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ubb-vga: avoid diodes; redesign for luminance bit (Y) and MMC controller

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- ubb-vga.sch: use resistive divider instead of diodes
- ubb-vga.sch, ubb-vga.c (VSYNC): moved VSYNC from DAT3 to CLK to make
  all MMC data lines available for pixel data
- ubb-vga.sch, ubb-vga.c (R): moved red from DAT2 to DAT3 for convenient
  access to the 4th channel
- ubb-vga.sch: added luminance (Y) channel
- ubb-vga.sch: added pull-down to HSYNC/CMD, for later use with the MMC
  controller
- ubb-vga.c (pdfuns, pdfunc, ben_setup, setup): make UBB signals GPIOs,
  in case someone left them in a different configuration
This commit is contained in:
Werner Almesberger
2011-04-27 16:48:07 -03:00
parent ce1c6af24f
commit a794c4b1b2
2 changed files with 298 additions and 169 deletions
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9
ubb-vga/ubb-vga.c
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@@ -48,11 +48,11 @@ static uint8_t thres = 63;
#define CMD (1 << 8)
#define CLK (1 << 9)
#define R DAT2
#define R DAT3
#define G DAT0
#define B DAT1
#define HSYNC CMD
#define VSYNC DAT3
#define VSYNC CLK
/* ----- Ben hardware ------------------------------------------------------ */
@@ -73,6 +73,7 @@ static uint32_t old_clkgr;
static volatile uint32_t *pdpin, *pddats, *pddatc;
static volatile uint32_t *pddirs, *pddirc;
static volatile uint32_t *pdfuns, *pdfunc;
static volatile uint32_t *tssr, *tscr;
static volatile uint32_t *tesr, *tecr;
@@ -169,6 +170,9 @@ static void ben_setup(void)
pddats = base+0x10314;
pddatc = base+0x10318;
pdfuns = base+0x10344;
pdfunc = base+0x10348;
pddirs = base+0x10364;
pddirc = base+0x10368;
@@ -237,6 +241,7 @@ void setup(void)
{
mlockall(MCL_CURRENT | MCL_FUTURE);
ben_setup();
*pdfunc = R | G | B | HSYNC | VSYNC;
*pddirs = R | G | B | HSYNC | VSYNC;
}