aqmon

DIY indoor air quality monitor

Building

dnf install arm-none-eabi-gcc arm-none-eabi-newlib
ln -s ../libopencm3

Flashing

sudo openocd -c "bindto 0.0.0.0" -f rpi1.cfg -c "transport select swd" -c "adapter speed 1000" -f target/stm32f1x.cfg

program firmware.elf verify reset

Raspberry Pi configuration

Uncomment this line in /boot/config.txt:

dtparam=spi=on

Note: This will automatically expose spi0.0 and spi0.1 under /sys/bus/spi/devices/ and they will be bound by default to the spidev driver. No manual configuration is needed. This is because the spidev driver is patched in the Raspberry Pi kernel to accept a compatible = "spidev" Device Tree binding and suppress the notorious warning about the binding. The devices are defined in arch/arm/boot/dts/bcm2708-rpi-*, for example: arch/arm/boot/dts/bcm2708-rpi-zero-w.dts.