OFFSET was renamed to OFFSET_Y in ea5a30d9 ("add pause-mode"), while
the call to `draw_leds()` in bc7e3b92 ("Add led activity to ECG app")
still uses the old name. This causes an exception and the ECG app fails
to proceed past the start screen.

Signed-off-by: Rahix <rahix@rahix.de>

with longer 1s press on the TOP_RIGHT buttont you can pause the screen
update. You can then scroll through the increases 4s buffer with
BUTTON_LEFT and BOTTOM_RIGHT. Another press on TOP_RIGHT brings you back
into the normal mode.

The logging operation doesn't get interrupted when pausing the screen.

fleur authored 5 years ago and rahix committed 5 years ago

Fixes #119

Signed-off-by: Rahix <rahix@rahix.de>

Signed-off-by: Rahix <rahix@rahix.de>

Signed-off-by: Rahix <rahix@rahix.de>