who can help me about I2C

For the IP core ,you could download the NIOS2 linux1.3 , then set up the nios2linux 1.3 and you could see the IP core in SOPC builder!

List is my soyurce code for test IIC , help me!

I2C_prescale=ALT_CPU_FREQ/(5*100000)-1;//ALT_CPU_FREQ is in "system.h"

IOWR(I2C_BASE,I2C_PRERlo,I2C_prescale);

IOWR(I2C_BASE,I2C_PRERhi,I2C_prescale>>8); // high 8 bits

PRERhi=IORD(I2C_BASE,I2C_PRERhi);//read again

printf(" again PRERhi=%d\n",PRERhi);

PRERlo=IORD(I2C_BASE,I2C_PRERlo);

printf("again PRERlo=%d\n",PRERlo);

//enable I2C

CTR=IORD(I2C_BASE,I2C_CTR);

printf("CTR=%2x\n",CTR);

IOWR(I2C_BASE,I2C_CTR,0x80);

CTR=IORD(I2C_BASE,I2C_CTR);

printf("CTR=%2x\n",CTR);

for(j=1;j<=8;j++)

{

printf("IIC test=%2x\n",j);

//slect device

CSR=IORD(I2C_BASE,I2C_CSR);

printf("1 CSR=%2x\n",CSR);

IOWR(I2C_BASE,I2C_DATA,E2PROM_ADDR); //ob1010000 0 ,prepare the data first

IOWR(I2C_BASE,I2C_CSR,0x91); //STA,WR,IACK ,start transferring

//select memory

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02)

printf("2 busy CSR=%2x\n",CSR) ; //tip=1 :when transferring data

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x80)

printf("3 no ack CSR=%2x\n",CSR) ; //rxack=0: Acknowledge received

IOWR(I2C_BASE,I2C_DATA,eeprom_a+j);

IOWR(I2C_BASE,I2C_CSR,0x11); //WR,IACK

CSR=IORD(I2C_BASE,I2C_CSR);

printf("4 CSR=%2x\n",CSR);

//write data and terminate

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02)

printf("5 busy CSR=%2x\n",CSR) ; //tip=1

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x80)

printf("6 no ack CSR=%2x\n",CSR) ; //rxack=0

//j=1;

IOWR(I2C_BASE,I2C_DATA,eeprom_d+j);

IOWR(I2C_BASE,I2C_CSR,0x51); //STO,WR,IACK

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02) //tip=1

printf("7 busy CSR=%2x\n",CSR);

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x80) //rxack=0

printf("8 no ack CSR=%2x\n",CSR);

i = 0;

while (i<200000)

i++;

i = 0;

while (i<200000)

i++;

CSR=IORD(I2C_BASE,I2C_CSR);

printf("9 CSR=%2x\n",CSR);

///////////////////////////////////////////////////////////////

//read back

/////////////////////////////////////

//slect device COMMAND 1

IOWR(I2C_BASE,I2C_DATA,E2PROM_ADDR);

IOWR(I2C_BASE,I2C_CSR,0x91); //STA,WR,IACK

//select memory

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02); //tip=1

printf("10 CSR=%2x\n",CSR); //rxack=0

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x80); //rxack=0

IOWR(I2C_BASE,I2C_DATA,eeprom_a+j-1);

IOWR(I2C_BASE,I2C_CSR,0x11); //WR,IACK

//select device and READ COMMAND 2

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02); //tip=1

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x80); //rxack=0

IOWR(I2C_BASE,I2C_DATA,E2PROM_ADDR+1); //device address and READ

IOWR(I2C_BASE,I2C_CSR,0x91); //re-STA,WR,IACK

//read data and terminate

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02) //tip=1

{

printf(" test1 CSR=%2x\n",CSR);

}

CSR=IORD(I2C_BASE,I2C_CSR);

printf(" test2 CSR=%2x\n",CSR);

IOWR(I2C_BASE,I2C_CSR,0x21); //RD,ACK,IACK (0b0010 0001)

while (i<50000)

i++;

Readdata_I2C_B=0x00;

Readdata_I2C_B=IORD(I2C_BASE,I2C_DATA);

printf(" Readdata_I2C_B=%2x\n",Readdata_I2C_B); //rxack=0

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02); //tip=1

{

printf(" test3 CSR=%2x\n",CSR); //rxack=0

}

//2005,07,20 shield

//while((CSR=IORD(I2C_BASE,I2C_CSR))&0x80); //rxack=0 maybe not need the lopp

//2005,07,20

IOWR(I2C_BASE,I2C_CSR,0x69); //STO,RD,NACK,IACK (0b01101001)

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02); //tip=1

// while((CSR=(I2C_BASE,I2C_CSR))&0x80)

printf(" 11 CSR=%2x\n",CSR); //rxack=0

Readdata_I2C=0x00;

Readdata_I2C=IORD(I2C_BASE,I2C_DATA);

if(Readdata_I2C==(eeprom_d+j))

printf("write data= %2x Readdata_I2C=%2x\n OK\n!",eeprom_d+j,Readdata_I2C);

else

printf("write data= %2x Readdata_I2C=%2x\n ERROR!\n",eeprom_d+j,Readdata_I2C);

i = 0;

while (i<200000)

i++;

i = 0;

while (i<200000)

i++;

} // Have been tested OK !

// continuous read 8 bytes data by "sequential read " command

printf(" IIC continously read test\n"); //rxack=0

//slect device COMMAND 1

IOWR(I2C_BASE,I2C_DATA,E2PROM_ADDR);

IOWR(I2C_BASE,I2C_CSR,0x91); //STA,WR,IACK

//select memory

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02); //tip=1

printf("c1 CSR=%2x\n",CSR); //rxack=0

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x80); //rxack=0

IOWR(I2C_BASE,I2C_DATA,eeprom_a); // from first address

IOWR(I2C_BASE,I2C_CSR,0x11); //WR,IACK

//select device and READ COMMAND 2

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02); //tip=1

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x80); //rxack=0

IOWR(I2C_BASE,I2C_DATA,E2PROM_ADDR+1); //device address and READ

IOWR(I2C_BASE,I2C_CSR,0x91); //re-STA,WR,IACK

//read data and terminate

// prepare to get date

// need judge ACK

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02); //tip=1

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x80); //rxack=0

for(j=1;j<=6;j++) // when I change the loop number, the last byte is always right

{

CSR=IORD(I2C_BASE,I2C_CSR);

printf(" C2 CSR=%2x\n",CSR);

while(((CSR=IORD(I2C_BASE,I2C_CSR))&0x02)== 0x20) //tip=1

{

printf(" C3 CSR=%2x\n",CSR);

}

CSR=IORD(I2C_BASE,I2C_CSR);

printf(" C4 CSR=%2x\n",CSR);

IOWR(I2C_BASE,I2C_CSR,0x21); //ACK,IACK (0b0010 0001)

Readdata_I2C_B=0x00;

Readdata_I2C_B=IORD(I2C_BASE,I2C_DATA);

printf(" data= %2x Readdata_I2C_B=%2x\n OK!",j,Readdata_I2C_B);

} // read 6 bytes ,all is error

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02) //tip=1

{

printf(" C5 CSR=%2x\n",CSR); //rxack=0

}

IOWR(I2C_BASE,I2C_CSR,0x69); // STO,RD,NACK,IACK (0b01101001)

while((CSR=IORD(I2C_BASE,I2C_CSR))&0x02); //tip=1

printf(" C6 CSR=%2x\n",CSR); //rxack=0

Readdata_I2C=0x00;

Readdata_I2C=IORD(I2C_BASE,I2C_DATA); // the last byte is OK!

printf("data = 8 Readdata_I2C=%2x\n OK!",Readdata_I2C);