Troubleshooting: Difference between revisions
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(New page: ===No image and High pitch noise=== * There's nothing in the screen or bunch of random lines/dots appears * The sound is a horrible high pitched noise out the speaker Insure *only* these...) |
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Insure *only* these fuses are activated: | Insure *only* these fuses are activated: | ||
-BODLEVEL2 | -BODLEVEL2 | ||
-BODLEVEL1 | -BODLEVEL1 | ||
-BODLEVEL0 | -BODLEVEL0 | ||
-EESAVE | -EESAVE | ||
'''IF''' you are using a crystal: | '''IF''' you are using a crystal: | ||
-CKSEL2 | -CKSEL2 | ||
-CKSEL1 | -CKSEL1 | ||
-CKSEL0 | -CKSEL0 | ||
-SUT0 | -SUT0 | ||
'''IF''' you are using an oscillator module: | '''IF''' you are using an oscillator module: |
Revision as of 14:26, 3 February 2009
No image and High pitch noise
- There's nothing in the screen or bunch of random lines/dots appears
- The sound is a horrible high pitched noise out the speaker
Insure *only* these fuses are activated:
-BODLEVEL2 -BODLEVEL1 -BODLEVEL0 -EESAVE
IF you are using a crystal:
-CKSEL2 -CKSEL1 -CKSEL0 -SUT0
IF you are using an oscillator module: (TBD)
EESAVE preserves the eeprom between flash writes (will be useful later on). CKSEL=0111 SUT=01 starts with a full swing oscillator 16K delay+0ms. Mega644s ships with CKDIV8 AND JTAGEN activated and must be uncheked. CKDIV8 internally divides the master clock by 8, so your Uzebox runs at 3.57Mhz. No chance it will generate video with that! Also JTAGEN activates the debug port, which is on the VIDEO DAC port and will screw up some color component if left active.