I am trying to connect a PIC16F877 to an Atmel AT45D041A 4 mega-bit
DataFlash chip. However I am having some difficulty with the build in SPI
port on the PIC. I am able to get it sending data, however it appears to be
sending bits out SO on both the rising AND falling edges of the SCK output.
Also, I only get a total of 4 SCK clock cycles for each byte sent. I can see
nothing wrong with my configuration of the SPI registers (they match
examples from the Microchip application notes and other sources), I have the
TRIS port configured correctly (I am getting output), and I have all unused
pins grounded via resisters. No other code or peripherals are in use at the
time other than the UART. I have tried this with the Atmel chip in and out
of circut. I have also tried running the SPI clock at Fosc/4, Fosc/64 and
TIMER2/2.

I have exhausted all avenues I can think of tracking this down, and I may
resort to bit-banging it if I can not get the built in peripheral to work.
However that is far less desirable.

Thanks for any help.

Linus Dillon.

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