README
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These examples are designed to demonstrate the use of libopencm3
with the STM32F4Discovery-DISCO board. This board has a 2.2"
TFT LCD touchscreen on it, a MEMS gyroscope, and 8MB of SDRAM.

If you move through the examples in this order, the code from
the previous example will be used in the next example:

0) blink - verify that you can build a program, link it, and
    download it to the board. Blinks the GREEN LED at about
    2Hz

1) systick_blink - Clock setup, Systick setup, LED GPIO setup
    and blinking.

2) usart - Program a USART on the board as a console (requires
    a digital to serial adapter)

3) usart-irq - Program a USART on the board as a console with
    an interrupt driven receive routine. This allows you to
    interrupt execution with ^C as you can on a Linux process.

4) sdram - SDRAM setup, using the usb port as a console, which
    sets up the SDRAM

5) spi - Serial Peripheral Interface example which talks to
   the MEMS gyroscope on the DISCO board.

6) lcd-serial - Activates the TFT using the SPI port (serial) and
    holds a frame buffer in the SDRAM area.

7) lcd - Now uses the new LCD "driver" peripheral to refresh
    the contents with what is in memory, very fast, write in
    memory and it appears on screen.

8) dma2d - The 2D graphics accelerator device which displays
    various animations on the LCD using code from all of the
    previous examples.