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(re-) enable 32 MHz video timing for ST modes

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This commit is contained in:
Markus Fröschle
2017-04-18 20:47:47 +00:00
parent 96f0b47291
commit 58c41152d5
1 changed files with 32 additions and 11 deletions
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43
BaS_gcc/sys/BaS.c
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@@ -52,7 +52,7 @@
#include "pci.h"
#include "video.h"
// // #define DEBUG
// #define DEBUG
#include "debug.h"
/* imported routines */
@@ -457,21 +457,42 @@ void BaS(void)
* (volatile uint8_t *) (0xffff8802 - 0) = 0;
xprintf("finished\r\n");
xprintf("set IDE 0 & 1 to FireBee high speed mode: ");
* (volatile uint32_t *) 0xf0040000 &= 0xff00ffff; /* clear speed bits (= slow mode)*/
* (volatile uint32_t *) 0xf0040000 |= 0x00110000; /* set both units to 1 (=fast mode) */
xprintf("finished\r\n");
xprintf("enable video: ");
/*
* video setup (25MHz)
*/
* (volatile uint32_t *) 0xf0000410 = 0x032002ba; /* horizontal 640 x 480 */
* (volatile uint32_t *) 0xf0000414 = 0x020c020a; /* vertical 640 x 480 */
* (volatile uint32_t *) 0xf0000418 = 0x0190015d; /* horizontal 320 x 240 */
* (volatile uint32_t *) 0xf000041c = 0x020c020a; /* vertical 320 x 240 */
/*
* ATARI video modes "modeline"
*
* horizontal:
* high word = h_total
* low word = hsync_start
*
* vertical:
* high word = v_total
* low word = vsync_start
*
* can be calculated with umc ("universal modeline generator")
*
*/
#define ATARI_HH * (volatile uint32_t *) 0xf0000410
#define ATARI_VH * (volatile uint32_t *) 0xff000414
#define ATARI_HL * (volatile uint32_t *) 0xff000418
#define ATARI_VL * (volatile uint32_t *) 0xff00041c
#ifdef VIDEO_25MHZ
ATARI_HH = 0x032002ba; /* horizontal timing 640 x 480 */
ATARI_VH = 0x020c020a; /* vertical timing 640 x 480 */
ATARI_HL = 0x0190015d; /* horizontal timing 320 x 240 */
ATARI_VL = 0x020c020a; /* vertical timing 320 x 240 */
#else /* 32 MHz */
ATARI_HH = 0x037002ba; /* horizontal timing 640 x 480 */
ATARI_VH = 0x020d020a; /* vertikal timing 640 x 480 */
ATARI_HL = 0x02a001e0; /* horizontal timing 320 x 240 */
ATARI_VL = 0x05a00160; /* vertikal timing 320 x 240 */
#endif
/* fifo on, refresh on, ddrcs and cke on, video dac on */
* (volatile uint32_t *) 0xf0000400 = 0x01070082;