diff options
| author | Vincent Palatin <vpalatin@chromium.org> | 2014-05-14 17:39:30 -0700 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-08-23 02:42:17 +0000 |
| commit | 2e0de3c50f0106264303d2b8b55ec6253d9eda55 (patch) | |
| tree | 1a71cadbfdaa8b1cb7a6476c1cf9c75cf0634c54 /board/zinger/hardware.c | |
| parent | 6f22113a78ba2958128bf129fae80e48148d890e (diff) | |
| download | chrome-ec-2e0de3c50f0106264303d2b8b55ec6253d9eda55.tar.gz | |
zinger: add voltage discharge
When the power supply voltage is transitioning to a lower value, use the
discharging FET to ensure that the voltage is acceptable before
re-enabling the output.
Note: when discharging, we must disable the fast OCP ADC interrupt, but
that is ok because we still have the slow OCP check in board_checks().
BRANCH=none
BUG=chrome-os-partner:28332
TEST=on Zinger, transition from 20V to 5V using Firefly buttons and
observe that we no longer have an over-voltage event. Also, verified
that fast OCP triggering still works after a discharge.
Change-Id: Ie327645e74819aebd1260f5ce16b2ba46a674a7b
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/201577
Reviewed-by: Todd Broch <tbroch@chromium.org>
Diffstat (limited to 'board/zinger/hardware.c')
| -rw-r--r-- | board/zinger/hardware.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/board/zinger/hardware.c b/board/zinger/hardware.c index fd9b86ff15..fc0612eeb9 100644 --- a/board/zinger/hardware.c +++ b/board/zinger/hardware.c @@ -244,6 +244,8 @@ int adc_disable_watchdog(void) STM32_ADC_CFGR1 = 1 << 12; /* Disable interrupt */ STM32_ADC_IER = 0; + /* Clear flags */ + STM32_ADC_ISR = 0x8e; return EC_SUCCESS; } |