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pico-build

This repo is the source code, and provides instructions, for building the .elf file that is loaded to the RP2040 chip (its RAM) on the Pioreactor HAT.

Building on a Raspberry Pi

  • on a Raspberry Pi, follow the setup instructions in Chapter 1. Quick Pico Setup of the datasheet.
  • mkdir ~/pico/pico-examples/pioreactor && cd ~/pico/pico-examples/pioreactor
  • move main.c and CMakeLists.txt from this repo to the cwd
  • cp ../../pico-sdk/external/pico_sdk_import.cmake .
  • mkdir pioreactor/build && cd build
  • export PICO_SDK_PATH=../../../pico-sdk
  • cmake .. && make
  • if a RP2040 is connected over SWD, you can upload with openocd -f interface/raspberrypi-swd.cfg -f target/rp2040.cfg -c "init" -c "reset halt" -c "load_image main.elf" -c "resume 0x20000000" -c "exit"

Use

Implements the following i2c API

  1. Write to any of the first 4 addresses (0, 1, 2, 3) to set the duty cycle of the corresponding PWM
  2. Read from any of the next 4 addresses (4, 5, 6, 7) to get a 16 bit ADC value of the corresponding ADC
  3. Read from address 8 to return the version of this code.

Here are some examples of using i2cset and i2cget to interact with this program:

To set the duty cycle of the PWM channel corresponding to address 0 to 75%, you could use the following i2cset command:

i2cset -y 1 0x2C 0 0xC0

To read the 16-bit ADC value of the ADC channel corresponding to address 4, you could use the following i2cget command:

i2cget -y 1 0x2C w 4

Note that the -y flag is used to automatically answer yes to any prompt from i2cset or i2cget. The 1 after the -y flag specifies the i2c bus number to use, and the 0x2C specifies the i2c address of the peripheral. The 0 and w in the i2cset and i2cget commands, respectively, specify the starting register address to be accessed. The 4 in the i2cget command specifies the address of the ADC channel to read.