Hello,

 

I am trying to switch from an older wheezy (lemaker) install to a newer Armbian Jessie install, (5.14 Armbian).By using the Legacy Kernel I can load ft5x drivers for the 5" PCAP Screen.

So Far, everything is working normally except much faster and reliable.

 

My Problem is that I can't read the analog voltage from my MCP3002 anymore using spidev python module.

 

I have spidev and spi-sun7i in  /etc/modules

ls /dev/spi*
 
/dev/spidev0.0
/dev/spidev0.1
 
dmesg | grep spi
 
[    1.202344] [spi-inf] Found 2 spi devices in config files
[    1.209170] [spi-inf] boards num modalias         max_spd_hz       bus_num  cs   mode
[    1.212928] [spi-inf] spi_board0 irq gpio not used
[    1.219895] [spi-inf] 0          spidev           12000000         0        0    0x3   
[    1.223651] [spi-inf] spi_board1 irq gpio not used
[    1.230615] [spi-inf] 1          spidev           12000000         0        1    0x3   
[    1.234711] [spi-inf] sun7i_spi_probe: sun7i spi probe
[    1.239335] [spi-inf] sun7i_spi_probe: spi0 dma type: normal
[    1.242909] [spi-inf] bus num = 0, spi used = 3
[    1.247368] [spi-inf] sun7i_spi_probe: spi0 cs bitmap: 0x3
[    1.255945] [spi-inf] sun7i_spi_set_mclk: spi0 source = sdram_pll_p, src_clk = 432000000, mclk 86400000
[    1.261869] sun7i-spi sun7i-spi.0: master is unqueued, this is deprecated
[    1.268004] [spi-inf] sun7i_spi_setup: enter, bpw: 8, mshz: 12000000, mode: 3
[    1.274193] [spi-inf] sun7i_spi_setup: enter, bpw: 8, mshz: 12000000, mode: 3
[    1.282984] [spi-inf] sun7i_spi_probe: reuuimlla's SoC SPI Driver loaded for Bus SPI0 with 2 Slaves at most
[    1.292384] [spi-inf] sun7i_spi_probe: spi0 driver probe succeed, base f051c000, irq 42, dma_id_rx 24, dma_id_tx 24

If I try to use wiringPI:

gpio load spi
 
gpio: Unable to load spi-sun7i

I've simplified my mcp3002 code to reproduce the error.

import spidev
s = spidev.SpiDev(0,0)
s.max_speed_hz = 12000000
reply = s.xfer2([160, 0])
 
-------~>
 
    reply = s.xfer2([160, 0])
IOError: [Errno 22] Invalid argument

However, the Exact same hardware Config on wheezy (3.4.103+) results in:

import spidev
 
s = spidev.SpiDev(0,0)
s.max_speed_hz = 12000000
reply = s.xfer2([160, 0])
 
[0, 2]

Anyone have an idea about why I keep getting the Invalid Argument? On the wheezy build, 3.4.103+ this code is functioning.

SPI is build in and it's working (to some degree, apparently). I forgot details, but as far as I remember, there were two patches around so I guess the easiest way would be to rebuild a kernel with that other patch, not with our default one. 

 

Both things (display, SPI) might also be achievable with some tweaking on Vanilla kernel ...

Thanks Igor, I had a similar feeling. If you can remember the other patch let me know. I'm hunting for it now.

 

I will definitely try again on Vanilla Kernel, I am switching hardware soon in the next version of my project, and want to start with a different pcap display anyway.