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stm32: Reduce keyboard scan period from 10ms to 3ms

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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>
Reviewed-on: https://gerrit.chromium.org/gerrit/34634
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Simon Glass
2012-10-04 09:43:01 -07:00
committed by Gerrit
parent a3a6a9f34b
commit 9bf1539d21
1 changed files with 1 additions and 1 deletions
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2
chip/stm32/keyboard_scan.c
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@@ -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,