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SPI On LPC936

I`m having a problem with the SPI bus on a LPC936 maybe someone can help.
Whenever I try and send date the clock signal is there but the MOSI pin is just logic low the whole time. The port

pins are assigned correctly and the SPI module i think is configured properly (checked this with code architect)
I had it working once when I traced the fault down to 1 line of code that was toggling P2.0 in a timer 0 interrupt,

but now the fault is back and I dont know why. I`m thinking something to do with the interrupts clashing or a bank

problem but not sure - any ideas?
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