/**
@defgroup    boards_stm32f3discovery STM32F3Discovery
@ingroup     boards
@brief       Support for the STM32F3Discovery board

## Overview

The STM32F3-discovery is cheap evaluation board designed by ST for pushing
the STM32F3 microcontoller to a broad audience. It features an STM32F303VC
microcontroller with 48Kb of RAM and 256Kb flash memory running with up to
72MHz. Addionially it provides USB host capabilities, 8 LEDs and sensors for a
9-degree of freedom initial measurement unit (3-axis accelerometer, 3-axis gyro
and 3-axis magnetometer).

The board does however not provide any radio capabilities, radio devices have
to be connected externally via I2C, SPI, UART or similar.

See [this page](https://github.com/RIOT-OS/RIOT/wiki/Getting-started-with-STM32F%5B0%7C3%7C4%5Ddiscovery-boards)
for a quick getting started guide.

## Hardware

![STM32F3discovery image](https://www.st.com/bin/ecommerce/api/image.PF254044.en.feature-description-include-personalized-no-cpn-large.jpg)


### MCU
| MCU        | STM32F303VC       |
|:------------- |:--------------------- |
| Family | ARM Cortex-M4     |
| Vendor | ST Microelectronics   |
| RAM        | 48Kb (40Kb RAM + 8Kb CCM RAM) |
| Flash      | 256Kb             |
| Frequency  | up to 72MHz (using the on-board 8MHz Oszillator of the ST-Link) |
| FPU        | yes               |
| Timers | 10 (9x 16-bit, 1x 32-bit [TIM2])  |
| ADCs       | 4x 12-bit         |
| UARTs      | 5                 |
| SPIs       | 3                 |
| I2Cs       | 2                 |
| Vcc        | 2.0V - 3.6V           |
| Datasheet  | [Datasheet](https://www.st.com/resource/en/datasheet/stm32f303vc.pdf) |
| Reference Manual | [Reference Manual](https://www.st.com/resource/en/reference_manual/dm00043574.pdf) |
| Programming Manual | [Programming Manual](https://www.st.com/resource/en/programming_manual/dm00046982.pdf) |
| Board Manual   | [Board Manual](https://www.st.com/resource/en/user_manual/dm00063382.pdf)|

### RIOT static pin mapping

please refer to [this](https://docs.google.com/spreadsheets/d/1gnxsux5WpFrn-33Ivb9nGgTBqooqgDYxRkhZms-cvsc/edit?usp=sharing)
*  document for the pin mapping as
implemenented in `boards/stm32f3discovery/include/periph_conf.h`

### User Interface

2 Buttons:

| NAME   | USER  | RESET     |
|:----- |:----- |:--------- |
| Pin    | PA0 (IN) | NRST   |

8 LEDs:

| NAME   | LD3   | LD4   | LD5   | LD6   | LD7   | LD8   | LD9   | LD10  |
| -----  | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- |
| Color  | red   | blue  | orange| green | green | orange| blue  | red   |
| Pin    | PE9   | PE8   | PE10  | PE15  | PE11  | PE14  | PE12  | PE13  |



### E-Compass / Accelerometer

The board has an on-board MEMS-chip that is an integrated accelerometer and
e-compass.

| Sensor | LSM303DLHC        |
|:------------- |:--------------------- |
| Type       | Accelerometer and magnetometer |
| Vendor | ST Microelectronics   |
| Datasheet  | [Datasheet](https://www.st.com/resource/en/datasheet/lsm303dlhc.pdf)|
| Connected to   | I2C_0         |
| Pin Config:    | |
| Device | I2C1          |
| SCL        | PB6 (OUT, I2C1_SCL)   |
| SDA        | PB7 (OUT, I2C1_SDA)   |
| DRDY       | PE2 (IN)      |
| INT1       | PE4 (IN)      |
| INT2       | PE5 (IN)      |



### Gyroscope

An 3-axis gyroscope is soldered on the board.

| Sensor | L3GD20/I3G4250D [1] |
|:------------- |:--------------------- |
| Type       | Gyroscope     |
| Vendor | ST Microelectronics   |
| Datasheet L3GD20 | [Datasheet](https://www.mouser.de/datasheet/2/389/l3gd20-954745.pdf) |
| Datasheet I3G4250D | [Datasheet](https://www.st.com/resource/en/datasheet/i3g4250d.pdf) |
| Connected to   | SPI_0         |
| Pin Config:    | |
| Device | SPI1          |
| SCK        | PA5 (OUT, SPI1_SCK)   |
| MISO       | PA6 (IN,  SPI1_MISO)  |
| MOSI       | PA7 (OUT, SPI1_MOSI)  |
| CS     | PE3 (OUT)     |
| INT1       | PE0 (IN)      |
| INT2/DRDY  | PE1 (IN)      |

[1] L3GD20 (up to rev. D01), IG34250D (from rev. E02)
The driver detects automatically which sensor variant is on the board.

## Implementation Status

| Device | ID        | Supported | Comments  |
|:------------- |:------------- |:------------- |:------------- |
| MCU        | STM23F303VC   | partly    | Energy saving modes not fully utilized |
| Low-level driver | GPIO    | yes       | |
|        | PWM       | yes       | |
|        | UART      | full      | |
|        | I2C       | no        | in progress   |
|        | SPI       | no        | in progress   |
|        | USB       | no        | |
|        | Timer     | full      | |
|        | Inpute Capture| no        | |
| Accelerometer  | LSM303DLHC    | no        | planned |
| Magnetometer   | LSM303DLHC    | no        | planned |
| Gyroscope  | L3GD20/I3G4250D | yes        | |


## Flashing the device


The STM32F3discovery board includes an on-board ST-LINK V2 programmer. The
easiest way to program the board is to use OpenOCD. Once you have installed
OpenOCD (look [here](https://github.com/RIOT-OS/RIOT/wiki/OpenOCD) for
installation instructions), you can flash the board simply by typing

```
make flash
```
and debug via GDB by simply typing
```
make debug
```


## Supported Toolchains

For using the STM32F3discovery board we strongly recommend the usage of the
[GNU Tools for ARM Embedded Processors](https://launchpad.net/gcc-arm-embedded)
toolchain.


## Using UART

1. connect your usb tty to: RX=PA10 TX=PA9 and GND=GND
   - **PA10** is connected with **TX** on the UART converter
   - **PA9** is connected with **RX** on the UART converter
2. done
 */