Test serial data transmission on atmega32a

src/main.c

@@ -1,6 +1,51 @@
-#define UNUSED(s) (void)(s)
+#include <avr/io.h>
+#include <util/delay.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
+
+void UART_Init(long USART_BAUDRATE)
+{
+	UCSRB |= (1 << RXEN) | (1 << TXEN);
+	UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1);
+	UBRRL = BAUD_PRESCALE;
+	UBRRH = (BAUD_PRESCALE >> 8);
+}
+
+unsigned char UART_RxChar()
+{
+	while ((UCSRA & (1 << RXC)) == 0);
+	return UDR;
+}
+
+void UART_TxChar(char ch)
+{
+	while ((UCSRA & (1 << UDRE)) == 0);
+	UDR = ch;
+}
+
+void UART_SendString(char *str)
+{
+	unsigned char j = 0;
+
+	while (str[j] != 0) {
+		UART_TxChar(str[j++]);
+	}
+}
 
 int main(void)
 {
+	char buf[64];
+
+	UART_Init(9600);
+
+	for (int i = 1;; i++) {
+		if (i >= 999) i = 1;
+		sprintf(buf, "BOINK #%03d\r\n", i);
+		UART_SendString(buf);
+		_delay_ms(3000);
+	}
+
 	return 0;
 }