Mity CPU Platforms » MitySOM-5CSX Altera Cyclone V

03/21/2017

07:21 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Im thinking it's related to the preloader. The preloader is the one who does all the pin muxing for the HPS periphera... Daniel Vincelette

07:06 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Hello Dan,
When re-building an SD card image using my kernel (uImage), the DTB you attached, and the FPGA image (.... Jared Kirschner

04:19 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

I've attached my preloader/uboot/fpga image.
I've also attached the spi_test c++ code I was working with, I've rem... Daniel Vincelette

03:00 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Hello Dan,
I replaced the uImage on my SD card (at /boot) with the uImage I sent you (to ensure it's the same as w... Jared Kirschner

02:07 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

I've tried your kernel and the RX buffer is still working. I couldn't get uboot to actually boot your device-tree, I ... Daniel Vincelette

12:29 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

I've tried it with our 3.16 kernel and Altera's 4.1.22 and 4.1.22 RT kernel. All get data on the RX side. I'll try yo... Daniel Vincelette

12:26 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Hello Dan,
I've attached the requested files (Linux 4.1.22 LTSI RT branch compiled into "uImage" with defconfig "s... Jared Kirschner

12:41 AM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Hi Jared,
Unluckily I wasn't able to recreate the issue you are seeing. My RX buffer has the expected 0x8330 inste... Daniel Vincelette

03/20/2017

07:53 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Hi Jared,
I'm in the middle of recreating your test with one of our dev kits. I'll connect up the MOSI to the MISO... Daniel Vincelette

03/15/2017

01:47 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Hello Mike,
I modified the SPI device tree entry to have an "spi-max-frequency" of 1 MHz (a slow clock speed, as y... Jared Kirschner

03/14/2017

12:44 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Hello Mike,
I just saw this message, and will try it out first thing tomorrow. Unfortunately, a snow storm is prev... Jared Kirschner

03/13/2017

05:20 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Here is some example code from the linux kernel documentation area.
BTW: our FPGA driver and the SPI HPS "hardc... Michael Williamson

02:52 PM Software Development: u-boot bug reading gpio

I found a problem reading the HPS gpio in uboot.
E.g ... Chris Ward

03/10/2017

05:34 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Hello Mike,
We've since conducted a loopback test (MOSI connected to MISO within the FPGA) and observed no change ... Jared Kirschner

03/09/2017

08:28 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Are you referring to modifying the FPGA such that MOSI is connected to MISO?
If that works, it might indicate that... Jared Kirschner

06:43 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Have you tried using the Loopback option to see if you can just loop back the command data and if RX is OK?
-Mike
... Michael Williamson