AVRTFT

Simple project to drive a TFT LCD like the Adafruit 1.8" Color TFT LCD 160x128 ST7735R with an AVR MCU (ATmega328P) and avr-libc.

Currently implemented:

• Mostly complete UTF-8 set (code points U+0000 to U+00FF) of Hack font with antialiasing (4-Bit greyscale)
• Some emojis (16-Bit RGB)
• Write text in Hack including emojis 🙂
• Draw bitmaps
• Write text and bitmaps via USART
• Upload BMP images via USART (16-Bit 5/6/5 RGB)
• Logging via USART

The AVR is clocked with a crystal for reliable communication via USART.

Ideas:

• Read pictures from SD Card
• Display 4K@50Hz videos...

Write something via USART

Connect to the controller with for example GTKTerm (38400 Baud).
Write some text and a bitmap, and upload a BMP image:

c 0xffff // clear display
d // display the demo
t 0 0 Just some text // write text in Hack to row 0 column 0
b 0 0 1 // write bitmap with index 0 (tiny Linus cat) to row 0 column 0
p 0 0 // prepare to "stream" a 16-Bit (5/6/5) RGB BMP image to row 0 column 0
cat Bali160x128.bmp > /dev/ttyUSB0 // upload a "fullscreen" BMP image

Enter emojis

Emojis are entered with a tabulation char + their "code", i.e. Smile!<TAB>s for a smiling emoji.