Hi I have tried to get the mcp251x driver to work with the Overo
Gumstix for sometime now.
I finally got the driver and the SPI communication to work with kernel
2.6.31 and was thereafter able to use iproute to initiate the bitrate,
which didn't work with previous kernel versions. But I still can't see
any data sent or received on the can0 interface. I have inserted print
statements in the module to be able to debug it but I'm still stuck.
If someone could point me in the right direction it would be highly
appreciated. I'm running the modules from SVN rev 1064.
Below is a capture of the initiation of the module and can0:
---
r...@overo:~# modprobe mcp251x
CAN device driver interface
Running: mcp251x_can_probe
Running: mcp251x_setup
ret 0
Running: mcp251x_hw_probe
Running: mcp251x_hw_reset
Running: mcp251x_read_reg(*spi,reg=14)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 128
Running: mcp251x_read_reg(*spi,reg=15)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 135
Running: mcp251x_hw_sleep
Running: mcp251x_write_reg(*spi,reg=15,val=32)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
mcp251x spi1.0: probed
r...@overo:~#
Setting the bitrate, my oscillator frequence is set to 20000000
r...@overo:~# ip link set can0 type can bitrate 250000
Running: mcp251x_do_set_bittiming
Running: mcp251x_read_reg(*spi,reg=15)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 96
Running: mcp251x_read_reg(*spi,reg=14)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 32
Running: mcp251x_write_bits(*spi,reg=15,mask=224,val=128)
Running: mcp251x_spi_trans(*spi,len=4)
return: 0
Running: mcp251x_write_reg(*spi,reg=42,val=1)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
Running: mcp251x_write_reg(*spi,reg=41,val=191)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
Running: mcp251x_write_bits(*spi,reg=40,mask=7,val=2)
Running: mcp251x_spi_trans(*spi,len=4)
return: 0
Running: mcp251x_write_bits(*spi,reg=15,mask=224,val=32)
Running: mcp251x_spi_trans(*spi,len=4)
return: 0
r...@overo:~#
r...@overo:~# ifconfig can0 up
Running: mcp251x_open
enable irq=274
Running: mcp251x_wakeup
Running: mcp251x_write_bits(*spi,reg=43,mask=64,val=64)
Running: mcp251x_spi_trans(*spi,len=4)
return: 0
Running: mcp251x_write_bits(*spi,reg=44,mask=64,val=64)
Running: mcp251x_spi_trans(*spi,len=4)
Running: mcp251x_can_isr
Running: mcp251x_irq_work_handler
while(!priv->force_quit && !freezing(current))
Running: mcp251x_read_reg(*spi,reg=44)
return: 0
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 64
Running: mcp251x_write_bits(*spi,reg=44,mask=64,val=0)
Running: mcp251x_spi_trans(*spi,len=4)
return: 0
while(!priv->force_quit && !freezing(current))
Running: mcp251x_read_reg(*spi,reg=44)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 0
Running: mcp251x_read_reg(*spi,reg=14)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 96
Running: mcp251x_hw_reset
Running: mcp251x_setup
Running: mcp251x_write_bits(*spi,reg=96,mask=100,val=100)
Running: mcp251x_spi_trans(*spi,len=4)
return: 0
Running: mcp251x_write_bits(*spi,reg=112,mask=96,val=96)
Running: mcp251x_spi_trans(*spi,len=4)
return: 0
Running: mcp251x_set_normal_mode
Running: mcp251x_write_reg(*spi,reg=43,val=63)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
Running: mcp251x_write_reg(*spi,reg=15,val=0)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
Running: mcp251x_read_reg(*spi,reg=14)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 0
r...@overo:~#
r...@overo:~# cansend can0 000#
can: controller area network core (rev 20090105 abi 8)
NET: Registered protocol family 29
can: raw protocol (rev 20090105)
Running: mcp251x_hard_start_xmit
Running: mcp251x_tx_work_handler
Running: mcp251x_hw_tx
Running: mcp251x_write_reg(*spi,reg=49,val=0)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
Running: mcp251x_write_reg(*spi,reg=50,val=0)
Running: mcp251x_spi_trans(*spi,len=3)r...@overo:~#
return: 0
Running: mcp251x_write_reg(*spi,reg=51,val=0)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
Running: mcp251x_write_reg(*spi,reg=52,val=0)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
Running: mcp251x_write_reg(*spi,reg=53,val=0)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
Running: mcp251x_write_reg(*spi,reg=48,val=8)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
r...@overo:~# ifconfig
can0 Link encap:UNSPEC HWaddr
00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
UP RUNNING NOARP MTU:16 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
r...@overo:~#
As soon as I connect the other CAN devices I get this output:
[...]
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 31
Running: mcp251x_write_reg(*spi,reg=45,val=0)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
while(!priv->force_quit && !freezing(current))
Running: mcp251x_read_reg(*spi,reg=44)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 128
Running: mcp251x_write_bits(*spi,reg=44,mask=128,val=0)
Running: mcp251x_spi_trans(*spi,len=4)
return: 0
Running: mcp251x_read_reg(*spi,reg=48)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 16
------------[ cut here ]------------
WARNING: at
/home/plejd/overo-oe/tmp/work/overo-angstrom-linux-gnueabi/socketcan-modules-0.0+svnr1064-r45/trunk/kernel/2.6/drivers/net/can/mcp251x.c:840
mcp251x_irq_work_handler+0x24c/0x5d0 [mcp251x]()
Modules linked in: can_raw can ipv6 mcp251x can_dev
[<c00f45d4>] (unwind_backtrace+0x0/0xdc) from [<c0116288>]
(warn_slowpath_common+0x4c/0x80)
[<c0116288>] (warn_slowpath_common+0x4c/0x80) from [<bf009040>]
(mcp251x_irq_work_handler+0x24c/0x5d0 [mcp251x])
[<bf009040>] (mcp251x_irq_work_handler+0x24c/0x5d0 [mcp251x]) from
[<c0126d2c>] (worker_thread+0x19c/0x218)
[<c0126d2c>] (worker_thread+0x19c/0x218) from [<c012a6c0>] (kthread+0x78/0x80)
[<c012a6c0>] (kthread+0x78/0x80) from [<c00f0800>] (kernel_thread_exit+0x0/0x8)
---[ end trace 2c66beb10b4a4a3e ]---
while(!priv->force_quit && !freezing(current))
Running: mcp251x_read_reg(*spi,reg=44)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 0
Running: mcp251x_read_reg(*spi,reg=14)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 0
Running: mcp251x_irq_work_handler
while(!priv->force_quit && !freezing(current))
Running: mcp251x_read_reg(*spi,reg=44)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 0
Running: mcp251x_read_reg(*spi,reg=14)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 0
If I try to send anything while having other nodes connected the
driver doesn't get out from the while loop in the irq_handler:
r...@overo:~# cansend can0 000#
[...]
while(!priv->force_quit && !freezing(current))
Running: mcp251x_read_reg(*spi,reg=44)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 128
Running: mcp251x_write_bits(*spi,reg=44,mask=128,val=0)
Running: mcp251x_spi_trans(*spi,len=4)
return: 0
Running: mcp251x_read_reg(*spi,reg=48)
Running: mcp251x_spi_trans(*spi,len=3)
return: 0
return: 24
while(!priv->force_quit && !freezing(current))
[...]
Hope someone can give me some pointers of how to get the communication going.
Kindest regards,
//Erik
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