Date: Fri, 25 Nov 2011 16:22:29 +0100
From: S?bastien Bourdeauducq <sebastien@milkymist.org>
To: "Milkymist One, Milkymist SoC and Flickernoise developers' list"
        <devel@lists.milkymist.org>
Subject: [Milkymist-devel] RTEMS patch for video formats

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Hi,

The attached patch implements RTEMS driver support for different video
formats.

S-Video and Component are untested, because I do not have suitable
sources. However, when using these modes, feeding the composite signal
into the Y input gives a greyscale picture, so they likely work.

I'm also sending a screenshot of the new video input settings dialog.
When in composite mode, I'm planning to add keyboard shortcuts to
switch between the 3 inputs live.

S.

Index: rtems/c/src/lib/libbsp/lm32/shared/milkymist_video/milkymist_video.h
===================================================================
--- rtems.orig/c/src/lib/libbsp/lm32/shared/milkymist_video/milkymist_video.h	2011-08-01 10:48:40.000000000 -0300
+++ rtems/c/src/lib/libbsp/lm32/shared/milkymist_video/milkymist_video.h	2011-11-26 01:09:16.000000000 -0300
@@ -8,7 +8,7 @@
  *
  *  $Id: milkymist_video.h,v 1.1 2011/08/01 13:48:40 joel Exp $
  *
- *  COPYRIGHT (c) 2010 Sebastien Bourdeauducq
+ *  COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq
  */
 
 #ifndef __MILKYMIST_VIDEO_H_
@@ -33,6 +33,16 @@
 #define VIDEO_SET_REGISTER     0x5609
 #define VIDEO_GET_REGISTER     0x560a
 
+#define VIDEO_SET_FORMAT       0x560b
+
+enum {
+  VIDEO_FORMAT_CVBS6 = 0,
+  VIDEO_FORMAT_CVBS5,
+  VIDEO_FORMAT_CVBS4,
+  VIDEO_FORMAT_SVIDEO,
+  VIDEO_FORMAT_COMPONENT,
+};
+
 rtems_device_driver video_initialize(
   rtems_device_major_number major,
   rtems_device_minor_number minor,
Index: rtems/c/src/lib/libbsp/lm32/shared/milkymist_video/video.c
===================================================================
--- rtems.orig/c/src/lib/libbsp/lm32/shared/milkymist_video/video.c	2011-08-01 10:48:40.000000000 -0300
+++ rtems/c/src/lib/libbsp/lm32/shared/milkymist_video/video.c	2011-11-26 01:09:16.000000000 -0300
@@ -267,6 +267,37 @@
   );
 }
 
+static void set_format(int format)
+{
+  switch(format) {
+    case VIDEO_FORMAT_CVBS6:
+      write_reg(0x00, 0x00);
+      write_reg(0xc3, 0x05);
+      write_reg(0xc4, 0x80);
+      break;
+    case VIDEO_FORMAT_CVBS5:
+      write_reg(0x00, 0x00);
+      write_reg(0xc3, 0x0d);
+      write_reg(0xc4, 0x80);
+      break;
+    case VIDEO_FORMAT_CVBS4:
+      write_reg(0x00, 0x00);
+      write_reg(0xc3, 0x04);
+      write_reg(0xc4, 0x80);
+      break;
+    case VIDEO_FORMAT_SVIDEO:
+      write_reg(0x00, 0x06);
+      write_reg(0xc3, 0xd5);
+      write_reg(0xc4, 0x80);
+      break;
+    case VIDEO_FORMAT_COMPONENT:
+      write_reg(0x00, 0x09);
+      write_reg(0xc3, 0x45);
+      write_reg(0xc4, 0x8d);
+      break;
+  }
+}
+
 rtems_device_driver video_control(
   rtems_device_major_number major,
   rtems_device_minor_number minor,
@@ -333,7 +364,7 @@
       break;
     
     case VIDEO_SET_REGISTER:
-      write_reg(((unsigned int )a & 0xffff0000) >> 16,
+      write_reg(((unsigned int)a & 0xffff0000) >> 16,
         (unsigned int)a & 0x0000ffff);
       sc = RTEMS_SUCCESSFUL;
       break;
@@ -342,6 +373,11 @@
       sc = RTEMS_SUCCESSFUL;
       break;
     
+    case VIDEO_SET_FORMAT:
+      set_format((int)a);
+      sc = RTEMS_SUCCESSFUL;
+      break;
+    
     default:
       sc = RTEMS_UNSATISFIED;
       break;