Greg,
I would be very interested in hearing more about how you implemented spi
communication in the FGPA core of the 7500. We would like to avoid bit banging
if it is at all possible. And from what I understand the only options for spi
on the ts7500 are bit banging or programming the FPGA as you suggested.
Can you point me toward more information?
If possible can you send the hdl or source that you used for the FPGA that gave
you successful spi communication?
Thanks!
--- In "gmaglathlin" <> wrote:
>
> Actually if you use version 4 of the FPGA core a programmable SPI
> interface is supported. I modified the core to use different I/Os for
> Chip select #2 and #3. Specifically I changed the FPGA to use DIO 21
> for CS #2 and DIO 22 for CS#3. This allows me to use the FPGA SPI
> interface to read the TS-752 temperature sensor in approximately 2 usec
> with the following 5 instructions (works beautifully). You can still bit
> bang to get the data (as in the sbus.c gettemp() routine but this takes
> significantly longer.
>
> sbus_poke16(0x40, (0 << 14) | (15 << 10) | (3 << 8));
> sbus_poke16(0x4c, 0x8000);
> val = sbus_peek16(0x42) >> 3;
> if((val & 0x1000) != 0) val=((~(val & 0xfff) & 0xfff) + 1);
> temperature = (float) val * 62500.0 / 1000000.0;
>
> Modifying CS#2 to use DIO 21 allows for the interface of another spi
> device via the 20 pin header.
> I suggest looking at the latest ts-75xx/tsa-4500 document (published Feb
> 2010) and the fpga open core source code. Utilizing the free fpga
> devlopment software is a bit of a learning curve but well worth it. I
> think TS's decision to use the opencore framework for the 7500 is rather
> cool.
>
> Good luck,
> Greg
>
>
>
>
>
>
> --- In Razvan-Ionut Stoian
> <razvan_ionut_stoian@> wrote:
> >
> > TS7500 does not have a specific hardware SPI port (no hardware pins
> assigned).
> >
> > You have to bit bang 3 GPIOs in order to create the SPI port.
> > (Unfortunately, TS does not specify this in their docs.)
> >
> >
> > --- On Wed, 2/24/10, Jongsoo Kim jongsoo.kim@ wrote:
> >
> > From: Jongsoo Kim jongsoo.kim@
> > Subject: [ts-7000] SPI interface on TS7500
> > To:
> > Cc: "'xinping guo'" xinpingguo@
> > Date: Wednesday, February 24, 2010, 5:40 PM
> >
> >
> >
> >
> >
> >
> >
> > Â
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Group
> >
> > Â
> >
> > I am trying to configure SPI interface to use AD converter (
> > AD 7927).
> >
> > I am having some following issue
> >
> > Â
> >
> > 1) generate CS# on DIO#11
> >
> > 2) generalte SPI clk whenver SPI read or write command is
> > issued
> >
> > 3) configure SPI as 16 bits data access
> >
> > 4) need to write to SPI reg#48 to configure the control
> > register (select channel, voltage range, power manager) and then read
> this
> > register to get the AD data.
> >
> > Â
> >
> > Â
> >
> > I would appreciate if someone can advise me.
> >
> > Â
> >
> > Â
> >
> > Thanks
> >
> > Â
> >
> > Jongsoo Kim
> >
> > Â
> >
>
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