diff --git a/src/inverterCtrl.c b/src/inverterCtrl.c
index 9083294..3b1f18c 100644
--- a/src/inverterCtrl.c
+++ b/src/inverterCtrl.c
@@ -15,11 +15,11 @@
 #include <isr_compat.h>
 
 
-#define NUM_OF_SINE_VALUES 30
+#define NUM_OF_SINE_VALUES 21
 
 
 volatile uint8_t pulseWidthIdx = 0;
-volatile bool direction = true;
+volatile bool direction = false;
 
 
 ISR(TIMER1_A0, TA1_ISR_Ovrfl) {
@@ -79,7 +79,7 @@ void inverterCtrlInit() {
 
 void inverterCtrlSetFrequency(uint16_t f) {
 	float ff = (float)f;
-	float slotLength = 2 / (ff * 400e-9 * NUM_OF_SINE_VALUES);
+	float slotLength = 4 / (ff * 400e-9 * NUM_OF_SINE_VALUES);
 	uint16_t sl = (uint16_t)slotLength;
 
 	__disable_interrupt();