2 files changed, 6 insertions, 7 deletions

diff --git a/embassy-stm32/src/adc/v1.rs b/embassy-stm32/src/adc/v1.rs
index 83bf5aece..37115dfab 100644
--- a/embassy-stm32/src/adc/v1.rs
+++ b/embassy-stm32/src/adc/v1.rs
@@ -76,6 +76,10 @@ impl<'d, T: Instance> Adc<'d, T> {
         // tstab = 14 * 1/fadc
         delay.delay_us(1);
 
+        // set default PCKL/2 on L0s because HSI is disabled in the default clock config
+        #[cfg(adc_l0)]
+        T::regs().cfgr2().modify(|reg| reg.set_ckmode(Ckmode::PCLK_DIV2));
+
         // A.7.1 ADC calibration code example
         T::regs().cfgr1().modify(|reg| reg.set_dmaen(false));
         T::regs().cr().modify(|reg| reg.set_adcal(true));
diff --git a/examples/stm32l0/src/bin/adc.rs b/examples/stm32l0/src/bin/adc.rs
index eee69211c..adeaa208a 100644
--- a/examples/stm32l0/src/bin/adc.rs
+++ b/examples/stm32l0/src/bin/adc.rs
@@ -5,7 +5,7 @@ use defmt::*;
 use embassy_executor::Spawner;
 use embassy_stm32::adc::{Adc, SampleTime};
 use embassy_stm32::peripherals::ADC;
-use embassy_stm32::{adc, bind_interrupts, Config};
+use embassy_stm32::{adc, bind_interrupts};
 use embassy_time::{Delay, Timer};
 use {defmt_rtt as _, panic_probe as _};
 
@@ -15,12 +15,7 @@ bind_interrupts!(struct Irqs {
 
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
-    // enable HSI because default is MSI but ADC doesn't support
-    // this as clock source on L0s and uses HSI by default
-    let mut config = Config::default();
-    config.rcc.hsi = true;
-    let p = embassy_stm32::init(config);
-
+    let p = embassy_stm32::init(Default::default());
     info!("Hello World!");
 
     let mut adc = Adc::new(p.ADC, Irqs, &mut Delay);