mega168 version

5x7test.c

@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 02/2010 by Olaf Rempel                                  *
+ *   Copyright (C) 03/2010 by Olaf Rempel                                  *
  *   razzor@kopf-tisch.de                                                  *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
@@ -20,71 +20,109 @@
 #include <avr/interrupt.h>
 #include <avr/pgmspace.h>
 
-#define F_CPU 3686400
+#define F_CPU 8000000
 #include <util/delay.h>
 
 #include "6x8_vertikal_LSB_1.h"
 
-/*
- * at90s2313 pinout:
- * PB0-4 => LED C1-5
- * PB5-7 => free/ISP
- * PD0-6 => LED R1-7 (with 100R resistors)
- */
+#define nop() asm volatile ("nop")
 
-/* for TC12-11 */
-//#define	COL_SEL(x)	PORTB = ~(x)
-//#define COL_DATA(x)	PORTD = (x)
-
-/* for TA12-11 */
-#define COL_SEL(x)	PORTB = (x)
-#define COL_DATA(x)	PORTD = ~(x)
+#define nCLEAR	PB0
+#define RCLK	PB1
+#define nOE	PB2
+#define MOSI	PB3
+#define MISO	PB3
+#define SCK	PB5
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
 
-static const char text[] = " <<<AT90S2313:Scrolltext-Demo>>>";
+static const char text[] = "    <<<atmega168:Scrolltext-Demo>>>  ";
 
 /* scrollbuffer */
-static volatile uint8_t data[5 + 1 + 5];
+static volatile uint8_t data[32];
 static volatile uint8_t offset;
 
+void setRow(uint8_t row)
+{
+	uint8_t i;
+	volatile uint8_t *p = data + offset + 19;
+
+	row = (1 << row);
+
+	/* bit-banging spi, 20 cols */
+	for (i = 0; i < 20; i++) {
+		PORTB &= ~(1<<MISO);
+		if (*p-- & row)
+			PORTB |= (1<<MOSI);
+
+		PORTB |= (1<<SCK);
+		PORTB &= ~(1<<SCK);
+
+		/* insert extra cols (unused hc595 outputs) */
+		if (i == 5 || i == 12 || i == 19) {
+			PORTB |= (1<<SCK);
+			PORTB &= ~(1<<SCK);
+		}
+	}
+
+	/* disable outputs, update register */
+	PORTB |= ((1<<nOE) | (1<<RCLK));
+
+	/* select row */
+	PORTC |= 0x07;
+	PORTC &= ~(row & 0x07);
+	PORTD |= 0x78;
+	PORTD &= ~(row & 0x78);
+
+	/* enable outputs again */
+	PORTB &= ~((1<<nOE) | (1<<RCLK));
+}
+
 ISR(SIG_OVERFLOW0)
 {
-	static uint8_t col;
-	/* ~2,8ms */
-	TCNT0 = 0xFF - 40;
+	static uint8_t row;
 
-	COL_DATA(0x00);
-	COL_SEL(1 << col);
-	COL_DATA(data[offset + col]);
+	/* 2ms */
+	TCNT0 = 0xFF - 64;
 
-	col = (col == 5) ? 0 : col + 1;
+	setRow(row++);
+	if (row == 7)
+		row = 0;
 }
 
 int main(void)
 {
+	/* row 1-3 */
+	DDRC  = 0x07;
+	PORTC = 0x07;
+
+	/* row 4-7 */
+	DDRD  = 0x78;
+	PORTD = 0x78;
+
+	/* ctrl signals */
+	DDRB  = (1<<nCLEAR) | (1<<RCLK) | (1<<nOE) | (1<<MOSI) | (1<<SCK);
+	PORTB = (1<<nCLEAR) | (1<<nOE);
+
+	/* F_CPU/256, Overflow Interrupt */
+	TCCR0B = (1<<CS02);
+	TIMSK0 = (1<<TOIE0);
+
+	sei();
+
 	uint8_t mode = 0;
 	uint8_t pos = 0;
 	uint8_t delay = 0;
 
-	DDRB = 0x1F;
-	DDRD = 0x7F;
-
-	/* Timer0: FCPU/256 */
-	TCCR0 = (1<<CS02);
-	TIMSK = (1<<TOIE0);
-	sei();
-
 	while (1) {
 		switch (mode)
 		{
 		case 0:
 			if (offset == 6) {
 				offset = 0;
-				if (text[pos +1] == '\0') {
+				if (text[pos +3] == '\0') {
 					pos = 0;
 					mode++;
-					break;
 
 				} else {
 					pos++;
@@ -92,27 +130,37 @@ int main(void)
 			}
 
 			if (offset == 0) {
-				memcpy_P((void *)&data[0], font[(uint8_t)text[pos]], 5);
-				memcpy_P((void *)&data[1 + 5], font[(uint8_t)text[pos +1]], 5);
+				int i;
+				for (i = 0; i < 5; i++) {
+					memcpy_P((void *)&data[i * 6], font[(uint8_t)text[pos + i]], 5);
+				}
 			}
 
 			offset++;
-			delay = 12;
+			delay = 6;
 			break;
 
 		case 1:
-			memcpy_P((void *)&data[0], &font[pos], 5);
+			if (offset == 6) {
+				offset = 0;
+				if (pos == (ARRAY_SIZE(font) -3)) {
+					pos = 0;
+					mode++;
 
-			if (pos == (ARRAY_SIZE(font) -1)) {
-				pos = 0;
-				mode++;
-				break;
-
-			} else {
-				pos++;
+				} else {
+					pos++;
+				}
 			}
 
-			delay = 20;
+			if (offset == 0) {
+				int i;
+				for (i = 0; i < 5; i++) {
+					memcpy_P((void *)&data[i * 6], font[(uint8_t)pos + i], 5);
+				}
+			}
+
+			offset++;
+			delay = 6;
 			break;
 
 		default:

5x8_vertikal_LSB_1.h

@@ -1,3 +1,4 @@
+// font from http://www.mikrocontroller.net/topic/54860 */
 const prog_char font[][5]={
 {0x00,0x00,0x00,0x00,0x00},	// 0x00
 {0x1E,0x35,0x31,0x35,0x1E},	// 0x01

Makefile

@@ -1,6 +1,6 @@
 PRG            = 5x7test
 OBJ            = 5x7test.o
-MCU_TARGET     = at90s2313
+MCU_TARGET     = atmega168
 OPTIMIZE       = -Os
 
 DEFS           =
@@ -41,5 +41,5 @@ bin:  $(PRG).bin
 	$(OBJCOPY) -j .text -j .data -O binary $< $@
 
 install: all
-	avrdude -p 2313 -c avr910 -b 115200 -P /dev/ttyUSB0 -e -V -U flash:w:$(PRG).hex
-#	avrdude -c dragon_isp -P usb -p 2313 -B 2 -e -V -U flash:w:$(PRG).hex
+#	avrdude -p 2313 -c avr910 -b 115200 -P /dev/ttyUSB0 -e -V -U flash:w:$(PRG).hex
+	avrdude -c dragon_isp -P usb -p m168 -e -V -U flash:w:$(PRG).hex