Read/Write EPCS64 flash from Nios II

int Write_flash( alt_flash_fd* fd, float *Ks_para,int test_offset)

{

  int i;

  int ret_code = 0;

  alt_u8 *ptr_ks=(alt_u8*) Ks_para;

  int test_length = sizeof(Ks_para);

  // before writing in a sector, we should erase it before

  ret_code=alt_erase_flash_block(fd, test_offset,regions->block_size);

  if(!ret_code){

    for(i=0;i<test_length;i++){

        printf( "data_written[%d]= 0x%08x\n\r",i,ptr_ks[i]);

    }

    //ret_code = alt_epcq_controller_write_block(fd, test_offset, test_offset,ptr_ks, test_length);

    ret_code=alt_write_flash_block(fd,test_offset,test_offset,ptr_ks,test_length);

  }

  if (ret_code)

  {

      printf( "\nERROR: function alt_write_flash failed. ret_code %d\n",ret_code);

      return ret_code;

  }

  return ret_code;

float Read_flash( alt_flash_fd* fd,int test_offset)

{

  int test_length = 4;

  alt_u8 data_read[test_length];

  int i=0;

  union conv2float read_flash;

  float Ks_para=0.0;

  int ret_code = 0;

    if (!ret_code)

    {

      //ret_code = alt_epcq_controller_read(fd, test_offset, data_read, test_length);

      ret_code=alt_read_flash(fd, test_offset, data_read, test_length);

      if(!ret_code)

      {

        for(i=0;i<4;i++){

          read_flash.V_In[i]=data_read[i];

            printf( "Flash+%d= 0x%08x\n\r",i,read_flash.V_In[i]);

        }

          Ks_para=(float)read_flash.V_Fl;

      }

    }

    alt_flash_close_dev(fd);

    if (ret_code)

    {

      printf( "\nERROR: function READ failed. ret_code %d\n",ret_code);

      //return ret_code;

    }

  return Ks_para;

}