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| author | Simon Glass <sjg@chromium.org> | 2012-10-04 09:43:01 -0700 |
|---|---|---|
| committer | Randall Spangler <rspangler@chromium.org> | 2012-10-05 12:31:53 -0700 |
| commit | e5ef4ef19ce392a71a1a8cf38a526f1d2cb484d1 (patch) | |
| tree | 9ec5a90d9e796dfd5537e2192a03632f9532b63c | |
| parent | 86a3b439b6f831e26cc588a3ed219afab36a87ad (diff) | |
| download | chrome-ec-e5ef4ef19ce392a71a1a8cf38a526f1d2cb484d1.tar.gz | |
stm32: Reduce keyboard scan period from 10ms to 3ms
Experimentally it is possible to press a key on snow for only 4.8ms.
We should aim to scan more frequently to catch those who only just
touch the keys, or type very quickly.
It takes a little over 2ms to complete a keyboard scan at present.
We shold aim to reduce this, but for now, it seems safe to reduce the
default scanning frequency to 3ms.
BUG=chrome-os-partner:12179
TEST=manual
Type on keyboard on snow in browser, and see that we still get results
and the EC is stable.
Change-Id: I60827c33a58c34dd808504e58bca480bd61f5932
BRANCH=snow
Signed-off-by: Simon Glass <sjg@chromium.org>
(cherry picked from commit 83db13330bb744a171d65da9378c0915d8d02d5d)
Reviewed-on: https://gerrit.chromium.org/gerrit/34771
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Randall Spangler <rspangler@chromium.org>
| -rw-r--r-- | chip/stm32/keyboard_scan.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/chip/stm32/keyboard_scan.c b/chip/stm32/keyboard_scan.c index 91c6d0b1b9..92c5c2f74d 100644 --- a/chip/stm32/keyboard_scan.c +++ b/chip/stm32/keyboard_scan.c @@ -93,7 +93,7 @@ static struct ec_mkbp_config config = { EC_MKBP_VALID_DEBOUNCE_UP | EC_MKBP_VALID_FIFO_MAX_DEPTH, .valid_flags = EC_MKBP_FLAGS_ENABLE, .flags = EC_MKBP_FLAGS_ENABLE, - .scan_period_us = 10000, + .scan_period_us = 3000, .poll_timeout_us = 100 * 1000, .min_post_scan_delay_us = 1000, .output_settle_us = 50, |