diff --git a/boards/lora_e5_mini/src/main.rs b/boards/lora_e5_mini/src/main.rs
index 26f1e7cc28..70e42e38b6 100644
--- a/boards/lora_e5_mini/src/main.rs
+++ b/boards/lora_e5_mini/src/main.rs
@@ -415,12 +415,16 @@ pub unsafe fn main() {
 
     // SCL
     gpio_ports.get_pin(PinId::PB15).map(|pin| {
+        pin.set_mode_output_opendrain();
         pin.set_mode(stm32wle5jc::gpio::Mode::AlternateFunctionMode);
         pin.set_floating_state(kernel::hil::gpio::FloatingState::PullNone);
         pin.set_alternate_function(stm32wle5jc::gpio::AlternateFunction::AF4);
     });
 
     base_peripherals.i2c2.enable_clock();
+    base_peripherals
+        .i2c2
+        .set_speed(stm32wle5jc::i2c::I2CSpeed::Speed400k);
     let i2c_master = components::i2c::I2CMasterDriverComponent::new(
         board_kernel,
         capsules_core::i2c_master::DRIVER_NUM,
diff --git a/chips/stm32wle5xx/src/i2c.rs b/chips/stm32wle5xx/src/i2c.rs
index 4373fcc665..0c6070c96d 100644
--- a/chips/stm32wle5xx/src/i2c.rs
+++ b/chips/stm32wle5xx/src/i2c.rs
@@ -326,10 +326,13 @@ impl<'a> I2C<'a> {
 
         match speed {
             I2CSpeed::Speed100k => {
-                self.registers.timingr.set(0x00303D5B);
+                self.registers.timingr.set(0xE14);
+
+                //self.registers.timingr.set(0x00303D5B);
             }
             I2CSpeed::Speed400k => {
-                self.registers.timingr.set(0x0010061A);
+                self.registers.timingr.set(0x4);
+                //self.registers.timingr.set(0x0010061A);
             }
         }