.. _stm32f4_disco_board:

ST STM32F4DISCOVERY
###################

Overview
********

The STM32F4DISCOVERY Discovery kit features an ARM Cortex-M4 based STM32F407VG MCU
with a wide range of connectivity support and configurations Here are
some highlights of the STM32F4DISCOVERY board:


- STM32 microcontroller in LQFP100 package
- Extension header for all LQFP100 I/Os for quick connection to prototyping board and easy probing
- On-board ST-LINK/V2 debugger/programmer with SWD connector
- Flexible board power supply:

       - USB VBUS or external source(3.3V, 5V, 7 - 12V)
       - Power management access point

- Eight LEDs:

       - USB communication (LD1)
       - 3.3 V power on (LD2)
       - Four user LEDs: orange (LD3), green (LD4), red (LD5), and blue (LD6)
       - 2 USB OTG LEDs for VBUS (LD7) and over-current (LD8)

- Two push-buttons: USER and RESET
- USB OTG FS with micro-AB connector
- LIS302DL or LIS3DSH ST MEMS 3-axis accelerometer
- MP45DT02 ST-MEMS audio sensor omni-directional digital microphone
- CS43L22 audio DAC with integrated class D speaker driver

.. image:: img/en.stm32f4_discovery.jpg
     :width: 350px
     :align: center
     :height: 550px
     :alt: STM32F4DISCOVERY

More information about the board can be found at the `STM32F4DISCOVERY website`_.

Hardware
********

STM32F4DISCOVERY Discovery kit provides the following hardware components:

- STM32F407VGT6 in LQFP100 package
- ARM®32-bit Cortex®-M4 CPU with FPU
- 168 MHz max CPU frequency
- VDD from 1.8 V to 3.6 V
- 1 MB Flash
- 192+4 KB SRAM including 64-Kbyte of core coupled memory
- GPIO with external interrupt capability
- 3x12-bit ADC with 24 channels
- 2x12-bit D/A converters
- RTC
- Advanced-control Timer
- General Purpose Timers (17)
- Watchdog Timers (2)
- USART/UART (6)
- I2C (3)
- SPI (3)
- SDIO
- 2xCAN
- USB 2.0 OTG FS with on-chip PHY
- USB 2.0 OTG HS/FS with dedicated DMA, on-chip full-speed PHY and ULPI
- 10/100 Ethernet MAC with dedicated DMA
- 8- to 14-bit parallel camera
- CRC calculation unit
- True random number generator
- DMA Controller

More information about STM32F407VG can be found here:
       - `STM32F407VG on www.st.com`_
       - `STM32F407 reference manual`_

Supported Features
==================

The Zephyr stm32f4_disco board configuration supports the following hardware features:

+-----------+------------+-------------------------------------+
| Interface | Controller | Driver/Component                    |
+===========+============+=====================================+
| NVIC      | on-chip    | nested vector interrupt controller  |
+-----------+------------+-------------------------------------+
| UART      | on-chip    | serial port-polling;                |
|           |            | serial port-interrupt               |
+-----------+------------+-------------------------------------+
| PINMUX    | on-chip    | pinmux                              |
+-----------+------------+-------------------------------------+
| GPIO      | on-chip    | gpio                                |
+-----------+------------+-------------------------------------+
| PWM       | on-chip    | pwm                                 |
+-----------+------------+-------------------------------------+

Other hardware features are not yet supported on Zephyr porting.

The default configuration can be found in the defconfig file:

	``boards/arm/stm32f4_disco/stm32f4_disco_defconfig``


Pin Mapping
===========

STM32F4DISCOVERY Discovry kit has 8 GPIO controllers. These controllers are responsible for pin muxing,
input/output, pull-up, etc.

For mode details please refer to `STM32F4DISCOVERY board User Manual`_.

Default Zephyr Peripheral Mapping:
----------------------------------
- UART_1_TX : PB6
- UART_1_RX : PB7
- UART_2_TX : PA2
- UART_2_RX : PA3
- USER_PB : PA0
- LD3 : PD13
- LD4 : PD12
- LD5 : PD14
- LD6 : PD15

System Clock
============

STM32F4DISCOVERY System Clock could be driven by internal or external oscillator,
as well as main PLL clock. By default System clock is driven by PLL clock at 168MHz,
driven by 8MHz high speed external clock.

Serial Port
===========

STM32F4DISCOVERY Discovery kit has up to 6 UARTs. The Zephyr console output is assigned to UART2.
Default settings are 115200 8N1.


Programming and Debugging
*************************

Flashing
========

STM32F4DISCOVERY Discovery kit includes an ST-LINK/V2 embedded debug tool interface.
This interface is supported by the openocd version included in Zephyr SDK.

Flashing an application to STM32F4DISCOVERY
-------------------------------------------

The sample application :ref:`hello_world` is being used in this tutorial:

.. code-block:: console

   $<zephyr_root_path>/samples/hello_world

To build the Zephyr kernel and application, enter:

.. code-block:: console

   $ cd <zephyr_root_path>
   $ source zephyr-env.sh
   $ cd $ZEPHYR_BASE/samples/hello_world/
   $ make BOARD=stm32f4_disco

Connect the STM32F4DISCOVERY Discovery kit to your host computer using the USB port.
Then, enter the following command:

.. code-block:: console

   $ make BOARD=stm32f4_disco flash

Run a serial host program to connect with your board:

.. code-block:: console

   $ minicom -D /dev/ttyACM0

You should see the following message:

.. code-block:: console

   Hello World! arm


Debugging
=========

Access gdb with the following make command:

.. code-block:: console

   $ make BOARD=stm32f4_disco debug


.. _STM32F4DISCOVERY website:
   http://www.st.com/en/evaluation-tools/stm32f4discovery.html

.. _STM32F4DISCOVERY board User Manual:
   http://www.st.com/resource/en/user_manual/dm00039084.pdf

.. _STM32F407VG on www.st.com:
   http://www.st.com/en/microcontrollers/stm32f407vg.html

.. _STM32F407 reference manual:
   http://www.st.com/resource/en/reference_manual/dm00031020.pdf