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ubb-vga2.c (line, frame): start line timer outside the "line" function

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The indirection introduced with the non-contiguous frame buffer caused
significant horizontal distortions. We can compensate for them by
starting the timer before loading the line pointer and calling "line".
This commit is contained in:
Werner Almesberger 2011-04-29 13:20:56 -03:00
parent 623f3ccbe3
commit a63579e119
1 changed files with 9 additions and 3 deletions
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12
ubb-vga/ubb-vga2.c
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@ -230,8 +230,6 @@ static void line(const uint32_t *line)
/* Back porch */
TCNT(TIMER) = 0;
MSC_STRPCL = 1 << 3; /* reset the MSC */
// while (MSC_STAT & (1 << 15));
@ -351,8 +349,16 @@ static void frame(void *const *f)
PDDATS = HSYNC;
until(mode->line_cycles-US(0.79));
for (p = f; p != f+mode->yres; p++)
/*
* Note: resetting the timer just before calling "line" isn't enough.
* We have t reset it before the loop and right after returning from
* "line".
*/
TCNT(TIMER) = 0;
for (p = f; p != f+mode->yres; p++) {
line(*p);
TCNT(TIMER) = 0;
}
/* Back porch */
hdelay(14);