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boards/cc2650-launchpad: update documentation

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Signed-off-by: Jean Pierre Dudey <me@jeandudey.tech>
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@defgroup boards_cc2650_launchpad TI CC2650 LaunchPad XL
@ingroup boards
@brief Texas Instruments SimpleLink(TM) CC2650 Wireless MCU LaunchPad(TM) Kit
*/
## <a name="cc2650_launchpad_toc"> Table of Contents </a> &nbsp;[[TOC]](#cc2650_launchpad_toc)
1. [Overview](#cc2650_launchpad_overview)
2. [Hardware](#cc2650_launchpad_hardware)
3. [Board pinout](#cc2650_launchpad_pinout)
4. [Flashing the Device](#cc2650_launchpad_flashing)
## <a name="cc2650_launchpad_overview"> Overview </a> &nbsp;[[TOC]](#cc2650_launchpad_toc)
The [LAUNCHXL-CC2650](https://www.ti.com/tool/LAUNCHXL-CC2650) is a Texas
Instrument's development kit for the CC2650 SoC MCU which combines a Cortex-M3
microcontroller alonside a dedicated Cortex-M0 to control the radio.
## <a name="cc2650_launchpad_hardware"> Hardware </a> &nbsp;[[TOC]](#cc2650_launchpad_toc)
![LAUNCHXL-CC2650](https://www.ti.com/diagrams/launchxl-cc2650_launchxl-cc2650.jpg)
| MCU | CC2650 |
|:----------------- |:--------------------- |
| Family | ARM Cortex-M3 |
| Vendor | Texas Instruments |
| RAM | 20KiB |
| Flash | 128KiB |
| Frequency | 48MHz |
| FPU | no |
| Timers | 4 |
| ADCs | 1x 12-bit (channels) |
| UARTs | 1 |
| SPIs | 2 |
| I2Cs | 1 |
| Vcc | 1.8V - 3.8V |
| Datasheet | [Datasheet](https://www.ti.com/lit/ds/symlink/cc2650.pdf) |
| Reference Manual | [Reference Manual](https://www.ti.com/lit/ug/swcu117i/swcu117i.pdf) |
## <a name="cc2650_launchpad_pinout"> Board pinout </a> &nbsp;[[TOC]](#cc2650_launchpad_toc)
The [CC2650 Quick Start Guide](https://www.ti.com/lit/ml/swru451/swru451.pdf)
provides the default pinout for the board.
## <a name="cc2650_launchpad_flashing"> Flashing the Device </a> &nbsp;[[TOC]](#cc2650_launchpad_toc)
Flashing RIOT is quite straight forward. The board comes with an XDS110 on-board
debug probe that provides programming, flashing and debugging capabilities
through the USB Micro-USB connector. Once either TI Uniflash or OpenOCD are
installed just connect the board using the Micro-USB port to your computer and
type:
```
make flash BOARD=cc2650-launchpad
```
To use OpenOCD instead of uniflash we need to set the `PROGRAMMER` environment
variable, this is to enable OpenOCD instead of Uniflash.
```
export PROGRAMMER=openocd
```
Now we can just do `make flash` and `make debug`, this all using OpenOCD.
For detailed information about CC1312 MCUs as well as configuring, compiling
RIOT and installation of flashing tools for CC1312 boards,
see \ref cc26xx_cc13xx_riot.
*/