关于imx6ul mcp2515 driver

embed — Mon, 04 Jul 2016 01:14:47 GMT

问题：

使用imx6ul的，添加1路spi can总线芯片mcp2515，内核版本linux-3.14.52. 使用cansend/candump工具测试没有数据收发，以下是我们的电路和配置及log信息，请问有人碰到此类问题吗，能帮忙看一下吗？

1、电路

2、管脚

CS1-->GPIO4_IO28

INT1-->GPIO5_IO02

其他使用ECSPI2管脚

3、DTS配置

...

clocks {

mcp251x_clock: mcp251x_clock {

compatible = "fixed-clock";

#clock-cells = <0>;

clock-frequency = <8000000>;

};

...

};

&ecspi2 {

compatible = "fsl,imx51-ecspi";

fsl,spi-num-chipselects = <1>;

cs-gpios = <0>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_ecspi2>,<&pinctrl_ecspi2_cs>;

status = "okay";

can0: mcp2515@0 {

compatible = "microchip,mcp2515";

cs-gpios = <&gpio4 28 0>;

reg = <0>;

spi-max-frequency = <1000000>;

clocks = <&mcp251x_clock>;

interrupt-parent = <&gpio5>;

interrupts = <2 0x2>;

vdd-supply = <&reg_can_3v3>;

xceiver-supply = <&reg_can_3v3>;

};

&iomuxc{

pinctrl_ecspi2: ecspi2grp{

fsl,pins = <

MX6UL_PAD_CSI_DATA00__ECSPI2_SCLK 0x100b1

MX6UL_PAD_CSI_DATA02__ECSPI2_MOSI 0x100b1

MX6UL_PAD_CSI_DATA03__ECSPI2_MISO 0x100b1

};

pinctrl_ecspi2_cs: ecspi2csgrp {

fsl,pins = <

MX6UL_PAD_CSI_DATA07__GPIO4_IO28 0x80000000

};

4、Linux版本与配置

linux-3.14.52

CONFIG_CAN=y

CONFIG_CAN_RAW=y

CONFIG_CAN_BCM=y

CONFIG_CAN_GW=y

# CAN Device Drivers

CONFIG_CAN_VCAN=y

# CONFIG_CAN_SLCAN is not set

CONFIG_CAN_DEV=y

CONFIG_CAN_CALC_BITTIMING=y

# CONFIG_CAN_LEDS is not set

# CONFIG_CAN_AT91 is not set

# CONFIG_CAN_TI_HECC is not set

CONFIG_CAN_MCP251X=y

CONFIG_CAN_FLEXCAN=y

# CONFIG_CAN_GRCAN is not set

# CONFIG_CAN_M_CAN is not set

# CONFIG_CAN_SJA1000 is not set

# CONFIG_CAN_C_CAN is not set

# CONFIG_CAN_CC770 is not set

5、启动log

启动脚本

/sbin/ifconfig can0 down

/sbin/ifconfig can1 down

/sbin/ifconfig can2 down

/sbin/ifconfig can0 txqueuelen 100

/sbin/ifconfig can1 txqueuelen 100

/sbin/ifconfig can2 txqueuelen 100

/sbin/ip link set can0 up type can bitrate 250000 restart-ms 10

/sbin/ip link set can1 up type can bitrate 250000 restart-ms 10

/sbin/ip link set can2 up type can bitrate 250000 restart-ms 10

log：

...

[ 1.308895] spi_imx 200c000.ecspi: registered master spi1

[ 1.309943] spi spi1.0: spi_imx_setup: mode 0, 8 bpw, 1000000 hz

[ 1.309985] spi spi1.0: setup mode 0, 8 bits/w, 1000000 Hz max --> 0

[ 1.310343] spi_imx 200c000.ecspi: registered child spi1.0

[ 1.310376] spi_imx 200c000.ecspi: probed

[ 1.317230] vcan: Virtual CAN interface driver

[ 1.321717] CAN device driver interface

[ 1.326035] mcp251x spi1.0: spi_imx_setup: mode 0, 8 bpw, 1000000 hz

[ 1.326072] mcp251x spi1.0: setup mode 0, 8 bits/w, 1000000 Hz max --> 0

[ 1.326498] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 1.336678] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 1.336855] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 1.336983] mcp251x spi1.0: CANCTRL 0xe3

[ 1.338271] mcp251x spi1.0: probed

[ 1.344136] flexcan 2090000.can: gpr /soc/aips-bus@02000000/iomuxc-gpr@020e4000 req_gpr 0x10 req_bit 1 ack_gpr 0x10 ack_bit 17

[ 1.344306] flexcan 2090000.can: device registered (reg_base=a0998000, irq=142)

[ 1.353676] flexcan 2094000.can: gpr /soc/aips-bus@02000000/iomuxc-gpr@020e4000 req_gpr 0x10 req_bit 2 ack_gpr 0x10 ack_bit 18

[ 1.353844] flexcan 2094000.can: device registered (reg_base=a09a0000, irq=143)

...

[ 15.479788] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.489946] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.490078] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.490235] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.490364] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.490501] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.490627] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.490756] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.490869] mcp251x spi1.0: CNF: 0x00 0x00 0x00

[ 15.495556] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.495692] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.495824] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.495950] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.496076] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.496205] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.496332] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.496460] mx51_ecspi_clkdiv: fin: 60000000, fspi: 1000000, post: 2, pre: 14

[ 15.509531] flexcan 2090000.can can1: writing ctrl=0x07292005

[ 15.515520] flexcan 2090000.can can1: flexcan_set_bittiming: mcr=0x5980000f ctrl=0x07292005

[ 15.515543] flexcan 2090000.can can1: flexcan_chip_start: writing mcr=0x7de2020d

[ 15.515565] flexcan 2090000.can can1: flexcan_chip_start: writing ctrl=0x0729ac55

[ 15.515602] flexcan 2090000.can can1: flexcan_chip_start: reading mcr=0x64e2020d ctrl=0x0729ac55

[ 15.528534] flexcan 2094000.can can2: writing ctrl=0x07292005

[ 15.534736] flexcan 2094000.can can2: flexcan_set_bittiming: mcr=0x5980000f ctrl=0x07292005

[ 15.534765] flexcan 2094000.can can2: flexcan_chip_start: writing mcr=0x7de2020d

[ 15.534786] flexcan 2094000.can can2: flexcan_chip_start: writing ctrl=0x0729ac55

[ 15.534825] flexcan 2094000.can can2: flexcan_chip_start: reading mcr=0x64e2020d ctrl=0x0729ac55

6、当前问题

查看/sys/class/spi_master/已经注册成功。

使用cansend发送数据失败，接收数据失败。

将DTS配置成

&ecspi2 {

compatible = "fsl,imx51-ecspi";

fsl,spi-num-chipselects = <1>;

cs-gpios = <0>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_ecspi2>,<&pinctrl_ecspi2_cs>;

status = "okay";

spidev@0 {

compatible = "spidev";

spi-max-frequency = <10000000>;

reg = <0>;

};

使用spi_test测试，SPI输出脚有波形。

CAN总线总是不成功，收发都有问题。

是否有人碰到过类似的问题。帮忙解答一下。

Re: 关于imx6ul mcp2515 driver

weidong_sun — Mon, 04 Jul 2016 06:42:31 GMT

Hi,

从log上看，mcp2515已经注册成功了：spi1.0位置上。那么你可以先这样看看：

（1）用netcfg命令，看看can device是否存在。

（2）CPU SPI发数据时，MCP2515的CS脚有没有被拉低。

伟东

Re: 关于imx6ul mcp2515 driver

embed — Mon, 04 Jul 2016 08:24:45 GMT

(1)我没有使用netcfg查看，直接查看了/sys/class/spi_master/spi1/spi1.0/，使用ifconfig 也可以看到已经添加了can的设备，并且使用ip link set can0 up type can bitrate 25000可以配置成功,

(2)发送数据时，片选确定是拉低的，但是spi的mosi没有波形。用can总线收发工具也没有数据

Re: 关于imx6ul mcp2515 driver

weidong_sun — Tue, 05 Jul 2016 03:58:33 GMT

Hi,

你的系统中，SPI to CAN bus经过驱动之后，已经是CAN设备，所以你不能用SPI test去测试它，而是要使用linux提供CAN总线测试命令，可以参考这个链接：

https://community.nxp.com/docs/DOC-1437

如果这个不够详细，你可以在我们论坛上搜索一下其他的帖子。

伟东

Re: 关于imx6ul mcp2515 driver

embed — Wed, 06 Jul 2016 00:56:06 GMT

canutils工具已经移植过去，确实没有数据收发，使用周立功CAN卡，CANTest显示发送失败，板子这端发送也是不成功。

Re: 关于imx6ul mcp2515 driver

embed — Fri, 23 Sep 2016 07:33:26 GMT

还是驱动程序的问题，目前已经解决。驱动程序可以使用https://github.com/msperl/mcp2515/blob/master/mcp2515.c

Re: 关于imx6ul mcp2515 driver

xswyzao — Fri, 14 Oct 2016 09:40:06 GMT

我们也用imx6接的mcp2515,直接用的是4.1.15内核，是可以正常收发的。

Re: 关于imx6ul mcp2515 driver

zhangxinxing — Tue, 11 Sep 2018 03:10:13 GMT

你好，请教一下。我现在按照这个楼主这个做法做了，能在/sys/class/spi_master看到新增了一个SPI设备，但在/sys/class/net下面还是只有can0和can1（看不到预想的can2设备）。请问下可能是什么问题？另外上面的硬件接法中，INT引脚必须要接上吗？不接有啥影响？

Re: 关于imx6ul mcp2515 driver

zhangxinxing — Tue, 11 Sep 2018 03:13:29 GMT

Re: 关于imx6ul mcp2515 driver

lphwork — Wed, 18 Dec 2019 07:39:37 GMT

请问你的dts是怎么配置的，我这边是spi4改出来的，但是spi的clk没有波形呢，请指导一下我吧，谢谢你了！lphwork@aliyun.com我的邮箱，或者给我你的联系方式也可以。

Re: 关于imx6ul mcp2515 driver

FGBLH — Mon, 22 Mar 2021 03:32:31 GMT

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