Add a UART bootloader #58
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emanuelen5
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emanuelen5
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…it to the bootloader
* Add simavr simulator * Remove some redundant headers * Move avr object into main * Remove vcd * Use fuse values for bootloader * Extract predicate * Use getopts to parse arguments Break out argument parsing into a function * Ignore flash image run output * Add debug configuration for running with vscode * Rename the simulator * Create Github action for building * Move UART usages closer to each other * Break out function for filling flash with main program * Break out function for adding flash dump hook * Exit simulator when bootloader finishes * Draw the status LEDs using OpenGL * Fix: Make simulator dump flash at finish * Only draw the pins connected to LEDs * Use a single interrupt for the whole PORT C * Break out GLUT init function * WIP: Implement state machine for receiving programmer data * Break out graphics functions into their own file * Remove unhelpful comments * Add more debug info * WIP: Update vector table before bootloader * Use own fork of simavr that has interrupt table patch * Deinit millis interrupts to make sure we don't get bootloader interrupt when moving to the application * Convert to assembly function This makes sure they work regardless of optimization level in the compiler * Bump simavr
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It's too slow to do in the middle
This way we remove the dependency on millis in the bootloader
This way we can compile the state machine even on non-AVR.
emanuelen5
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This improves the speed of the protocol significantly since we don't have to wait until the read command times out. Benchmark before: - time between packets: 400-450 ms - total time to flash millis: 3.1 s Benchmark after: - time between packets: 20-30 ms (~17x speedup) - total time to flash millis: 630 ms (~5x speedup)
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I improved the bootloader efficiency quite a bit in 6cfe3d9 This improves the speed of the protocol significantly since we don't BeforeBenchmark before:
AfterBenchmark after:
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The order of the arguments was switched up
Otherwise we don't get the required performance
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I managed to shave off some more time by making some things a bit faster and then increasing the baud rate to 62500. Now it takes 210 ms to flash the millis program (14x total speedup compared to the original baseline).
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nperozzi
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Jun 17, 2025
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How to use it:
Flash the bootloader
# Upload the bootloader and set the required fuses pio run -e bootloader -t uploadUse the bootloader
TODO