请教一个MCP2515滤波的问题

-19 · 2012-3-27 14:15

一个项目都快做完了，才发现其中隐含了一个致命的问题......
CAN总线上有若干个节点，其中一个是主机，其他为从机。主机依次向从机发出指令，每个从机都有自己唯一的地址。通信间采用标准帧，D10-D3作为地址码。于是问题来了。为了实现主机通信时只有对应的从机有相应，设置寄存器如下：
mcp2515_write_register(0x60, 0x20);
mcp2515_write_register(0x70, 0x22);
mcp2515_write_register(0X20, 0XFF);
mcp2515_write_register(0X24, 0XFF);

mcp2515_write_register(0X00, DevID);
mcp2515_write_register(0X08, DevID);
这段程序实现了这一功能，但通信间有一种特殊情况，主机广播指令。此时从机收到指令后不做回复。主机发出的地址码为00H。小弟不会设置了... 帮忙啊！

-19 · 2012-3-27 14:16

KAO 点了两下就出来两个一模一样的贴......

1万 · 2012-3-28 08:45

好久没用2515了，之前的使用设置如下：
对每一个filter单独配置
/* filterBuf for Buffer 0 */
filterBuf[0] = P_10ms_SIDH;
filterBuf[1] = P_10ms_SIDL;
filterBuf[2] = P_10ms_EID8;
filterBuf[3] = P_10ms_EID0;
mcp2515_write_register_p( RXF0SIDH, filterBuf, 4 );
mcp2515_write_register_p( RXF1SIDH, filterBuf, 4 );

/* filterBuf for Buffer 1 */
filterBuf[0] = P_XX_SIDH;
filterBuf[1] = P_XX_SIDL;
filterBuf[2] = P_XX_EID8;
filterBuf[3] = 0xF3;//P_XX_EID0;
mcp2515_write_register_p( RXF2SIDH, filterBuf, 4 );
filterBuf[3] = 0xF4;//P_XX_EID0;
mcp2515_write_register_p( RXF3SIDH, filterBuf, 4 );
filterBuf[3] = 0xD0; //0xF0//P_XX_EID0;
mcp2515_write_register_p( RXF4SIDH, filterBuf, 4 );
filterBuf[3] = 0xEF;//P_XX_EID0;
mcp2515_write_register_p( RXF5SIDH, filterBuf, 4 );

filterBuf[0] = P_MASK10ms_SIDH;
filterBuf[1] = P_MASK10ms_SIDL;
filterBuf[2] = P_MASK10ms_EID8;
filterBuf[3] = P_MASK10ms_EID0;
/* Maske for Buffer 0 */
mcp2515_write_register_p( RXM0SIDH, filterBuf, 4 );
/* Maske for Buffer 1 */
filterBuf[0] = P_MASK_SIDH;
filterBuf[1] = P_MASK_SIDL;
filterBuf[2] = P_MASK_EID8;
filterBuf[3] = 0xDF;//P_MASK_EID0;
mcp2515_write_register_p( RXM1SIDH, filterBuf, 4 );