From 27321e05de35b494c2b282652e1c40a18435b68b Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Fri, 4 Jun 2021 19:09:07 +0200
Subject: implement uart

---
 src/main.c | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index c0f35d7..a73e7ef 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2,24 +2,62 @@
 #include <avr/interrupt.h>
 #include <stdint.h>
 
+#include "uart.h"
+
+uint8_t t0_ovf_cnt = 0;
+
+uint8_t pb0_thresh = 128;
+
 ISR(TIMER0_OVF_vect) {
 	cli();
+	/*TCNT0 = (1<<7);*/ /* Hack-increase Interrupt trigger freq */
+
+	t0_ovf_cnt ++;
+
+	if ( t0_ovf_cnt >= pb0_thresh )
+		PORTB &= ~(1<<PINB0);
+	else
+		PORTB |= (1<<PINB0);
 
 	sei();
 }
 
+ISR(TIMER2_OVF_vect) {
+	cli();
+	pb0_thresh ++;
+	sei();
+}
+
 int main(void) {
+	char c;
+
 	cli();
 
-	/* Enable TIMER0 with interrupt */
+	/* Pins */
+	DDRB |= (1<<PINB0);
+
+	/* Enable TIMER0 with interrupt, no prescaler */
 	TCCR0 |= (1<<CS00);
 	TIMSK |= (1<<TOIE0);
+
+	/* Enable TIMER2 with interrupt, Clk divide by 1024 */
+	/*
+	TCCR2 |= (7<<CS20);
+	TIMSK |= (1<<TOIE2);
+	*/
+
+	/* Uart */
+	uart_init();
 	
 	/* Go! */
 	sei();
 
 	while(1){
+		if( uart_getchar(&c) )
+			continue;
 
+		uart_putchar(c);
+		pb0_thresh = c;
 	}
 
 	return 0;
-- 
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