HD200 - calibrate lcdlinear[] matrix

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26910 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 23 insertions, 16 deletions

diff --git a/apps/plugins/lib/grey_core.c b/apps/plugins/lib/grey_core.c
index 50e70e3b8e..27f7e585d8 100644
--- a/apps/plugins/lib/grey_core.c
+++ b/apps/plugins/lib/grey_core.c
@@ -271,23 +271,30 @@ static const unsigned char lcdlinear[256] = {
 #define LCD_SCANRATE 80 /* Hz */
 
 #elif defined MPIO_HD200
+/* matrix generated in the following way
+ * 1) run 5 times test_grey
+ * 2) average results (joint points)
+ * 3) plot full matrix obtained by natural cubic b-spline interpolation
+ * 4) hand tweak joint points to smooth the curve
+ * 5) repeat steps 3 and 4 until interpolated curve is smooth
+ */
 static const unsigned char lcdlinear[256] = {
-  0,   1,   2,   3,   4,   5,   6,   7,   8,   9,  10,  11,  12,  13,  14,  15,
- 16,  17,  18,  19,  20,  21,  22,  23,  24,  25,  26,  27,  28,  29,  30,  31,
- 32,  32,  32,  32,  32,  33,  33,  33,  33,  33,  34,  34,  34,  34,  34,  35,
- 35,  35,  36,  36,  36,  37,  37,  38,  38,  38,  39,  39,  40,  40,  40,  41,
- 41,  42,  43,  44,  45,  46,  47,  48,  49,  50,  52,  54,  56,  58,  60,  61,
- 62,  62,  62,  62,  62,  62,  62,  62,  62,  62,  62,  62,  62,  62,  62,  62,
- 62,  62,  63,  64,  65,  66,  67,  68,  69,  70,  71,  72,  73,  74,  75,  76,
- 78,  78,  79,  80,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,
- 93,  94,  95,  96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 107, 109,
-110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125,
-125, 126, 127, 129, 130, 132, 133, 134, 136, 137, 138, 140, 141, 142, 144, 145,
-146, 145, 147, 149, 150, 152, 153, 154, 156, 157, 158, 160, 162, 164, 165, 166,
-167, 167, 168, 168, 169, 169, 170, 170, 171, 171, 172, 172, 173, 174, 175, 176,
-177, 177, 178, 178, 179, 179, 180, 180, 181, 181, 182, 182, 183, 184, 185, 186,
-187, 188, 188, 189, 190, 190, 191, 192, 192, 193, 194, 195, 196, 197, 197, 198, 
-198, 201, 205, 208, 212, 215, 219, 222, 226, 229, 233, 236, 240, 243, 247, 252
+  0,   0,   0,   1,   1,   2,   2,   3,   3,   4,   4,   5,   5,   6,   6,   7,
+  8,   8,   9,   9,  10,  10,  11,  11,  12,  12,  13,  13,  14,  14,  15,  15,
+ 16,  16,  16,  17,  17,  18,  18,  18,  19,  19,  20,  20,  20,  21,  21,  21,
+ 22,  22,  22,  22,  23,  23,  23,  24,  24,  24,  24,  25,  25,  25,  26,  26,
+ 27,  27,  27,  28,  28,  29,  29,  30,  30,  31,  31,  32,  32,  33,  33,  34,
+ 35,  35,  36,  36,  37,  37,  38,  39,  39,  40,  41,  41,  42,  43,  43,  44,
+ 45,  45,  46,  46,  47,  48,  49,  49,  50,  51,  51,  52,  53,  53,  54,  55,
+ 56,  56,  57,  58,  58,  59,  60,  61,  61,  62,  63,  64,  64,  65,  66,  67,
+ 68,  68,  69,  70,  71,  71,  72,  73,  74,  75,  75,  76,  77,  78,  79,  80,
+ 81,  81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,
+ 96,  96,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106, 108, 109, 110, 111,
+113, 114, 115, 117, 118, 120, 121, 123, 125, 126, 128, 130, 131, 133, 135, 137,
+139, 140, 142, 144, 146, 147, 149, 151, 152, 154, 156, 157, 159, 161, 162, 164,
+166, 167, 169, 170, 172, 173, 175, 176, 177, 179, 180, 182, 183, 184, 186, 187,
+189, 190, 191, 193, 194, 195, 197, 198, 199, 201, 202, 203, 205, 206, 207, 208,
+210, 211, 212, 213, 214, 215, 217, 218, 219, 220, 221, 222, 223, 224, 225, 227
 };
 #define LCD_SCANRATE 153 /* Hz */