diff --git a/source/firmware/arch/stm32f4xx/board/stm32f4-discovery/include/stm32f4-discovery.h b/source/firmware/arch/stm32f4xx/board/stm32f4-discovery/include/stm32f4-discovery.h
index e6a7408..d70a788 100755
--- a/source/firmware/arch/stm32f4xx/board/stm32f4-discovery/include/stm32f4-discovery.h
+++ b/source/firmware/arch/stm32f4xx/board/stm32f4-discovery/include/stm32f4-discovery.h
@@ -59,7 +59,7 @@ static const TIM_OCInitTypeDef t4_output_compare_cfg = {
 		.TIM_OCMode = TIM_OCMode_PWM1,
 		.TIM_OCPolarity = TIM_OCPolarity_High,
 		.TIM_OutputState = TIM_OutputState_Enable,
-		.TIM_Pulse = 0 // Initiale Pulsweite in Millisekunden
+		.TIM_Pulse = 0,
 };
 
 static const GPIO_InitTypeDef port_cfg = {
@@ -85,6 +85,15 @@ static const struct pwm pwm_ch4 = {
 		.fp = &stm32f4_pwm_fp,
 };
 
+#ifdef TEST_APP
+static const struct driver pwm_4 = {
+#else
+const struct driver pwm_4 = {
+#endif
+		DRIVER_TYPE_PWM,
+		&pwm_ch4,
+};
+
 // UART 1
 static char console_linear_buffer[80];
 static struct ringbuffer console_buffer = {
diff --git a/source/firmware/kernel/driver/driver.c b/source/firmware/kernel/driver/driver.c
index 06b4747..654c647 100644
--- a/source/firmware/kernel/driver/driver.c
+++ b/source/firmware/kernel/driver/driver.c
@@ -11,6 +11,7 @@
 #include "adc.h"
 #include "gpio.h"
 #include "i2c.h"
+#include "pwm.h"
 #include "rtc.h"
 #include "spi.h"
 #include "uart.h"
@@ -30,6 +31,9 @@ int open(const struct driver *driver)
 	case DRIVER_TYPE_I2C:
 		ret = i2c_open((struct i2c *)(driver->device_driver));
 		break;
+	case DRIVER_TYPE_PWM:
+		ret = pwm_open((const struct pwm *)(driver->device_driver));
+		break;
 	case DRIVER_TYPE_RTC:
 		ret = rtc_open((const struct rtc *)(driver->device_driver));
 		break;
@@ -58,6 +62,9 @@ int close(const struct driver *driver)
 	case DRIVER_TYPE_I2C:
 		ret = i2c_close((struct i2c *)(driver->device_driver));
 		break;
+	case DRIVER_TYPE_PWM:
+		ret = pwm_close((const struct pwm *)(driver->device_driver));
+		break;
 	case DRIVER_TYPE_RTC:
 		ret = rtc_close((const struct rtc *)(driver->device_driver));
 		break;
@@ -88,6 +95,9 @@ int read(const struct driver *driver, char *buffer, int len)
 		break;
 	case DRIVER_TYPE_I2C:
 		break;
+	case DRIVER_TYPE_PWM:
+		ret = -1;
+		break;
 	case DRIVER_TYPE_RTC:
 		break;
 	case DRIVER_TYPE_SPI:
@@ -118,6 +128,9 @@ int write(const struct driver *driver, const char *buffer, int len)
 		break;
 	case DRIVER_TYPE_I2C:
 		break;
+	case DRIVER_TYPE_PWM:
+		ret = -1;
+		break;
 	case DRIVER_TYPE_RTC:
 		break;
 	case DRIVER_TYPE_SPI:
@@ -128,3 +141,31 @@ int write(const struct driver *driver, const char *buffer, int len)
 	}
 	return ret;
 }
+
+int ioctl(const struct driver *driver, unsigned int cmd, const void *data)
+{
+	int ret = -1;
+	if(NULL == driver)
+		return ret;
+	switch(driver->driver_type) {
+	case DRIVER_TYPE_ADC:
+		break;
+	case DRIVER_TYPE_GPIO:
+		break;
+	case DRIVER_TYPE_I2C:
+		break;
+	case DRIVER_TYPE_PWM:
+		if(cmd == IOCTL_PWM_SET_DUTY_CYCLE) {
+			unsigned int *duty = (unsigned int *)data;
+			pwm_set_duty_cycle((const struct pwm *)(driver->device_driver), *duty);
+		}
+		break;
+	case DRIVER_TYPE_RTC:
+		break;
+	case DRIVER_TYPE_SPI:
+		break;
+	case DRIVER_TYPE_UART:
+		break;
+	}
+	return ret;
+}
diff --git a/source/firmware/kernel/interface/driver.h b/source/firmware/kernel/interface/driver.h
index ee82abf..14923d9 100644
--- a/source/firmware/kernel/interface/driver.h
+++ b/source/firmware/kernel/interface/driver.h
@@ -8,10 +8,13 @@
 #ifndef SOURCE_FIRMWARE_KERNEL_DRIVER_INCLUDE_DRIVER_H_
 #define SOURCE_FIRMWARE_KERNEL_DRIVER_INCLUDE_DRIVER_H_
 
+#define IOCTL_PWM_SET_DUTY_CYCLE	0
+
 enum driver_type {
 	DRIVER_TYPE_ADC,
 	DRIVER_TYPE_GPIO,
 	DRIVER_TYPE_I2C,
+	DRIVER_TYPE_PWM,
 	DRIVER_TYPE_RTC,
 	DRIVER_TYPE_SPI,
 	DRIVER_TYPE_UART
@@ -26,5 +29,6 @@ int open(const struct driver *driver);
 int close(const struct driver *driver);
 int read(const struct driver *driver, char *buffer, int len);
 int write(const struct driver *driver, const char *buffer, int len);
+int ioctl(const struct driver *driver, unsigned int cmd, const void *data);
 
 #endif /* SOURCE_FIRMWARE_KERNEL_DRIVER_INCLUDE_DRIVER_H_ */
diff --git a/source/test/pwm/main.c b/source/test/pwm/main.c
index f0aa726..e8b0418 100644
--- a/source/test/pwm/main.c
+++ b/source/test/pwm/main.c
@@ -23,15 +23,16 @@ struct thread_context th_ctx;
 static void th_func(void *arg)
 {
 	unsigned int duty = 0;
-	pwm_open(&pwm_ch4);
+	open(&pwm_4);
 	while(1) {
 		while(duty < 100) {
+			ioctl(&pwm_4, IOCTL_PWM_SET_DUTY_CYCLE, (const void *)&duty);
 			pwm_set_duty_cycle(&pwm_ch4, duty);
 			sleep_ms(10);
 			duty++;
 		}
 		while(duty > 0) {
-			pwm_set_duty_cycle(&pwm_ch4, duty);
+			ioctl(&pwm_4, IOCTL_PWM_SET_DUTY_CYCLE, (const void *)&duty);
 			sleep_ms(10);
 			duty--;
 		}