22 lines
1.1 KiB
Markdown
22 lines
1.1 KiB
Markdown
# Slideshow
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This project is a relatively simple slideshow running on the Adafruit Feather
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328P (an ATmega328p-microcontroller) using a simple button and a 240x240 LCD
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display with the ST7789-driver over
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[SPI](https://en.wikipedia.org/wiki/Serial_Peripheral_Interface).
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This project is written on Rust and uses a very minimal amount of libraries with
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the most significant being [`atmega-hal`](https://github.com/Rahix/avr-hal), a
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hardware abstraction layer for ATmega-microcontrollers. Images are stored in the
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[program memory](https://en.wikipedia.org/wiki/Flash_memory) of the device and
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manually read using the `lpm`-instruction using inline-assembly because Rust
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itself does not produce this instruction in any scenario. The images are stored
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in the [QOI-specification](https://qoiformat.org/qoi-specification.pdf) to save
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space, and they are decoded on-the-fly when rendering the images. Communication
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between the display and the microprocessor is done manually using a [minimal
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SPI-utility](https://rahix.github.io/avr-hal/atmega_hal/spi/type.Spi.html)
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within the `atmega-hal` crate.
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## Demonstration
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