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-rw-r--r--tests/adc-power/adc-power.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/adc-power/adc-power.c b/tests/adc-power/adc-power.c
index a188649..97a083a 100644
--- a/tests/adc-power/adc-power.c
+++ b/tests/adc-power/adc-power.c
@@ -66,6 +66,7 @@ void adc_power_init(void)
/* same same but different */
rcc_periph_clock_enable(RCC_ADC1);
ADC_CR(ADC1) &= ~ADC_CR_DEEPPWD;
+ RCC_CCIPR |= 3 << 28; // system clock as adc clock. (with CKMODE == 0)
adc_enable_regulator(ADC1);
#else