DCON test tool at http://david.woodhou.se/fbtest.c http://david.woodhou.se/fbtest


   1.  Check DCON <-> VGA mode transitions. They should be glitchless and an IRQ should arrive promptly.

fbtest source 0 # enter DCON mode
fbtest source 1 # Enter VGA mode

# Repeat, with different intervals between the changes to allow for clock drift.

   2. Check sleep mode and auto-sleep mode.

# Sleep mode and autosleep mode are bits 1 and 2 of the DCON mode register
# (register 1). The number of frames before autosleep is register 8.

fbtest source 0		# DCON mode.
fbtest setreg 1 0x6b	# Sleep
fbtest setreg 1 0x69	# Wake
fbtest setreg 8 50	# 50 frames; i.e. 1 second.
fbtest setreg 1 0x6d	# Enable autosleep.
sleep 1			# should turn off after 1s
fbtest getreg 1		# Read mode register. Bit 2 should now be set (0x6f)

   3. Check ECPWRRQST transition from sleep mode.

# Press any key on the keyboard. The DCON should wake.

   4. Check blanking.

# Blanking is bit 4 of the DCON mode register.

fbtest setreg 1 0x79	# Observe blank screen
fbtest setreg 1 0x69	# Observe normal screen

   5. Check dot-clock divider setting to request DCON mode refresh frequency

See documentation of bits 9-11 of DCON mode register. Try various settings.

   6. Check colour, anti-aliasing, monochrome modes. Watch for setup/hold time problems on the display.

fbtest source 1		# Mode changes only take effect in VGA mode
fbtest setreg 1 0x69	# Colour, AA
fbtest setreg 1 0x29	# Colour, no AA
fbtest setreg 1 0x89	# Mono

   7. Set backlight to each level 0-15. Check for noise and fluctuations.

# backlight level is register 10. Backlight enable is bit 3 of DCON mode reg.

fbtest setreg 1 0x61	# Backlight off.
fbtest setreg 1 0x69	# Backlight on
fbtest setreg 10 1	# backlight low
# etc.

   8. Check correctness of colours in colour mode

# Visual test.

   9. Verify SDRAM self-refresh: Enter DCON mode, enter sleep mode, wait. Enter DCON mode again. 

fbtest source 0
fbtest setreg 1 0x6b
sleep 60
fbtest setreg 1 0x69
fbtest setreg 1 0x6b
sleep 600
fbtest setreg 1 0x69

# At some point you may want to go back into VGA mode before you do other stuff