opencoreI2C for cyclone3

[Altera_Forum]

Hi I am implementing opencoreI2C, can some one double check my code. I am new to opencoreso I am having problems in figuring out scl and sda. 

 Here is my code # include <stdio.h># include "alt_types.h"# include "opencores_i2c_regs.h"# include "opencores_i2c.h"   int main() { /* IOWR_OPENCORES_I2C_CTR(0x0, 0xA); /* turn off the core*/  //IORD_OPENCORES_I2C_CTR(0x0); /* turn off the core*/ /*  printf("IORD: %x",IORD_OPENCORES_I2C_CTR(0x0));    return 0; } */# define I2C_BASE 0x0# define clk ALT_CPU_FREQ# define speed 100000        //I2C_init(alt_u32 base, alt_u32 clk, alt_u32 speed);  // ++++++++++++++++++++++++ initialize ++++++++++++++++++++++++++++++++++++    //IOWR_OPENCORES_I2C_CTR(I2C_BASE,0); // turn off the core  //int i = 100;  //while (i!=0){  //printf("CTR %x at base %x \n",IORD_OPENCORES_I2C_CTR(I2C_BASE),I2C_BASE);  //--i;  //}# define I2C_DEBUG //int I2C_init(alt_u32 base,alt_u32 clk, alt_u32 speed) //int I2C_start(alt_u32 base, alt_u32 add, alt_u32 write); //alt_u32 I2C_read(alt_u32 base); //int I2C_write(alt_u32 base, alt_u8 data); //int I2C_stop(alt_u32 base);   /* these functions are polled only. */ /* all functions wait until the I2C is done before exiting */     /**************************************************************** int I2C_init  This function inititlizes the prescalor for the scl  and then enables the core. This must be run before  any other i2c code is executed inputs  base = the base address of the component  clk = freuqency of the clock driving this component ( in Hz)  speed = SCL speed ie 100K, 400K ... (in Hz) 15-OCT-07 initial release *****************************************************************/        IOWR_OPENCORES_I2C_CR(I2C_BASE, OPENCORES_I2C_CR_IACK_MSK); // clearn any pening IRQ  IOWR_OPENCORES_I2C_PRERLO(I2C_BASE,0x31); // load low presacle bit  IOWR_OPENCORES_I2C_PRERHI(I2C_BASE,0x00); // load upper prescale bit    IOWR_OPENCORES_I2C_CTR(I2C_BASE,0x80); // turn on the core  printf("CTR %x \n",IORD_OPENCORES_I2C_CTR(I2C_BASE));    //++++++++++++++++++++++++ send slave address and verify ++++++++++++++++++    IOWR_OPENCORES_I2C_TXR (I2C_BASE, 0x3A);  IOWR_OPENCORES_I2C_CR(I2C_BASE, 0x90);        while( IORD_OPENCORES_I2C_SR(I2C_BASE) & OPENCORES_I2C_SR_TIP_MSK)      {printf( "TIP 1\n");  //while(( IORD_OPENCORES_I2C_SR(I2C_BASE) & 0x02) == 0x02)  //{printf( "TIP 1 & SR = %x \n",IORD_OPENCORES_I2C_SR(I2C_BASE));}    printf( "SR = %x \n",IORD_OPENCORES_I2C_SR(I2C_BASE));    while((IORD_OPENCORES_I2C_SR(I2C_BASE) & 0x80) == 0x80)  {printf("NO ACK 1\n");  IOWR_OPENCORES_I2C_TXR (I2C_BASE, 0x3A);  IOWR_OPENCORES_I2C_CR(I2C_BASE, 0x80);  while(( IORD_OPENCORES_I2C_SR(I2C_BASE) & 0x02) == 0x02)  printf( "TIP 1 & SR = %x \n",IORD_OPENCORES_I2C_SR(I2C_BASE));      printf("hi");    //else //++++++++++++++ send slave register address to be read from ++++++++++  printf("ACK 1\n");  printf( "SR = %x \n",IORD_OPENCORES_I2C_SR(I2C_BASE));  IOWR_OPENCORES_I2C_TXR(I2C_BASE, 0x00);    IOWR_OPENCORES_I2C_CR(I2C_BASE, 0x90);    while( (IORD_OPENCORES_I2C_SR(I2C_BASE) & 0x02) == 0x02 )  {printf( "TIP 2 \n");}    if((IORD_OPENCORES_I2C_SR(I2C_BASE) & 0x80) == 0x80)  printf("\t NO ACK 2\n");  else{  IOWR_OPENCORES_I2C_TXR(I2C_BASE, 0x3B);    IOWR_OPENCORES_I2C_CR(I2C_BASE, 0x90);    {printf( "TIP 3 \n");}    if((IORD_OPENCORES_I2C_SR(I2C_BASE) & 0x80) == 0x80)  printf("\t NO ACK 3\n");  else{  alt_u32 x = IORD_OPENCORES_I2C_RXR(I2C_BASE);  printf("Received Byte %x \n",x);  IOWR_OPENCORES_I2C_CR(I2C_BASE, 0x08);  IOWR_OPENCORES_I2C_CR(I2C_BASE, 0x08);  IOWR_OPENCORES_I2C_CTR(I2C_BASE,0x00);  }  }      }  return 0; }   }