TMS320F28035: 求一个把此芯片作为I2C从机的参考程序

在这颗芯片的例程中，没有看到作为I2C从机的程序，我想要一个参考程序，满足以下要求：

1. 从机，8位数据。

2. 能中断响应I2C。

3. 对主机而言，这颗芯片在收到地址后能进入中断，在接收和发送一个数据后，也能进入中断。

麻烦提供一个参考程序，谢谢！

Green Deng：

你好，非常抱歉，目前官方还没有I2C作为从机的程序，包括其他芯片也没有提供类似要求的例程。

你可以找一下第三方网页上是否有相关例程

,

zhuo chong：

谢谢Green的回复！

如果没有参考例程，可否帮忙看看以下程序哪里有问题？谢谢！

初始化代码：

{// Initialize I2C-A:EALLOW;SysCtrlRegs.PCLKCR0.bit.I2CAENCLK = 1;// I2CGpioCtrlRegs.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 operationGpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1;// Configure GPIO33 for SCLA operationEDIS;I2caRegs.I2CMDR.bit.IRS = 0;//I2C Reset bit.I2caRegs.I2CMDR.bit.MST = 0;//@NOTE: 0=slave mode; 1=master mode.I2caRegs.I2CMDR.bit.XA= 0;//@NOTE: 0=7bit address; 1=10bit address.I2caRegs.I2CMDR.bit.BC= 0x00;//@NOTE: 0=8 bits per data byteI2caRegs.I2CMDR.bit.NACKMOD = 0;//I2C Reset bit.I2caRegs.I2CEMDR.bit.BCM= 0x00;I2C_SetPMbusAddress(SLAVE_ADDRESS_INIT);I2caRegs.I2CIER.bit.AAS = 1;//Addressed as slave interrupt enable 1h (R/W) = Interrupt request enabledI2caRegs.I2CIER.bit.SCD = 1;//Stop condition detected interrupt enable 1h (R/W) = Interrupt request enabled//this for non-PEC checkI2caRegs.I2CIER.bit.RRDY = 1;//receive readyI2caRegs.I2CIER.bit.XRDY = 1;//transmit readyI2caRegs.I2CSAR = 0x0000;// The next address.I2caRegs.I2CPSC.bit.IPSC = 5;// Prescaler - need 7-12 Mhz on module clk (60/6 = 10MHz)// module clock frequency = I2C input clock frequency/(IPSC + 1)// 10MHz/(45+5 + 45 +5) = 100KI2caRegs.I2CCLKL = 45;// NOTE: must be non zeroI2caRegs.I2CCLKH = 45;// NOTE: must be non zeroI2caRegs.I2CMDR.bit.IRS = 1;//I2C Reset bit.Take I2C out of resetI2caRegs.I2CFFTX.all = 0x0000;// Enable FIFO mode and TXFIFOI2caRegs.I2CFFRX.all = 0x0000;// Enable RXFIFO, clear RXFFINT,
}

中断处理代码：

{Uint16 u16IntSrcReg;
//static Uint16 i = 0;
//static Uint16 j = 0;u16IntSrcReg = (Uint16)I2caRegs.I2CISRC.bit.INTCODE;switch(u16IntSrcReg){case 0x01://Arbitration lostbreak;case 0x02://No-acknowledgment condition detectedbreak;case 0x03://Registers ready to be accessedbreak;case 0x04://while(I2caRegs.I2CFFRX.bit.RXFFST < 4){};j= 0;if(I2caRegs.I2CSTR.bit.SDIR == 1){//}else//slave read data{RxData[i] = I2caRegs.I2CDRR;command = RxData[0];if(i>=6){i=0;}else{i++;if((command_type == 1)&&(command == 0x99))//command length =1{i=0;}}}break;case 0x05://Transmit data readyif(command == 0x99){//while(!I2C_xrdy());//while(I2caRegs.I2CSTR.bit.XRDY != 1) {};// 1 = Data transferred tp the core TX register after shifting dataif(j>=7){I2caRegs.I2CDXR = 0xFF;}else{I2caRegs.I2CDXR = Array[j];}j++;}else{I2caRegs.I2CDXR = 0xFF;}break;case 0x06://Stop condition detectedbreak;case 0x07://Addressed as slaveif(I2caRegs.I2CSTR.bit.SDIR == 1)//means address read{//address readI2C_bIsSlaveAddressRead();}else{//I2caRegs.I2CIER.bit.XRDY = 0;//address write//I2caRegs.I2CMDR.bit.TRX = 0;I2C_bIsSlaveAddressWrite();//i=0;}break;default://error happenbreak;}PieCtrlRegs.PIEACK.all = PIEACK_GROUP8;//release other interrupt
}

问题：怎样设定，可以让地址中断先发生，而数据发送中断后发生？谢谢！

,

Green Deng：

这个很抱歉，我对I2C模块也不太熟悉。建议你将问题直接发布到英文E2E论坛，英文论坛应该会有对I2C比较熟悉的工程师帮你解决问题：

e2e.ti.com/…/c2000-microcontrollers-forum