update makefile to support iar build starting with stm32f070

hw/bsp/stm32f0/boards/stm32f070rbnucleo/board.mk

@@ -1,11 +1,13 @@
 CFLAGS += -DSTM32F070xB -DCFG_EXAMPLE_VIDEO_READONLY
 
+SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f070xb.s
 LD_FILE = $(BOARD_PATH)/stm32F070rbtx_flash.ld
 
-SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32f070xb.s
+IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32f070xb.s
+IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32f070xb_flash.icf
 
 # For flash-jlink target
 JLINK_DEVICE = stm32f070rb
 
 # flash target using on-board stlink
-flash: flash-stlink
+flash: flash-stlink

hw/bsp/stm32f0/family.c

@@ -153,7 +153,7 @@ uint32_t board_millis(void)
 
 void HardFault_Handler (void)
 {
-  asm("bkpt");
+   __asm("BKPT #0\n");
 }
 
 #ifdef  USE_FULL_ASSERT

hw/bsp/stm32f0/family.mk

@@ -8,17 +8,28 @@ ST_HAL_DRIVER = hw/mcu/st/stm32$(ST_FAMILY)xx_hal_driver
 include $(TOP)/$(BOARD_PATH)/board.mk
 
 CFLAGS += \
+  -DCFG_EXAMPLE_MSC_READONLY \
+  -DCFG_TUSB_MCU=OPT_MCU_STM32F0
+
+# --------------
+# GCC Flags
+# --------------
+GCC_CFLAGS += \
   -flto \
   -mthumb \
   -mabi=aapcs \
   -mcpu=cortex-m0 \
   -mfloat-abi=soft \
   -nostdlib -nostartfiles \
-  -DCFG_EXAMPLE_MSC_READONLY \
-  -DCFG_TUSB_MCU=OPT_MCU_STM32F0
 
 # suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=unused-parameter -Wno-error=cast-align -Wno-error=cast-qual
+GCC_CFLAGS += -Wno-error=unused-parameter -Wno-error=cast-align -Wno-error=cast-qual
+
+# --------------
+# IAR Flags
+# --------------
+IAR_CFLAGS += --cpu cortex-m0
+IAR_ASFLAGS += --cpu cortex-m0
 
 SRC_C += \
   src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c \