Lpc2000

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@...]
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?




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