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Blinka uses lgpio, so we get hardware pwm

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Joseph Timothy Foley
2026-07-05 19:53:58 +00:00
parent 33914344ff
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README.md
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@@ -8,6 +8,7 @@ Scripts and documentation for setting up a Raspberry Pi (Zero W 1 or 2) for use
1. [Solder the GPIO header pins](solder-gpio.md) 1. [Solder the GPIO header pins](solder-gpio.md)
1. [Gadget Mode to setup a serial connection over USB](gadget.md) 1. [Gadget Mode to setup a serial connection over USB](gadget.md)
1. [Marcel's script on github to show the IP address on the OLED screen](https://github.com/mkyas/cpsy-display-ip) 1. [Marcel's script on github to show the IP address on the OLED screen](https://github.com/mkyas/cpsy-display-ip)
1. Install Blinka by following the guide [CircuitPython Libraries on Linux and Raspberry Pi](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi)]
## RU student-only guides at ROB-IOT ## RU student-only guides at ROB-IOT
- [Starting on Raspberry Pi Zero](https://reykjavik.instructure.com/courses/6589/pages/starting-on-raspberry-pi-zero-w) - [Starting on Raspberry Pi Zero](https://reykjavik.instructure.com/courses/6589/pages/starting-on-raspberry-pi-zero-w)
pwm.md
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@@ -4,15 +4,20 @@ The Raspberry Pi zero (1 and 2) have 2 PWM peripherals, allowing you to pulse pi
# References # References
- [CircuitPython Libraries on Linux and Raspberry Pi](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi)
- [Raspberry Pi Official Overlays information (github)](https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README) - [Raspberry Pi Official Overlays information (github)](https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README)
- Line 4235 starts the description of the "pwm" overlay configuration - Line 4235 starts the description of the "pwm" overlay configuration
- [Adding Basic Audio Ouput to Raspberry Pi Zero](https://learn.adafruit.com/adding-basic-audio-ouput-to-raspberry-pi-zero/pi-zero-pwm-audio) - [Adding Basic Audio Ouput to Raspberry Pi Zero](https://learn.adafruit.com/adding-basic-audio-ouput-to-raspberry-pi-zero/pi-zero-pwm-audio)
- [CircuitPython pwmio documentation](https://docs.circuitpython.org/en/latest/shared-bindings/pwmio/index.html)
# Important Points # Important Points
1. The `gpio` program is no longer available. It has been replaced with `pinctrl` which works a little differently. 1. The `gpio` program is no longer available. It has been replaced with `pinctrl` which works a little differently.
1. The Blinka/CircuitPython interface uses `lgpio` to do hardware PWM on the pins. This requires the `pwm-2chan` overlay to be setup correctly, which it's documented procedure does. Details on relevant pins on line 4267 of the [overleays README](https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README)
# Discussion # Discussion
My raspberry pi zero W 2 wasn't working reliably with the PWM. My raspberry pi zero W 2 wasn't working reliably with the PWM.
The `gpio` command has been depricated and is now replaced by the `pinctrl` commend. Running it did not list any PWM0 on any of the pins, which was concerning. The `gpio` command has been depricated and is now replaced by the `pinctrl` commend. Running it did not list any PWM0 on any of the pins, which was concerning.