Ivo van Poorten / vga640x400

Three-pin 640x400 VGA Console Mode

Dependents:   projet_AWA_testVGA2

vga640x400.h@4:3f0bd68a4dda, 2011-08-10 (annotated)

Committer:
Ivop
Date:
Wed Aug 10 11:31:23 2011 +0000
Revision:
4:3f0bd68a4dda
Parent:
0:78fa88bb24cb
Child:
5:c34147b65f7d
documentation, 2nd draft

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 4:3f0bd68a4dda 4 extern unsigned char text_buffer[80*25]; ///< 80x25 screen buffer, i.e. 25 lines of 80 characters.
Ivop 4:3f0bd68a4dda 5 extern unsigned char *font; ///< Pointer to the user supplied font.
Ivop 4:3f0bd68a4dda 6 ///< Each character is 8 pixels wide and 16 pixels high.
Ivop 4:3f0bd68a4dda 7 ///< The font consists of 16 groups of 256 bytes.
Ivop 4:3f0bd68a4dda 8 ///< i.e. 256 times the first byte of each character, then
Ivop 4:3f0bd68a4dda 9 ///< 256 times second byte of each character, and so on.
Ivop 4:3f0bd68a4dda 10 ///< This differs from the most common way bitmap fonts are
Ivop 4:3f0bd68a4dda 11 ///< ordered, so you have to preprocess your font data first.
Ivop 4:3f0bd68a4dda 12
Ivop 0:78fa88bb24cb 13
Ivop 4:3f0bd68a4dda 14 /** Initialize the VGA signal
Ivop 4:3f0bd68a4dda 15 *
Ivop 4:3f0bd68a4dda 16 * This function should be the very first thing you call, before doing anything else.
Ivop 4:3f0bd68a4dda 17 * It turns off all peripherals, sets the main clock to 100MHz (instead of the 96MHz default of the mbed)
Ivop 4:3f0bd68a4dda 18 * and switches on PWM, I2S and DMA.
Ivop 4:3f0bd68a4dda 19 */
Ivop 0:78fa88bb24cb 20 void init_vga(void);
Ivop 0:78fa88bb24cb 21
Ivop 0:78fa88bb24cb 22 #endif