Ivo van Poorten / vga640x400

Three-pin 640x400 VGA Console Mode

Dependents:   projet_AWA_testVGA2

vga640x400.h@7:746c1bf00d40, 2011-08-10 (annotated)

Committer:
Ivop
Date:
Wed Aug 10 11:47:24 2011 +0000
Revision:
7:746c1bf00d40
Parent:
6:1d73ad03f172 
added documentation

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Ivop 0:78fa88bb24cb 1 #ifndef VGA640X400_H
Ivop 0:78fa88bb24cb 2 #define VGA640X400_H
Ivop 0:78fa88bb24cb 3
Ivop 5:c34147b65f7d 4 /**
Ivop 5:c34147b65f7d 5 * @file vga640x400.h
Ivop 6:1d73ad03f172 6 * Generate a 640x400 VGA signal.
Ivop 6:1d73ad03f172 7 *
Ivop 6:1d73ad03f172 8 * The following mbed pins are used:
Ivop 7:746c1bf00d40 9 * - DIP5 - Monochrome bitstream (connect to R, G and B through 470R resistors)
Ivop 7:746c1bf00d40 10 * - DIP8 - VSYNC
Ivop 7:746c1bf00d40 11 * - DIP25 - HSYNC
Ivop 7:746c1bf00d40 12 * - GND
Ivop 5:c34147b65f7d 13 */
Ivop 5:c34147b65f7d 14
Ivop 4:3f0bd68a4dda 15 extern unsigned char text_buffer[80*25]; ///< 80x25 screen buffer, i.e. 25 lines of 80 characters.
Ivop 4:3f0bd68a4dda 16 extern unsigned char *font; ///< Pointer to the user supplied font.
Ivop 4:3f0bd68a4dda 17 ///< Each character is 8 pixels wide and 16 pixels high.
Ivop 4:3f0bd68a4dda 18 ///< The font consists of 16 groups of 256 bytes.
Ivop 4:3f0bd68a4dda 19 ///< i.e. 256 times the first byte of each character, then
Ivop 6:1d73ad03f172 20 ///< 256 times the second byte of each character, and so on.
Ivop 4:3f0bd68a4dda 21 ///< This differs from the most common way bitmap fonts are
Ivop 4:3f0bd68a4dda 22 ///< ordered, so you have to preprocess your font data first.
Ivop 4:3f0bd68a4dda 23
Ivop 0:78fa88bb24cb 24
Ivop 4:3f0bd68a4dda 25 /** Initialize the VGA signal
Ivop 4:3f0bd68a4dda 26 *
Ivop 4:3f0bd68a4dda 27 * This function should be the very first thing you call, before doing anything else.
Ivop 4:3f0bd68a4dda 28 * It turns off all peripherals, sets the main clock to 100MHz (instead of the 96MHz default of the mbed)
Ivop 4:3f0bd68a4dda 29 * and switches on PWM, I2S and DMA.
Ivop 4:3f0bd68a4dda 30 */
Ivop 0:78fa88bb24cb 31 void init_vga(void);
Ivop 0:78fa88bb24cb 32
Ivop 0:78fa88bb24cb 33 #endif