa_qtail;
@@ -501,12 +501,12 @@ static int saQueueLength()
 }
 #endif
 
-static bool saQueueEmpty()
+static bool saQueueEmpty(void)
 {
     return sa_qhead == sa_qtail;
 }
 
-static bool saQueueFull()
+static bool saQueueFull(void)
 {
     return ((sa_qhead + 1) % SA_QSIZE) == sa_qtail;
 }
@@ -609,7 +609,7 @@ void saSetPowerByIndex(uint8_t index)
     saQueueCmd(buf, 6);
 }
 
-bool vtxSmartAudioInit()
+bool vtxSmartAudioInit(void)
 {
 #ifdef SMARTAUDIO_DPRINTF
     // Setup debugSerialPort
diff --git a/src/main/io/vtx_smartaudio.h b/src/main/io/vtx_smartaudio.h
index 0fd31dad80..8cbd0fc9b7 100644
--- a/src/main/io/vtx_smartaudio.h
+++ b/src/main/io/vtx_smartaudio.h
@@ -60,7 +60,7 @@ void saSetBandAndChannel(uint8_t band, uint8_t channel);
 void saSetMode(int mode);
 void saSetPowerByIndex(uint8_t index);
 void saSetFreq(uint16_t freq);
-bool vtxSmartAudioInit();
+bool vtxSmartAudioInit(void);
 
 #ifdef SMARTAUDIO_DPRINTF
 #ifdef OMNIBUSF4
diff --git a/src/main/io/vtx_tramp.c b/src/main/io/vtx_tramp.c
index 73eaef16db..53dabdf7bd 100644
--- a/src/main/io/vtx_tramp.c
+++ b/src/main/io/vtx_tramp.c
@@ -157,7 +157,7 @@ void trampSendRFPower(uint16_t level)
 }
 
 // return false if error
-bool trampCommitChanges()
+bool trampCommitChanges(void)
 {
     if (trampStatus != TRAMP_STATUS_ONLINE)
         return false;
@@ -233,7 +233,7 @@ typedef enum {
 static trampReceiveState_e trampReceiveState = S_WAIT_LEN;
 static int trampReceivePos = 0;
 
-static void trampResetReceiver()
+static void trampResetReceiver(void)
 {
     trampReceiveState = S_WAIT_LEN;
     trampReceivePos = 0;
diff --git a/src/main/io/vtx_tramp.h b/src/main/io/vtx_tramp.h
index 094f2b0d75..3e388e1b05 100644
--- a/src/main/io/vtx_tramp.h
+++ b/src/main/io/vtx_tramp.h
@@ -12,8 +12,8 @@ extern uint32_t trampCurFreq;
 extern uint16_t trampConfiguredPower; // Configured transmitting power
 extern int16_t trampTemperature;
 
-bool vtxTrampInit();
-bool trampCommitChanges();
+bool vtxTrampInit(void);
+bool trampCommitChanges(void);
 void trampSetPitMode(uint8_t onoff);
 void trampSetBandAndChannel(uint8_t band, uint8_t channel);
 void trampSetRFPower(uint16_t level);
diff --git a/src/main/msp/msp_serial.c b/src/main/msp/msp_serial.c
index 7e05410cfc..9500296b40 100644
--- a/src/main/msp/msp_serial.c
+++ b/src/main/msp/msp_serial.c
@@ -301,7 +301,7 @@ int mspSerialPush(uint8_t cmd, uint8_t *data, int datalen, mspDirection_e direct
 }
 
 
-uint32_t mspSerialTxBytesFree()
+uint32_t mspSerialTxBytesFree(void)
 {
     uint32_t ret = UINT32_MAX;
 
diff --git a/src/main/rx/frsky_d.c b/src/main/rx/frsky_d.c
index f93c33a503..4308440d61 100644
--- a/src/main/rx/frsky_d.c
+++ b/src/main/rx/frsky_d.c
@@ -193,25 +193,25 @@ static void telemetry_build_frame(uint8_t *packet)
 #endif
 
 #if defined(USE_FRSKY_RX_PA_LNA)
-static void RX_enable()
+static void RX_enable(void)
 {
     IOLo(txEnPin);
     IOHi(rxEnPin);
 }
 
-static void TX_enable()
+static void TX_enable(void)
 {
     IOLo(rxEnPin);
     IOHi(txEnPin);
 }
 #endif
 
-void frSkyDBind()
+void frSkyDBind(void)
 {
     bindRequested = true;
 }
 
-static void initialize()
+static void initialize(void)
 {
     cc2500Reset();
     cc2500WriteReg(CC2500_02_IOCFG0, 0x01);
diff --git a/src/main/rx/frsky_d.h b/src/main/rx/frsky_d.h
index d7c661b130..c565f8943f 100644
--- a/src/main/rx/frsky_d.h
+++ b/src/main/rx/frsky_d.h
@@ -36,4 +36,4 @@ struct rxRuntimeConfig_s;
 void frSkyDInit(const struct rxConfig_s *rxConfig, struct rxRuntimeConfig_s *rxRuntimeConfig);
 void frSkyDSetRcData(uint16_t *rcData, const uint8_t *payload);
 rx_spi_received_e frSkyDDataReceived(uint8_t *payload);
-void frSkyDBind();
+void frSkyDBind(void);
diff --git a/src/main/rx/jetiexbus.c b/src/main/rx/jetiexbus.c
index 4f13e61fbe..f83070792e 100644
--- a/src/main/rx/jetiexbus.c
+++ b/src/main/rx/jetiexbus.c
@@ -281,7 +281,7 @@ void jetiExBusDecodeChannelFrame(uint8_t *exBusFrame)
 }
 
 
-void jetiExBusFrameReset()
+void jetiExBusFrameReset(void)
 {
     jetiExBusFramePosition = 0;
     jetiExBusFrameLength = EXBUS_MAX_CHANNEL_FRAME_SIZE;
@@ -376,7 +376,7 @@ static void jetiExBusDataReceive(uint16_t c)
 
 
 // Check if it is time to read a frame from the data...
-static uint8_t jetiExBusFrameStatus()
+static uint8_t jetiExBusFrameStatus(void)
 {
     if (jetiExBusFrameState != EXBUS_STATE_RECEIVED)
         return RX_FRAME_PENDING;
diff --git a/src/main/sensors/gyroanalyse.c b/src/main/sensors/gyroanalyse.c
index b680a131b3..dd741bc973 100644
--- a/src/main/sensors/gyroanalyse.c
+++ b/src/main/sensors/gyroanalyse.c
@@ -86,14 +86,14 @@ static biquadFilter_t fftFreqFilter[3];
 // Hanning window, see https://en.wikipedia.org/wiki/Window_function#Hann_.28Hanning.29_window
 static float hanningWindow[FFT_WINDOW_SIZE];
 
-void initHanning()
+void initHanning(void)
 {
     for (int i = 0; i < FFT_WINDOW_SIZE; i++) {
         hanningWindow[i] = (0.5 - 0.5 * cosf(2 * M_PIf * i / (FFT_WINDOW_SIZE - 1)));
     }
 }
 
-void initGyroData()
+void initGyroData(void)
 {
     for (int axis = 0; axis < XYZ_AXIS_COUNT; axis++) {
         for (int i = 0; i < FFT_WINDOW_SIZE; i++) {
diff --git a/src/main/sensors/gyroanalyse.h b/src/main/sensors/gyroanalyse.h
index ac4290738a..a4a64cd431 100644
--- a/src/main/sensors/gyroanalyse.h
+++ b/src/main/sensors/gyroanalyse.h
@@ -31,4 +31,4 @@ const gyroFftData_t *gyroFftData(int axis);
 struct gyroDev_s;
 void gyroDataAnalyse(const struct gyroDev_s *gyroDev, biquadFilter_t *notchFilterDyn);
 void gyroDataAnalyseUpdate(biquadFilter_t *notchFilterDyn);
-bool isDynamicFilterActive();
+bool isDynamicFilterActive(void);
diff --git a/src/main/target/COLIBRI_RACE/bus_bst_stm32f30x.c b/src/main/target/COLIBRI_RACE/bus_bst_stm32f30x.c
index 2b18e740cd..cf87516a87 100644
--- a/src/main/target/COLIBRI_RACE/bus_bst_stm32f30x.c
+++ b/src/main/target/COLIBRI_RACE/bus_bst_stm32f30x.c
@@ -71,7 +71,7 @@ uint8_t interruptCounter = 0;
 #define DELAY_SENDING_BYTE    40
 
 void bstProcessInCommand(void);
-void I2C_EV_IRQHandler()
+void I2C_EV_IRQHandler(void)
 {
     if (I2C_GetITStatus(BSTx, I2C_IT_ADDR)) {
         CRC8 = 0;
@@ -154,17 +154,17 @@ void I2C_EV_IRQHandler()
     }
 }
 
-void I2C1_EV_IRQHandler()
+void I2C1_EV_IRQHandler(void)
 {
     I2C_EV_IRQHandler();
 }
 
-void I2C2_EV_IRQHandler()
+void I2C2_EV_IRQHandler(void)
 {
     I2C_EV_IRQHandler();
 }
 
-uint32_t bstTimeoutUserCallback()
+uint32_t bstTimeoutUserCallback(void)
 {
     bstErrorCount++;
 
diff --git a/src/main/target/SITL/target.h b/src/main/target/SITL/target.h
index 9bb9b4a327..e5ccbc57e0 100644
--- a/src/main/target/SITL/target.h
+++ b/src/main/target/SITL/target.h
@@ -250,11 +250,11 @@ void FLASH_Lock(void);
 FLASH_Status FLASH_ErasePage(uintptr_t Page_Address);
 FLASH_Status FLASH_ProgramWord(uintptr_t addr, uint32_t Data);
 
-uint64_t nanos64_real();
-uint64_t micros64_real();
-uint64_t millis64_real();
+uint64_t nanos64_real(void);
+uint64_t micros64_real(void);
+uint64_t millis64_real(void);
 void delayMicroseconds_real(uint32_t us);
-uint64_t micros64();
-uint64_t millis64();
+uint64_t micros64(void);
+uint64_t millis64(void);
 
 int lockMainPID(void);
diff --git a/src/main/telemetry/hott.c b/src/main/telemetry/hott.c
index 27d84c223a..a956aebfcb 100644
--- a/src/main/telemetry/hott.c
+++ b/src/main/telemetry/hott.c
@@ -527,7 +527,7 @@ static inline bool shouldPrepareHoTTMessages(uint32_t currentMicros)
     return currentMicros - lastMessagesPreparedAt >= HOTT_MESSAGE_PREPARATION_FREQUENCY_5_HZ;
 }
 
-static inline bool shouldCheckForHoTTRequest()
+static inline bool shouldCheckForHoTTRequest(void)
 {
     if (hottIsSending) {
         return false;
diff --git a/src/main/telemetry/ltm.c b/src/main/telemetry/ltm.c
index c4cfed8188..4292d386f9 100644
--- a/src/main/telemetry/ltm.c
+++ b/src/main/telemetry/ltm.c
@@ -202,7 +202,7 @@ static void ltm_sframe(void)
  * Attitude A-frame - 10 Hz at > 2400 baud
  *  PITCH ROLL HEADING
  */
-static void ltm_aframe()
+static void ltm_aframe(void)
 {
     ltm_initialise_packet('A');
     ltm_serialise_16(DECIDEGREES_TO_DEGREES(attitude.values.pitch));
@@ -216,7 +216,7 @@ static void ltm_aframe()
  *  This frame will be ignored by Ghettostation, but processed by GhettOSD if it is used as standalone onboard OSD
  *  home pos, home alt, direction to home
  */
-static void ltm_oframe()
+static void ltm_oframe(void)
 {
     ltm_initialise_packet('O');
 #if defined(GPS)
diff --git a/src/main/vcp/usb_pwr.c b/src/main/vcp/usb_pwr.c
index 8cdd7eb3d1..e383ab2c81 100644
--- a/src/main/vcp/usb_pwr.c
+++ b/src/main/vcp/usb_pwr.c
@@ -88,7 +88,7 @@ RESULT PowerOn(void)
  * Output         : None.
  * Return         : USB_SUCCESS.
  *******************************************************************************/
-RESULT PowerOff()
+RESULT PowerOff(void)
 {
     /* disable all interrupts and force USB reset */
     _SetCNTR(CNTR_FRES);