Troubleshooting: Difference between revisions
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Insure *only* these fuses are activated: | Insure *only* these fuses are activated (written fuse=0, unwritten fuse=1): | ||
''' IF''' you are using a crystal: | |||
-EESAVE | -EESAVE | ||
-CKSEL3 | |||
-SUT1 | |||
''' | '''IF''' you are using an oscillator module: | ||
-EESAVE | |||
-CKSEL0 | |||
-CKSEL1 | |||
-CKSEL2 | -CKSEL2 | ||
- | -CKSEL3 | ||
-SUT0 | -SUT0 | ||
-SUT1 | -SUT1 | ||
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. | 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. | 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. |
Revision as of 14:48, 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 (written fuse=0, unwritten fuse=1):
IF you are using a crystal:
-EESAVE -CKSEL3 -SUT1
IF you are using an oscillator module:
-EESAVE -CKSEL0 -CKSEL1 -CKSEL2 -CKSEL3 -SUT0 -SUT1
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.