David Hendricks 2f229ea226 stm32: make read_raw_input_state() more portable ...

This re-factors read_raw_input_state() to use GPIO port and mask
values from the board's gpio_list array. This eliminates the reliance
on hard-coded bit mask values and ports, thus making the code
adaptable for future designs.

As a slight optimization, the GPIO input data register is re-read
only if the port changes from the previous iteration. Thus, it's best
if the GPIOs are listed such that changes to the port address are
minimized.

BUG=none
BRANCH=none
TEST=Tested on Snow by running finger across keys.

Change-Id: I4a79363f060f37690bfebfd6763f7bfe6cb7991a
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/44993
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

2013-03-13 14:14:02 -07:00

..

lm4

Wait to power on system until battery state is known

2013-03-05 10:26:20 -08:00

stm32

stm32: make read_raw_input_state() more portable

2013-03-13 14:14:02 -07:00