diff --git a/.github/workflows/build_iar.yml b/.github/workflows/build_iar.yml
index 83e81164a..7e42a66f8 100644
--- a/.github/workflows/build_iar.yml
+++ b/.github/workflows/build_iar.yml
@@ -32,7 +32,7 @@ jobs:
         # Alphabetical order
         # Note: bundle multiple families into a matrix since there is only one self-hosted instance can
         # run IAR build. Too many matrix can hurt due to setup/teardown overhead.
-        - 'stm32f0 stm32f1 stm32f4 stm32f7 stm32g4 stm32h7 stm32l4'
+        - 'stm32f0 stm32f1 stm32f7 stm32h7 stm32l4'
     steps:
     - name: Clean workspace
       run: |
diff --git a/examples/device/audio_test_multi_rate/src/main.c b/examples/device/audio_test_multi_rate/src/main.c
index 4dd53dd34..078e783eb 100644
--- a/examples/device/audio_test_multi_rate/src/main.c
+++ b/examples/device/audio_test_multi_rate/src/main.c
@@ -268,7 +268,7 @@ bool tud_audio_set_req_entity_cb(uint8_t rhport, tusb_control_request_t const *
 
         sampFreq = (uint32_t)((audio_control_cur_4_t *)pBuff)->bCur;
 
-        TU_LOG2("Clock set current freq: %d\r\n", sampFreq);
+        TU_LOG2("Clock set current freq: %lu\r\n", sampFreq);
 
         return true;
       break;
diff --git a/examples/host/msc_file_explorer/CMakeLists.txt b/examples/host/msc_file_explorer/CMakeLists.txt
index 2d5600059..327d1218a 100644
--- a/examples/host/msc_file_explorer/CMakeLists.txt
+++ b/examples/host/msc_file_explorer/CMakeLists.txt
@@ -21,6 +21,13 @@ target_sources(${PROJECT} PUBLIC
   ${TOP}/lib/fatfs/source/ffunicode.c
   )
 
+# Suppress warnings on fatfs
+set_source_files_properties(
+  ${TOP}/lib/fatfs/source/ff.c
+  PROPERTIES
+  COMPILE_FLAGS "-Wno-conversion -Wno-cast-qual"
+)
+
 # Example include
 target_include_directories(${PROJECT} PUBLIC
   ${CMAKE_CURRENT_SOURCE_DIR}/src
diff --git a/examples/rules.mk b/examples/rules.mk
index f6422092a..5727ab7e3 100644
--- a/examples/rules.mk
+++ b/examples/rules.mk
@@ -28,6 +28,7 @@ SRC_C += \
 	src/common/tusb_fifo.c \
 	src/device/usbd.c \
 	src/device/usbd_control.c \
+	src/typec/usbc.c \
 	src/class/audio/audio_device.c \
 	src/class/cdc/cdc_device.c \
 	src/class/dfu/dfu_device.c \
diff --git a/examples/typec/power_delivery/src/main.c b/examples/typec/power_delivery/src/main.c
index 342a2235f..08590aa74 100644
--- a/examples/typec/power_delivery/src/main.c
+++ b/examples/typec/power_delivery/src/main.c
@@ -63,9 +63,6 @@ int main(void)
 
   tuc_init(0, TUSB_TYPEC_PORT_SNK);
 
-  uint32_t start_ms = 0;
-  bool led_state = false;
-
   while (1) {
     led_blinking_task();
 
@@ -155,6 +152,7 @@ bool tuc_pd_data_received_cb(uint8_t rhport, pd_header_t const* header, uint8_t
 }
 
 bool tuc_pd_control_received_cb(uint8_t rhport, pd_header_t const* header) {
+  (void) rhport;
   switch (header->msg_type) {
     case PD_CTRL_ACCEPT:
       printf("PD Request Accepted\r\n");
diff --git a/hw/bsp/family_support.cmake b/hw/bsp/family_support.cmake
index 0132ef629..ec36df5c8 100644
--- a/hw/bsp/family_support.cmake
+++ b/hw/bsp/family_support.cmake
@@ -19,6 +19,33 @@ if (NOT EXISTS ${CMAKE_CURRENT_LIST_DIR}/${FAMILY}/family.cmake)
   message(FATAL_ERROR "Family '${FAMILY}' is not known/supported")
 endif()
 
+set(WARNING_FLAGS_GNU
+  -Wall
+  -Wextra
+  -Werror
+  -Wfatal-errors
+  -Wdouble-promotion
+  -Wstrict-prototypes
+  -Wstrict-overflow
+  -Werror-implicit-function-declaration
+  -Wfloat-equal
+  -Wundef
+  -Wshadow
+  -Wwrite-strings
+  -Wsign-compare
+  -Wmissing-format-attribute
+  -Wunreachable-code
+  -Wcast-align
+  -Wcast-function-type
+  -Wcast-qual
+  -Wnull-dereference
+  -Wuninitialized
+  -Wunused
+  -Wreturn-type
+  -Wredundant-decls
+  )
+
+set(WARNINGS_FLAGS_IAR "")
 
 function(family_filter RESULT DIR)
   get_filename_component(DIR ${DIR} ABSOLUTE BASE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
@@ -121,6 +148,8 @@ function(family_configure_common TARGET)
     COMMAND ${CMAKE_SIZE} $<TARGET_FILE:${TARGET}>
     )
 
+  target_compile_options(${TARGET} PUBLIC ${WARNING_FLAGS_${CMAKE_C_COMPILER_ID}})
+
   if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
     # Generate map file
     target_link_options(${TARGET} PUBLIC
diff --git a/hw/bsp/imxrt/family.c b/hw/bsp/imxrt/family.c
index 46adabf0a..735fbdb9b 100644
--- a/hw/bsp/imxrt/family.c
+++ b/hw/bsp/imxrt/family.c
@@ -26,12 +26,23 @@
 
 #include "bsp/board.h"
 #include "board.h"
+
+// Suppress warning caused by mcu driver
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
 #include "fsl_device_registers.h"
 #include "fsl_gpio.h"
 #include "fsl_iomuxc.h"
 #include "fsl_clock.h"
 #include "fsl_lpuart.h"
 
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
 #include "clock_config.h"
 
 #if defined(BOARD_TUD_RHPORT) && CFG_TUD_ENABLED
diff --git a/hw/bsp/lpc55/family.cmake b/hw/bsp/lpc55/family.cmake
index 43fbe8638..9f6b1f63d 100644
--- a/hw/bsp/lpc55/family.cmake
+++ b/hw/bsp/lpc55/family.cmake
@@ -102,6 +102,7 @@ function(family_configure_example TARGET)
     # external driver
     ${TOP}/lib/sct_neopixel/sct_neopixel.c
     )
+
   target_include_directories(${TARGET} PUBLIC
     # family, hw, board
     ${CMAKE_CURRENT_FUNCTION_LIST_DIR}
diff --git a/hw/bsp/nrf/family.c b/hw/bsp/nrf/family.c
index 157b2bf21..6a559ada6 100644
--- a/hw/bsp/nrf/family.c
+++ b/hw/bsp/nrf/family.c
@@ -27,6 +27,15 @@
 #include "bsp/board.h"
 #include "board.h"
 
+// Suppress warning caused by mcu driver
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#pragma GCC diagnostic ignored "-Wcast-align"
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#pragma GCC diagnostic ignored "-Wundef"
+#endif
+
 #include "nrfx.h"
 #include "hal/nrf_gpio.h"
 #include "drivers/include/nrfx_power.h"
@@ -37,6 +46,11 @@
 #include "nrf_soc.h"
 #endif
 
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
+
 //--------------------------------------------------------------------+
 // Forward USB interrupt events to TinyUSB IRQ Handler
 //--------------------------------------------------------------------+
diff --git a/hw/bsp/stm32g4/family.mk b/hw/bsp/stm32g4/family.mk
index 5ed84422d..a4b644245 100644
--- a/hw/bsp/stm32g4/family.mk
+++ b/hw/bsp/stm32g4/family.mk
@@ -36,6 +36,7 @@ IAR_ASFLAGS += --cpu cortex-m4 --fpu VFPv4
 
 SRC_C += \
 	src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \
+	src/portable/st/typec/typec_stm32.c \
 	$(ST_CMSIS)/Source/Templates/system_stm32$(ST_FAMILY)xx.c \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal.c \
 	$(ST_HAL_DRIVER)/Src/stm32$(ST_FAMILY)xx_hal_cortex.c \
diff --git a/src/portable/st/typec/typec_stm32.c b/src/portable/st/typec/typec_stm32.c
index 231da5450..bf8b660f0 100644
--- a/src/portable/st/typec/typec_stm32.c
+++ b/src/portable/st/typec/typec_stm32.c
@@ -183,9 +183,9 @@ bool tcd_init(uint8_t rhport, uint32_t port_type) {
 
     // Read Voltage State on CC1 & CC2 fore initial state
     uint32_t v_cc[2];
+    (void) v_cc;
     v_cc[0] = (UCPD1->SR >> UCPD_SR_TYPEC_VSTATE_CC1_Pos) & 0x03;
     v_cc[1] = (UCPD1->SR >> UCPD_SR_TYPEC_VSTATE_CC2_Pos) & 0x03;
-
     TU_LOG1("Initial VState CC1 = %lu, CC2 = %lu\r\n", v_cc[0], v_cc[1]);
 
     // Enable CC1 & CC2 Interrupt
@@ -308,8 +308,11 @@ void tcd_int_handler(uint8_t rhport) {
 
     if (!(sr & UCPD_SR_RXERR)) {
       // response with good crc
-      _good_crc.msg_id = ((pd_header_t const*) _rx_buf)->msg_id;
-      dma_tx_start(rhport, &_good_crc, 2);
+      // TODO move this to usbc stack
+      if (_rx_buf) {
+        _good_crc.msg_id = ((pd_header_t const *) _rx_buf)->msg_id;
+        dma_tx_start(rhport, &_good_crc, 2);
+      }
 
       result = XFER_RESULT_SUCCESS;
     }else {
diff --git a/tools/cmake/toolchain/arm_gcc.cmake b/tools/cmake/toolchain/arm_gcc.cmake
index 6dd1e7002..cefa9d2ce 100644
--- a/tools/cmake/toolchain/arm_gcc.cmake
+++ b/tools/cmake/toolchain/arm_gcc.cmake
@@ -35,32 +35,6 @@ set(TOOLCHAIN_EXE_LINKER_FLAGS
   -Wl,--cref
   )
 
-set(TOOLCHAIN_WARNING_FLAGS
-  -Wall
-  -Wextra
-  -Werror
-  -Wfatal-errors
-  -Wdouble-promotion
-  -Wstrict-prototypes
-  -Wstrict-overflow
-  -Werror-implicit-function-declaration
-  -Wfloat-equal
-  -Wundef
-  -Wshadow
-  -Wwrite-strings
-  -Wsign-compare
-  -Wmissing-format-attribute
-  -Wunreachable-code
-  -Wcast-align
-  -Wcast-function-type
-  -Wcast-qual
-  -Wnull-dereference
-  -Wuninitialized
-  -Wunused
-  -Wreturn-type
-  -Wredundant-decls
-  )
-
 include(${CMAKE_CURRENT_LIST_DIR}/set_flags.cmake)
 
 # try_compile is cmake test compiling its own example,
diff --git a/tools/cmake/toolchain/arm_iar.cmake b/tools/cmake/toolchain/arm_iar.cmake
index dfbe55e0d..a487e5b9f 100644
--- a/tools/cmake/toolchain/arm_iar.cmake
+++ b/tools/cmake/toolchain/arm_iar.cmake
@@ -28,7 +28,4 @@ list(APPEND TOOLCHAIN_COMMON_FLAGS
 list(APPEND TOOLCHAIN_EXE_LINKER_FLAGS
   )
 
-list(APPEND TOOLCHAIN_WARNING_FLAGS
-  )
-
 include(${CMAKE_CURRENT_LIST_DIR}/set_flags.cmake)