Lpc2000

Hello... That's the part that I didn't finish, the RX part. I'll use
SPI with Atmel DataFlash in a few weeks. My idea is to port a FAT16 FS
to LPC2106.
Please send the code to  sunixs@..., or post it here.
Thanks
Ezequiel


--- In lpc2000@yahoogroups.com, "teunvandeberg"
<teun.van.de.berg@p...> wrote:
> 
> 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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