5 files changed, 55 insertions, 2 deletions
diff --git a/project/Core/Inc/Devices/UART.h b/project/Core/Inc/Devices/UART.h
index e9c0f33..03476f6 100644
--- a/project/Core/Inc/Devices/UART.h
+++ b/project/Core/Inc/Devices/UART.h
@@ -11,7 +11,8 @@ void USART1_IRQHandler(void);
 void USART2_IRQHandler(void);
 void USART_Init(USART_TypeDef * USARTx);
 void USART_Write(USART_TypeDef * USARTx, uint8_t *buffer, uint32_t nBytes);
-uint8_t   USART_Read(USART_TypeDef * USARTx);
+uint8_t USART_Read(USART_TypeDef * USARTx);
+uint8_t USART_Read_Nonblocking (USART_TypeDef * USARTx);
 void USART_Delay(uint32_t us);
 void USART_IRQHandler(USART_TypeDef * USARTx, uint8_t *buffer, uint32_t * pRx_counter);
 
diff --git a/project/Core/Inc/Homework/hw4.h b/project/Core/Inc/Homework/hw4.h
new file mode 100644
index 0000000..2aa852e
--- /dev/null
+++ b/project/Core/Inc/Homework/hw4.h
@@ -0,0 +1,13 @@
+/*
+ * hw4.h
+ *
+ *  Created on: Oct 4, 2025
+ *      Author: sowgro
+ */
+
+#ifndef INC_HOMEWORK_HW4_H_
+#define INC_HOMEWORK_HW4_H_
+
+void hw4_run();
+
+#endif /* INC_HOMEWORK_HW4_H_ */
diff --git a/project/Core/Src/Devices/UART.c b/project/Core/Src/Devices/UART.c
index b1eb30c..7c11e30 100644
--- a/project/Core/Src/Devices/UART.c
+++ b/project/Core/Src/Devices/UART.c
@@ -108,6 +108,13 @@ uint8_t USART_Read (USART_TypeDef * USARTx) {
 	// Reading USART_DR automatically clears the RXNE flag 
 }
 
+uint8_t USART_Read_Nonblocking (USART_TypeDef * USARTx) {
+	if (!(USARTx->ISR & USART_ISR_RXNE))
+		return 0;
+
+	return ((uint8_t)(USARTx->RDR & 0xFF));
+}
+
 void USART_Write(USART_TypeDef * USARTx, uint8_t *buffer, uint32_t nBytes) {
 	int i;
 	// TXE is cleared by a write to the USART_DR register.
diff --git a/project/Core/Src/Homework/hw4.c b/project/Core/Src/Homework/hw4.c
new file mode 100644
index 0000000..2154cd4
--- /dev/null
+++ b/project/Core/Src/Homework/hw4.c
@@ -0,0 +1,29 @@
+/*
+ * hw4.c
+ *
+ *  Created on: Oct 4, 2025
+ *      Author: sowgro
+ */
+
+#include "UART.h"
+#include "systick.h"
+#include "LED.h"
+#include <stdio.h>
+
+
+void read_and_print_char_nonblocking() {
+	uint8_t ch = USART_Read_Nonblocking(USART2);
+	printf("%c", ch);
+	if (ch == '\r') {
+		printf("\n");
+	}
+}
+
+void hw4_run() {
+	init_systick();
+	for (;;) {
+		delay_systick();
+		LED_Toggle();
+		read_and_print_char_nonblocking();
+	}
+}
diff --git a/project/Core/Src/main.c b/project/Core/Src/main.c
index 4063064..b95d7e3 100644
--- a/project/Core/Src/main.c
+++ b/project/Core/Src/main.c
@@ -8,7 +8,9 @@
 #include "LED.h"
 #include "UART.h"
 #include "demo.h"
+#include "activity7.h"
 #include <stdio.h>
+#include "hw4.h"
 
 int main(void){
 
@@ -17,8 +19,9 @@ int main(void){
 	LED_Init();
 	UART2_Init();
 	
+	hw4_run();
 	// application run function
 //	run_demo();
-	activity7_run();
+//	activity7_run();
 }