/**
@defgroup    boards_nucleo-f334r8 STM32 Nucleo-F334R8
@ingroup     boards_common_nucleo64
@brief       Support for the STM32 Nucleo-F334R8

## Overview

The Nucleo-F334R8 is a board from ST's Nucleo family supporting a ARM Cortex-M4
STM32F334R8 microcontroller with 12KiB of RAM and 64KiB or Flash.

## Hardware

![Nucleo64 F334R8](http://www.open-electronics.org/wp-content/uploads/2015/08/Figura2-500x467.png)
![nucleo-f334 pinout](https://raw.githubusercontent.com/wiki/RIOT-OS/RIOT/images/nucleo-f334_pinout.png)

## Pinout

@image html pinouts/nucleo-f334r8.svg "Pinout for the nucleo-F334R8 (from user manual UM1724, http://www.st.com/resource/en/user_manual/dm00105823.pdf, page 31)" width=50%

### MCU
| MCU        | STM32F334R8       |
|:---------- |:----------------- |
| Family     | ARM Cortex-M4     |
| Vendor     | ST Microelectronics |
| RAM        | 12KiB             |
| Flash      | 64KiB             |
| Frequency  | up to 72MHz       |
| FPU        | yes               |
| Timers     | 12 (8x 16-bit, 1x 32-bit [TIM2], 1x Systick, 2x watchdog) |
| ADCs       | 2x 12-bit (21 channels) |
| UARTs      | 3                 |
| SPIs       | 1                 |
| I2Cs       | 1                 |
| RTC        | 1                 |
| CAN        | 1                 |
| Vcc        | 2.0V - 3.6V       |
| Datasheet  | [Datasheet](https://www.st.com/resource/en/datasheet/stm32f334r8.pdf) |
| Reference Manual | [Reference Manual](https://www.st.com/resource/en/reference_manual/dm00093941.pdf) |
| Programming Manual | [Programming Manual](https://www.st.com/resource/en/programming_manual/dm00046982.pdf) |
| Board Manual | [Board Manual](http://www.st.com/st-web-ui/static/active/en/resource/technical/document/user_manual/DM00105823.pdf)|



## Implementation Status
| Device | ID        | Supported | Comments  |
|:------------- |:------------- |:------------- |:------------- |
| MCU        | STM32F334R8   | partly    | Energy saving modes not fully utilized |
| Low-level driver | GPIO    | yes       | |
|        | PWM       | no        | |
|        | UART      | one UART      | |
|        | I2C       | no        | |
|        | SPI       | one SPI       | |
|        | USB       | no        | |
|        | Timer     | one 32 timer      | |


## Flashing the device

### Flashing the Board Using OpenOCD

The ST Nucleo-F334R8 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

```
BOARD=nucleo-f334r8 make flash
```
and debug via GDB by simply typing
```
BOARD=nucleo-f334r8 make debug
```

### Flashing the Board Using ST-LINK Removable Media

On-board ST-LINK programmer provides via composite USB device removable media.
Copying the HEX file causes reprogramming of the board. This task
could be performed manually; however, the cpy2remed (copy to removable
media) PROGRAMMER script does this automatically. To program board in
this manner, use the command:
```
make BOARD=nucleo-f334r8 PROGRAMMER=cpy2remed flash
```
@note This PROGRAMMER requires ST-LINK firmware 2.37.26 or newer. Firmware updates
could be found on [this STM webpage](https://www.st.com/en/development-tools/stsw-link007.html).

## Accessing RIOT shell

Default RIOT shell access utilize VCP (Virtual COM Port) via USB interface,
provided by integrated ST-LINK programmer. ST-LINK is connected to the
microcontroller USART2.

The default baud rate is 115200.

## Supported Toolchains
For using the ST Nucleo-F334R8 board we strongly recommend the usage of the
[GNU Tools for ARM Embedded Processors](https://launchpad.net/gcc-arm-embedded)
toolchain.
 */