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make ATARI video "modelines" more readable

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This commit is contained in:
Markus Fröschle
2017-04-19 19:37:33 +00:00
parent 58c41152d5
commit 11a432e59f
1 changed files with 41 additions and 8 deletions
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49
BaS_gcc/sys/BaS.c
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@@ -467,31 +467,64 @@ void BaS(void)
* ATARI video modes "modeline"
*
* horizontal:
* high word = h_total
* low word = hsync_start
* high word: h_total
* low word: hsync_start
*
* vertical:
* high word = v_total
* low word = vsync_start
* 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
struct atari_video_timing
{
uint16_t total;
uint16_t sync_start;
};
static volatile struct atari_video_timing *hor_640x480 = (volatile struct atari_video_timing *) 0xf0000410;
static volatile struct atari_video_timing *ver_640x480 = (volatile struct atari_video_timing *) 0xf0000414;
static volatile struct atari_video_timing *hor_320x240 = (volatile struct atari_video_timing *) 0xf0000418;
static volatile struct atari_video_timing *ver_320x240 = (volatile struct atari_video_timing *) 0xf000041c;
#define VIDEO_25MHZ
#ifdef VIDEO_25MHZ
hor_640x480->total = 0x2ba;
hor_640x480->sync_start = 0x2ba;
ver_640x480->total = 0x20c;
ver_640x480->sync_start = 0x20a;
hor_320x240->total = 0x190;
hor_320x240->sync_start = 0x15d;
ver_320x240->total = 0x20c;
ver_320x240->sync_start = 0x20a;
#ifdef _NOT_USED_
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 */
*/
#endif /* _NOT_USED_ */
#else /* 32 MHz */
hor_640x480->total = 0x370;
hor_640x480->sync_start = 0x2ba;
ver_640x480->total = 0x20d;
ver_640x480->sync_start = 0x20a;
hor_320x240->total = 0x2a0;
hor_320x240->sync_start = 0x1e0;
ver_320x240->total = 0x5a0;
ver_320x240->sync_start = 0x168;
#ifdef _NOT_USED_
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 /* _NOT_USED_ */
#endif
/* fifo on, refresh on, ddrcs and cke on, video dac on */