Lpc2000

Make sure the SSEL0 pin on the MASTER is configured for SPI usage and
is pulled-up.

Regards
-Bill Knight
R O SOftWare &
http://www.theARMPatch.com



On Thu, 09 Feb 2006 23:22:36 +0000, johnleerberg wrote:

>Hi All
>      I have been working with the LPC2138 for about 12 months on and 
>off and have had NO problems with getting any of the peripherals 
>working until now. 

>I have two LPC2138's connected via SPI0 and am intending to setup one 
>as a master and the other a slave that adds two serial ports to my 
>master.

>There are two issues:

>1) With MOSI to MOSI, P1.24 (master) to SSEL0 (slave), SCLK0 to SCLK0 
>and MISO floating i am seeing a mirror of what is being transmitted 
>by the master on the MISO pin of the slave????? And i mean a perfect 
>mirror with no time shift, with the 4 channel CRO i am using i can 
>overlay one waveform ontop of the other and they match perfectly. Yes 
>i have put a multimeter across the pins to check for conductivity and 
>no there is no solder across the MOSI and MISO.

>2) I can get the SPI interrupt the fire on both the master and the 
>slave but randomly the master will just lock up (something i have 
>never had happen before). Also the upon power reset the SPI wont 
>start but the serial port start perfectly everytime.
>My program has three basic sections
>a) In main i call an init interrupt routine which initialises the SPI 
>port on the master.
>b) In my ISR i read the S0SPSR (clear it), write 0xA0 to S0SPCR, 
>clear the interrupt by writing 0x01 to S0SPINT, clear the VicVectAddr.
>c) In main i write 0x5A to S0SPDR then wait 4ms and repeat (while(1) 
>loop)

>If anyone can help me it would be greatly appreciated.

>   





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