diff --git a/fw/Core/Src/main.c b/fw/Core/Src/main.c
index eb2b3d4..6b9956c 100644
--- a/fw/Core/Src/main.c
+++ b/fw/Core/Src/main.c
@@ -137,8 +137,8 @@ int main(void)
   /* Infinite loop */
   /* USER CODE BEGIN WHILE */
   GPIO_PinState state = GPIO_PIN_RESET;
-  const uint32_t polarity_switch_period_ms = 1;
-  uint32_t next_polarity_switch_ms = HAL_GetTick() + polarity_switch_period_ms;
+  const uint32_t polarity_switch_period_iter = 10;
+  uint32_t next_polarity_switch_iter = polarity_switch_period_iter;
   bool polarity = true;
   while (1)
   {
@@ -162,9 +162,9 @@ int main(void)
     HAL_GPIO_WritePin(VDD_LEDL_EN_GPIO_Port, VDD_LEDL_EN_Pin, state);
 
     // Polarity switch (H-bridge control)
-    if (HAL_GetTick() > next_polarity_switch_ms)
+    if (--next_polarity_switch_iter == 0)
     {
-        next_polarity_switch_ms = HAL_GetTick() + polarity_switch_period_ms;
+        next_polarity_switch_iter = polarity_switch_period_iter;
         polarity = !polarity;
         H_bridge_set_direction(polarity);
     }