hongjiujing 发表于 2011-11-1 10:49:47

s3c6410 Can Bus

Kernel:2.6.29
Soc:s3c6410
Can:mcp2515
Can driver:SocketCan
Can utils :cansend/canreceive/candump


现象:bus off

debug:
# ./ip link set can0 type can bitrate 125000 triple-sampl
ing on
# ifconfig can0 up

mcp251x_read_reg

mcp251x_spi_trans

mcp251x_write_reg

mcp251x_spi_trans

mcp251x_write_reg

mcp251x_spi_trans

mcp251x_write_bits

mcp251x_spi_trans

mcp251x_read_reg

mcp251x_spi_trans

mcp251x_read_reg

mcp251x_spi_trans

mcp251x_read_reg

mcp251x_spi_trans
mcp251x spi0.0: CNF: 0x03 0xf5 0x01

mcp251x_write_reg

mcp251x_spi_trans

mcp251x_write_reg

mcp251x_spi_trans

mcp251x_write_reg

mcp251x_spi_trans

mcp251x_write_reg

mcp251x_spi_trans

mcp251x_read_reg

mcp251x_spi_trans


# ./cansend can0 111#1122334455667788

mcp251x_hw_tx

mcp251x_hw_tx_frame

mcp251x_spi_trans

mcp251x_write_reg

mcp251x_spi_trans

mcp251x_read_reg

mcp251x_spi_trans

mcp251x_write_bits

mcp251x_spi_trans

mcp251x_read_reg

mcp251x_spi_trans

mcp251x_write_reg

mcp251x_spi_trans
can state bus off
can_bus_off
mcp251x spi0.0: bus-off

mcp251x_write_reg

mcp251x_spi_trans

现在的问题 板子上面的can没有连接其他can设备,是否需要两块板子来测试?从debug看,数据没有发出去,是否是can没有检测到其他节点情况下,发不出去?

hongjiujing 发表于 2011-11-3 17:08:53

可以了.
用socketcan接口,很好用.

收发器电源没有打开.

tcc89xxevb 发表于 2011-11-4 13:12:32

CAN数据是需要回应用的,如果没有回应在CAN控制器上状态是显示没有发送成功

hynwind 发表于 2011-11-5 17:31:11

哦，可以参考一下飞凌的CAN模块

hongjiujing 发表于 2011-11-7 14:56:08

飞凌的can 代码,搞的很乱, can driver也有bug.

yyccaa 发表于 2011-11-7 17:58:57

像6410这种一般用于HMI设备的芯片，我觉得还是别直接搞CAN网络，做CAN的应用层协议效果可能更差，不如单独用个单片机处理CAN协议，开个内存范围，让6410用集成的外设（比如UART）访问会更简单。
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