X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?p=tinyboard.git;a=blobdiff_plain;f=projects%2Frgb-led-light%2Fserial.c;fp=projects%2Frgb-led-light%2Fserial.c;h=1ab2e42dc891c38c1b354be02877323f2fea7774;hp=0000000000000000000000000000000000000000;hb=65fc48a197b52af65b549095a4171cfc8746373d;hpb=3c1c6465bb29893ccb26b131986d803a169f007f

diff --git a/projects/rgb-led-light/serial.c b/projects/rgb-led-light/serial.c
new file mode 100644
index 0000000..1ab2e42
--- /dev/null
+++ b/projects/rgb-led-light/serial.c
@@ -0,0 +1,88 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+
+#include "rgbstring.h"
+
+void init_serial()
+{
+	PORTB &= ~(_BV(PB1) | _BV(PB2));
+	DDRB |= _BV(PB1) | _BV(PB2);
+
+#if 0
+	TCCR0A = _BV(WGM01) | _BV(WGM00);
+	TCCR0B = _BV(WGM02) | _BV(CS00);
+	OCR0A = 2;
+#endif
+
+	zero_frame();
+}
+
+static void send_byte(unsigned char b)
+{
+	unsigned char i, mask;
+
+#if 0
+	USIDR = b;
+	USISR = _BV(USIOIF);
+	USICR = _BV(USIWM0) | _BV(USICS0);
+
+	while (!(USISR & _BV(USIOIF)))
+		;
+#endif
+
+#if 0
+	USIDR = b;
+	USISR = _BV(USIOIF);
+
+	while ( (USISR & _BV(USIOIF)) == 0 ) {
+		USICR = _BV(USIWM0) | _BV(USICS1) | _BV(USICLK);
+		USICR = _BV(USIWM0) | _BV(USICS1) | _BV(USICLK) | _BV(USITC);
+	}
+#endif
+
+#if 0
+	for (i = 0; i < 8; i++) {
+		USICR = _BV(USIWM0) | _BV(USITC);
+		USICR = _BV(USIWM0) | _BV(USITC) | _BV(USICLK);
+	}
+#endif
+
+#if 1
+	for (i = 0; i < 8; i++) {
+		PORTB &= ~_BV(PB2);		// clock low
+		if (b & 0x80)			// data bit on or off
+			PORTB |= _BV(PB1);
+		else
+			PORTB &= ~_BV(PB1);
+		b <<= 1;
+		PORTB |= _BV(PB2);		// clock high
+	}
+#endif
+}
+
+void end_frame()
+{
+	PORTB &= ~_BV(PB2);			// clock low
+	_delay_us(1000);
+}
+
+void send_rgb(unsigned char r, unsigned char g, unsigned char b)
+{
+	send_byte(r);
+	send_byte(g);
+	send_byte(b);
+}
+
+
+void zero_frame()
+{
+	unsigned char i;
+
+	for (i = 0; i < STRIP_SIZE; i++) {
+		send_rgb(0, 0, 0);
+	}
+
+	end_frame();
+}
+