On Wed, 4 Feb 2009, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 17:59 Wed 04 Feb , Guennadi Liakhovetski wrote:
> > +
> > +/*
> > + * Each transfer is performed as:
> > + * 1. chip-select active
> > + * 2. send 8-bit start code
> > + * 3. send 16-bit data
> > + * 4. chip-select inactive
> > + */
> > +static int send_word(struct spi_slave *spi, u8 rs, u16 data)
> > +{
> > + u32 buf8 = 0x70 | ID | (rs & 2);
> why?
That's how the start byte looks like:
01110<ID><RS><R/W>
rs is 0 for index or 1 for data, and R/W is 0 for write.
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: off...@denx.de
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
