Mity CPU Platforms » MitySOM-335x (ARM Cortex-A8 Based Products)

02/01/2016

10:49 AM Software Development: RE: Spidev issues

Fred, I'm not sure what is wrong. Perhaps if you sent us your schematic someone could look it over.
I'm pretty su... Jonathan Cormier

01/29/2016

03:08 PM Software Development: RE: Spidev issues

A single IOCTL call with len=4 returns 4 bytes of 0 value instead of 2 with no difference in the SPI signals. Fred Frantz

12:04 PM Software Development: RE: Spidev issues

I believe you want a single IOCTL. See the attached source code duplex method.
Example usage... Jonathan Cormier

11:51 AM Software Development: RE: Spidev issues

Correction in above code
fd = open(devname, O_RDWR|O_SYNC);
should be
fd = open(devname, O_RDWR); Fred Frantz

11:49 AM Software Development: RE: Spidev issues

This is based on spidev_test.c and other examples. There are two devices on the bus that have to be configured to re... Fred Frantz

11:06 AM Software Development: RE: Spidev issues

Fred Frantz wrote:
> Yes, I am looking at all the SPI0 signals on a scope, and they are correct. The transmitted da... Jonathan Cormier

11:02 AM Software Development: RE: Spidev issues

Yes, I am looking at all the SPI0 signals on a scope, and they are correct. The transmitted data is configuring the ... Fred Frantz

10:44 AM Software Development: RE: Spidev issues

Fred Frantz wrote:
> The data is now being clocked out correctly, and the device is responding with the correct da... Jonathan Cormier

10:42 AM Software Development: RE: Spidev issues

Fred Frantz wrote:
> Mike, are you referring to the .d0_is_mosi parameter in the ompa2_mcspi_device_config structure... Jonathan Cormier

10:36 AM Software Development: RE: Spidev issues

Mike, are you referring to the .d0_is_mosi parameter in the ompa2_mcspi_device_config structure? That is set to 1, b... Fred Frantz

01/28/2016

12:12 PM Software Development: RE: Spidev issues

I think there is also a control for the McSPI that can swap the din / dout pins between "d0" and "d1". We had troubl... Michael Williamson

12:06 PM Software Development: RE: Spidev issues

Fred Frantz wrote:
> Thanks for the correction. Setting the .bus_num = 1 solved the module issue, and the .controlle... Jonathan Cormier

11:59 AM Software Development: RE: Spidev issues

Thanks for the correction. Setting the .bus_num = 1 solved the module issue, and the .controller_data information is ... Fred Frantz

01/26/2016

05:02 PM Software Development: RE: Spidev issues

Fred Frantz wrote:
> After erasing the NAND, the ECC errors are resolved. Thanks, that was a self inflicted problem ... Jonathan Cormier

04:54 PM Software Development: RE: Spidev issues

Michael Williamson wrote:
> SPIDEV sits on top of McSPI. It's an abstraction layer on top of the specific SPI drive... Jonathan Cormier

03:49 PM Software Development: RE: Spidev issues

SPIDEV sits on top of McSPI. It's an abstraction layer on top of the specific SPI driver. That may be the problem.
... Michael Williamson

03:36 PM Software Development: RE: Spidev issues

After erasing the NAND, the ECC errors are resolved. Thanks, that was a self inflicted problem due to misinterpretati... Fred Frantz

11:44 AM Software Development: RE: Spidev issues

Jonathan Cormier wrote:
> For your case you just need to erase the kernel section.
> @nand erase 0x340000 0x50000... Jonathan Cormier

11:43 AM Software Development: RE: Spidev issues

> U-Boot# tftp 0x82000000 $serverip:uImage
> U-Boot# nand write.i 0x82000000 0x340000 $filesize
> No errors are rep... Jonathan Cormier

11:17 AM Software Development: RE: Spidev issues

The kernel and environment were reloaded just to get to a known point where everything was working previously. The k... Fred Frantz

10:39 AM Software Development: RE: Spidev issues

Just checked and the 0x340000 address the ECC errors mention is the location of the kernel not the environment I init... Jonathan Cormier

09:35 AM Software Development: RE: Spidev issues

Fred Frantz wrote:
> Thanks for the suggestions, but ZCAT on the target indicates that SPIDEV is enabled.
Interes... Jonathan Cormier

09:13 AM Software Development: RE: Spidev issues

Thanks for the suggestions, but ZCAT on the target indicates that SPIDEV is enabled. Regarding the ECC errors, I rel... Fred Frantz

01/25/2016

05:33 PM Software Development: RE: Spidev issues

Hmm no noticeable errors. You can double check the kernel, on the booted device for the spidev support:... Jonathan Cormier

04:21 PM Software Development: RE: Spidev issues

I added the boot log for the ECC errors also. Fred Frantz

03:39 PM Software Development: RE: Spidev issues

Hope this helps. Fred Frantz

03:15 PM Software Development: RE: Spidev issues

Can you attach the bootlog for the device? Jonathan Cormier

03:09 PM Software Development: RE: Spidev issues

It looks like it is enabled to me.
... Fred Frantz

01:41 PM Software Development: RE: Spidev issues

A pinmux conflict would likely cause the device not to work but it would not affect the creation of the spidev device... Jonathan Cormier

01:33 PM Software Development: Spidev issues

The dev kit baseboard file has been modified to include a "spidev" device, and the kernel was compiled to include the... Fred Frantz