4ms Company Dual Looping Delay Manual del usuario - Página 18
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Audio Bootloader
The Looping Delay contains a bootloader that is used to update the firmware by playing an audio file
into the In jack on the left side of the module. Firmware audio files can be downloaded from the 4ms
website at
https://4mscompany.com/ld
1. To enter bootloader mode, power off the Looping Delay and connect a computer or smart
phone audio output to the In jack. Either a stereo or mono cable is fine. Connect the Send jack
to an amp/speakers so you can listen.
2. Set the computer/phone's volume to 50%. You may need to adjust it up or down if this is too
loud or quiet (see step 5). Unlike other 4ms modules, the Looping Delay's bootloader is
designed to work with consumer line-level signal (a peak-to-peak voltage of a little under 1V is
ideal, or -10dbV). Turn off all audio notifications that might interrupt playback.
3. Depress the Reverse and Inf. Hold buttons while powering on the Looping Delay. When you
see either button blink, release the buttons.
4. If Reverse is blinking, press the Reverse button. Inf. Hold will start blinking to indicate the
module is now ready to receive firmware.
5. Begin playing the file. Immediately you should see the Inf. Hold and Ping lights flash. Do not
interrupt this process!
6. The Inf. Hold light blinks in a way that tells you if the audio is too loud or quiet. If it blinks
erratically, then the audio is too loud or too quiet. If it blinks regularly with equal times on and
off, then the audio level is ideal. A good way to set the level is to start with the volume all the
way down and notice the the light is off. Then slowly bring it up until it flashes regularly (about
four times per second with equal times on and off).
7. If there's an error, the Reverse light will start blinking about three times per second, and the
Ping light will be off. The Inf. Hold light will continue to indicate the audio level, so this is a
good time to verify the level is ideal and adjust the output level as needed. Verify the cable is
not loose, all sounds/vibrate/notifications are off, and that you have downloaded the audio file
completely (avoid streaming or playing from the browser). Stop the audio file, reset it back to
the start, and tap the Reverse button to reset. The Inf. Hold button should blink slowly. Play
the file from the beginning again.
8. If the file loads successfully, the Reverse button will blink once every two seconds and the
Ping button will blink every second. Press Inf. Hold to start playing.
The open-source licensed source files (in C++, for compiling with arm-none-eabi-g++) can be found at
https://www.github.com/4ms/looping-delay
Firmware Version
To view the firmware version, hold down Reverse and Ping while powering up. After you release the
buttons, the red light will flash to indicate the firmware version. Power off.
Firmware v1.0 (released June 2023)
Flash once
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