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标题: 关于库函数里面的I2C函数。 [打印本页]

作者: reporter 时间: 2013-9-26 10:26 标题: 关于库函数里面的I2C函数。

void _IIC_write(I2C_Handle hI2C,
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Uint8 devAddress,
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Uint32&nbsp;&nbsp;subAddress,
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Uint8 data
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;)
{&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;
&nbsp; &nbsp; I2C_Config prevI2CCfg;
&nbsp; &nbsp;
&nbsp; &nbsp; /* Wait until bus is free */
&nbsp; &nbsp; while (I2C_bb(hI2C));
&nbsp; &nbsp;
&nbsp; &nbsp; /* Save old settings */
&nbsp; &nbsp; I2C_getConfig(hI2C, &amp;prevI2CCfg);
&nbsp; &nbsp;
&nbsp; &nbsp; /* Restore settings for AIC23 */
&nbsp; &nbsp; SEEDDM642IIC_Configt.i2csar = devAddress;
&nbsp; &nbsp; I2C_config(hI2C, &amp;SEEDDM642IIC_Configt);

&nbsp; &nbsp; /* Submit the MSB for transmit */
&nbsp; &nbsp; I2C_RSETH(hI2C, I2CDXR, (subAddress) &amp; 0xff);
&nbsp; &nbsp;
&nbsp; &nbsp; /* Generate start condition, starts transmission */
&nbsp; &nbsp; I2C_start(hI2C);
&nbsp; &nbsp;
&nbsp; &nbsp; /* Wait until MSB transmit is done */
&nbsp; &nbsp; while(!I2C_xrdy(hI2C));

&nbsp; &nbsp; /* Submit the LSB for transmit */
&nbsp; &nbsp; I2C_RSETH(hI2C, I2CDXR,data);&nbsp; &nbsp;
//&nbsp; &nbsp;EVMDM642_waitusec(350);
&nbsp; &nbsp;
&nbsp; &nbsp; /* Generate stop condition */
&nbsp; &nbsp; I2C_sendStop(hI2C);&nbsp;&nbsp;

&nbsp; &nbsp; /* Wait until bus is free */
&nbsp; &nbsp; while (I2C_bb(hI2C));
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;
&nbsp; &nbsp; EVMDM642_waitusec(350);

&nbsp; &nbsp; /* Reconfigure I2C with old settings */
&nbsp; &nbsp; I2C_config(hI2C, &amp;prevI2CCfg);&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;
}
=========================================================
首先void _IIC_write(I2C_Handle hI2C,
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Uint8 devAddress,
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Uint32&nbsp;&nbsp;subAddress,
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Uint8 data
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;)
这4个参数分别代表什么意思呢？
其次能详细讲解下每一行代码都表示什么意思吗？这个是库函数里面的I2C程序，我查了书和网上的资料都没有关于它的讲解。新手没什么分，只能在此谢过大神了！

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