Dear Joshua
OK, I give you a simple program segment.
You need to see the document about SPI of DM644x.
==========================================
// --------------------------------
// Reset SPI
// --------------------------------
control=0x00000000;
SPI_REG(SPIGCR0)=control;
mdelay(1);
control=0x00000001;
SPI_REG(SPIGCR0)=control;
// --------------------------------
// Enable SPI CLK & Master
// --------------------------------
control=0x00000003;
SPI_REG(SPIGCR1)=control;
// --------------------------------
// Enable pins : DI、DO、CLK、EN0
// --------------------------------
control=0x00000FFF;
SPI_REG(SPIPC0)=control;
/* --------------------------------
// Set data format in SPIFMT0
// SHIFTDIR in bit 20 set to 1 : LSB
// POLARITY and PHASE in bit 17, 16 set to 0, 1
// PRESCALE in bit 15-8 set to 0, SPI_CLK = SYSCLK5 / (Prescale + 1)
// CHARLEN in bit 4-0 set to 08 : 8 bit
-------------------------------- */
control=0x0012FF08;
SPI_REG(SPIFMT0)=control;
// --------------------------------
// Set data format for used -> SPIFMT0
// --------------------------------
control=0x00000000 | 0x00 << 24;
SPI_REG(SPIDAT1)=control;
// --------------------------------
// Set hold time and setup time
// --------------------------------
control=0x0000 | 0x03 << 16 | 0x02 << 24;
SPI_REG(SPIDELAY)=control;
// --------------------------------
// Out of reset for SPI
// --------------------------------
control=0x00000001;
SPI_REG(SPIGCR0)=control;
// --------------------------------
// Set Chip Select Default
// CSHOLD -> 1 -> hold SPI_EN0 state -> bit 28
// CSNR -> 3 -> disable all
// --------------------------------
control=SPI_REG(SPIDAT1);
control|=0x3 << 16;
SPI_REG(SPIDAT1)=control;
// --------------------------------
// Enable for transforing
// --------------------------------
control=SPI_REG(SPIGCR1);
control=control | 1 << 24; // enable SPIENA
SPI_REG(SPIGCR1)=control;
=============================================
Send data
control=csnr << 16 | cshold << 28;
control|=buf;
SPI_REG(SPIDAT1)=control;
Read data
control=SPI_REG(SPIBUF);
MSG("SPIBUF = %08X",control);
if(control & (1 << 31))
MSG("!! No Data received ");
else{
while(1){
control=SPI_REG(SPIBUF);
if(control & (1 << 29))
continue;
else
break;
MSG("wait for data receive ...");
}
MSG("receive data : %04X", (control & 0xFFFF));
}
================================
just for reference.
If it has any questions, please let me know , and help me to fix them.
Best Regards,
Sean
On Dec 18, 2007 11:52 AM, Joshua Hintze <[EMAIL PROTECTED]> wrote:
> Thanks Sean,
>
> Do you still have the code that I might take a look at?
>
> Josh
>
>
> On Dec 17, 2007, at 8:45 PM, Sean <[EMAIL PROTECTED]> wrote:
>
> Dear
>
> I write the SPI driver by myself. Just to write the corresponding
> registers.
> There is no interface driver about SPI, I felt so sad too.
>
> Best Regards,
> Sean
>
> On Dec 18, 2007 2:09 AM, Joshua Hintze < <[EMAIL PROTECTED]>[EMAIL PROTECTED]>
> wrote:
>
> > Since nobody answered yet, I'm curious has anybody done SPI interfacing
> > on the Davinci?
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Josh
> >
> >
> >
> >
> >
> >
> > ---------------------------------------------------------------------------------------
> >
> > Hey guys,
> >
> >
> >
> > Have any of you interfaced to the SPI port on the Davinci 6446. I got
> > the i2c working pretty easy using the i2c-dev character driver but there is
> > no such thing as spidev until linux kernel 2.6.22.
> >
> >
> >
> >
> >
> > So I'm wondering how others are doing it. Are you writing your own
> > kernel drivers or is there still a way to do it from user space?
> >
> >
> >
> > Thanks in advance,
> >
> >
> >
> > Josh
> >
> > _______________________________________________
> > Davinci-linux-open-source mailing list
> > <[email protected]>
> > [email protected]
> > <http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source>
> > http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
> >
> >
>
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