SPI & I2C....NOT GETTING CLOCK OUTPUT

hi thanks for your reply yes there is a configuration register for pinouts PINSEL that i hav configured for my SPI operation.so i dont think there could be any mistake as such

And is there also a data direction register in which you have set the appropriate pins to be outputs?

~Dave~

yes there is also a data direction register IODIR .in that i hav configured spiclk pin as output.

Not relevant. PINSEL does that for you, as long as you don't select GPIO for these pins.

hi,

please help me out.

i am still not able to get the clock output of SPI. And i am not able to find its possible cause thank you

I don't think PINSEL selects the direction, only the function (at least on the data sheet I've seen). There has to be a way to mode the clock as an input or an output, depending on whether you have a bus master or a slave.

OP: Do you have the SPI moded as a bus _master_? Are you using a scope that would show you a single event? Do you have it triggered correctly? Are you seeing any error status from the SPI? Are you getting a chip select?

~Dave~

yes there is IODIR register for that.

yes SPI is configured for master operation.yes the scope could be set to trace single events also.

but what do you mean by triggering it correctly ?? what is the use for chip select when spi is configured for master operation already. what error status?? i am polling on master side.

Op Wed, 18 Oct 2006 08:04:20 +0200 schreef abhay :

No! It isn't. LPC213x User Manual (rev. 01), page 74: "The direction control bit in the IO0DIR register is effective only when the GPIO function is selected for a pin."

To let the scope do the work of detecting interesting signal levels.

Op Tue, 17 Oct 2006 19:36:59 +0200 schreef abhay :

See my reply in comp.sys.arm.