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1-wire passthrough esc programming

ESCs must have the BlHeli Bootloader.

If your ESCs didn't come with BlHeli Bootloader, you'll need to flash them with an ArduinoISP programmer first. Here's a guide.

This is the option you need to select for the bootloader:

Flashing BlHeli Bootloader

Currently supported on the STM32F3DISCOVERY, NAZE32 (including clones such as the FLIP32) and CC3D.

Wiring

  • For the NAZE, no external wiring is necessary. Simply plugin the board via USB cable.

  • For the CC3D, connect a USB to UART adapter to the main port. If you need one, I prefer the CP2102 as it is cheap and the driver is readily available.

    • This is how you plug in the USB/UART adapter on the CC3D. Be sure to also plug in the normal USB cable as well.

    Flashing BlHeli Bootloader

  • In the case that your board does not power on fully without a battery attached, it is OK to attach the battery before following the steps below. However, it may not be necessary in all cases.

Usage

How to for the CC3D: https://youtu.be/fmUPL1lRcss

  • Plug in the USB cable and connect to your board with the CleanFlight configurator.

  • Open the CLI tab, then run: 1wire <esc index>

    E.g. to connect to the ESC on your flight controller's port #1, run the command:

    1wire 1

  • Click "Disconnect" in the CleanFlight configurator. Do not power down your board.

    • Note, in the future it may be possible to configure your ESCs directly in CleanFlight.

  • Open the BlHeli Suite.

  • Ensure you have selected the correct Atmel or SILABS "(USB/Com)" option under the "Select ATMEL / SILABS Interface" menu option.

  • Ensure you have the correct port selected.

    • On the NAZE, this port will be the same COM port used by the CleanFlight configurator.

    • On the CC3D, this port will be your USB to UART serial adapter.

  • Click "Connect" and wait for the connection to complete. If you get a COM error, hit connect again. It will probably work.

  • Click "Read Setup"

  • Use BlHeli suite as normal.

  • When you're finished with one ESC, click "Disconnect"

  • Unplug the flight control board from Blheli.

    • On the CC3D this means you can unplug just the USB/UART adapter, leaving the USB cable attached. The advantage is that Cleanflight will stay connected and you'll only have to reconnect BlHeli.

    • On the NAZE you'll have to unplug USB cable and start over on the next ESC.

Implementing and Configuring targets

The following parameters can be used to enable and configure this in the related target.h file:

USE_SERIAL_1WIRE              Enables the 1wire code, defined in target.h

  • For new targets

    • in target.h

      // Turn on serial 1wire passthrough
#define USE_SERIAL_1WIRE
// How many escs does this board support?
#define ESC_COUNT 6
// STM32F3DISCOVERY TX - PC3 connects to UART RX
#define S1W_TX_GPIO         GPIOC
#define S1W_TX_PIN          GPIO_Pin_3
// STM32F3DISCOVERY RX - PC1 connects to UART TX
#define S1W_RX_GPIO         GPIOC
#define S1W_RX_PIN          GPIO_Pin_1

    • in serial_1wire.c

      // Define your esc hardware
#if defined(STM32F3DISCOVERY) && !(defined(CHEBUZZF3))
const escHardware_t escHardware[ESC_COUNT] = {
  { GPIOD, 12 },
  { GPIOD, 13 },
  { GPIOD, 14 },
  { GPIOD, 15 },
  { GPIOA, 1 },
  { GPIOA, 2 }
};

Development Notes

On the STM32F3DISCOVERY, an external pullup on the ESC line may be necessary. I needed a 3v, 4.7k pullup.

Todo

Implement the BlHeli bootloader configuration protocol in the CleanFlight GUI