diff --git a/testhal/STM32F1xx/I2C/i2c_pns.c b/testhal/STM32F1xx/I2C/i2c_pns.c
index 96ac9a0bd..a64dab546 100644
--- a/testhal/STM32F1xx/I2C/i2c_pns.c
+++ b/testhal/STM32F1xx/I2C/i2c_pns.c
@@ -28,8 +28,8 @@
 /* I2C1 */
 static const I2CConfig i2cfg1 = {
     OPMODE_I2C,
-    360000,
-    FAST_DUTY_CYCLE_16_9,
+    400000,
+    FAST_DUTY_CYCLE_2,
 };
 
 
@@ -43,9 +43,9 @@ void I2CInit_pns(void){
   palSetPadMode(IOPORT2, 6, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
   palSetPadMode(IOPORT2, 7, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
 
-  /* startups. Pauses added just to be safe */
-  chThdSleepMilliseconds(100);
-  init_lis3();
+  chThdSleepMilliseconds(100);  /* Just to be safe. */
+
+  init_lis3();                  /* accelerometer init */
 }