Lpc2000

I just love it when you find the answer the moment after you click send!


> I have a IAR LPC2148 board and am having trouble getting any output on the
> SSP port.  I can wiggle the SPI0 port just fine.  No dice on the SSP port.
>  Once data is written into the data register SSPSR changes as expected,
> but nothing transmits.  The intent is 8-bit master SPI.  Oddly in user
> manual the CPOL bit for SPI0 and SPI1 means two different things.  And
> I've tried this with a SPI slave connected as well as nothing connected.
> SSEL1 has a pull-up, although I don't believe this is relavant with the
> SSP port on the LPC2148.  PCONP has SSP enabled.  What am I missing?
>
>
> #define P0_17 0x02
> #define P0_18 0x04
> #define P0_19 0x06
> #define P0_20 0x08
> #define DSS   0x07  /* Data Size 8-bit */
> #define CPHA     7  /* Clock Out Phase */
>
> PINSEL1 |= ((2<<P0_17)|(2<<P0_18)|(2<<P0_19)|(2<<P0_20));
> SSPCR0   = (1<<CPHA) | DSS;
> SSPCPSR  = 120;  /* random even value between 2 and 254 */
>
> SSPDR = 0x55; /* TFE, TNF, and BSY bits change state in SSPSR */
>
>
> Regards,
> Joel
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