Activity
From 02/14/2017 to 03/15/2017
03/15/2017
- JK 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 you suggested, to get started).
I kept the FPGA image in which we connected MOSI to MISO (rather than using the "loop ...
03/14/2017
- JK 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 preventing me from being in the office to try this out today.
Thanks,
Jared
03/13/2017
- MW 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 "hardcore" have a built in loopback mode, so you don't need to physically rewire the FPGA at the top level.
Can you run thi... - I found a problem reading the HPS gpio in uboot.
E.g
03/10/2017
- JK 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 in behavior (still an empty receive buffer). The SCLK and CS lines are still behaving as expected as measured by an osci...
03/09/2017
- JK 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 somehow our MISO signal isn't hooked up correctly in the FPGA (which I'd be surprised by due to another test described ... - MW 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
03/01/2017
- Context:
- Hardware: MitySOM 5CSX board connected to another board containing several chips which communicate via SPI
- Software: the MitySOM processor is running the Altera Linux 4.1.22 LTSI RT kernel with a device tree I've customize...
02/22/2017
- I believe there is a small errata on the [[Mounting_Hole_Locations]] page.
At the bottom it states... "Standoff: McMaster Carr PN - 91115A510" ... This is not an actual part number in McMaster.
I think the last two numbers where switch...