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boards/nucleo-wl55jc: Documentation

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/**
@defgroup boards_nucleo-wl55jc STM32 Nucleo-WL55JC
@ingroup boards_common_nucleo64
@brief Support for the STM32 Nucleo-W55JCg
### MCU
| MCU | STM32WL55JC |
|:---------- |:--------------------------------------------------------- |
| Family | ARM Cortex-M4 / ARM Cortex-M0+ Dual core |
| Vendor | ST Microelectronics |
| RAM | 64KiB |
| Flash | 256KiB |
| Frequency | up to 48MHz |
| FPU | no |
| Timers | 10 (2x watchdog, 1 SysTick, 6x 16-bit, 1x 32-bit [TIM2]) |
| ADCs | 1x 12-bit (12 channel ) |
| UARTs | 3 (two UARTs and one Low-Power UART) |
| SPIs | 2 |
| I2Cs | 3 |
| RTC | 1 |
| Vcc | 1.8 V - 3.6V |
| Datasheet | [Datasheet](https://www.st.com/resource/en/datasheet/stm32wl55jc.pdf) |
| Reference Manual | [Reference Manual](https://www.st.com/resource/en/reference_manual/dm00451556-stm32wl5x-advanced-armbased-32bit-mcus-with-subghz-radio-solution-stmicroelectronics.pdf) |
| Programming Manual 1 | [Reference Manual - M4 ](https://www.st.com/resource/en/programming_manual/dm00046982-stm32-cortexm4-mcus-and-mpus-programming-manual-stmicroelectronics.pdf) |
| Programming Manual 2 | [Reference Manual - M0](https://www.st.com/resource/en/programming_manual/dm00104451-cortexm0-programming-manual-for-stm32l0-stm32g0-stm32wl-and-stm32wb-series-stmicroelectronics.pdf) |
| Board Manual | [Board Manual](https://www.st.com/resource/en/data_brief/nucleo-wl55jc.pdf) |
| Board Schematic | [Board Schematic](https://www.st.com/resource/en/user_manual/dm00622917-stm32wl-nucleo64-board-mb1389-stmicroelectronics.pdf) |
## Flashing the device
The ST Nucleo-wl55jc 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 BOARD=nucleo-wl55jc flash
```
and debug via GDB by simply typing
```
make BOARD=nucleo-wl55jc debug
```
## Supported Toolchains
For using the ST Nucleo-wl55jc board we strongly recommend the usage of the
[GNU Tools for ARM Embedded Processors](https://launchpad.net/gcc-arm-embedded)
toolchain.
*/