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1. Unplug the battery from your drone

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      double-check the battery is unplugged

2. Disconnect the Raspberry Pi from the FC

3. Connect the mini USB cable from your FC to your base station

4. In CFC (see last section), on the top right corner

   

   1. select the correct connection port

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        Details might vary depending on available connections on your base station. The correct port should start with: /dev/tty.usbserial* /dev/cu.usbserial* or /dev/ttyUSB*

   2. Leave the baud rate (number) at the

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      value of 115200

5. Press the “Connect” button and a “Setup” page should greet you with a rendering of your drone (see figure below). Before configuring anything, please read the next section and flash the firmware.

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Checking the existing firmware version

On the top left of the CFC interface, one could check for the Firmware version. For example, in the figure below, the firmware version of the FC is BTFL 3.3.3.

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Prepare for flashing the FC firmware

• If the CFC is still connected to the FC, please press the “Disconnect” button on the top right.

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• In the default Welcome page of CFC, in the left sidebar, please click on the Firmware Flasher tab

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• Configure the options in the tab as below:

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Updating the FC firmware (Flashing the FC)

FCs might have different versions of firmware (i.e., the software that runs on the FC’s micro-controller) out of the factory. Normally, this only needs to be done once initially. Follow this procedure to update your firmware.

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  There are currently 2 types of FC hardware. Use the steps corresponding to your hardware. (more details below)

  IMPORTANT

  During flashing, do not press the “Connect” button in CFC.

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  Our current target firmware is: BTFL 3.3.3 (Download the .hex file below to your base station)

Checking the existing firmware version

On the top left of the CFC interface, please check for the Firmware version. For example, in the figure below, the firmware version of the FC is BTFL 3.3.3.

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Different FC versions

Flash an FC of the ACRO version

This is what an ACRO version FC looks like. Some key features to notice now are:

Version	Picture and key features to notice for this section
ACRO	There is a micro USB port soldered on the board (In the figure blow, on the bottom right of the board ) There is a “BOOT” button. Image Added
OSD	There is no micro USB port As highlighted, the Boot pins are exposed near the “BO”marking. Image Added

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Flashing the FC

The steps videos to flash respectively the ACRO version FC is shown in the video below. A short summary is provided here:

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and the OSD version of FCs are below in this section. A summary is provided here. Most operations are the same with both versions, and any version-wise operations are highlighted with

1. Normally, when connected to the base station, the FC goes in Normal mode

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      there is a red blinking LED

   Holding

   1. unplug from base station

2. To flash the firmware, we would like the FC to be in Bootloader mode instead

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      For the ACRO version, hold the “BOOT” button while connecting the FC to base station

   makes it go in Bootloader mode.

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         Once connected, one could release the boot button

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         there is no red blinking LED. On the ACRO version, there is a solid blue LED

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1. 2. Status
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1. 1. Yellow title

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1. 1. 2

      For the OSD version, use some conductive metal tool to short the “Boot pins” (as highlighted in the previous section)

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1. 1. 1. 2

         Once connected, once could take the pin-shorting material/tool away

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1. 1. 1. Yellow title

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Image RemovedFC(external microUSB) flash firmware.mp4

• SP Racing F3 Acro:

• SP Racing F3 OSD:

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1. 1. 1. 2

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         there is no red blinking LED. On the OSD version, there is no LED on now.

2. In the CFC Firmware Flasher tab, click the Load Firmware [Local] button (bottom right), and select the .hex file downloaded at the beginning of this section.

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      The progress bar should look like “Loaded Local Firmware: (… bytes)”

3. Click the Flash Firmware button (bottom right) and check the progress bar.

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      The progress bar shows: “Flashing…” => “Verifying…” => “Programming SUCCESSFUL”

   2. In case the progress bar turns red, see the Troubleshooting section below

4. If successful, without needing to reconnect the cable, the FC should go back to the Normal mode.

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      Verify the red blinking LED is back on

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      Click “Connect” and verify the firmware version is correct

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This page can be used to do a quick test of the onboard IMU: move the drone and verify that the rendering of the drone moves. Don’t expect it to be perfect as we still need to calibrate everything.

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