I have it working with the following bash script:

SWCLK=25
SWDIO=24
SRST=18

echo "Exporting SWCLK and SRST pins."
echo $SWCLK > /sys/class/gpio/export
echo $SRST > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio$SWCLK/direction
echo "out" > /sys/class/gpio/gpio$SRST/direction

echo "Setting SWCLK low and pulsing SRST."
echo "0" > /sys/class/gpio/gpio$SWCLK/value
echo "0" > /sys/class/gpio/gpio$SRST/value
echo "1" > /sys/class/gpio/gpio$SRST/value

echo "Unexporting SWCLK and SRST pins."
echo $SWCLK > /sys/class/gpio/unexport
echo $SRST > /sys/class/gpio/unexport

echo "Ready for OpenOCD."

openocd -c "adapter driver bcm2835gpio; \\
bcm2835gpio peripheral_base 0xFE000000; \\
bcm2835gpio speed_coeffs 236181 60; \\
adapter gpio swclk $SWCLK; \\
adapter gpio swdio $SWDIO; \\
adapter gpio srst $SRST; \\
transport select swd; \\
set CHIPNAME samc21; \\
source [find target/at91samdXX.cfg]; \\
reset_config srst_only; \\
adapter speed 276; \\
init; \\
reset; \\
reset; \\
at91samd chip-erase; \\
at91samd bootloader 0; \\
program Duet3Bootloader-SAMC21.elf verify; \\
reset; \\
shutdown"

echo "Done."

This is adapted from here.

@oliof I posted a script to flash 1LC boards using OpenOCD and a Pi elsewhere on the forum.

Seeing this thread, I really wish I had spent time making that band-aid test print use a bit less plastic...

@oliof yeah, that’s it. Huge pain to figure that out. I’ll add docs to klipper eventually, but it’s not my priority at the moment. Meanwhile it should be easy enough to figure out by looking at the schematics.

Just want to chime in and say that this is a really cool project, I’m impressed with the work!

@oliof yeah, that’s it. Huge pain to figure that out. I’ll add docs to klipper eventually, but it’s not my priority at the moment. Meanwhile it should be easy enough to figure out by looking at the schematics.

@oliof I posted a script to flash 1LC boards using OpenOCD and a Pi elsewhere on the forum.

I have it working with the following bash script:

SWCLK=25
SWDIO=24
SRST=18

echo "Exporting SWCLK and SRST pins."
echo $SWCLK > /sys/class/gpio/export
echo $SRST > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio$SWCLK/direction
echo "out" > /sys/class/gpio/gpio$SRST/direction

echo "Setting SWCLK low and pulsing SRST."
echo "0" > /sys/class/gpio/gpio$SWCLK/value
echo "0" > /sys/class/gpio/gpio$SRST/value
echo "1" > /sys/class/gpio/gpio$SRST/value

echo "Unexporting SWCLK and SRST pins."
echo $SWCLK > /sys/class/gpio/unexport
echo $SRST > /sys/class/gpio/unexport

echo "Ready for OpenOCD."

openocd -c "adapter driver bcm2835gpio; \\
bcm2835gpio peripheral_base 0xFE000000; \\
bcm2835gpio speed_coeffs 236181 60; \\
adapter gpio swclk $SWCLK; \\
adapter gpio swdio $SWDIO; \\
adapter gpio srst $SRST; \\
transport select swd; \\
set CHIPNAME samc21; \\
source [find target/at91samdXX.cfg]; \\
reset_config srst_only; \\
adapter speed 276; \\
init; \\
reset; \\
reset; \\
at91samd chip-erase; \\
at91samd bootloader 0; \\
program Duet3Bootloader-SAMC21.elf verify; \\
reset; \\
shutdown"

echo "Done."

This is adapted from here.

@dc42 said in Raspberry Pi 4 to Toolboard 1LC with OpenOCD:

@Wulfsta the debug build configuration I have for the Tool1LC is for running without the bootloader. To use it, you would need to remove the bootloader protection, then write it to flash memory via SWD. Then to use the tool board normally again, you would need to reinstall the bootloader, again via SWD. The only tool I have ever done this with is an Atmel ICE. So unless you already have one, I can't recommend this route.

Yeah, if I had one I’d just erase the chip using that… I do wonder why I can’t get OpenOCD working - maybe it’s the frequency or pulse width?

Edit: I should mention that I’m trying to connect under reset as the OpenOCD docs suggest, and still no luck.

@dc42 Could you provide a debug build I can use for this purpose? I don't want to set up all the tooling to build RRF...

@gloomyandy Ah yeah, I saw this page, but didn't have a close enough look at it. Thanks for the help though!

Similarly to this klipper PR, I'm looking for functionality that will correct for frame expansion as a function of temperature.

@gloomyandy I actually have no idea how to do this, and a cursory look at the docs didn't seem to suggest it's well-known; do you happen to have a reference that I could look at, or example of someone doing this? Or at least, a link to where this is located in the OpenOCD docs?

Seeing this thread, I really wish I had spent time making that band-aid test print use a bit less plastic...