[讨论] 求助，，，大家帮我看看我的28027 i2c模块程序哪里出错了

jetlin1992 2014-7-8 15:17 楼主

程序的功能是给24c02 第0x00个字节写入0x20,然后再读回到变量b中 #include "DSP28x_Project.h" #define I2C_SLAVE_ADDR 0x50 #define I2C_NUMBYTES 15 #define I2C_EEPROM_HIGH_ADDR 0x00 #define I2C_EEPROM_LOW_ADDR 0x00 void I2CA_SendData(void); void I2CA_ReceiveData(void); void main(void) { InitSysCtrl(); InitI2CGpio(); DINT; InitPieCtrl(); IER = 0xffff; IFR = 0x0000; InitPieVectTable(); InitI2C(); I2CA_SendData(); I2CA_ReceiveData(); while(1); } void I2CA_SendData(void) { Uint16 i; I2caRegs.I2CSAR = I2C_SLAVE_ADDR; //Set slave address I2caRegs.I2CCNT = 1 + 1; //Set count to 5 characters plus 2 address bytes I2caRegs.I2CDXR = 0x02;//Send eeprom high address I2caRegs.I2CMDR.bit.TRX = 1; //Set to Transmit mode I2caRegs.I2CMDR.bit.MST = 1; //Set to Master mode I2caRegs.I2CMDR.bit.FREE = 1; //Run in FREE mode I2caRegs.I2CMDR.bit.STP = 1; //Stop when internal counter becomes 0 I2caRegs.I2CMDR.bit.STT = 1; //Send the start bit, transmission will follow while(I2caRegs.I2CSTR.bit.XRDY == 0); //Do nothing till data is shifted out I2caRegs.I2CDXR = 0x20; //Send eeprom low address } void I2CA_ReceiveData(void) { Uint16 i; char b[20]; b[0]=0; I2caRegs.I2CSAR = I2C_SLAVE_ADDR; //Set slave address I2caRegs.I2CCNT = 1; //Set count to 2 address bytes I2caRegs.I2CDXR = 0x00; //Send eeprom high address I2caRegs.I2CMDR.bit.TRX = 1; //Set to Transmit mode I2caRegs.I2CMDR.bit.MST = 1; //Set to Master mode I2caRegs.I2CMDR.bit.FREE = 1; //Run in FREE mode I2caRegs.I2CMDR.bit.STP = 0; //Dont release the bus after Tx I2caRegs.I2CMDR.bit.STT = 1; //Send the start bit, transmission will follow I2caRegs.I2CCNT = 1; //read 5 bytes from eeprom I2caRegs.I2CMDR.bit.TRX = 0; //Set to Recieve mode I2caRegs.I2CMDR.bit.MST = 1; //Set to Master mode I2caRegs.I2CMDR.bit.FREE = 1; //Run in FREE mode I2caRegs.I2CMDR.bit.STP = 1; //Stop when internal counter becomes 0 I2caRegs.I2CMDR.bit.STT = 1; //Repeated start, Reception will follow b[0] = I2caRegs.I2CDRR; while(1); } void InitI2C(void) { // Initialize I2C-A: I2caRegs.I2CSAR = 0x0050; // Slave address - EEPROM control code I2caRegs.I2CPSC.all = 6; // Prescaler - need 7-12 Mhz on module clk I2caRegs.I2CCLKL = 10; // NOTE: must be non zero I2caRegs.I2CCLKH = 5; // NOTE: must be non zero I2caRegs.I2CIER.bit.ARDY = 0; I2caRegs.I2CIER.bit.XRDY = 0; I2caRegs.I2CFFTX.all = 0x0000; // Disable FIFO mode and TXFIFO I2caRegs.I2CFFRX.all = 0x0000; // Disable RXFIFO, clear RXFFINT, I2caRegs.I2CMDR.all = 0x0020; // Take I2C out of reset // Stop I2C when suspended } 本帖最后由 jetlin1992 于 2014-7-8 15:20 编辑