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stm32: Lengthen ADC sample time

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Current sample time 1.75us seems too short and some nets with weaker
driver don't convert correctly. Let's lengthen it to 8.75us.

BUG=chrome-os-partner:14319
TEST=See correct voltage level.
BRANCH=none

Change-Id: Ib65a07474787504e5f72522167bafad8bb5730bc
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/42845
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Vic Yang
2013-02-07 10:53:59 +08:00
committed by ChromeBot
parent fe2e8852b9
commit f84a5fa8b1
1 changed files with 4 additions and 4 deletions
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8
chip/stm32/adc.c
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@@ -169,11 +169,11 @@ static void adc_init(void)
STM32_ADC_CR2 &= ~(1 << 11);
/*
* Set sample time of all channels to 1.5 cycles.
* Conversion takes 1.75 us.
* Set sample time of all channels to 7.5 cycles.
* Conversion takes 8.75 us.
*/
STM32_ADC_SMPR1 = 0;
STM32_ADC_SMPR2 = 0;
STM32_ADC_SMPR1 = 0x00249249;
STM32_ADC_SMPR2 = 0x09249249;
}
DECLARE_HOOK(HOOK_INIT, adc_init, HOOK_PRIO_DEFAULT);