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Merge pull request #18646 from maribu/boards/nrf52dk

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boards/nrf52dk: fix doc
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@ -4,91 +4,37 @@
@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 measurement 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 512KiB Flash and
64KiB 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.
The
[nRF52 DK](https://www.nordicsemi.com/Products/Development-hardware/nRF52-DK)
is a development board featuring the nRF52832 MCU with Arduino compatible
pin headers and an integrated J-Link programmer, debugger and UART adapter.
## 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 | 64KiB |
| Flash | 512KiB |
| 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) |
![nRF52 DK](https://www.nordicsemi.com/-/media/Images/Products/DevKits/nRF52-Series/nRF52-DK/nRF52-DK/nRF52-DK-prod-page.png)
##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 | |
|P0.18| D25 | |
|P0.19| D26 | |
|P0.20| D27 | |
|P0.21| RST | RESET |
|P0.22| D28 | near Radio! -> Low drive, low frequency I/O only. |
|P0.23| D29 | near Radio! -> Low drive, low frequency I/O only. |
|P0.24| D30 | near Radio! -> Low drive, low frequency I/O only. |
|P0.25| D00 | near Radio! -> Low drive, low frequency I/O only. |
|P0.26| D01 | near Radio! -> Low drive, low frequency I/O only. |
|P0.27| D02 | near Radio! -> Low drive, low frequency I/O only. |
|P0.28| D03 | near Radio! -> Low drive, low frequency I/O only. |
|P0.29| D04 | near Radio! -> Low drive, low frequency I/O only. |
|P0.30| D05 | LED0, near Radio! -> Low drive, low frequency I/O only. |
|P0.31| D06 | LED1, near Radio! -> Low drive, low frequency I/O only. |
| | V33 | 3.3V for MCU |
| | D16 | ? |
| | D17 | ? |
| | VBUS | 5V input |
| | GND | |
| | RXD | n.c. |
| | TXD | n.c. |
| | TD0 | n.c. |
| | TD1 | n.c. |
| SWDIO | TMS | |
| SWCLK | TCK | |
**Caution**: NFC is not usable with this board.
| MCU | NRF52832 |
|:--------------------- |:------------------------------------------------------------------------------------- |
| Family | ARM Cortex-M4F |
| Vendor | Nordic Semiconductor |
| RAM | 64 KiB |
| Flash | 512 KiB |
| Frequency | 64 MHz |
| 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 |
| MCU Datasheet | [Datasheet](https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF52832) |
| MCU Reference Manual | [Reference Manual](https://infocenter.nordicsemi.com/pdf/nRF52832_PS_v1.4.pdf) |
| Board Datasheet | [User Guide](https://infocenter.nordicsemi.com/pdf/nRF52_DK_User_Guide_v1.3.1.pdf) |
### RESET pin configuration