Lpc2000

Hallo Rajendra

The initialisation seems OK - 100k in master mode.

Make sure the SSEL pin is pulled up to '1' - there is an error in 
the device which doesn't allow sending if this is not the case.

Try the following transmission code - eg

unsigned char ucTest[] = {1,2,3,4,5};

fnSendSPIMessage(ucTest, sizeof(ucTest));

void fnSendSPIMessage(unsigned char *ptrData, unsigned short 
usLength)
{
  while (!(SPI_SPSR & SPIF)) {}; // wait for transmitter free
                                 // ensures that write works
  while (usLength--) {
    IOCLR = SPI_SSEL_OUT;       // activate SSEL  
    SPI_SPDR = *ptrData++;      // Set data Byte
    while (!(SPI_SPSR & SPIF)) {}; // wait for transmission to 
complete
    IOSET = SPI_SSEL_OUT;       // remove SSEL
  }
}

Note: SPI_SSEL_OUT is an output port to contol the SSEL line to the 
slave - the LPC2104 doesn't do this itself and SSEL can not be used 
for this purpose (needs the pullup and can not be programmed as 
output).
SPIF is 0x80.

This may help. The LPC2104 works OK as master but the SSEL line has 
to be wasted. As slave I gave up because it just didn't send 
sensible data back...

Regards

Mark Butcher

www.mjbc.ch

--- In lpc2000@yahoogroups.com, "rockraj_2003" <rockraj_2003@y...> 
wrote:
> 
> HELLO FRIENDS,
> 
> No body giving me suggestion on how to program SPI.
> My real task is to configure "DP1203" by using LPC2104.
> The only way to configure DP1203 is throu "SPI".
> I got an example file from Keil. 
> Its working and producing SCK(Serial Clock).
> I fixed the Clk Frequency at 100Khz. But I am getting only 40 Mhz.
> I just Send an 8 bit Data After if i send other Data its not 
> reponding.
> The SCK pin is in low State.
> The "DP1203" has got 8 address bit and 8 data bit.
> So totally 16 bit for One Configuration of Registers.
> But I want to Configure more than 20 Registers.
> Can any one Suggest me where i am doing the mistake.
> 
> Here is the Code
> #include <LPC210x.H>
> 
> #define SPI_SPCR       (*((volatile unsigned char *) 0xE0020000))
> #define SPI_SPSR       (*((volatile unsigned char *) 0xE0020004))
> #define SPI_SPDR       (*((volatile unsigned char *) 0xE0020008))
> #define SPI_SPCCR      (*((volatile unsigned char *) 0xE002000C))
> #define SPI_SPTCR      (*((volatile unsigned char *) 0xE0020010))
> #define SPI_SPTSR      (*((volatile unsigned char *) 0xE0020014))
> #define SPI_SPTOR      (*((volatile unsigned char *) 0xE0020018))
> #define SPI_SPINT      (*((volatile unsigned char *) 0xE002001C))
> 
> int main (void) 
> {
> int i;
> VPBDIV = 1; 
> IODIR = 0x80; 
> IOSET = 0x80;
> PINSEL0 = 0x5500;
> SPI_SPCCR = 0x93; 
> SPI_SPCR = 0x20;
> while (1) {
> do SPI_SPDR = 0x55; 
> while((SPI_SPSR & 0x80)==0); 
> for(i=0;i<10000;i++);
> SPI_SPSR = 0x00;
> do SPI_SPDR = 0x0F; 
> while((SPI_SPSR & 0x80)==0);
> goto OUT;
> }
> 
> OUT: for(i=0;i<1000;i++);
> 
> while (1) {
> do SPI_SPDR = 0xF0; 
> while((SPI_SPSR & 0x80)==0);
> for(i=0;i<100000;i++);
> goto OUT;
> }
> }
> 
> 
> 
> 
> 
> 
> Thank U,
> 
> with Regards,
> Rajendra R