diff --git a/Inc/PwmFlagchip.h b/Inc/PwmFlagchip.h
index d395c36..4d4b17f 100644
--- a/Inc/PwmFlagchip.h
+++ b/Inc/PwmFlagchip.h
@@ -20,15 +20,26 @@ typedef struct {
 } tPwmFlagchip;
 
 
+tPwmFlagchip PWM_Initial(
+        uint32_t PeriodTime,
+        uint32_t ActiveTime,
+        uint8_t TPU_PWM_CHANNEL,
+        uint8 TPU0_CH_PRIORITY,
+        TPU_EventCallbackType Bsp_Tpu_PwmCallback,
+        TPU_TCR1OverflowCallbackType Bsp_Tpu_OverflowCallBack);
+
 tPwmIO vPwmGetIo(tPwmFlagchip *env);
 
 // Частота шины
-#define BUS_CLK 120.0f
-// Делитель выходной частоты
-#define SCG_CLK_DIV 4.0f
-// Период такта
-// (1 / (BUS_CLK / SCG_CLK_DIV))
+#define BUS_CLK 120000000U
 
-#define NS_TO_TIME(NS) (NS / (1 / (BUS_CLK / SCG_CLK_DIV)))
+// Делитель выходной частоты
+#define SCG_CLK_DIV 4U
+
+#define TPU_FREQ (BUS_CLK / SCG_CLK_DIV)
+
+#define PWM_FREQ 25000 // 25 kHz
+
+#define PERIOD_TICKS (TPU_FREQ / PWM_FREQ)
 
 #endif //PWM_FLAGCHIP_H
diff --git a/Src/PwmFlagchip.c b/Src/PwmFlagchip.c
index 6c0e86d..1b06929 100644
--- a/Src/PwmFlagchip.c
+++ b/Src/PwmFlagchip.c
@@ -74,10 +74,21 @@ static void vPwmRun(tPwmFlagchip *env) {
     TPU_StartChannel();
 }
 
+static void setActivePercent(tPwmFlagchip *env, uint8_t percent) {
+
+    if (percent > 100)
+        percent = 100;
+
+    // Расчет времени активности в тактах
+    env->etpu_pwmconfig_tbl.u32ActiveTime = PERIOD_TICKS * percent / 100;
+}
+
+
 tPwmIO vPwmGetIo(tPwmFlagchip *env) {
     tPwmIO io = {
             .env = env,
             .run = (PwmIOTransaction) vPwmRun,
+            .setActivePercent = (PwmIOTransactionSetActivePercent) setActivePercent
     };
     return io;
 }
\ No newline at end of file