diff --git a/src/main/drivers/accgyro_mpu.c b/src/main/drivers/accgyro_mpu.c
index 51cdcc7dc..f5cd4a2d0 100644
--- a/src/main/drivers/accgyro_mpu.c
+++ b/src/main/drivers/accgyro_mpu.c
@@ -259,7 +259,7 @@ void mpuIntExtiInit(void)
 #if defined (STM32F7)
     IOInit(mpuIntIO, OWNER_MPU, RESOURCE_EXTI, 0);
     EXTIHandlerInit(&mpuIntCallbackRec, mpuIntExtiHandler);
-    EXTIConfig(mpuIntIO, &mpuIntCallbackRec, NVIC_PRIO_MPU_INT_EXTI, IO_CONFIG(GPIO_MODE_IT_RISING,0,GPIO_NOPULL));   // TODO - maybe pullup / pulldown ?
+    EXTIConfig(mpuIntIO, &mpuIntCallbackRec, NVIC_PRIO_MPU_INT_EXTI, IO_CONFIG(GPIO_MODE_INPUT,0,GPIO_NOPULL));   // TODO - maybe pullup / pulldown ?
 #else
 
     IOInit(mpuIntIO, OWNER_MPU, RESOURCE_EXTI, 0);
diff --git a/src/main/drivers/bus_i2c_hal.c b/src/main/drivers/bus_i2c_hal.c
index 6667f5c40..701128d4d 100644
--- a/src/main/drivers/bus_i2c_hal.c
+++ b/src/main/drivers/bus_i2c_hal.c
@@ -34,8 +34,6 @@
 
 #define CLOCKSPEED 800000    // i2c clockspeed 400kHz default (conform specs), 800kHz  and  1200kHz (Betaflight default)
 
-static void i2c_er_handler(I2CDevice device);
-static void i2c_ev_handler(I2CDevice device);
 static void i2cUnstick(IO_t scl, IO_t sda);
 
 #define IOCFG_I2C IOCFG_AF_OD
@@ -132,6 +130,7 @@ void i2cSetOverclock(uint8_t OverClock) {
 
 static bool i2cHandleHardwareFailure(I2CDevice device)
 {
+    (void)device;
     i2cErrorCount++;
     // reinit peripheral + clock out garbage
     //i2cInit(device);
@@ -203,7 +202,7 @@ void i2cInit(I2CDevice device)
         i2cDevice_t *i2c;
         i2c = &(i2cHardwareMap[device]);
 
-        I2C_InitTypeDef i2cInit;
+        //I2C_InitTypeDef i2cInit;
 
         IO_t scl = IOGetByTag(i2c->scl);
         IO_t sda = IOGetByTag(i2c->sda);
diff --git a/src/main/drivers/exti.c b/src/main/drivers/exti.c
index a43d78da9..bc783cc45 100644
--- a/src/main/drivers/exti.c
+++ b/src/main/drivers/exti.c
@@ -69,6 +69,7 @@ void EXTIHandlerInit(extiCallbackRec_t *self, extiHandlerCallback *fn)
 #if defined(STM32F7)
 void EXTIConfig(IO_t io, extiCallbackRec_t *cb, int irqPriority, ioConfig_t config)
 {
+    (void)config;
     int chIdx;
     chIdx = IO_GPIOPinIdx(io);
     if(chIdx < 0)
@@ -85,7 +86,7 @@ void EXTIConfig(IO_t io, extiCallbackRec_t *cb, int irqPriority, ioConfig_t conf
     HAL_GPIO_Init(IO_GPIO(io), &init);
 
     rec->handler = cb;
-    uint32_t extiLine = IO_EXTI_Line(io);
+    //uint32_t extiLine = IO_EXTI_Line(io);
 
     //EXTI_ClearITPendingBit(extiLine);
 
@@ -164,6 +165,8 @@ void EXTIEnable(IO_t io, bool enable)
     else
         EXTI->IMR &= ~extiLine;
 #elif defined(STM32F7)
+    (void)io;
+    (void)enable;
 #elif defined(STM32F303xC)
     int extiLine = IO_EXTI_Line(io);
     if(extiLine < 0)
@@ -203,7 +206,7 @@ void EXTI_IRQHandler(void)
 
 _EXTI_IRQ_HANDLER(EXTI0_IRQHandler);
 _EXTI_IRQ_HANDLER(EXTI1_IRQHandler);
-#if defined(STM32F1)
+#if defined(STM32F1) || defined(STM32F7)
 _EXTI_IRQ_HANDLER(EXTI2_IRQHandler);
 #elif defined(STM32F3) || defined(STM32F4)
 _EXTI_IRQ_HANDLER(EXTI2_TS_IRQHandler);
diff --git a/src/main/drivers/gpio_stm32f7xx.c b/src/main/drivers/gpio_stm32f7xx.c
index 91062e4e6..e6a18ba1f 100644
--- a/src/main/drivers/gpio_stm32f7xx.c
+++ b/src/main/drivers/gpio_stm32f7xx.c
@@ -65,5 +65,7 @@ void gpioInit(GPIO_TypeDef *gpio, gpio_config_t *config)
 
 void gpioExtiLineConfig(uint8_t portsrc, uint8_t pinsrc)
 {
+    (void)portsrc;
+    (void)pinsrc;
     //SYSCFG_EXTILineConfig(portsrc, pinsrc);
 }
diff --git a/src/main/drivers/io.c b/src/main/drivers/io.c
index 71dde30d4..5104e5cf7 100644
--- a/src/main/drivers/io.c
+++ b/src/main/drivers/io.c
@@ -214,6 +214,7 @@ void IOToggle(IO_t io)
     // high in the mask value rather than all pins. XORing ODR directly risks
     // setting other pins incorrectly because it change all pins' state.
 #if defined(USE_HAL_DRIVER)
+    (void)mask;
     HAL_GPIO_TogglePin(IO_GPIO(io),IO_Pin(io));
 #elif defined(STM32F4)
     if (IO_GPIO(io)->ODR & mask) {
diff --git a/src/main/drivers/rcc.c b/src/main/drivers/rcc.c
index 4e23d093e..7047a0181 100644
--- a/src/main/drivers/rcc.c
+++ b/src/main/drivers/rcc.c
@@ -7,6 +7,9 @@ void RCC_ClockCmd(rccPeriphTag_t periphTag, FunctionalState NewState)
     int tag = periphTag >> 5;
     uint32_t mask = 1 << (periphTag & 0x1f);
 #if defined(USE_HAL_DRIVER)
+    (void)tag;
+    (void)mask;
+    (void)NewState;
 #else
     switch (tag) {
 #if defined(STM32F3) || defined(STM32F1)
@@ -34,6 +37,9 @@ void RCC_ResetCmd(rccPeriphTag_t periphTag, FunctionalState NewState)
     int tag = periphTag >> 5;
     uint32_t mask = 1 << (periphTag & 0x1f);
 #if defined(USE_HAL_DRIVER)
+    (void)tag;
+    (void)mask;
+    (void)NewState;
 #else
     switch (tag) {
 #if defined(STM32F3) || defined(STM32F10X_CL)
diff --git a/src/main/drivers/serial_uart_hal.c b/src/main/drivers/serial_uart_hal.c
index 155f98025..6a0d32c65 100644
--- a/src/main/drivers/serial_uart_hal.c
+++ b/src/main/drivers/serial_uart_hal.c
@@ -57,7 +57,7 @@ static void usartConfigurePinInversion(uartPort_t *uartPort) {
 
 static void uartReconfigure(uartPort_t *uartPort)
 {
-    HAL_StatusTypeDef status;
+    HAL_StatusTypeDef status = HAL_ERROR;
     /*RCC_PeriphCLKInitTypeDef RCC_PeriphClkInit;
     RCC_PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1|RCC_PERIPHCLK_USART2|RCC_PERIPHCLK_USART3|
             RCC_PERIPHCLK_UART4|RCC_PERIPHCLK_UART5|RCC_PERIPHCLK_USART6|RCC_PERIPHCLK_UART7|RCC_PERIPHCLK_UART8;
@@ -176,7 +176,7 @@ serialPort_t *uartOpen(USART_TypeDef *USARTx, serialReceiveCallbackPtr callback,
             /* Associate the initialized DMA handle to the UART handle */
             __HAL_LINKDMA(&s->Handle, hdmarx, s->rxDMAHandle);
             
-            HAL_UART_Receive_DMA(&s->Handle, (uint32_t)s->port.rxBuffer, s->port.rxBufferSize);
+            HAL_UART_Receive_DMA(&s->Handle, (uint8_t*)s->port.rxBuffer, s->port.rxBufferSize);
 
             s->rxDMAPos = __HAL_DMA_GET_COUNTER(&s->rxDMAHandle);
 
@@ -185,7 +185,7 @@ serialPort_t *uartOpen(USART_TypeDef *USARTx, serialReceiveCallbackPtr callback,
         {
 //            __HAL_UART_CLEAR_IT(&cfg.uartport->Handle, UART_FLAG_RXNE);
 //            __HAL_UART_ENABLE_IT(&cfg.uartport->Handle, UART_IT_RXNE);
-            HAL_UART_Receive_IT(&s->Handle, (uint32_t)s->port.rxBuffer, s->port.rxBufferSize);
+            HAL_UART_Receive_IT(&s->Handle, (uint8_t*)s->port.rxBuffer, s->port.rxBufferSize);
         }
     }
 
diff --git a/src/main/drivers/system_stm32f7xx.c b/src/main/drivers/system_stm32f7xx.c
index 311caa1cf..b19bbbdab 100644
--- a/src/main/drivers/system_stm32f7xx.c
+++ b/src/main/drivers/system_stm32f7xx.c
@@ -170,7 +170,7 @@ void systemInit(void)
     cachedRccCsrValue = RCC->CSR;
 
     /* Accounts for OP Bootloader, set the Vector Table base address as specified in .ld file */
-    extern void *isr_vector_table_base;
+    //extern void *isr_vector_table_base;
     //NVIC_SetVectorTable((uint32_t)&isr_vector_table_base, 0x0);
     //__HAL_RCC_USB_OTG_FS_CLK_DISABLE;
 
diff --git a/src/main/drivers/timer.h b/src/main/drivers/timer.h
index 007d4d325..d3bec2e7c 100644
--- a/src/main/drivers/timer.h
+++ b/src/main/drivers/timer.h
@@ -169,4 +169,8 @@ void configTimeBase(TIM_TypeDef *tim, uint16_t period, uint8_t mhz);  // TODO -
 
 rccPeriphTag_t timerRCC(TIM_TypeDef *tim);
 
-const timerHardware_t *timerGetByTag(ioTag_t tag, timerFlag_e flag);
\ No newline at end of file
+const timerHardware_t *timerGetByTag(ioTag_t tag, timerFlag_e flag);
+
+#if defined(USE_HAL_DRIVER)
+TIM_HandleTypeDef* timerFindTimerHandle(TIM_TypeDef *tim);
+#endif
diff --git a/src/main/vcp_hal/usbd_desc.c b/src/main/vcp_hal/usbd_desc.c
index 0987b4942..d79eba51e 100644
--- a/src/main/vcp_hal/usbd_desc.c
+++ b/src/main/vcp_hal/usbd_desc.c
@@ -146,6 +146,7 @@ static void Get_SerialNum(void);
   */
 uint8_t *USBD_VCP_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
 {
+  (void)speed;
   *length = sizeof(USBD_DeviceDesc);
   return (uint8_t*)USBD_DeviceDesc;
 }
@@ -158,6 +159,7 @@ uint8_t *USBD_VCP_DeviceDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
   */
 uint8_t *USBD_VCP_LangIDStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
 {
+  (void)speed;
   *length = sizeof(USBD_LangIDDesc);  
   return (uint8_t*)USBD_LangIDDesc;
 }
@@ -189,6 +191,7 @@ uint8_t *USBD_VCP_ProductStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length
   */
 uint8_t *USBD_VCP_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
 {
+  (void)speed;
   USBD_GetString((uint8_t *)USBD_MANUFACTURER_STRING, USBD_StrDesc, length);
   return USBD_StrDesc;
 }
@@ -201,6 +204,7 @@ uint8_t *USBD_VCP_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *l
   */
 uint8_t *USBD_VCP_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
 {
+  (void)speed;
   *length = USB_SIZ_STRING_SERIAL;
   
   /* Update the serial number string descriptor with the data from the unique ID*/