dev environment

rust

container definition lives here.

start container

doas podman run --rm -v /home/bjc/src:/home/bjc/src -it --name luchie -h luchie luchie

openocd

can i make this eshell?

ssh psyduck "cd luchie && ./m openocd"

console

ssh -t psyduck "cd luchie && ./m console"

mis-timed clocks

bad uart timings and failing to init usb is a result of using mon reset init with (at least) the pitaya link debugger. maybe others: i haven't tested them.

workarounds include:

• using mon reset and interrupting or setting a breakpoint on main
• mon reset init followed by load and continue

cirque trackpad

what the fuck did i do with the code i had for this which did the setup and read the spi registers??

gd32vf103-start board

looks like the start board is a gd32vf103cbt from the tiny print silk-screened on the chip. TME says it's a gd32vf103d6t6 — but gigadevice says gd32vf103cbt6

which means it has 128k flash and 32k sram and 37(!) gpio pins

interrupt vector table is 4096 words starting from the start of flash (mtvt register). _start should be at the end of the vector.

according to the user manual (pg 51), at least when waking up, the system boots from 0x0000_0000 (which is an alias to the start of the main flash, iirc)

usb is 2.0 full-speed (12Mbps)

USART

On github it says that uart0 tx/rx is gpio 9/10 — but that's for the eval board. See the risc-v repository for a printf example. The zephyr documentation for it indicates the usb is on usart0 with tx/rx pins pa9 / pa10