<commit_before>/**
@defgroup    boards_nrf52dk nRF52 DK
@ingroup     boards
@brief       Support for the nRF52 DK

## Overview:
There are some nameless simple development Boards with an nRF52832 available.
These boards providing access to most SoC ports. There are two buttons (RST,
KEY), two LED’s (Pin 30, 31), a voltage regulator and a current messurment shunt
on board. A serial connection and flashing must be provided by external
Hardware.

The nRF52832 is a SoC with a 32-bit ARM® Cortex™-M4F CPU with 512kB Flash and
64kB RAM. The embedded 2.4GHz transceiver supports Bluetooth low energy, ANT and
proprietary 2.4 GHz protocol stack. It is on air compatible with the nRF51
Series, nRF24L and nRF24AP Series products from Nordic Semiconductor.

## Hardware:
![nRF52 minimal development
board](https://github.com/d00616/temp/raw/master/nrf52-minidev.jpg)

| MCU        | NRF52832      |
|:------------- |:--------------------- |
| Family | ARM Cortex-M4F    |
| Vendor | Nordic Semiconductor  |
| RAM        | 64Kb  |
| Flash      | 512Kb             |
| Frequency  | 64MHz |
| FPU        | yes               |
| Timers | 5 (32-bit)    |
| RTC    | 3 |
| ADCs       | 1x 12-bit (8 channels)        |
| UARTs      | 1                 |
| SPIs       | 3                 |
| I2Cs       | 2                 |
| I2S        | 1                 |
| PWM        | 3*4 Channels              |
| Radio         | 2.4GHz BLE compatiple, -20 dBm to +4 dBm output, -96 dBm RX sensitivity |
| Vcc        | 1.7V - 3.6V           |
| Datasheet  | [Datasheet](https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52832) |
| Reference Manual | [Reference Manual](http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52%2Fdita%2Fnrf52%2Fnrf52_series.html&cp=1) |

##Pin layout

|MCU pin|Board pin|Function|
|:-----------|:-----------|:----------|
|P0.0| n.c. | |
|P0.1| n.c. | |
|P0.2| D07 | |
|P0.3| D08 | |
|P0.4| D09 | KEY |
|P0.5| D10 | |
|P0.6| D13 | |
|P0.7| D14 | |
|P0.8| D15 | |
|P0.9| n.c. | |
|P0.10| n.c. | NFC antenna 2 (unusable) |
|P0.11|  D18 | RXD (software defined) |
|P0.12|  D19 | TXD (software defined) |
|P0.13|  D20 | |
|P0.14|  D21 | |
|P0.15|  D22 | |
|P0.16|  D23 | |
|P0.17|  D24 | |<commit_msg>boards/nrf52dk: fix broken links<commit_after>/**
@defgroup    boards_nrf52dk nRF52 DK
@ingroup     boards
@brief       Support for the nRF52 DK

## Overview:
There are some nameless simple development Boards with an nRF52832 available.
These boards providing access to most SoC ports. There are two buttons (RST,
KEY), two LED’s (Pin 30, 31), a voltage regulator and a current messurment shunt
on board. A serial connection and flashing must be provided by external
Hardware.

The nRF52832 is a SoC with a 32-bit ARM® Cortex™-M4F CPU with 512kB Flash and
64kB RAM. The embedded 2.4GHz transceiver supports Bluetooth low energy, ANT and
proprietary 2.4 GHz protocol stack. It is on air compatible with the nRF51
Series, nRF24L and nRF24AP Series products from Nordic Semiconductor.

## Hardware:
![nRF52 minimal development
board](https://github.com/d00616/temp/raw/master/nrf52-minidev.jpg)

| MCU        | NRF52832      |
|:------------- |:--------------------- |
| Family | ARM Cortex-M4F    |
| Vendor | Nordic Semiconductor  |
| RAM        | 64Kb  |
| Flash      | 512Kb             |
| Frequency  | 64MHz |
| FPU        | yes               |
| Timers | 5 (32-bit)    |
| RTC    | 3 |
| ADCs       | 1x 12-bit (8 channels)        |
| UARTs      | 1                 |
| SPIs       | 3                 |
| I2Cs       | 2                 |
| I2S        | 1                 |
| PWM        | 3*4 Channels              |
| Radio         | 2.4GHz BLE compatiple, -20 dBm to +4 dBm output, -96 dBm RX sensitivity |
| Vcc        | 1.7V - 3.6V           |
| Datasheet  | [Datasheet](https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52832) |
| Reference Manual | [Reference Manual](https://infocenter.nordicsemi.com/pdf/nRF52832_PS_v1.4.pdf) |

##Pin layout

|MCU pin|Board pin|Function|
|:-----------|:-----------|:----------|
|P0.0| n.c. | |
|P0.1| n.c. | |
|P0.2| D07 | |
|P0.3| D08 | |
|P0.4| D09 | KEY |
|P0.5| D10 | |
|P0.6| D13 | |
|P0.7| D14 | |
|P0.8| D15 | |
|P0.9| n.c. | |
|P0.10| n.c. | NFC antenna 2 (unusable) |
|P0.11|  D18 | RXD (software defined) |
|P0.12|  D19 | TXD (software defined) |
|P0.13|  D20 | |
|P0.14|  D21 | |
|P0.15|  D22 | |
|P0.16|  D23 | |
|P0.17|  D24 | |
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