请教大师帮俺看看6747的I2C接口调试

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reporter发表于 2013-9-16 11:03 | 只看该作者

请教大师帮俺看看6747的I2C接口调试

寄存器, 硬件, 示波器, 程序, 接口

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&nbsp; &nbsp;&nbsp;&nbsp;你好。I2C接口调试不通过，想请教一下，是怎么回事，我用示波器测试输出的SCL口，硬件的从地址已经输出来了，但是没有数据输出。程序调用出错，C6747_I2C_write（）返回值正常应该是0，怎么老是返回-1。感觉好像就没有将数据发送出去一样，好像是寄存器配置有问题，但仔细看了遍，也没发现是什么问题呀，请你多多帮忙，谢谢！
Int16 C6747_I2C_write( Uint16 i2c_addr, Uint8* data, Uint16 len )
{
&nbsp;&nbsp;
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;C6747_wait( 10 );&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;// Short delay

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;for ( i = 0 ; i &lt; len ; i++ )
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;{
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;I2C_ICDXR = data;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;// Write

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;timeout = i2c_timeout;
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;do
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;{
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; if ( timeout-- &lt; 0&nbsp;&nbsp;)
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; {
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;C6747_I2C_reset( );
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;return -1;
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; }
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;} while ( ( I2C_ICSTR &amp; ICSTR_ICXRDY ) == 0 );// Wait for Tx Ready
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;}

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;I2C_ICMDR |= ICMDR_STP;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; // Generate STOP

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;return 0;

}

俺又仔细看了一遍，在while ( ( I2C_ICSTR &amp; ICSTR_ICXRDY ) == 0 );// Wait for Tx Ready
查看寄存值为I2C_ICSTR =0X1406.IRS位在寄存器ICMDR中已经置位了，根据提示

应该是The I2C has received or transmitted a START bit on the bus.可是需要怎么设置呢，我搞了两天了也没搞出来。

真的是无语了。。。。。。。寄存器设置如下：
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;I2C_ICMDR&nbsp;&nbsp;= 0;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;// Reset I2C
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;I2C_ICMDR&nbsp;&nbsp;= ICMDR_TRX&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;// set for Transmitter mode
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; | ICMDR_MST;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;// Set for Master Write

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;I2C_ICSAR&nbsp;&nbsp;= i2c_addr;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;// Set I2C slave address
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;I2C_ICPSC&nbsp;&nbsp;= 9;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;// Prescale to get 7.5MHz I2C internal
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;I2C_ICCLKL = 15;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;// Config clk LOW for 100kHz
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;I2C_ICCLKH = 40;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;// Config clk HIGH for 100kHz&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;
&nbsp; &nbsp;&nbsp; &nbsp;I2C_ICSTR&nbsp;&nbsp;= I2C_ICSTR;
&nbsp;&nbsp;while (!(I2C_ICIVR == 0));
&nbsp;&nbsp;
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;I2C_ICMDR |= ICMDR_IRS;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; // Release I2C from reset

&nbsp;&nbsp;while (!(( I2C_ICSTR &amp; ICSTR_BB ) == 0 ));
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;I2C_ICMDR |= ICMDR_STT;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;
&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;//以上都是按TI手册中Configuring the I2C 步骤来的，已经核对了，没有发现问题&nbsp;&nbsp;

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