TI中文支持网AT24C08 的A0、A1、A2、WP引脚接GND
#define EEPROM_SLAVE_ADDR (0xA0 >> 1) （p0 p1=00 ：默认访问第一块）
void Init_I2c(void)
{
GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0; // Enable pull-up for GPIO32 (SDAA)
GpioCtrlRegs.GPBPUD.bit.GPIO33 = 0; // Enable pull-up for GPIO33 (SCLA)
GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3; // Asynch input GPIO32 (SDAA)
GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3; // Asynch input GPIO33 (SCLA)
GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1; // Configure GPIO32 for SDAA operation
GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1; // Configure GPIO33 for SCLA operation
// Initialize I2C
I2caRegs.I2CMDR.all = 0;//I2C reset
I2caRegs.I2CPSC.all = 5; // Prescaler – need 7-12 Mhz on module clk 60Mhz/(5+1)=10mhz 系统时钟60M，使用内部时钟1
//400khz=clk 10mhz/((clkL+5)+(clkH+5))
// I2caRegs.I2CCLKL = 10; // NOTE: must be non zero
// I2caRegs.I2CCLKH = 5; // NOTE: must be non zero
//clk=100khz
I2caRegs.I2CCLKL = 50; // NOTE: must be non zero
I2caRegs.I2CCLKH = 40; // NOTE: must be non zero
// I2caRegs.I2CIER.all = 0x24; // Enable SCD & ARDY __interrupts
I2caRegs.I2CIER.all = 0x00; // no __interrupts
I2caRegs.I2CMDR.bit.IRS = 1;//I2C enable 是不是时钟使能后 SCL线上就能测试到时钟波形了，还是发送启动信号后才能测试到？
I2caRegs.I2CMDR.bit.FREE = 1;//interrupt 不影响接收发送
I2caRegs.I2CFFTX.all = 0x6040; // Enable FIFO mode and TXFIFO
I2caRegs.I2CFFRX.all = 0x2044; // Enable RXFIFO, clear RXFFINT,
/*
* 1、I2CSAR 在初始化时没必要配置，用到那个从设置，就设置这个值，写入的地址等于实际的地址左移一位的值，目的是把读写位去掉
* 2、I2C模块的操作采用FIFO查询的方式进行
*/
}
curr_Msg.MsgStatus = I2C_MSGSTAT_SEND_WITHSTOP;
curr_Msg.SlaveAddress = EEPROM_SLAVE_ADDR;
// curr_Msg.MemoryHighAddr = paramData[1];
curr_Msg.MemoryLowAddr = paramData[2];
curr_Msg.NumOfBytes =1;
curr_Msg.MsgBuffer[0] = paramData[4];
I2CA_WriteData(&curr_Msg);//调用任意地址写函数
Uint16 I2CA_WriteData( struct I2CMSG* msg)
{
Uint16 i;
// Wait until the STP bit is cleared from any previous master communication.
// Clearing of this bit by the module is delayed until after the SCD bit is
// set. If this bit is not checked prior to initiating a new message, the
// I2C could get confused.
if (I2caRegs.I2CMDR.bit.STP == 1)
{
return I2C_STP_NOT_READY_ERROR;
}
// Setup slave address
I2caRegs.I2CSAR = msg->SlaveAddress;
// Check if bus busy
if (I2caRegs.I2CSTR.bit.BB == 1)
{
return I2C_BUS_BUSY_ERROR;
}
// Setup number of bytes to send
// MsgBuffer + Address
I2caRegs.I2CCNT = msg->NumOfBytes+1;
// I2caRegs.I2CDXR = msg->MemoryHighAddr;
// Setup data to send
I2caRegs.I2CDXR = msg->MemoryLowAddr;
for (i=0; i<msg->NumOfBytes; i++)
{
I2caRegs.I2CDXR = *(msg->MsgBuffer+i);
}
I2caRegs.I2CFFTX.bit.TXFFINTCLR =1;
/*
* 清楚标志位，一定要写完数据在清楚，不然清楚不了，因为IL的值设置的为0
*/
// Send start as master transmitter
I2caRegs.I2CMDR.all = 0x6E20;// 这里执行后，SDL和SDA 两根线上无波出来，一直都是高电平
// I2caRegs.I2CMDR.bit.MST =1;
// I2caRegs.I2CMDR.bit.TRX=1;
// I2caRegs.I2CMDR.bit.STT =1;
// I2caRegs.I2CMDR.bit.STP =1;
/* bit15:NACKMOD=0 receive 时才有用，发送模式无用
* bit14：FREE=1： 在调试模式下，模块不受断点影响，可以正常工作
* bit13：STT =1 ：在主模式下，产生一个起始信号
*
* bit11：STP =1 ：内部计数器减为0时，产生一个stop信号
* bit10：MST =1 :模块工作在主模式
* bit9 ：TRX =1 ：transmitter mode
* bit8 ：XA =0 ：7bit address mode
*
* bit7: RM =0 ： NonRepeat mode
* bit6： DLB = 0 ：Digital loopback mode is diaable
* bit5： IRS = 1； The I2C module is enabled
* bit4： STN = 0： The I2C module is not in the START byte mode
*
* bit3： FDF = 0： Free data format mode is disable ，地址位是7位或10位
* bit2~0： BC = 0；8 bit per data Byte
*
*/
while(I2caRegs.I2CFFTX.bit.TXFFST !=0){}//等待数据发送完成 程序死在这里，也就是说TXFFST的位等于写入的数据个数，这里为2.这个程序是在377XD
//系列上调试过的没有什么问题，只是更改了一个EEPROM内部写入的地址，望指点
if(I2caRegs.I2CSTR.bit.SCD == 1)
I2caRegs.I2CSTR.bit.SCD = 1;
/*
* SCD=1 清楚SCD 和NACK位
*/
return I2C_SUCCESS;
}
user4329368：// 回环测试 startI2caRegs.I2CMDR.bit.MST=1;I2caRegs.I2CMDR.bit.TRX=1;I2caRegs.I2CMDR.bit.DLB =1;while(!(I2caRegs.I2CSTR.bit.XRDY ==1));I2caRegs.I2CDXR = 0xaa;I2caRegs.I2CMDR.bit.STT =1;data = I2caRegs.I2CDRR;while(!(I2caRegs.I2CSTR.bit.XRDY ==1));I2caRegs.I2CDXR = 0x55;data = I2caRegs.I2CDRR;I2caRegs.I2CMDR.bit.STP =1;//end
验证了一下回环的功能，也是OK的 I2CDRR 中的数据等于I2cDXR 中的数据。
