diff --git a/docs/boards.md b/docs/boards.md
index d3dcec375..271ca2844 100644
--- a/docs/boards.md
+++ b/docs/boards.md
@@ -87,6 +87,7 @@ This code base already had supported for a handful of following boards (sorted a
 - [Micro Python PyBoard v1.1](https://store.micropython.org/product/PYBv1.1)
 - [STLink-V3 Mini](https://www.st.com/en/development-tools/stlink-v3mini.html)
 - [STM32 L035c8 Discovery](https://www.st.com/en/evaluation-tools/32l0538discovery.html)
+- [STM32 L4R5zi Nucleo](https://www.st.com/en/evaluation-tools/nucleo-l4r5zi.html)
 - [STM32 F070rb Nucleo](https://www.st.com/en/evaluation-tools/nucleo-f070rb.html)
 - [STM32 F072rb Discovery](https://www.st.com/en/evaluation-tools/32f072bdiscovery.html)
 - STM32 F103c Blue Pill
@@ -104,6 +105,7 @@ This code base already had supported for a handful of following boards (sorted a
 - [STM32 F769i Discovery](https://www.st.com/en/evaluation-tools/32f769idiscovery.html)
 - [STM32 H743zi Nucleo](https://www.st.com/en/evaluation-tools/nucleo-h743zi.html)
 - [STM32 H743i Evaluation](https://www.st.com/en/evaluation-tools/stm32h743i-eval.html)
+- [STM32 H745i Discovery](https://www.st.com/en/evaluation-tools/stm32h745i-disco.html)
 
 ### TI
 
diff --git a/examples/readme.md b/examples/readme.md
index 790427cd2..f6cd380b6 100644
--- a/examples/readme.md
+++ b/examples/readme.md
@@ -32,28 +32,39 @@ Then compile with `make BOARD=[your_board] all`, for example
 $ make BOARD=feather_nrf52840_express all
 ```
 
+**Port Selection**
 
-To compile for debugging with debug symbols add DEBUG=1, for example
-
-```
-$ make BOARD=feather_nrf52840_express DEBUG=1 all
-If a board has several ports, one port is choosen by default in the individual board.mk file. Choose another port with PORT=x. For example to select the HS port of a STM32F746Disco board, use:
+If a board has several ports, one port is chosen by default in the individual board.mk file. Use option `PORT=x` To choose another port. For example to select the HS port of a STM32F746Disco board, use:
 
 ```
 $ make BOARD=stm32f746disco PORT=1 all
 ```
 
-### Debug Log
+**Port Speed**
 
-### Log Level
+A MCU can support multiple operational speed. By default, the example build system will use the fastest supported on the board. Use option `SPEED=full/high` e.g To force F723 operate at full instead of default high speed
+
+```
+$ make BOARD=stm32f746disco SPEED=full all
+```
+
+### Debug
+
+To compile for debugging with debug symbols add `DEBUG=1`, for example
+
+```
+$ make BOARD=feather_nrf52840_express DEBUG=1 all
+```
+
+#### Log
 
 Should you have an issue running example and/or submitting an bug report. You could enable TinyUSB built-in debug logging with optional `LOG=`. LOG=1 will only print out error message, LOG=2 print more information with on-going events. LOG=3 or higher is not used yet. 
 
 ```
-$ make LOG=2 BOARD=feather_nrf52840_express all
+$ make BOARD=feather_nrf52840_express LOG=2 all
 ```
 
-### Logger
+#### Logger
 
 By default log message is printed via on-board UART which is slow and take lots of CPU time comparing to USB speed. If your board support on-board/external debugger, it would be more efficient to use it for logging. There are 2 protocols: 
 
@@ -67,8 +78,8 @@ By default log message is printed via on-board UART which is slow and take lots
   - Software viewer should be provided along with your debugger driver.
 
 ```
-$ make LOG=2 LOGGER=rtt BOARD=feather_nrf52840_express all
-$ make LOG=2 LOGGER=swo BOARD=feather_nrf52840_express all
+$ make BOARD=feather_nrf52840_express LOG=2 LOGGER=rtt all
+$ make BOARD=feather_nrf52840_express LOG=2 LOGGER=swo all
 ```
 
 ## Flash
diff --git a/hw/bsp/stlinkv3mini/board.mk b/hw/bsp/stlinkv3mini/board.mk
index b77fb5a51..4ca6cfd68 100644
--- a/hw/bsp/stlinkv3mini/board.mk
+++ b/hw/bsp/stlinkv3mini/board.mk
@@ -1,6 +1,6 @@
 # Only OTG-HS has a connector on this board
 
-REDUCE_SPEED ?= 0
+SPEED ?= high
 
 CFLAGS += \
   -flto \
@@ -14,12 +14,13 @@ CFLAGS += \
   -DHSE_VALUE=25000000 \
   -DCFG_TUSB_MCU=OPT_MCU_STM32F7 \
   -DBOARD_DEVICE_RHPORT_NUM=1
-ifeq ($(REDUCE_SPEED), 0)
-CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
-$(info "Using OTG_HS in HS mode")
+
+ifeq ($(SPEED), high)
+  CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
+  $(info "Using OTG_HS in HighSpeed mode")
 else
-CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
-$(info "Using OTG_HS in FS mode")
+  CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
+  $(info "Using OTG_HS in FullSpeed mode")
 endif
 
 # mcu driver cause following warnings
diff --git a/hw/bsp/stm32f723disco/board.mk b/hw/bsp/stm32f723disco/board.mk
index 47148ec4d..9ec23bfde 100644
--- a/hw/bsp/stm32f723disco/board.mk
+++ b/hw/bsp/stm32f723disco/board.mk
@@ -1,5 +1,5 @@
 PORT ?= 1
-REDUCE_SPEED ?= 0
+SPEED ?= high
 
 CFLAGS += \
   -flto \
@@ -15,15 +15,15 @@ CFLAGS += \
   -DBOARD_DEVICE_RHPORT_NUM=$(PORT)
 
 ifeq ($(PORT), 1)
- ifeq ($(REDUCE_SPEED), 0)
-CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
-$(info "Using OTG_HS in HS mode")
- else
-CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
-$(info "Using OTG_HS in FS mode")
- endif
+  ifeq ($(SPEED), high)
+    CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
+    $(info "Using OTG_HS in HighSpeed mode")
+  else
+    CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
+    $(info "Using OTG_HS in FullSpeed mode")
+  endif
 else
-$(info "Using OTG_FS")
+  $(info "Using OTG_FS")
 endif
 
 # mcu driver cause following warnings
diff --git a/hw/bsp/stm32f746disco/board.mk b/hw/bsp/stm32f746disco/board.mk
index d7329a28f..48cb3f141 100644
--- a/hw/bsp/stm32f746disco/board.mk
+++ b/hw/bsp/stm32f746disco/board.mk
@@ -1,5 +1,5 @@
 PORT ?= 0
-REDUCE_SPEED ?= 0
+SPEED ?= high
 
 CFLAGS += \
   -flto \
@@ -15,15 +15,15 @@ CFLAGS += \
   -DBOARD_DEVICE_RHPORT_NUM=$(PORT)
 
 ifeq ($(PORT), 1)
- ifeq ($(REDUCE_SPEED), 0)
-CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
-$(info "Using OTG_HS in HS mode")
- else
-CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
-$(info "Using OTG_HS in FS mode")
- endif
+  ifeq ($(SPEED), high)
+    CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
+    $(info "Using OTG_HS in HighSpeed mode")
+  else
+    CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
+    $(info "Using OTG_HS in FullSpeed mode")
+  endif
 else
-$(info "Using OTG_FS")
+  $(info "Using OTG_FS")
 endif
 
 # mcu driver cause following warnings
diff --git a/hw/bsp/stm32f769disco/board.mk b/hw/bsp/stm32f769disco/board.mk
index 43b677ddd..962dddc68 100644
--- a/hw/bsp/stm32f769disco/board.mk
+++ b/hw/bsp/stm32f769disco/board.mk
@@ -1,4 +1,6 @@
-REDUCE_SPEED ?= 0
+# Only OTG-HS has a connector on this board
+
+SPEED ?= high
 
 CFLAGS += \
   -flto \
@@ -13,12 +15,12 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_STM32F7 \
   -DBOARD_DEVICE_RHPORT_NUM=1 \
 
-ifeq ($(REDUCE_SPEED), 0)
-CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
-$(info "Using OTG_HS in HS mode")
+ifeq ($(SPEED), high)
+  CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_HIGH_SPEED
+  $(info "Using OTG_HS in HighSpeed mode")
 else
-CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
-$(info "Using OTG_HS in FS mode")
+  CFLAGS += -DBOARD_DEVICE_RHPORT_SPEED=OPT_MODE_FULL_SPEED
+  $(info "Using OTG_HS in FullSpeed mode")
 endif
 
 # suppress warning caused by vendor mcu driver
diff --git a/src/portable/st/synopsys/dcd_synopsys.c b/src/portable/st/synopsys/dcd_synopsys.c
index 35b7f44f9..7eb63e52f 100644
--- a/src/portable/st/synopsys/dcd_synopsys.c
+++ b/src/portable/st/synopsys/dcd_synopsys.c
@@ -403,7 +403,7 @@ void dcd_init (uint8_t rhport)
     // Select default internal VBUS Indicator and Drive for ULPI
     usb_otg->GUSBCFG &= ~(USB_OTG_GUSBCFG_ULPIEVBUSD | USB_OTG_GUSBCFG_ULPIEVBUSI);
 
-    #if defined(USB_HS_PHYC)
+#if defined(USB_HS_PHYC)
     // Highspeed with embedded UTMI PHYC
 
     // Select UTMI Interface