Differences

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--- chumbyhackerboard:vga [2010/09/21 05:15]
ladyada
+++ chumbyhackerboard:vga [2010/09/21 05:38]
ladyada
@@ Line 32: / Line 32: @@
   * back porch: 31 horizontal lines
-so HW_LCDIF_VDCTRL1 = 542 (0x21e)
+so HW_LCDIF_VDCTRL1 = 524 (0x20C)
 ====== HW_LCDIF_VDCTRL0 ======
@@ Line 60: / Line 60: @@
 -> 0x00340002
+====== HW_LCDIF_VDCTRL3 ======
+by default = 0x004b0027
+  * MUX_SYNC_SIGNALS = 0
+  * VSYNC_ONLY = 1 (?)
+  * HORIZONTAL_WAIT_CNT = 48 (h back porch) + 96 (sync pulse) = 0xDE and then
+  * VERTICAL_WAIT_CNT = 31 (v back porch) + 2 (sync pulse) = 0x21
+-> 0x00DE0021
 ====== HW_LCDIF_TRANSFER_COUNT ======
@@ Line 77: / Line 87: @@
 ===== Results? =====
+PIXCLK = 0x0F
+HSync = 31.3Khz (should be 31.46)
-HSync = 31.4Khz (should be 31.46)
+Vsync = 59.75 Hz (should be 60.04)
-Vsync = 58 Hz (should be 60.04)
+Vsync negative pulse = 63.9 uS (should be 63.57) (it is low from the negative edge of one HSync to another negative Hsync edge)
-Vsync negative pulse = 63.7 uS (should be 63.57) (it is low from the negative edge of one HSync to another negative Hsync edge)
+Hsync negative pulse = 3.83 uS (should be 3.81)
-Hsync negative pulse = 4.34 uS (should be 3.81)
+HSync Back porch = 5 uS (should be 1.9?), Hsync front porch = ~14.2uS (should be 0.65?)

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