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