diff options
Diffstat (limited to 'notes/vga.txt')
| -rw-r--r-- | notes/vga.txt | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/notes/vga.txt b/notes/vga.txt index d75281a..43b6830 100644 --- a/notes/vga.txt +++ b/notes/vga.txt @@ -7,8 +7,7 @@ gpio_write_bit() is about 360ns (2.78MHz) Writing to GPIO?_BASE is about 60ns (16.6MHz -> 18MHz) -pwm write 0x0001 is about 30ns (33MHz) with prescaler as 1 (default) -pwm write 0x0001 is about 14ns (72MHz) with prescaler as 0 (!) +PWM write 0x0001 is about 14ns (72MHz) with prescaler as 0 (!) VGA Timing ------------------------------------------------------------------------------ @@ -34,9 +33,3 @@ Crude 640x480 directions: 11 lines front porch 2 lines Vsync (low) 31 lines back porch - -Currently, setting vs. clearing GPIO registers seems to take a different amount -of time? Or perhaps i'm not analyzing branching correctly. Regardless, if you -SET 100x times then UNSET on one line, then UNSET 100x then SET the next line, -the two changes in color will generally not line up. - |