opencoreI2C for cyclone3

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;

}

}