BLE-UART bridge for the VESC with packet handling and VESC Tool compatibility
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hex Added support for trampa vesc connect Apr 24, 2018
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README.md
ble_app_uart_gcc_nrf51.ld Updated code and linker script to also work with only 16K RAM Nov 28, 2017
crc.c
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main.c Added support for trampa vesc connect Apr 24, 2018
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upload_merged_wt Added support for WT51822-S4AT-compatible modules and updated README Dec 11, 2017

README.md

nrf51_vesc

This is code for a NRF51822 for communicating between the VESC and VESC Tool (linux and mobile) over BLE. After uploading the firmware it can be connected to the VESC as in the picture, and the BLE scanner in VESC Tool should be able to find it and connect. Note that the UART port on the VESC must be enabled with a baud rate of 115200 for this to work.

Connection Example

This should work with any NRF51822 module, such as this one that I'm using:
https://www.ebay.com/itm/Core51822-BLE4-0-Bluetooth-2-4G-Wireless-Module-nRF51822-Onboard-WS82013/281988119330?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

The code can be build with the NRF51822 sdk by changing the path in Makefile, but for convenience a prebuild hex file is also included. It can be uploaded with openocd by running the following script:

./upload_merged

The upload script assumes that the NRF51822 is connected over SWD using an stlink v2 with the following connection:

NRF51822 STLINK V2
GND GND
VDD 3.3V
SDO SWDIO
SCL SWCLK

After that it can be connected to the VESC in the following way

NRF51822 VESC
GND GND
VDD VCC (3.3V)
P0.09 RX
P0.11 TX

Note that a 10 uF ceremaic capacitor between vcc and gnd close to the NRF51 module might be needed if the cables are long. Otherwise the connection can become slow and unstable.