# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1410226847 -10800
# Node ID 9db99968b55e6986cfd0d4beb22cb9b0a538b893

initial commit, screen test working

diff -r 000000000000 -r 9db99968b55e .hgignore
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.hgignore	Tue Sep 09 04:40:47 2014 +0300
@@ -0,0 +1,6 @@
+\.o$
+\.swp$
+\.hex$
+\.eep$
+^avrgame$
+\.map$
diff -r 000000000000 -r 9db99968b55e Makefile
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Makefile	Tue Sep 09 04:40:47 2014 +0300
@@ -0,0 +1,34 @@
+src = $(wildcard *.c)
+obj = $(src:.c=.o)
+bin = avrgame
+hex = $(bin).hex
+eep = $(bin).eep
+
+mcu_gcc = atmega328p
+mcu_dude = m328p
+
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+
+CFLAGS = -O2 -pedantic -Wall -mmcu=$(mcu_gcc) -DF_CPU=1000000
+LDFLAGS = -Wl,-Map,$(bin).map -mmcu=$(mcu_gcc)# -Wl,-u,vfprintf -lprintf_flt -lm
+
+.PHONY: all
+all: $(hex) $(eep)
+
+$(bin): $(obj)
+	$(CC) -o $@ $(obj) $(LDFLAGS)
+
+$(hex): $(bin)
+	$(OBJCOPY) -j .text -j .data -O ihex -R .eeprom $< $@
+
+$(eep): $(bin)
+	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@
+
+.PHONY: program
+program: $(hex)
+	avrdude -c usbtiny -p $(mcu_dude) -e -U flash:w:$(hex)
+
+.PHONY: clean
+clean:
+	rm -f $(bin) $(obj) $(hex) $(eep) $(bin).map
diff -r 000000000000 -r 9db99968b55e avrgame.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/avrgame.c	Tue Sep 09 04:40:47 2014 +0300
@@ -0,0 +1,38 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include "dotmatrix.h"
+
+/* hardware setup
+ * - Port B[1,5]: lcd signals (see dotmatrix.h)
+ *   - B1: clk
+ *   - B2: Din
+ *   - B3: DC
+ *   - B4: CE
+ *   - B5: RST
+ */
+
+/*int lcd_stream_write(char c, FILE *fp);*/
+
+/*FILE stream_lcd = FDEV_SETUP_STREAM(lcd_stream_write, NULL, _FDEV_SETUP_WRITE);*/
+
+int main(void)
+{
+	/* stdout = stderr = &stream_lcd; */
+
+	dm_init();
+	dm_test();
+
+	for(;;) {
+		_delay_ms(800);
+	}
+
+	return 0;
+}
+
+#if 0
+int lcd_stream_write(char c, FILE *fp)
+{
+	/* TODO terminal shit handling */
+	return 0;
+}
+#endif
diff -r 000000000000 -r 9db99968b55e dotmatrix.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dotmatrix.c	Tue Sep 09 04:40:47 2014 +0300
@@ -0,0 +1,190 @@
+#include <util/delay.h>
+#include "dotmatrix.h"
+
+enum { CMD, DATA };
+
+#define CMD_DISPCTL(x)		(((x) & 7) | (1 << 3))
+#define CMD_FUNCSET(x)		(((x) & 7) | (1 << 5))
+#define CMD_SETY(x)			(((x) & 7) | (1 << 6))
+#define CMD_SETX(x)			(((x) & 0x7f) | (1 << 7))
+
+#define CMD_EXT_BIAS(x)		(((x) & 7) | (1 << 4))
+#define CMD_EXT_VOP(x)		(((x) & 0x7f) | (1 << 7))
+
+#define FSET_BASIC		0
+#define FSET_EXTENDED	1
+#define FSET_VERTICAL	2
+#define FSET_POWERDOWN	3
+
+#define DCTL_BLANK		0
+#define DCTL_NORMAL		4
+#define DCTL_ALL		1
+#define DCTL_INVERSE	5
+
+#define FRAME_BYTES		((DM_WIDTH / 8) * DM_HEIGHT)
+
+#define PINMASK	\
+	((1 << DM_PIN_CLK) | \
+	(1 << DM_PIN_DIN) | \
+	(1 << DM_PIN_DC) | \
+	(1 << DM_PIN_CE) | \
+	(1 << DM_PIN_RST))
+
+#define SET(var, bit)	((var) |= 1 << (bit))
+#define CLR(var, bit)	((var) &= ~(1 << (bit)))
+
+#define NOP()	asm volatile ("nop")
+
+static void start_send(void);
+static void send(int type, unsigned char c);
+static void stop_send(void);
+static void send_byte(int type, unsigned char c);
+
+static int mode;
+
+int dm_init(void)
+{
+	int vop;
+
+	DM_DDR |= PINMASK;	/* set used pins as outputs */
+	SET(DM_PORT, DM_PIN_CE);
+	SET(DM_PORT, DM_PIN_RST);
+
+	/* reset the lcd controller */
+	CLR(DM_PORT, DM_PIN_RST);
+	NOP();
+	SET(DM_PORT, DM_PIN_RST);
+
+	/* set Vop (???) */
+	start_send();
+	send(CMD, CMD_FUNCSET(FSET_EXTENDED));
+	send(CMD, CMD_EXT_VOP(80));
+
+	/* select function set (vertical addressing, basic set) */
+	send(CMD, CMD_FUNCSET(FSET_VERTICAL | FSET_BASIC));
+
+	/* enable display (normal mode) */
+	mode = DCTL_NORMAL;
+	send(CMD, CMD_DISPCTL(mode));
+	stop_send();
+
+	dm_clear(0);
+
+	return 0;
+}
+
+/* fill the screen with a test pattern */
+void dm_test(void)
+{
+	static const unsigned char pattern[] = {
+		0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
+		0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
+		0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
+		0xf0, 0xf0, 0xf0, 0xf0, 0xf0, 0xf0,
+		0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
+		0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
+		0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
+		0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f
+	};
+	int i;
+
+	for(i=0; i<DM_HEIGHT / 8; i++) {
+		dm_copy(0, i * 8, pattern, sizeof pattern);
+	}
+	dm_copy(0, DM_HEIGHT - 4, pattern, 6 * 4);
+}
+
+void dm_invert(void)
+{
+	mode = (mode & 0xfe) | ((~mode) & 1);
+	send_byte(CMD, CMD_DISPCTL(mode));
+}
+
+void dm_clear(unsigned char val)
+{
+	int i;
+
+	start_send();
+	send(CMD, CMD_SETY(0));
+	send(CMD, CMD_SETX(0));
+
+	for(i=0; i<FRAME_BYTES; i++) {
+		send(DATA, val);
+	}
+	stop_send();
+}
+
+void dm_copy(int x, int y, const unsigned char *fb, int bytes)
+{
+	int i;
+
+	if(bytes <= 0 || bytes > FRAME_BYTES) {
+		bytes = FRAME_BYTES;
+	}
+
+	start_send();
+	send(CMD, CMD_SETY(x / 8));
+	send(CMD, CMD_SETX(y));
+
+	for(i=0; i<bytes; i++) {
+		send(DATA, *fb++);
+	}
+	stop_send();
+}
+
+static void start_send(void)
+{
+	/* start by pulling CE low */
+	CLR(DM_PORT, DM_PIN_CE);
+
+	/* enable SPI, master, clock/4, setup-falling, sample-rising, MSB-first */
+	SPCR = (1 << SPE) | (1 << MSTR);
+}
+
+static void stop_send(void)
+{
+	SPCR = 0;
+
+	/* end transfer by pulling CE high again */
+	SET(DM_PORT, DM_PIN_CE);
+}
+
+static void send(int type, unsigned char c)
+{
+	int i;
+	unsigned char bmask;
+
+	if(type == CMD) {
+		CLR(DM_PORT, DM_PIN_DC);
+	} else {
+		SET(DM_PORT, DM_PIN_DC);
+	}
+
+	SPDR = c;
+	while(!(SPSR & (1 << SPIF)));
+
+	/* bitbang */
+	/*
+	bmask = 1 << 7;
+	for(i=0; i<8; i++) {
+		CLR(DM_PORT, DM_PIN_CLK);
+
+		if(c & bmask) {
+			SET(DM_PORT, DM_PIN_DIN);
+		} else {
+			CLR(DM_PORT, DM_PIN_DIN);
+		}
+		bmask >>= 1;
+
+		SET(DM_PORT, DM_PIN_CLK);
+		NOP();
+	}
+	*/
+}
+
+static void send_byte(int type, unsigned char c)
+{
+	start_send();
+	send(type, c);
+	stop_send();
+}
diff -r 000000000000 -r 9db99968b55e dotmatrix.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dotmatrix.h	Tue Sep 09 04:40:47 2014 +0300
@@ -0,0 +1,27 @@
+#ifndef DOTMATRIX_H_
+#define DOTMATRIX_H_
+
+#include <avr/io.h>
+
+/* change these port/pin assignments to match the circuit */
+#define DM_PORT		PORTB
+#define DM_DDR		DDRB
+#define DM_PIN_CLK	5	/* sck */
+#define DM_PIN_DIN	3	/* mosi */
+#define DM_PIN_DC	1
+#define DM_PIN_CE	2
+#define DM_PIN_RST	0
+/* end of config block, don't touch anything below */
+
+#define DM_WIDTH	48
+#define DM_HEIGHT	84
+
+int dm_init(void);
+void dm_test(void);
+
+void dm_invert(void);
+
+void dm_clear(unsigned char val);
+void dm_copy(int x, int y, const unsigned char *fb, int bytes);
+
+#endif	/* DOTMATRIX_H_ */