mjs513
Senior Member+
@neurofun - @KurtE
Curious - made the change to SPI.cpp in post #25 and it is still showing 272 ms/page @18Mhz SPI. Makes it more curious that @manitou showed in post #24 SPI clock is actually faster in beta #3.
BTW: what spi clock are you running at?
EDIT: If I run at 22mhz in beta#3 is taking me 161,280 ms/page. Which makes sense that since 22mhz setting would equate to something like 24-25mhz in actuality with beta3. In beta2 22Mhz would probably below the speed limit. You are over the speed limit for the RA875.
@22Mhz - 161.280 ms/page
@20Mhz - 421 ms/page
@18Mhz - 259 ms/page
@16Mhz - 259 ms/page
@14Mhz - 271 ms/page
@12Mhz - 271 ms/page
This is the warning from the usersetting.h file:
EDIT2: can you run your display at about 18 or 19Mhz with Beta3
Curious - made the change to SPI.cpp in post #25 and it is still showing 272 ms/page @18Mhz SPI. Makes it more curious that @manitou showed in post #24 SPI clock is actually faster in beta #3.
BTW: what spi clock are you running at?
EDIT: If I run at 22mhz in beta#3 is taking me 161,280 ms/page. Which makes sense that since 22mhz setting would equate to something like 24-25mhz in actuality with beta3. In beta2 22Mhz would probably below the speed limit. You are over the speed limit for the RA875.
@22Mhz - 161.280 ms/page
@20Mhz - 421 ms/page
@18Mhz - 259 ms/page
@16Mhz - 259 ms/page
@14Mhz - 271 ms/page
@12Mhz - 271 ms/page
This is the warning from the usersetting.h file:
So looks like the problem is with the RA8875 not beta3.After som mail exchange with RAiO I solved the dilemma behind SPI speed limit:
The RA8875 has limitation of 12Mhz SPI but this has been set because not all internal macros
can run over that speed, the library automatically deal with this so I was able to go over 20Mhz!
At that speed you need to short cables as much you can, provide clean supply and good decoupling!
DO NOT Exceed 23Mhz for RA8875! It will result in garbage on screen or run very slow.
EDIT2: can you run your display at about 18 or 19Mhz with Beta3
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