diff --git a/Core/Inc/tim.h b/Core/Inc/tim.h
index 46c0a2a..10d4966 100644
--- a/Core/Inc/tim.h
+++ b/Core/Inc/tim.h
@@ -34,11 +34,16 @@ extern "C" {
 
 extern TIM_HandleTypeDef htim3;
 
+extern TIM_HandleTypeDef htim4;
+
 /* USER CODE BEGIN Private defines */
 
 /* USER CODE END Private defines */
 
 void MX_TIM3_Init(void);
+void MX_TIM4_Init(void);
+
+void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);
 
 /* USER CODE BEGIN Prototypes */
 
diff --git a/Core/Src/main.c b/Core/Src/main.c
index fd129ba..4a315b4 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -93,6 +93,7 @@ int main(void)
   MX_SPI3_Init();
   MX_USART2_UART_Init();
   MX_TIM3_Init();
+  MX_TIM4_Init();
   /* USER CODE BEGIN 2 */
 	setup();
   /* USER CODE END 2 */
@@ -149,7 +150,7 @@ void SystemClock_Config(void)
   }
   PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2|RCC_PERIPHCLK_TIM34;
   PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
-  PeriphClkInit.Tim34ClockSelection = RCC_TIM34CLK_HCLK;
+  PeriphClkInit.Tim34ClockSelection = RCC_TIM34CLK_PLLCLK;
   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
   {
     Error_Handler();
diff --git a/Core/Src/tim.c b/Core/Src/tim.c
index 865b097..43571c3 100644
--- a/Core/Src/tim.c
+++ b/Core/Src/tim.c
@@ -25,6 +25,7 @@
 /* USER CODE END 0 */
 
 TIM_HandleTypeDef htim3;
+TIM_HandleTypeDef htim4;
 
 /* TIM3 init function */
 void MX_TIM3_Init(void)
@@ -69,6 +70,50 @@ void MX_TIM3_Init(void)
 
   /* USER CODE END TIM3_Init 2 */
 
+}
+/* TIM4 init function */
+void MX_TIM4_Init(void)
+{
+
+  /* USER CODE BEGIN TIM4_Init 0 */
+
+  /* USER CODE END TIM4_Init 0 */
+
+  TIM_MasterConfigTypeDef sMasterConfig = {0};
+  TIM_OC_InitTypeDef sConfigOC = {0};
+
+  /* USER CODE BEGIN TIM4_Init 1 */
+
+  /* USER CODE END TIM4_Init 1 */
+  htim4.Instance = TIM4;
+  htim4.Init.Prescaler = 0;
+  htim4.Init.CounterMode = TIM_COUNTERMODE_UP;
+  htim4.Init.Period = 1023;
+  htim4.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
+  htim4.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
+  if (HAL_TIM_PWM_Init(&htim4) != HAL_OK)
+  {
+    Error_Handler();
+  }
+  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
+  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
+  if (HAL_TIMEx_MasterConfigSynchronization(&htim4, &sMasterConfig) != HAL_OK)
+  {
+    Error_Handler();
+  }
+  sConfigOC.OCMode = TIM_OCMODE_PWM1;
+  sConfigOC.Pulse = 511;
+  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
+  sConfigOC.OCFastMode = TIM_OCFAST_ENABLE;
+  if (HAL_TIM_PWM_ConfigChannel(&htim4, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
+  {
+    Error_Handler();
+  }
+  /* USER CODE BEGIN TIM4_Init 2 */
+
+  /* USER CODE END TIM4_Init 2 */
+  HAL_TIM_MspPostInit(&htim4);
+
 }
 
 void HAL_TIM_Encoder_MspInit(TIM_HandleTypeDef* tim_encoderHandle)
@@ -101,6 +146,51 @@ void HAL_TIM_Encoder_MspInit(TIM_HandleTypeDef* tim_encoderHandle)
   }
 }
 
+void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef* tim_pwmHandle)
+{
+
+  if(tim_pwmHandle->Instance==TIM4)
+  {
+  /* USER CODE BEGIN TIM4_MspInit 0 */
+
+  /* USER CODE END TIM4_MspInit 0 */
+    /* TIM4 clock enable */
+    __HAL_RCC_TIM4_CLK_ENABLE();
+  /* USER CODE BEGIN TIM4_MspInit 1 */
+
+  /* USER CODE END TIM4_MspInit 1 */
+  }
+}
+void HAL_TIM_MspPostInit(TIM_HandleTypeDef* timHandle)
+{
+
+  GPIO_InitTypeDef GPIO_InitStruct = {0};
+  if(timHandle->Instance==TIM4)
+  {
+  /* USER CODE BEGIN TIM4_MspPostInit 0 */
+
+  /* USER CODE END TIM4_MspPostInit 0 */
+
+    __HAL_RCC_GPIOB_CLK_ENABLE();
+    /**TIM4 GPIO Configuration
+    PB6     ------> TIM4_CH1
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_6;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF2_TIM4;
+    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+    HAL_I2CEx_EnableFastModePlus(SYSCFG_CFGR1_I2C_PB6_FMP);
+
+  /* USER CODE BEGIN TIM4_MspPostInit 1 */
+
+  /* USER CODE END TIM4_MspPostInit 1 */
+  }
+
+}
+
 void HAL_TIM_Encoder_MspDeInit(TIM_HandleTypeDef* tim_encoderHandle)
 {
 
@@ -124,6 +214,22 @@ void HAL_TIM_Encoder_MspDeInit(TIM_HandleTypeDef* tim_encoderHandle)
   }
 }
 
+void HAL_TIM_PWM_MspDeInit(TIM_HandleTypeDef* tim_pwmHandle)
+{
+
+  if(tim_pwmHandle->Instance==TIM4)
+  {
+  /* USER CODE BEGIN TIM4_MspDeInit 0 */
+
+  /* USER CODE END TIM4_MspDeInit 0 */
+    /* Peripheral clock disable */
+    __HAL_RCC_TIM4_CLK_DISABLE();
+  /* USER CODE BEGIN TIM4_MspDeInit 1 */
+
+  /* USER CODE END TIM4_MspDeInit 1 */
+  }
+}
+
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */
diff --git a/Makefile b/Makefile
index 8406338..cd15e2a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 ##########################################################################################################################
-# File automatically-generated by tool: [projectgenerator] version: [3.17.1] date: [Sat Sep 30 08:45:04 CEST 2023] 
+# File automatically-generated by tool: [projectgenerator] version: [3.17.1] date: [Sat Oct 14 13:34:44 CEST 2023] 
 ##########################################################################################################################
 
 # ------------------------------------------------
diff --git a/app/core/app.c b/app/core/app.c
index 54d1cd1..262fc7c 100644
--- a/app/core/app.c
+++ b/app/core/app.c
@@ -13,6 +13,7 @@
 
 #define MAX_VOLT 330
 #define MAX_REF 256
+#define MAX_PWM_VOLT 150
 
 typedef enum
 {
@@ -23,7 +24,8 @@ typedef enum
 	POT,
 	REF,
 	OFFS,
-	ZERO,
+	// ZERO,
+	PWM,
 	OPT_MAX
 } option_t;
 
@@ -62,6 +64,7 @@ void setup(void)
 	var[POT] = 255;
 	var[REF] = 197;
 	var[ONOFF] = 1;
+	var[REF] = 511;
 
 	hst7565.hspi = &hspi3;
 	hst7565.cs_port = ST7565_CS_GPIO_Port;
@@ -131,6 +134,8 @@ void draw_string(void)
 	DISP_writeString(&disp, &font5x7Info, (uint8_t *)"OFFS:", 8, 48, BM_NORMAL);
 	// dac2 - zeroing
 	DISP_writeString(&disp, &font5x7Info, (uint8_t *)"ZERO:", 8, 56, BM_NORMAL);
+	// pwm
+	DISP_writeString(&disp, &font5x7Info, (uint8_t *)"PWM:", 72, 0, BM_NORMAL);
 
 	for (option_t opt = FREQ; opt < OPT_MAX; opt++)
 	{
@@ -186,8 +191,15 @@ void update_display(void)
 		DISP_writeString(&disp, &font5x7Info, data, 48, 48, BM_NORMAL);
 		DISP_writeString(&disp, &font5x7Info, (uint8_t *)"*", 0, 48, BM_NORMAL);
 		break;
-	case ZERO:
-		temp = (MAX_REF * var[REF] + 127) / UINT8_MAX;
+	// case ZERO:
+	// 	temp = (MAX_REF * var[REF] + 127) / UINT8_MAX;
+	// 	snprintf((char *)data, 16, "%03u (%01d.%02d)", var[REF], temp / 100, temp % 100);
+	// 	// snprintf((char *)data, 8, "%03u", var[ZERO]);
+	// 	DISP_writeString(&disp, &font5x7Info, data, 48, 56, BM_NORMAL);
+	// 	DISP_writeString(&disp, &font5x7Info, (uint8_t *)"*", 0, 56, BM_NORMAL);
+	// 	break;
+	case PWM:
+		temp = (MAX_PWM_VOLT * var[REF] + 512) / 1024;
 		snprintf((char *)data, 16, "%03u (%01d.%02d)", var[REF], temp / 100, temp % 100);
 		// snprintf((char *)data, 8, "%03u", var[ZERO]);
 		DISP_writeString(&disp, &font5x7Info, data, 48, 56, BM_NORMAL);
@@ -324,10 +336,16 @@ void changeValue(int8_t inc)
 		ad5303_set_value(&hdac, var[OFFS], AD_DAC2);
 		break;
 	}
-	case ZERO:
+	// case ZERO:
+	// {
+	// 	var[ZERO] = (var[ZERO] + inc) & UINT8_MAX;
+	// 	ad5303_set_value(&hdac, var[ZERO], AD_DAC1);
+	// 	break;
+	// }
+	case PWM:
 	{
-		var[ZERO] = (var[ZERO] + inc) & UINT8_MAX;
-		ad5303_set_value(&hdac, var[ZERO], AD_DAC1);
+		var[PWM] = (var[PWM] + inc) & 0x03FF; // 0x03FF - 1023
+		__HAL_TIM_SET_COMPARE(&htim4, TIM_CHANNEL_1, var[PWM]);
 		break;
 	}
 	default:
diff --git a/fun_gen_amp_test.ioc b/fun_gen_amp_test.ioc
index 578ffc9..e5f4b37 100644
--- a/fun_gen_amp_test.ioc
+++ b/fun_gen_amp_test.ioc
@@ -10,8 +10,9 @@ Mcu.IP3=SPI2
 Mcu.IP4=SPI3
 Mcu.IP5=SYS
 Mcu.IP6=TIM3
-Mcu.IP7=USART2
-Mcu.IPNb=8
+Mcu.IP7=TIM4
+Mcu.IP8=USART2
+Mcu.IPNb=9
 Mcu.Name=STM32F303R(D-E)Tx
 Mcu.Package=LQFP64
 Mcu.Pin0=PC13
@@ -36,16 +37,17 @@ Mcu.Pin25=PC10
 Mcu.Pin26=PC11
 Mcu.Pin27=PC12
 Mcu.Pin28=PB3
-Mcu.Pin29=PB9
+Mcu.Pin29=PB6
 Mcu.Pin3=PF0-OSC_IN
-Mcu.Pin30=VP_SYS_VS_Systick
+Mcu.Pin30=PB9
+Mcu.Pin31=VP_SYS_VS_Systick
 Mcu.Pin4=PF1-OSC_OUT
 Mcu.Pin5=PA0
 Mcu.Pin6=PA1
 Mcu.Pin7=PA2
 Mcu.Pin8=PA3
 Mcu.Pin9=PA4
-Mcu.PinsNb=31
+Mcu.PinsNb=32
 Mcu.ThirdPartyNb=0
 Mcu.UserConstants=
 Mcu.UserName=STM32F303RETx
@@ -136,6 +138,11 @@ PB3.GPIOParameters=GPIO_Label
 PB3.GPIO_Label=SWO
 PB3.Locked=true
 PB3.Signal=SYS_JTDO-TRACESWO
+PB6.GPIOParameters=GPIO_Speed,GPIO_FM6
+PB6.GPIO_FM6=SYSCFG_CFGR1_I2C_PB6_FMP
+PB6.GPIO_Speed=GPIO_SPEED_FREQ_HIGH
+PB6.Locked=true
+PB6.Signal=S_TIM4_CH1
 PB9.GPIOParameters=GPIO_Label
 PB9.GPIO_Label=GAIN1
 PB9.Locked=true
@@ -223,7 +230,7 @@ RCC.I2C1Freq_Value=8000000
 RCC.I2C2Freq_Value=8000000
 RCC.I2C3Freq_Value=8000000
 RCC.I2SClocksFreq_Value=48000000
-RCC.IPParameters=ADC12outputFreq_Value,ADC34outputFreq_Value,AHBFreq_Value,APB1CLKDivider,APB1Freq_Value,APB1TimFreq_Value,APB2Freq_Value,APB2TimFreq_Value,CortexFreq_Value,FCLKCortexFreq_Value,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI_VALUE,I2C1Freq_Value,I2C2Freq_Value,I2C3Freq_Value,I2SClocksFreq_Value,LSI_VALUE,MCOFreq_Value,PLLCLKFreq_Value,PLLM,PLLMCOFreq_Value,PLLMUL,PLLN,PLLP,PLLQ,PLLSourceVirtual,RCC_MCODiv,RCC_PLLsource_Clock_Source_FROM_HSE,RTCFreq_Value,RTCHSEDivFreq_Value,SYSCLKFreq_VALUE,SYSCLKSourceVirtual,TIM15Freq_Value,TIM16Freq_Value,TIM17Freq_Value,TIM1Freq_Value,TIM20Freq_Value,TIM2Freq_Value,TIM3Freq_Value,TIM8Freq_Value,UART4Freq_Value,UART5Freq_Value,USART1Freq_Value,USART2Freq_Value,USART3Freq_Value,USBFreq_Value,VCOOutput2Freq_Value
+RCC.IPParameters=ADC12outputFreq_Value,ADC34outputFreq_Value,AHBFreq_Value,APB1CLKDivider,APB1Freq_Value,APB1TimFreq_Value,APB2Freq_Value,APB2TimFreq_Value,CortexFreq_Value,FCLKCortexFreq_Value,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI_VALUE,I2C1Freq_Value,I2C2Freq_Value,I2C3Freq_Value,I2SClocksFreq_Value,LSI_VALUE,MCOFreq_Value,PLLCLKFreq_Value,PLLM,PLLMCOFreq_Value,PLLMUL,PLLN,PLLP,PLLQ,PLLSourceVirtual,RCC_MCODiv,RCC_PLLsource_Clock_Source_FROM_HSE,RTCFreq_Value,RTCHSEDivFreq_Value,SYSCLKFreq_VALUE,SYSCLKSourceVirtual,TIM15Freq_Value,TIM16Freq_Value,TIM17Freq_Value,TIM1Freq_Value,TIM20Freq_Value,TIM2Freq_Value,TIM34Selection,TIM3Freq_Value,TIM8Freq_Value,UART4Freq_Value,UART5Freq_Value,USART1Freq_Value,USART2Freq_Value,USART3Freq_Value,USBFreq_Value,VCOOutput2Freq_Value
 RCC.LSI_VALUE=40000
 RCC.MCOFreq_Value=24000000
 RCC.PLLCLKFreq_Value=48000000
@@ -246,7 +253,8 @@ RCC.TIM17Freq_Value=48000000
 RCC.TIM1Freq_Value=48000000
 RCC.TIM20Freq_Value=72000000
 RCC.TIM2Freq_Value=48000000
-RCC.TIM3Freq_Value=48000000
+RCC.TIM34Selection=RCC_TIM34CLK_PLLCLK
+RCC.TIM3Freq_Value=96000000
 RCC.TIM8Freq_Value=48000000
 RCC.UART4Freq_Value=24000000
 RCC.UART5Freq_Value=24000000
@@ -263,6 +271,8 @@ SH.S_TIM3_CH1.0=TIM3_CH1,Encoder_Interface
 SH.S_TIM3_CH1.ConfNb=1
 SH.S_TIM3_CH2.0=TIM3_CH2,Encoder_Interface
 SH.S_TIM3_CH2.ConfNb=1
+SH.S_TIM4_CH1.0=TIM4_CH1,PWM Generation1 CH1
+SH.S_TIM4_CH1.ConfNb=1
 SPI2.BaudRatePrescaler=SPI_BAUDRATEPRESCALER_32
 SPI2.CLKPolarity=SPI_POLARITY_HIGH
 SPI2.CalculateBaudRate=750.0 KBits/s
@@ -283,6 +293,11 @@ TIM3.IC1Filter=15
 TIM3.IC2Filter=15
 TIM3.IPParameters=Period,IC1Filter,IC2Filter
 TIM3.Period=255
+TIM4.Channel-PWM\ Generation1\ CH1=TIM_CHANNEL_1
+TIM4.IPParameters=Channel-PWM Generation1 CH1,Period,Pulse-PWM Generation1 CH1,OCFastMode_PWM-PWM Generation1 CH1
+TIM4.OCFastMode_PWM-PWM\ Generation1\ CH1=TIM_OCFAST_ENABLE
+TIM4.Period=1023
+TIM4.Pulse-PWM\ Generation1\ CH1=511
 USART2.IPParameters=VirtualMode-Asynchronous
 USART2.VirtualMode-Asynchronous=VM_ASYNC
 VP_SYS_VS_Systick.Mode=SysTick