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-rw-r--r--src/stm32/stm32h7_adc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/stm32/stm32h7_adc.c b/src/stm32/stm32h7_adc.c
index 792a3335..2733b24f 100644
--- a/src/stm32/stm32h7_adc.c
+++ b/src/stm32/stm32h7_adc.c
@@ -114,7 +114,9 @@ gpio_adc_setup(uint32_t pin)
ADC_TypeDef *adc;
if (chan >= 40){
adc = ADC3;
- enable_pclock(ADC3_BASE);
+ if (!is_enabled_pclock(ADC3_BASE)) {
+ enable_pclock(ADC3_BASE);
+ }
MODIFY_REG(ADC3_COMMON->CCR, ADC_CCR_CKMODE_Msk,
0b11 << ADC_CCR_CKMODE_Pos);
} else if (chan >= 20){