Going through this startup procedure is the only way that the application can run.
The startup logic for the P-Star USB bootloader.
6.3. Bootloader I/O pin usage
The bootloader uses the following I/O pins of the microcontroller:
•
D-
and
D+
are used to communicate with the USB host.
•
RB6
is driven high to turn on the yellow LED, but never driven low.
•
RB7
is driven high to turn on the green LED, but never driven low.
The bootloader does not use any other I/O pins.
6.4. Bootloader LED behavior
This section documents the behavior of the P-Star’s LEDs while it is in bootloader mode.
Pololu P-Star User’s Guide
© 2001–2019 Pololu Corporation
6. The P-Star Bootloader
Page 28 of 46
