Help me to config ADV7181B with I2C core on DE2 kit

[Altera_Forum]

Hi all, 

I try using SOPC with Nios II and Microtronix I2C core to configure ADV7181B (video convert IC on DE2 kit) , but it not work.  Could anyone help me to fix this problem. Thanks for reading!  This `s my C code:  # define I2C_BASE 0x00000020# define OUT_LED (unsigned char *) 0x01003000 int i2c_write_adv(unsigned char slave_addr); void write_byte (unsigned char reg_addr, unsigned char data);  int main() {  i2c_write_adv(0x20);    return 1; } int i2c_write_adv(unsigned char slave_addr) {  int i;  // ADV Address  IOWR_MTX_AVALON_I2C_ADDR(I2C_BASE, slave_addr);    // Start Condition   IOWR_MTX_AVALON_I2C_CONTROL(I2C_BASE,MTX_AVALON_I2C_ENABLE | MTX_AVALON_I2C_MASTER_STANDARD | MTX_AVALON_I2C_START );    // Wait for event    while( !(IORD_MTX_AVALON_I2C_STATUS(I2C_BASE) & MTX_AVALON_I2C_IRQ) );    // Clear interrupt  IOWR_MTX_AVALON_I2C_STATUS(I2C_BASE, 0);  // Check if ADV responded  if (IORD_MTX_AVALON_I2C_STATUS(I2C_BASE) & MTX_AVALON_I2C_NACK)  {  printf("ADV not found.\n");  return 0;  }    write_byte (0x15,0x10);    // Stop Condition  IOWR_MTX_AVALON_I2C_CONTROL(I2C_BASE,IORD_MTX_AVALON_I2C_CONTROL(I2C_BASE) | MTX_AVALON_I2C_STOP);   // Wait for event  while( !(IORD_MTX_AVALON_I2C_STATUS(I2C_BASE) & MTX_AVALON_I2C_IRQ) );  // Clear interrupt  IOWR_MTX_AVALON_I2C_STATUS(I2C_BASE, 0);  // Disable  IOWR_MTX_AVALON_I2C_CONTROL(I2C_BASE, 0);  return 1; } void write_byte (unsigned char reg_addr, unsigned char data) {  // write address  IOWR_MTX_AVALON_I2C_DATA(I2C_BASE, reg_addr);  // Wait for event  while( !(IORD_MTX_AVALON_I2C_STATUS(I2C_BASE) & MTX_AVALON_I2C_IRQ) ) ;    // write a byte(fill transmit buffer)  IOWR_MTX_AVALON_I2C_DATA(I2C_BASE, data);    // Wait for transmit buffer empty  while( !(IORD_MTX_AVALON_I2C_STATUS(I2C_BASE) & MTX_AVALON_I2C_IRQ) ) ;   }  my project is attach