|
将两片LM3S8962用I2C总线相连，一台为主机，另一台为从机，将从机的地址设置为0xA2，主机和地址0xA2的从机通信完全正常。主机使用I2C广播呼叫地址和从机通信，从机无法产生中断。也就是说，LM3S8962的I2C不能使用广播地址。太郁闷了。<br /><br />看看NXP的LPC2200控制器的I2C（参见其英文数据表P159)：<br />I2C Slave Address register (I2ADR - 0xE001 C00C)<br />These registers are readable and writable, and is only used when an I2C interface is set to<br />slave mode. In master mode, this register has no effect. The LSB of I2ADR is the general<br />call bit. When this bit is set, the general call address (0x00) is recognized.<br /><br />Bit Symbol Description Reset value<br />0 GC General Call enable bit. 0<br />7:1 Address The I2C device address for slave mode. 0x00<br /><br />LPC2200控制器的I2C在从机模式下就可以既接收从机地址，也可以接收广播地址。<br />看来选芯片还是要选择大厂家的主流芯片，Luminary这方面还是做的不够好 |
|
楼主
