Hey everybody! Hopefully a few simple questions some more experienced users
can answer. I am attempting to read and send can CAN using the DCAN1_RX and
DCAN1_TX modes for pins P9_24 and P9_26. Here is the step by step of what I
do.
1. Echo the device tree overlay to /sys/devices/bone_capemgr.9/slots (shown
below)
2. I then attempt to set up CAN interface with the following line of code:
ip link set can1 type can bitrate 500000
This gives me a response "cannot find device "can1"" yet when I switch can1
to can0 in the code above, it is successful in configuring the CAN
interface. So is the CAN interface on pins P9_24 and P9_26 supposed to be
DCAN0 and not DCAN1?
My second question regards what I have seen in other posts. Many posts have
said you need to reconfigure the kernel to get DCAN working on the
beaglebone
(http://processors.wiki.ti.com/index.php/AM335X_DCAN_Driver_Guide#Detailed_Kernel_Configuration).
Why is this necessary? Isn't a device tree overlay sufficient?
I am running Debian Image 2014-04-23 and the kernel is 3.8.13-bone47.
Thanks for any help (ps I will be gone for a day or two so I won't be able
to respond to any questions you may have for me until then).
BB-DCAN1.dts
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "dcan1pinmux";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
dcan1_pins_s0: dcan1_pins_s0 {
pinctrl-single,pins = <
0x180 0x12 /* P9_26 DCAN1_TX, SLEWCTRL_FAST |
OUTPUT_PULLUP | MODE2 */
0x184 0x32 /* P9_24 DCAN1_RX, SLEWCTRL_FAST |
INPUT_PULLUP | MODE2 */
>;
};
};
};
fragment@1 {
target = <&dcan1>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&dcan1_pins_s0>;
};
};
};
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