.. _stm32f723e_disco_board:

ST STM32F723E Discovery
#######################

Overview
********

The discovery kit enables a wide diversity of applications taking benefit
from audio, multi-sensor support, graphics, security, security, video,
and high-speed connectivity features. Important board features include:

- STM32F723IEK6 microcontroller featuring 512 Kbytes of Flash memory and 256+16+4 Kbytes of RAM, in BGA176 package
- On-board ST-LINK/V2-1 supporting USB re-enumeration capability
- TFT LCD 240x240 pixels with touch panel
- SAI audio codec
- Audio line in and line out jack
- Stereo speaker outputs
- Four ST MEMS microphones
- Two pushbuttons (user and reset)
- 512-Mbit Quad-SPI Flash memory
- 8-Mbit external PSRAM
- USB OTG HS with Micro-AB connectors
- USB OTG FS with Micro-AB connectors

.. image:: img/stm32f723e_disco.jpg
     :align: center
     :alt: STM32F723E-DISCO

More information about the board can be found at the `32F723E-DISCO website`_.

Hardware
********

The STM32F723E Discovery kit provides the following hardware components:

- STM32F723IEK6 in BGA176 package
- ARM |reg| 32-bit Cortex |reg| -M7 CPU with FPU
- 216 MHz max CPU frequency
- VDD from 1.8 V to 3.6 V
- 1 MB Flash
- 256+16+4 KB SRAM including 64KB of tightly coupled memory
- GPIO with external interrupt capability
- 3x12-bit ADC with 24 channels
- 2x12-bit D/A converters
- RTC
- Advanced-control Timer (2)
- General Purpose Timers (13)
- Watchdog Timers (2)
- USART/UART (8)
- I2C (3)
- SPI (5)
- 2xSAI (serial audio interface)
- SDIO (2)
- CAN
- USB 2.0 OTG FS with on-chip PHY
- USB 2.0 OTG HS/FS with dedicated DMA, on-chip full-speed PHY and on-chip hi-speed PHY
- CRC calculation unit
- True random number generator
- DMA Controller

More information about STM32F723IEK6 can be found here:

- `STM32F723IEK6 on www.st.com`_
- `STM32F72xxx reference manual`_

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

The Zephyr stm32f723e_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                                |
+-----------+------------+-------------------------------------+
| I2C       | on-chip    | i2c                                 |
+-----------+------------+-------------------------------------+
| SPI       | on-chip    | spi                                 |
+-----------+------------+-------------------------------------+
| USB       | on-chip    | USB device                          |
+-----------+------------+-------------------------------------+

Other hardware features are not yet supported on Zephyr porting.

The default configuration can be found in the defconfig file:
``boards/arm/stm32f723e_disco/stm32f723e_disco_defconfig``

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

STM32F723E Discovery kit has 7 GPIO controllers. These controllers are responsible for pin muxing,
input/output, pull-up, etc.

For mode details please refer to `32F723E-DISCO board User Manual`_.

Default Zephyr Peripheral Mapping:
----------------------------------
- UART_2 TX/RX : PA2/PA3 (Arduino Serial)
- UART_6 TX/RX : PC6/PC7 (ST-Link Virtual Port Com)
- I2C1 SCL/SDA : PB8/PB9
- I2C2 SCL/SDA : PH4/PH5 (Arduino I2C)
- I2C3 SCL/SDA : PA8/PH8
- SPI1 SCK/MISO/MOSI : PA5/PB4/PB5 (Arduino SPI)
- LD1 : PA5
- LD5 : PA7
- LD6 : PB1
- OTG_FS_DM : PA11
- OTG_FS_DP : PA12

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

The STM32F723E System Clock can be driven by an internal or external oscillator,
as well as by the main PLL clock. By default, the System clock is driven by the PLL
clock at 216MHz, driven by a 25MHz high speed external clock.

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

The STM32F723E Discovery kit has up to 8 UARTs. The Zephyr console output is assigned to UART6
which connected to the onboard ST-LINK/V2 Virtual COM port interface. Default communication
settings are 115200 8N1.

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

Applications for the ``stm32f723e_disco`` board configuration can be built and
flashed in the usual way (see :ref:`build_an_application` and
:ref:`application_run` for more details).

Flashing
========

STM32F723E Discovery kit includes an ST-LINK/V2 embedded debug tool interface.
This interface is supported by the openocd version included in the Zephyr SDK.

Flashing an application to STM32F723E-DISCO
-------------------------------------------

First, connect the STM32F723E Discovery kit to your host computer using
the USB port to prepare it for flashing. Then build and flash your application.

Here is an example for the :ref:`hello_world` application.

.. zephyr-app-commands::
   :zephyr-app: samples/hello_world
   :board: stm32f723e_disco
   :goals: build flash

Run a serial host program to connect with your board:

.. code-block:: console

   $ minicom -D /dev/ttyACM0

You should see the following message on the console:

.. code-block:: console

   Hello World! arm

Debugging
=========

You can debug an application in the usual way.  Here is an example for the
:ref:`hello_world` application.

.. zephyr-app-commands::
   :zephyr-app: samples/hello_world
   :board: stm32f723e_disco
   :goals: debug


.. _32F723E-DISCO website:
   http://www.st.com/en/evaluation-tools/32f723ediscovery.html

.. _32F723E-DISCO board User Manual:
   http://www.st.com/resource/en/user_manual/dm00342318.pdf

.. _STM32F723IEK6 on www.st.com:
   http://www.st.com/en/microcontrollers/stm32f723ie.html

.. _STM32F72xxx reference manual:
   http://www.st.com/resource/en/reference_manual/dm00305990.pdf