Acromegaly nRF51 is an embedded controller for the adjustable height desk. Access to controller is available through BLE interface by the iOS client app
This resposity is a part of the Acromegaly project - Open Source desk with adjustable height.
Code and structure of this repository bases on a BLE advertising template provided by Nordic. In sake of simplicity, folders for Keil uVision project and for other MCUs was removed.
- GNU Make 3.8+
- nRF5 SDK 11.0.0 (89a8197)
- nrfjprog 9.7.0+
- nRF51822 or nRF51422 MCU (ie. nRF51 DK Board)
- correct MCU wiring
Setup absolute path to nRF5 SDK 11 in pca10028/s130/armgcc/Makefile:
SDK_ROOT := /Users/johndoe/nRF5_SDK_11.0.0_89a8197That its, project is ready to build and flash along with Softdevice:
cd pca10028/s130/armgcc/
make build
make flash_softdevice
make flashDepending of applied connections to MCU and logger configuration, the new BLE advertiser should appear.
In the opposite case, validate connection between nRF51 and Flash memory/UART/Segger according to the Eagle files.
Remind, if the Makefile has set ASMFLAGS += -DNRF_LOG_USES_RTT=1, then Segger SWDIO/SWCLK have to be connected. Otherwise the MCU would not boot.
Depending of the actual desk construction, some geometrical values may be adjusted. Definitions of this values are localized in the config/acromegaly_config.h header:
/** Value used to convert ticks count to more recognizable unit, broadcasted by status service.
* In this case, it's fraction 1*10e-6, where one unit of multiplied ticks equals 1um.
*/
#define TICK_TO_HEIGHT_MULTI 525
/**
* Value in nanometers of minimal countertop position over ground
*/
#define BASE_HEIGHT 834000
/**
* The total number of ticks required to achieve a desk maximum height
*/
#define TICKS_UPPER_LIMIT 816
#define TICK_LOWER_LIMIT 0Logging is supplied by utils library provided by Nordic SDK (utils/nrf_log). Project can be configured to use either UART and/or SeggerRTT. To make selection, set the proper flag in a Makefile.
-DNRF_LOG_USES_RTT=1
JLinkExe -device nRF51422 -speed 4000 -if SWD
JLinkRTTClient-DNRF_LOG_USES_UART=1
screen /dev/tty.usbserial-A602JN7W 115200All BLE items has 4-letter-hex UUIDs alluding to their destination (for better reminding).
Responsible for receiving control instructions, like target position, move direction or switch state.
Position values should be send in little endian order (0xDD04 -> 1245 mm)
Command for stop current movement
| Bytes | Value |
|---|---|
| 0 | uint8 0xAA |
Command for stop current movement
| Bytes | Value |
|---|---|
| 0 | uint8 0x60 |
| 1 - 2 | uint16 targetPosition (mm) |
Initiates movement with target position out of possible bounds. When movement is finished, value of extremum is as as current. This method is designed to reset position counter and minimize position detion error.
| Bytes | Value |
|---|---|
| 0 | uint8 0x88 |
| 1 | uint8 extremumType (Enum) |
where extremumType is:
0xDDBottom extremum
0xFFUpper extremum
Allows to read and to subscribe for current controller state. Value of this characteristic is updated:
- on device initiliazed (after boot/restart)
- on new peer connected
- on internal status changed but with not guarantee of being most recent state
Particular values are transmitted in little endian order.
| Bytes | Value |
|---|---|
| 0 - 3 | int32 currentPosition (µm) |
| 4 - 7 | int32 targetPosition (µm) |
| 8 | uint8 movementState (Enum) |
where movementState enum is:
0xA1None movement
0x92Moves down
0xCBMoves up
In case of new issues, concepts or just a will to say hello:
Copyright 2019 Hubert Andrzejewski
Based on Nordic project and provided by this company license.
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