Lpc2000

Hi,

I've also write an SPI driver for the LPC2106 & LPC2292. I haven't 
fully tested it yet so I can't compare it with your code. (I hope I 
can do this soon.) If you like I can post it here.

Anyway, two hints:
1) Have a look at the errata sheet of the LPC you are using. I know 
for sure that there is a bug in the LPC2106 preventing you from 
correctly utilizing the status register.
2) I don't see a read function in your driver. Keep in mind that to 
receive data the clock needs to be driven by the master. This is only 
done on a transmission of data, so to receive data you need to send 
out (dummy) data. So SPI is basically always bi-directional. If the 
higher layer protocol is not you just add dummy data in the direction 
that you don't use (at that moment).

Hope this helps.

Kind Regards,
Teun van de Berg


--- In lpc2000@yahoogroups.com, "acetoel" <acetoel@y...> wrote:
> 
> Ok... here is a piece of code that I make.. please somebody give a
> hand, I don't want to bit bang a IO pin to make a SPI communication.
> Eventhough I will communicate with a Atmel Dataflash, and the speed 
is
> not important (I have to get at least 52k/sec, with SPI at 7.5MH I 
get
> more than 900k/sec, and with bit banging at 1Mhz I get 125k/sec 
which
> is enough).
> Here is my code to send a byte, and to receive... really I need
> something bidirectional (send and receive at the same time).
> 
> 
> #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)) 
> 
> 
> void spi_init(unsigned long PCLKBus, SPIRate, CPHA, CPOL, MSTR, 
LSBF,
> SPIE) {
>  unsigned long SPIDivider;
>  SPI_SPCR=0x00000000; // Disable SPI
>  
> // Calculate SPI_SPCCR - MIN SPIC_SPCCR = 8 -> @60MHZ, SPIRate = 
7.5Mhz 
>  SPIDivider = PCLKBus / SPIRate;
>  if (SPIDivider <= 0x7) {
>    SPIDivider = 0x00000008; // MAX Speed for any PCLK Speed
> }
>  SPI_SPCCR = SPIDivider;
>  
> // Set The SPI Mode
> 
>  if (CPHA == 1 ) {
>     SPI_SPCR = (SPI_SPCR + 0x00000008);
>  }
>  
>  if (CPOL == 1) {
>     SPI_SPCR = SPI_SPCR + 0x00000010;
>  } 
>  
>  if (LSBF == 1) {
>     SPI_SPCR = SPI_SPCR + 0x00000040; 
>  }
>  
>  if (MSTR == 1) {
>  	SPI_SPCR = SPI_SPCR + 0x00000020;
>  } 
> }
> 
> void spi_sendbyte (unsigned char spidata) {
> 	SPI_SPDR = spidata;
> 	while ((SPI_SPSR & 0x80) == 1) {} //Waits until TX is complete
> 	SPI_SPSR = SPI_SPSR & (1 << 7)
> }
> 
> 
> -------------------------------------------------------------
>  
> 
> Thanks
> Ezequiel
> 
> 
> --- In lpc2000@yahoogroups.com, Bruce Paterson <bruce@t...> wrote:
> > acetoel wrote:
> > 
> > > 
> > > Hello...
> > > 
> > > Is there any sample code that shows how to read and write a 
byte on
> > > the SPI bus? or any SPI sample code?
> > 
> > Ooops sorry ! My message about ARMlib seems to be premature on 
furthur 
> > investigation. It's only byte (not interrupt message based) and 
has
> only 
> > C stubs at present.
> > 
> > -- 
> > Cheers,
> > Bruce
> > ------------------------------------------------------------------
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