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ubb-vga2.c: corrected and improved loading of the first TX word
- ubb-vga2.c (line): write the first word to the TX FIFO after starting the command or it is lost - ubb-vga2.c (line): fetch the first word while waiting for the back porch, making sure we have plenty of time for cache effects - ubb-vga2.c (line): we no longer need to prefetch the first word of the next line
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@ -265,6 +265,7 @@ void setup(void)
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static void line(const uint32_t *line)
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{
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const uint32_t *p = line;
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uint32_t first;
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/* Back porch */
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@ -273,7 +274,7 @@ static void line(const uint32_t *line)
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*msc_strpcl = 1 << 3; /* reset the MSC */
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// while (*msc_stat & (1 << 15));
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*msc_txfifo = *p++;
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first = *p++;
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until(US(0.79));
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@ -316,6 +317,8 @@ static void line(const uint32_t *line)
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/* Front porch */
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*msc_txfifo = first;
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*pdfuns = CMD;
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*pddats = HSYNC;
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*pdfunc = CMD;
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@ -344,7 +347,6 @@ static void line(const uint32_t *line)
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}
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fail:
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(void) *(volatile const uint32_t *) p;
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until(line_cycles);
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}
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