Hello,
I've got a problem with my BeagleBone Black. I am using Debian 7.9 with the
3.8.13-bone70 kernel and the stock can-utils which were delivered with my
BBB rev C.
I try to use the CAN interface on pin P9.24 and P9.26 to communicate with
a given counterpart.
Now the problem: Everytime I try to send on the BUS via cangen or cansend
in normal mode, it throws the following error or warning:
*write: No buffer space available*
If I try to send in *loopback mode*, it works fine. In this case, candump
is able to receive the frames and CANAlyzer and my Oscilloscope show the
outgoing frames on the tx pin too.
Additionally, I am not able to receive anything over the CAN when I try to
send something from CANAlyzer to my BBB (with *loopback mode* disabled).
Even in* listen-only mode,* it isnt possible to receive anything.
Is there anyone who experienced a similar problem or could give me a hint?
This is my devicetree-overlay:
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "BB-DCAN1";
version = "00A0";
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P9.26", /* dcan1: dcan1_tx */
"P9.24", /* dcan1: dcan1_rx */
/* the hardware ip uses */
"dcan1";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
bb_dcan1_pins: pinmux_bb_dcan1_pins {
pinctrl-single,pins = <
0x180 0x12 /* P9.26 uart1_rxd.can1_tx INPUT_PULLUP |
MODE2 */
0x184 0x32 /* P9.24 uart1_txd.dcan1_rx RECV_ENABLE |
INPUT_PULLUP | MODE2 */
>;
};
};
};
fragment@1 {
target = <&dcan1>;
__overlay__ {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bb_dcan1_pins>;
};
};
};
Best Regards
Fabian
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