电子技术论坛_中国专业的电子工程师学习交流社区-中电网技术论坛

标题: 28027的I2C模块 [打印本页]

作者: reporter 时间: 2013-10-31 10:11 标题: 28027的I2C模块

手册中未给出配置使用步骤，例程中有I2C和EEPROM的通信，在历程中看到发数据是这样的过程

Uint16 I2CA_WriteData(struct I2CMSG *msg)
{
&nbsp; &nbsp;Uint16 i;

&nbsp; &nbsp;// Wait until the STP bit is cleared from any previous master communication.
&nbsp; &nbsp;// Clearing of this bit by the module is delayed until after the SCD bit is
&nbsp; &nbsp;// set. If this bit is not checked prior to initiating a new message, the
&nbsp; &nbsp;// I2C could get confused.
&nbsp; &nbsp;if (I2caRegs.I2CMDR.bit.STP == 1)
&nbsp; &nbsp;{
&nbsp; &nbsp;&nbsp; &nbsp;return I2C_STP_NOT_READY_ERROR;
&nbsp; &nbsp;}

&nbsp; &nbsp;// Setup slave address
&nbsp; &nbsp;I2caRegs.I2CSAR = msg-&gt;SlaveAddress;

&nbsp; &nbsp;// Check if bus busy
&nbsp; &nbsp;if (I2caRegs.I2CSTR.bit.BB == 1)
&nbsp; &nbsp;{
&nbsp; &nbsp;&nbsp; &nbsp;return I2C_BUS_BUSY_ERROR;
&nbsp; &nbsp;}

&nbsp; &nbsp;// Setup number of bytes to send
&nbsp; &nbsp;// MsgBuffer + Address
&nbsp; &nbsp;I2caRegs.I2CCNT = msg-&gt;NumOfBytes+2;

&nbsp; &nbsp;// Setup data to send
&nbsp; &nbsp;I2caRegs.I2CDXR = msg-&gt;MemoryHighAddr;
&nbsp; &nbsp;I2caRegs.I2CDXR = msg-&gt;MemoryLowAddr;
// for (i=0; i&lt;msg-&gt;NumOfBytes-2; i++)
&nbsp; &nbsp;for (i=0; i&lt;msg-&gt;NumOfBytes; i++)

&nbsp; &nbsp;{
&nbsp; &nbsp;&nbsp; &nbsp;I2caRegs.I2CDXR = *(msg-&gt;MsgBuffer+i);
&nbsp; &nbsp;}

&nbsp; &nbsp;// Send start as master transmitter
&nbsp; &nbsp;I2caRegs.I2CMDR.all = 0x6E20;

&nbsp; &nbsp;return I2C_SUCCESS;
}

欢迎光临电子技术论坛_中国专业的电子工程师学习交流社区-中电网技术论坛 (http://bbs.eccn.com/)