[Paparazzi-devel] Reply to"Re: PPM encoders with non-blinking LED (Simon Wilks)"

[Chris]

Hi.
Here is the possible problem:

The first batch of PPM encoders used the mega 168 which use the internal 
rc oscillator.
The right fuses then are:
LOW_FUSE_168 = 0xC2
HIGH_FUSE_168 = 0xDC
EXTENDED_FUSE_168 = 0xF8
LOCK_FUSE_168 = 0xFF

Programmed = write 0 or check the corresponding fuse check box in the 
avr studio
Unprogrammed = write 0 or check the corresponding fuse check box in the 
avr studio
When a fuse is set to "1" then it is unprogrammed (inactive)
Basically you need to unprogram the CKDIV8 (write "1") and BODLEVEL2  
fuse and program (write "0")
the BODLEVEL1, BODELEVEL0  and BOOTRST fuses.
In AVR studio just select BODLEVEL = 4.3V, check the BOOTRST fuse and 
uncheck the CKDIV8 fuse.
All other fuses remain at default values

When the Mega328p is used with a crystal like the newer version then the 
fuses must be
LOW_FUSE_328 = 0xDF
HIGH_FUSE_328 = 0xD8
EXTENDED_FUSE_328 = 0xFC
LOCK_FUSE_328 = 0xFF

Again the CKDIV8 fuse must be unprogrammed (write "1")
The BOOTRST fuse must be programmed (write "0")
The clock fuses must be set:
CKSEL0,1,2,3 and SUT0 fuses must be unprogrmmed (write "1")
SUT1 fuse must be programmed (write "0")
The BODLEVEL must be set:
Unprogram (write "1") the BODLEVEL2  fuse and program (write "0")
the BODLEVEL1 and  BODELEVEL0 fuses.
In AVR studio just select BODLEVEL = 4.3V, uncheck the CKDIV8 fuse and 
select the clock source to be
 "Low power crystal oscillator" or "Full swing crystal oscillator" with 
a range of 8 to 16 Mhz and brown out enabled if you see this option in 
the drop down box.
Chris