Merge branch 'master' of ssh://anxur.fi.muni.cz/~kas/html/git/tinyboard

[tinyboard.git] / projects / rgb-led-light / serial.c

diff --git a/projects/rgb-led-light/serial.c b/projects/rgb-led-light/serial.c
new file mode 100644 (file)
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();
+}
+