149 lines
3.7 KiB
C
Executable File
149 lines
3.7 KiB
C
Executable File
/*
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Floppy Emu, copyright 2013 Steve Chamberlin, "Big Mess o' Wires". All rights reserved.
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Floppy Emu is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported
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license. (CC BY-NC 3.0) The terms of the license may be viewed at
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http://creativecommons.org/licenses/by-nc/3.0/
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Based on a work at http://www.bigmessowires.com/macintosh-floppy-emu/
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Permissions beyond the scope of this license may be available at www.bigmessowires.com
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or from mailto:steve@bigmessowires.com.
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*/
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <string.h>
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void init_spi (void); /* Initialize SPI port (asmfunc.S) */
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void deselect (void); /* Select MMC (asmfunc.S) */
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void select (void); /* Deselect MMC (asmfunc.S) */
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void xmit_spi (uint8_t d); /* Send a byte to the MMC (asmfunc.S) */
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void dly_100us (void); /* Delay 100 microseconds (asmfunc.S) */
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extern const uint8_t tiny_font[][3] PROGMEM;
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const uint8_t tiny_font[][3] = {
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{0x1e,0x05,0x1e}, // 41 A
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{0x1f,0x15,0x0a}, // 42 B
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{0x0e,0x11,0x11}, // 43 C
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{0x1f,0x11,0x0e}, // 44 D
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{0x1f,0x15,0x15}, // 45 E
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{0x1f,0x05,0x05}, // 46 F
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{0x0e,0x15,0x1d}, // 47 G
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{0x1f,0x04,0x1f}, // 48 H
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{0x11,0x1f,0x11}, // 49 I
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{0x08,0x10,0x0f}, // 4a J
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{0x1f,0x04,0x1b}, // 4b K
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{0x1f,0x10,0x10}, // 4c L
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{0x1f,0x06,0x1f}, // 4d M
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{0x1f,0x0e,0x1f}, // 4e N
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{0x0e,0x11,0x0e}, // 4f O
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{0x1f,0x05,0x02}, // 50 P
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{0x00,0x10,0x00}, // 51 . (not Q)
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{0x1f,0x0d,0x16}, // 52 R
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{0x12,0x15,0x09}, // 53 S
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{0x01,0x1f,0x01}, // 54 T
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{0x0f,0x10,0x1f}, // 55 U
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{0x07,0x18,0x07}, // 56 V
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{0x1f,0x0c,0x1f}, // 57 W
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{0x00,0x00,0x00}, // 58 space (not X)
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{0x03,0x1c,0x03}, // 59 Y
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{0x00,0x0a,0x00} // 5a : (not Z)
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};
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#define LCD_DDR DDRB
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#define LCD_PORT PORTB
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#define LCD_RESET_PIN_NUMBER 0
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#define LCD_CS_PIN_NUMBER 2
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#define LCD_DC_DDR DDRD
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#define LCD_DC_PORT PORTD
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#define LCD_DC_PIN_NUMBER 6
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void LcdCommand()
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{
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LCD_DC_PORT &= ~(1<<LCD_DC_PIN_NUMBER);
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}
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void LcdData()
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{
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LCD_DC_PORT |= (1<<LCD_DC_PIN_NUMBER);
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}
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void LcdWrite(uint8_t data)
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{
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deselect(); // make sure the SD card is not selected
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LCD_PORT &= ~(1<<LCD_CS_PIN_NUMBER);
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xmit_spi(data);
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LCD_PORT |= (1<<LCD_CS_PIN_NUMBER);
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}
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void LcdGoto(uint8_t x, uint8_t y)
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{
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LcdCommand();
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LcdWrite(0x80 | x);
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LcdWrite(0x40 | y);
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}
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void LcdClear(void)
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{
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LcdData();
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for (uint16_t index = 0; index < 84 * 6; index++)
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{
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LcdWrite(0x00);
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}
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}
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void LcdString(const char *s)
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{
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LcdData();
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uint8_t c;
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while ((c = pgm_read_byte_far(s)))
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{
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unsigned short charbase = (c - 0x41) * 3;
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s++;
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for (uint8_t index = 0; index < 3; index++)
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{
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// need to use pgm_read_byte_far on Atmegas with more than 64K Flash
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uint8_t pixels = pgm_read_byte_far((unsigned char*)tiny_font + charbase + index);
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pixels = pixels << 1;
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LcdWrite(pixels);
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}
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LcdWrite(0x00);
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}
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}
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void LcdInit()
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{
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// set LCD pin directions
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LCD_DDR |= (1<<LCD_RESET_PIN_NUMBER);
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LCD_DDR |= (1<<LCD_CS_PIN_NUMBER);
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LCD_DC_DDR |= (1<<LCD_DC_PIN_NUMBER);
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init_spi();
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// toggle RST low to reset; CS low so it'll listen to us
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LCD_PORT &= ~(1<<LCD_CS_PIN_NUMBER);
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LCD_PORT |= (1<<LCD_RESET_PIN_NUMBER);
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for (uint8_t n = 200; n; n--) dly_100us();
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LCD_PORT &= ~(1<<LCD_RESET_PIN_NUMBER);
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for (uint8_t n = 200; n; n--) dly_100us();
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LCD_PORT |= (1<<LCD_RESET_PIN_NUMBER);
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for (uint8_t n = 200; n; n--) dly_100us();
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LcdCommand();
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LcdWrite(0x21); // LCD Extended Commands.
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LcdWrite(0xBF); // Set LCD Vop (Contrast).
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LcdWrite(0x14); // LCD bias mode
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LcdWrite(0x20);
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LcdWrite(0x0C); // LCD in normal mode. 0x0d for inverse
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LcdGoto(0,0);
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LcdClear();
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} |