Support for the nRF52 DK. More...
Detailed Description
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.
Hardware:
| 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 |
| Reference Manual | Reference Manual |
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.
RESET pin configuration
On many (all?) nrf52dk boards, the reset pin is not configured out-of-the box. This means, that simply nothing happens if the RESET pin is pressed. To change this, RIOT provides a little tool in dist/tools/nrf52_resetpin_cfg.
Simply compile, flash, and run that tool on your board, and the reset pin should work for the time being.
Current measurement:
There are two pins for current measurement on board. Don't connect these pins to GND!. The left pin is at 3.3V level and the right pin is connected to V33. Divide the measured voltage between this pins by 22 to get the current.
Flash the board
See the Flashing section in nRF52 common.
Accessing STDIO via UART
The STDIO is directly accessible via the USB port. On a Linux host, it's generally mapped to /dev/ttyACM0.
Use the term target to connect to the board serial port
Files | |
| file | board.h |
| Board specific configuration for the nRF52 DK. | |
| file | periph_conf.h |
| Peripheral configuration for the nRF52 DK. | |
