nRF52 DK¶
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:¶
| 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 |
| 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 |
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.
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.