FPGA connection

[유창 김]

I want to communicate OMAP and Cyclone IV FPGA through GPMC.

Is there any driver for GPMC module in OMAP?

Or do I have to write new driver for FPGA?


And in exapnsion connector in Pandaboard,

there are no pins for gpmc_a[25:16]...

So we must use NAND configuration??


Please help me....

[prpplague]

see this thread:

http://groups.google.com/group/pandaboard/browse_thread/thread/fb037428dd112128/2239178d2f9be5a8

[유창 김]

In that post, I can't find any useful information.

If I connect FPGA with 16-bit NAND configuration,

What should I do to access FPGA in OMAP4. (Ubuntu 11.04)

Do I have to configure Ubuntu kernel?

How I can use gpmc-nand.c file to communication?


On 7월10일, 오전2시20분, prpplague <dave123...@yahoo.com> wrote:
> see this thread:
>
> http://groups.google.com/group/pandaboard/browse_thread/thread/fb0374...

>
> On Jul 8, 11:32 pm, 유창 김 <noco3...@gmail.com> wrote:
>
>
>
> > I want to communicate OMAP and Cyclone IV FPGA through GPMC.
>
> > Is there any driver for GPMC module in OMAP?
>
> > Or do I have to write new driver for FPGA?
>
> > And in exapnsion connector in Pandaboard,
>
> > there are no pins for gpmc_a[25:16]...
>
> > So we must use NAND configuration??
>

> > Please help me....- 원본 텍스트 숨기기 -
>
> - 원본 텍스트 보기 -

[prpplague]

yes you have to configure the kernel.

you have to add support for gpmc nand.

gpmc-nand.c is the gpmc nand driver for omap3 and omap4.

look at the board-overo.c file for an example of adding a gpmc driver.

Dave

[Mickey]

If I want to use 16-bit Address/Data-Multiplexed Memory,

What file do I have to see?

And do I have to add codes in board-omap4panda.c?? or edit in
menuconfig of kernel??

It's too hard...

[Vladimir Pantelic]

On Jul 11, 3:58 am, Mickey <noco3...@gmail.com> wrote:
> If I want to use 16-bit Address/Data-Multiplexed Memory,
>
> What file do I have to see?
>
> And do I have to add codes in board-omap4panda.c?? or edit in
> menuconfig of kernel??
>
> It's too hard...

In that case you should consider a different project or invest more
time into learning some (embedded) Linux basics.

[Mickey]

You means that I have to write new driver?

[prpplague]

if your fgpa communicates as a 16-bit nand device, use gpmc-nand.c

Dave

[Mickey]

how can i use gpmc-nand.c for communication?

please explain more...

[Dennis]

Mickey,
have you find out how to? can you share with me? I know the files reside arch/arm/mach-omap2/ but I dont see where I can enable it on menuconfig.

[Tom Mitchell]

Not sure.... tell us more about the FPGA and the board it

is mounted on.    In general a FPGA needs a lot of work

to present itself as a functioning USB device.  Then USB devices

are complex targets so one size does not fit all.

Give this a look and note how the two processors parts work together

to permit access to the target device for development purposes.

      http://blogs.freescale.com/2012/07/27/the-freedom-board/

Also note the bits on how USB driver software is often needed on the development

system.   A FPGA is not going to look like a USB memory device

unless the FPGA card has the built in property of looking like 

a memory device to permit FPGA images to be downloaded to it

and then shifted in on reset.

Yet other devices are JTAG managed and that is another project

that often involves level matching/shifting hardware and the use of GPIO

pins for input and output.

Most FPGA development cards have software support and device conventions

to make them work.    Some contain DSP resources and memory interfaces

that need care and feeding.   The faster and larger FPGA cost a lot more than the

Panda board.... The FPGA development tools may establish the foundations

of your bootstrap process.

Way too many unknowns to solve this equation.

On Sat, Oct 20, 2012 at 10:18 AM, <matteo...@gmail.com> wrote:

Hello everybody!

Is it possible to interconnect a Pandaboard to a FPGA using USB? If yes, what operations must be performed to connect the two boards?
Thank you

Matteo

--
  T o m   M i t c h e l l

[Bharathi Subramanian]

On Sun, Oct 21, 2012 at 1:18 AM, <matteo...@gmail.com> wrote:

> Is it possible to interconnect a Pandaboard to a FPGA using USB? If yes,
> what operations must be performed to connect the two boards?

Yes. There are many FPGA comes with USB interface. So you can simply
interconnect it with Pandaboard. Major issue with USB is speed, when I
tried with entry level Spartan board, unable to go beyond 25MBps
bi-directional. YMMV.

If you are looking higher speed, GPMC is best one. Unfortunately in
panda, the A&D lines are muxed and it may impose some limit on the
speed.

Bye :)
--
Bharathi Subramanian

[ahafne...@gmail.com]

I try to interface an FPGA with the OMAP4 using the GPMC in synchronous burst mode.
The FPGA acts like an FIFO which triggers just on the GPMC_CLK and GPMC_CS signals and outputs the data on the 16Bit GPMC_AD bus.
The GPMC is configured in non-multiplexed 16Bit NOR Flash mode. To enable the burst mode of the GPMC a DMA is used. The kernel code below shows the DMA configuration.


    ret=omap_request_dma(OMAP44XX_DMA_GPMC,"dma",dma_callback,NULL,&spartan_dma.transfer_id);

    omap_set_dma_transfer_params(spartan_dma.transfer_id,
                  OMAP_DMA_DATA_TYPE_S16,
                  spartan_dma.buffers.buf_size / 2,
                  1,
                  OMAP_DMA_SYNC_ELEMENT,
                  0,
                  0);

       omap_set_dma_src_params(
                  spartan_dma.transfer_id,0,OMAP_DMA_AMODE_POST_INC,
                  cs_mem_base,1,1);

    omap_set_dma_dest_params(
                   spartan_dma.transfer_id,0,OMAP_DMA_AMODE_POST_INC,
                   spartan_dma.buffers.ping_buf_phys,1,1);

       omap_set_dma_src_burst_mode(
                  spartan_dma.transfer_id,OMAP_DMA_DATA_BURST_16 );


       omap_set_dma_dest_burst_mode(
                  spartan_dma.transfer_id,OMAP_DMA_DATA_BURST_16  );

      omap_set_dma_dest_data_pack(spartan_dma.transfer_id,1);
      omap_set_dma_src_data_pack(spartan_dma.transfer_id,1);

       omap_dma_set_global_params(
                  0x1, 0x20,DMA_THREAD_RESERVE_THREET);
       omap_dma_set_prio_lch(
                  spartan_dma.transfer_id,DMA_CH_PRIO_HIGH,DMA_CH_PRIO_HIGH);

        omap_start_dma(spartan_dma.transfer_id);


DMA Register content:

[159908.133087] REVISION:10900
[159908.137329] IRQSTATUS_L3:f
[159908.140319] IRQENABLE_L3:0
[159908.145416] SYSSTATUS:1
[159908.148132] CAPS_0:1c0000
[159908.153076] CAPS_1:10900
[159908.155883] CAPS_2:1ff
[159908.160461] CAPS_3:f3
[159908.163024] CAPS_4:7ffe
[159908.167663] GCR:10020
[159908.170196] CCR:4005040
[159908.174865] CLNK_CTRL:0
[159908.177612] CICR:922
[159908.180053] CSR:0
[159908.184844] CSDP:e1c1
[159908.187377] CEN:200
[159908.191589] CFN:1
[159908.193756] CSSA:1000000
[159908.198455] CDSA:aaa2c800
[159908.201354] CSEI:1
[159908.203613] CSFI:1
[159908.208557] CDEI:1
[159908.210815] CDFI:1
[159908.214874] CSAC:1000400
[159908.217681] CDAC:aaa2ac00
[159908.222778] CCEN:200
[159908.225219] CCFN:0
[159908.229309] COLOR:0
[159908.231689] CDP:0
[159908.233825] CNDP:0
[159908.238616] CCDN:0

The GPMC is configured as following

159782.092132] GPMC_SYSCONFIG :0
[159782.096313] GPMC_REVISION   :60
[159782.099792] GPMC_SYSSTATUS  :1
[159782.104827] GPMC_IRQSTATUS  :0
[159782.108184] GPMC_IRQENABLE:0
[159782.113128] GPMC_TIMEOUT_CONTROL:0
[159782.116882] GPMC_ERR_ADDRESS:0
[159782.121948] GPMC_ERR_TYPE:0
[159782.125061] GPMC_CONFIG:2
[159782.129364] GPMC_STATUS:901
[159782.132446] GPMC_CS_CONFIG1:79001013
[159782.138061] GPMC_CS_CONFIG2:a0a00
[159782.142700] GPMC_CS_CONFIG3:0
[159782.145965] GPMC_CS_CONFIG4:10056a12
[159782.151611] GPMC_CS_CONFIG5:808110b
[159782.155426] GPMC_CS_CONFIG6:8f070f8f
[159782.161224] GPMC_CS_CONFIG7:f41


The OMAP mux is configured the following:

cd /sys/kernel/debug/omap_mux
sudo echo 0x100 > gpmc_ad0
sudo echo 0x100 > gpmc_ad1
sudo echo 0x100 > gpmc_ad2
sudo echo 0x100 > gpmc_ad3
sudo echo 0x100 > gpmc_ad4
sudo echo 0x100 > gpmc_ad5
sudo echo 0x100 > gpmc_ad6
sudo echo 0x100 > gpmc_ad7
sudo echo 0x100 > gpmc_ad8
sudo echo 0x100 > gpmc_ad9
sudo echo 0x100 > gpmc_ad10
sudo echo 0x100 > gpmc_ad11
sudo echo 0x100 > gpmc_ad12
sudo echo 0x100 > gpmc_ad13
sudo echo 0x100 > gpmc_ad14
sudo echo 0x100 > gpmc_ad15
sudo echo 0x100 > gpmc_clk
sudo echo 0x100 > gpmc_nadv_ale
sudo echo 0x100 > gpmc_nbe0_cle
sudo echo 0x000 > gpmc_ncs0
sudo echo 0x000 > gpmc_ncs1
sudo echo 0x100 > gpmc_nwp
sudo echo 0x100 > gpmc_wait0
sudo echo 0x100 > gpmc_nwe
sudo echo 0x100 > gpmc_noe

But unfortunately sometimes the GPMC_CLK and GPMC_CS signals stops working during individual bursts (see figure below)
(the internal GPMC clock is 200 Mhz, using an prescaller of 4 , GPMC_CLK is 50Mhz)

Pic1

Zoom in:
Pic2

For me this failure looks like it has random occurrence because the bust number on which the failure occurred is always different.

Using the scope, the GPMC_CLK looks like this if no failure happens (1.8Vpp)
Pic3


and like this if the failure happens
Pic4

Can anybody help me to solve this issue?
For me it looks like the GPMC_CLK pin is somehow wrong configured, but I tried many different configuration without solving the issue.


Best Regards