diff --git a/Core/Src/main.c b/Core/Src/main.c
index 5f49e19..05a9506 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -45,7 +45,8 @@ UART_HandleTypeDef huart1;
 UART_HandleTypeDef huart2;
 
 /* USER CODE BEGIN PV */
-
+static uint8_t rx_buf[16];
+static volatile uint8_t rx_complete = 0;
 /* USER CODE END PV */
 
 /* Private function prototypes -----------------------------------------------*/
@@ -95,26 +96,46 @@ int main(void)
   MX_USART1_UART_Init();
   MX_USART2_UART_Init();
   /* USER CODE BEGIN 2 */
-
+  /* Start UART2 reception in interrupt mode */
+  HAL_UART_Receive_IT(&huart2, rx_buf, sizeof(rx_buf));
   /* USER CODE END 2 */
 
   /* Infinite loop */
   /* USER CODE BEGIN WHILE */
 	while (1) {
-		HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
-		/* Heartbeat: emit tick timestamp over UART1 and blink the PB6 LED */
-		int msg_len = snprintf(heartbeat_buf, sizeof(heartbeat_buf),
-							   "PB6 heartbeat %lu\r\n", (unsigned long)HAL_GetTick());
-		if (msg_len > 0) {
-			if (msg_len >= (int)sizeof(heartbeat_buf)) {
-				msg_len = (int)sizeof(heartbeat_buf) - 1;
+		static uint32_t last_toggle_timestamp;
+		if (HAL_GetTick() - last_toggle_timestamp >= 1000) {
+			HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_6);
+			/* Heartbeat: emit tick timestamp over UART1 and blink the PB6 LED */
+			int msg_len = snprintf(heartbeat_buf, sizeof(heartbeat_buf),
+									"PB6 heartbeat %lu\r\n", (unsigned long)HAL_GetTick());
+			if (msg_len > 0) {
+				if (msg_len >= (int)sizeof(heartbeat_buf)) {
+					msg_len = (int)sizeof(heartbeat_buf) - 1;
+				}
+				HAL_UART_Transmit(&huart1, (uint8_t *)heartbeat_buf, (uint16_t)msg_len,
+									HAL_MAX_DELAY);
 			}
-			HAL_UART_Transmit(&huart1, (uint8_t *)heartbeat_buf, (uint16_t)msg_len,
-							  HAL_MAX_DELAY);
+			last_toggle_timestamp = HAL_GetTick();
+		}
+		
+		/* Check if data received from UART2 */
+		if (rx_complete) {
+			rx_complete = 0;
+			
+			/* Print received buffer as hex to UART1 */
+			char hex_buf[64];
+			int hex_len = snprintf(hex_buf, sizeof(hex_buf), "RX: ");
+			for (int i = 0; i < (int)sizeof(rx_buf) && hex_len < (int)sizeof(hex_buf) - 4; i++) {
+				hex_len += snprintf(hex_buf + hex_len, sizeof(hex_buf) - hex_len, "%02X ", rx_buf[i]);
+			}
+			hex_len += snprintf(hex_buf + hex_len, sizeof(hex_buf) - hex_len, "\r\n");
+			HAL_UART_Transmit(&huart1, (uint8_t *)hex_buf, (uint16_t)hex_len, HAL_MAX_DELAY);
+			
+			/* Re-arm UART2 reception */
+			HAL_UART_Receive_IT(&huart2, rx_buf, sizeof(rx_buf));
 		}
-		HAL_Delay(1000);
     /* USER CODE END WHILE */
-
     /* USER CODE BEGIN 3 */
 	}
   /* USER CODE END 3 */
@@ -275,6 +296,18 @@ static void MX_GPIO_Init(void)
 
 /* USER CODE BEGIN 4 */
 
+/**
+  * @brief  Rx Transfer completed callback
+  * @param  huart: UART handle
+  * @retval None
+  */
+void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
+{
+	if (huart->Instance == USART2) {
+		rx_complete = 1;
+	}
+}
+
 /* USER CODE END 4 */
 
 /**
diff --git a/Core/Src/stm32f4xx_hal_msp.c b/Core/Src/stm32f4xx_hal_msp.c
index 2d6c582..02343bb 100644
--- a/Core/Src/stm32f4xx_hal_msp.c
+++ b/Core/Src/stm32f4xx_hal_msp.c
@@ -108,6 +108,10 @@ void HAL_UART_MspInit(UART_HandleTypeDef* huart)
     GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
     HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
+    /* USART1 interrupt Init */
+    HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(USART1_IRQn);
+
     /* USER CODE BEGIN USART1_MspInit 1 */
 
     /* USER CODE END USART1_MspInit 1 */
@@ -132,6 +136,10 @@ void HAL_UART_MspInit(UART_HandleTypeDef* huart)
     GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
     HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
+    /* USART2 interrupt Init */
+    HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(USART2_IRQn);
+
     /* USER CODE BEGIN USART2_MspInit 1 */
 
     /* USER CODE END USART2_MspInit 1 */
@@ -161,6 +169,9 @@ void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
     */
     HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9|GPIO_PIN_10);
 
+    /* USART1 interrupt DeInit */
+    HAL_NVIC_DisableIRQ(USART1_IRQn);
+
     /* USER CODE BEGIN USART1_MspDeInit 1 */
 
     /* USER CODE END USART1_MspDeInit 1 */
@@ -179,6 +190,9 @@ void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
     */
     HAL_GPIO_DeInit(GPIOA, USART_TX_Pin|USART_RX_Pin);
 
+    /* USART2 interrupt DeInit */
+    HAL_NVIC_DisableIRQ(USART2_IRQn);
+
     /* USER CODE BEGIN USART2_MspDeInit 1 */
 
     /* USER CODE END USART2_MspDeInit 1 */
diff --git a/Core/Src/stm32f4xx_it.c b/Core/Src/stm32f4xx_it.c
index 5be1641..c024f77 100644
--- a/Core/Src/stm32f4xx_it.c
+++ b/Core/Src/stm32f4xx_it.c
@@ -55,7 +55,8 @@
 /* USER CODE END 0 */
 
 /* External variables --------------------------------------------------------*/
-
+extern UART_HandleTypeDef huart1;
+extern UART_HandleTypeDef huart2;
 /* USER CODE BEGIN EV */
 
 /* USER CODE END EV */
@@ -198,6 +199,34 @@ void SysTick_Handler(void)
 /* please refer to the startup file (startup_stm32f4xx.s).                    */
 /******************************************************************************/
 
+/**
+  * @brief This function handles USART1 global interrupt.
+  */
+void USART1_IRQHandler(void)
+{
+  /* USER CODE BEGIN USART1_IRQn 0 */
+
+  /* USER CODE END USART1_IRQn 0 */
+  HAL_UART_IRQHandler(&huart1);
+  /* USER CODE BEGIN USART1_IRQn 1 */
+
+  /* USER CODE END USART1_IRQn 1 */
+}
+
+/**
+  * @brief This function handles USART2 global interrupt.
+  */
+void USART2_IRQHandler(void)
+{
+  /* USER CODE BEGIN USART2_IRQn 0 */
+
+  /* USER CODE END USART2_IRQn 0 */
+  HAL_UART_IRQHandler(&huart2);
+  /* USER CODE BEGIN USART2_IRQn 1 */
+
+  /* USER CODE END USART2_IRQn 1 */
+}
+
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */
diff --git a/stmf411re_test.ioc b/stmf411re_test.ioc
index d265e65..a88b164 100644
--- a/stmf411re_test.ioc
+++ b/stmf411re_test.ioc
@@ -123,42 +123,44 @@ ProjectManager.UAScriptAfterPath=
 ProjectManager.UAScriptBeforePath=
 ProjectManager.UnderRoot=false
 ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_USART1_UART_Init-USART1-false-HAL-true,4-MX_USART2_UART_Init-USART2-false-HAL-true
-RCC.48MHZClocksFreq_Value=48000000
-RCC.AHBFreq_Value=48000000
+RCC.48MHZClocksFreq_Value=96000000
+RCC.AHBFreq_Value=96000000
+RCC.APB1CLKDivider=RCC_HCLK_DIV2
 RCC.APB1Freq_Value=48000000
-RCC.APB1TimFreq_Value=48000000
-RCC.APB2Freq_Value=48000000
-RCC.APB2TimFreq_Value=48000000
-RCC.CortexFreq_Value=48000000
-RCC.EthernetFreq_Value=48000000
-RCC.FCLKCortexFreq_Value=48000000
-RCC.FLatency-AdvancedSettings=FLASH_LATENCY_1
+RCC.APB1TimFreq_Value=96000000
+RCC.APB2Freq_Value=96000000
+RCC.APB2TimFreq_Value=96000000
+RCC.CortexFreq_Value=96000000
+RCC.EthernetFreq_Value=96000000
+RCC.FCLKCortexFreq_Value=96000000
+RCC.FLatency-AdvancedSettings=FLASH_LATENCY_3
 RCC.FamilyName=M
-RCC.HCLKFreq_Value=48000000
+RCC.HCLKFreq_Value=96000000
 RCC.HSE_VALUE=8000000
 RCC.HSI_VALUE=16000000
 RCC.I2SClocksFreq_Value=48000000
-RCC.IPParameters=48MHZClocksFreq_Value,AHBFreq_Value,APB1Freq_Value,APB1TimFreq_Value,APB2Freq_Value,APB2TimFreq_Value,CortexFreq_Value,EthernetFreq_Value,FCLKCortexFreq_Value,FLatency-AdvancedSettings,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI_VALUE,I2SClocksFreq_Value,LSE_VALUE,LSI_VALUE,MCO1PinFreq_Value,MCO2PinFreq_Value,PLLCLKFreq_Value,PLLM,PLLP,PLLQCLKFreq_Value,PLLSourceVirtual,PWR_Regulator_Voltage_Scale,RCC_MCO1Source,RCC_MCODiv1,RTCFreq_Value,RTCHSEDivFreq_Value,SYSCLKFreq_VALUE,SYSCLKSource,VCOI2SOutputFreq_Value,VCOInputFreq_Value,VCOInputMFreq_Value,VCOOutputFreq_Value,VcooutputI2S
+RCC.IPParameters=48MHZClocksFreq_Value,AHBFreq_Value,APB1CLKDivider,APB1Freq_Value,APB1TimFreq_Value,APB2Freq_Value,APB2TimFreq_Value,CortexFreq_Value,EthernetFreq_Value,FCLKCortexFreq_Value,FLatency-AdvancedSettings,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI_VALUE,I2SClocksFreq_Value,LSE_VALUE,LSI_VALUE,MCO1PinFreq_Value,MCO2PinFreq_Value,PLLCLKFreq_Value,PLLM,PLLN,PLLP,PLLQCLKFreq_Value,PLLSourceVirtual,PWR_Regulator_Voltage_Scale,RCC_MCO1Source,RCC_MCODiv1,RTCFreq_Value,RTCHSEDivFreq_Value,SYSCLKFreq_VALUE,SYSCLKSource,VCOI2SOutputFreq_Value,VCOInputFreq_Value,VCOInputMFreq_Value,VCOOutputFreq_Value,VcooutputI2S
 RCC.LSE_VALUE=32768
 RCC.LSI_VALUE=32000
-RCC.MCO1PinFreq_Value=24000000
-RCC.MCO2PinFreq_Value=48000000
-RCC.PLLCLKFreq_Value=48000000
+RCC.MCO1PinFreq_Value=48000000
+RCC.MCO2PinFreq_Value=96000000
+RCC.PLLCLKFreq_Value=96000000
 RCC.PLLM=8
+RCC.PLLN=384
 RCC.PLLP=RCC_PLLP_DIV4
-RCC.PLLQCLKFreq_Value=48000000
+RCC.PLLQCLKFreq_Value=96000000
 RCC.PLLSourceVirtual=RCC_PLLSOURCE_HSE
-RCC.PWR_Regulator_Voltage_Scale=PWR_REGULATOR_VOLTAGE_SCALE2
+RCC.PWR_Regulator_Voltage_Scale=PWR_REGULATOR_VOLTAGE_SCALE1
 RCC.RCC_MCO1Source=RCC_MCO1SOURCE_PLLCLK
 RCC.RCC_MCODiv1=RCC_MCODIV_2
 RCC.RTCFreq_Value=32000
 RCC.RTCHSEDivFreq_Value=4000000
-RCC.SYSCLKFreq_VALUE=48000000
+RCC.SYSCLKFreq_VALUE=96000000
 RCC.SYSCLKSource=RCC_SYSCLKSOURCE_PLLCLK
 RCC.VCOI2SOutputFreq_Value=96000000
 RCC.VCOInputFreq_Value=1000000
 RCC.VCOInputMFreq_Value=500000
-RCC.VCOOutputFreq_Value=192000000
+RCC.VCOOutputFreq_Value=384000000
 RCC.VcooutputI2S=48000000
 USART1.IPParameters=VirtualMode
 USART1.VirtualMode=VM_ASYNC