Lpc2000

--- In lpc2000@yahoogroups.com, "Ronnie Leighty" <rleighty@a...> wrote:
> SPI Related question:
> 
> I'm having trouble getting the SPI running on a LPC2119. I have the
below
> setup routines and running in RAM. I'm waiting to probe the clocks but
> nothing is happening. My design is called out to read another uC's
IO that's
> bit bagging byte data out where its sync to operate as a slave
device so its
> IO is tied to the LPC2119 MISO. I don't have my MOSI tied to
anything other
> than a pull-up.
> 
> Any help would be greatly appreciated..
> 
> Regards
> 
> 
> 1. SET PORT DIRECTION FOR SPI EVEN THOUGH I THOUGHT SELECTING THE MODULE
> WILL OVERRIDE IT!
> IO0DIR |= (SEQ1 | SEQ3 | VOLTAGEFLT | BYPASS | OVERRIDE | TP3  | RW422 |
> DETRSTn | SCK0 | MOSI0 | SSEL0);
> 
> 2. SELECT MODULE
> PINSEL0	0x00001505	turning SPI0 and SSEL0 on!
> 
> 3. INIT FUNCTION TO ENABLE SPI AT 25Khz GIVEN 20MHz CLOCK WITH VPB = 0!
> void InitSPI0()
> {
> 
>   PINSEL0 |= (SCK_0 | MISO_0 | MOSI_0);
> 
>   //Set module as Master
>   S0SPCR |= 0x20; //(MSTR);
> 
>   //Set Control Register
>   //S0SPCR |= 0x80; //Enable hardware spi interrrupt
> 
>   //Set Clock rate
>   S0SPCCR = 200;  //20Mhz/4 = 5Mhz/200 = 25Khz.
> 
> }
> 
> 4. SEND BYTE OUT PORT
> void SPI0ByteWrite(char byte)
> {
>   S0SPDR = byte;
> }
> 
> Nothing happens! Any clues...
> 
> Ronnie Leighty
> Principle Engineer
> 2802 Leslie Rd
> Tampa, FL 33619
> voice (813) 630-1229 ext. 111
> fax     (813) 630-2619
> 
> 
> -----Original Message-----
> From: James Dabbs [mailto:jdabbs@t...]
> Sent: Monday, February 28, 2005 9:34 AM
> To: lpc2000@yahoogroups.com
> Subject: RE: [lpc2000] Re: SPI Performance
> 
> 
> 
> > The SPI of the LPC213x is 4 times faster (max 30MHz).
> 
> OK.  Thanks.  Can you really make use of this speed without a FIFO or
> DMA?
> 
> 
> 
> 
> Yahoo! Groups Links

Hi Ronnie,

what have you done with the SSEL0 pin ?
It must be logical high to enable the SPI.

Andreas