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Bare-metal UART, Bluetooth, and SPI

Bare-metal AVR C on an ATmega328: a hand-written UART driver, HC-05 Bluetooth setup, and SPI bring-up, with no Arduino framework.

highlights

• Interrupt-driven UART with a receive-line buffer and separate data/command baud rates.
• A bt_configurer program that sends AT commands and parses the OK responses to configure an HC-05 module.
• A bt_mega program that drives buttons and LEDs over the Bluetooth link, plus an SPI implementation (spi.c/spi.h).
• Direct register, DDR, and PORT manipulation and ISRs, built with hand-written Makefiles.

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