Banana Pi + Enc28j60 (SPI Interface)

n3m

Hi!
I am trying to get an ENC28j60 running with the BananaPi.

Interface -> GPIO:

1. VCC -> 3,3v
   
2. GND -> GND
   
3. CS -> CE0
   
4. SI -> MOSI
   
5. SCK -> SCKL
   
6. SO -> MISO
   
7. INT -> GPIO25

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I tested it with a kernel compiled spi_sun7i as module and within kernel. Both did not work when i enabled the module for enc28j60.

1. modprobe spi_sun7i;modprobe spidev;modprobe enc28j60

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I got this module running with a standard rpi by modifying the bmc2708 sources to properly identify the interrupt for this module.
Loading the enc28j60 module resulted in a slow(10mbit) but working ifdevice eth1
Unfortunately I did not find any option @sources to configure static devices with the sun7i... the interrupt won't get recognized even if I use spi-config to load the module for enc28j60. Before I needed to configure the falling edge for the interrupt of this spi device.

1. echo "25" > /sys/class/gpio/export;echo "falling" > /sys/class/gpio25/edge;echo "25" > /sys/class/gpio/unexport
   
2. modprobe spi-config devices=bus=0:cs=0:modalias=enc28j60:speed=100000000:gpioirq=25

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Any suggestions how I make this module work for sun7i ?

tony_zhang

I don't understand clearly what you mean. Did you mean you want to change the clk frequency of spi?

n3m

I just want a working additional eth device. The module gets loaded successfully  but there is will not a eth device be created.

tony_zhang

Reply 3# n3m

But this part code is for what:

1. echo "25" > /sys/class/gpio/export;echo "falling" > /sys/class/gpio25/edge;echo "25" > /sys/class/gpio/unexportmodprobe spi-config devices=bus=0:cs=0:modalias=enc28j60:speed=100000000:gpioirq=25

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sashijoseph

Tony,I think it is to setup GPIO25(CON3 pin22 ???) as an external interrupt pin.This would be used by the ENC chip for some signalling stuff.
So I think it boils down to how to configure the particular GPIO pin as an external interrupt pin triggered by a falling edge.

Is this correct n3m?

tony_zhang

echo "falling" > /sys/class/gpio25/edge;

This just configure the pin to the external interrupt function. You also need input a interrupt to active it.

You follow this line echo "25" > /sys/class/gpio/unexport .  I do not no the reason why you disable it again.

n3m

@sashjoseph correct.
@tony well this is working with a standard pi to get the enc up and running with 10MHz.
Bananapi will not recognize the enc if the module is loaded - this is the main problem here.
How can I get the ENC working with the sun7i?

sashijoseph

Well with RPi you were using the spi-config module to pass spi information to the enc28j60.
Unfortunately spi-config is not available on the BPi.

So you must configure it in the fex file.
Edit the Fex file to reflect these changes...

1. [spi_devices]
   
2. spi_dev_num = 1
   
3. 
   
4. [spi_board0]
   
5. modalias = "enc28j60"
   
6. max_speed_hz = 10000000
   
7. bus_num = 0
   
8. chip_select = 0
   
9. mode = 0
   
10. full_duplex = 0
    
11. manual_cs = 0
    
12. irq_gpio = 1
    
13. 
    
14. [gpio_para]
    
15. gpio_used = 1
    
16. gpio_num = 1
    
17. gpio_pin_1 = port:PI16<5><default><default><default>

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Also remove the [spi_board1] section and it's contents.
Now try modprobing the ENC module and check dmesg for any errors etc

julie20082004

Reply 1# n3m


pin 25 is connet to GND

n3m

Reply 9# julie20082004
well I am using pin 22 for irq this equals GPIO25 see

Reply 8# sashijoseph
I were not able to locate the .fex file you were writing about. Where is it located?
If you want to install spi-config @ a bpi:

1. git clone https://github.com/mspecl/spi-config
   
2. cd spi-config
   
3. make && make install && depmod

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