David Hendricks a3d621f1b2 Add keyboard_scan for STM32 ...

This loosely ports the LM4 keyboard_scan code to STM32

Notable differences:
- Keyboard GPIO layout is spread across multiple ports and is not
  contiguous in many places. Because of this, bitmasks are mostly
  generated on-the-fly instead of hard coded (IO is kept to a minimum)

- Longer timeout when scanning columns (100us versus 20us)

Also, some functions are stubbed out currently since they rely on
other bits being implemented:
- keyboard_state_changed()
- keyboard_has_char()
- keyboard_put_char()

BUG=none
TEST=Tested on STM32L-Discovery (monitoring keystrokes via UART)

Change-Id: I84985879589e70688b2b29b288ab17037f7668b2

2012-02-17 20:30:07 -08:00

..

board.c

Add keyboard_scan for STM32

2012-02-17 20:30:07 -08:00

board.h

Add keyboard_scan for STM32

2012-02-17 20:30:07 -08:00

build.mk

add the skeleton for STM32L chip and discovery board

2012-01-26 16:50:55 -08:00

ec.tasklist

Add keyboard_scan for STM32

2012-02-17 20:30:07 -08:00