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Forum: FPGA, VHDL & Verilog Read/Write EPCS64 flash from Nios II


von jeorges F. (Company: xlue) (khal1985)


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Hi all,

Actually, I'm trying to write/read my flash device using the HAL 
functions.

After opening the device, I write data into the EPCS64 using 
alt_write_flash_block, then i read it back using alt_read_flash.
The problem i have is that the data read/ written shown in the Nios II 
console are not the same.
The code for writing and reading is below:
1
int Write_flash( alt_flash_fd* fd, float *Ks_para,int test_offset)
2
{
3
  int i;
4
  int ret_code = 0;
5
6
  alt_u8 *ptr_ks=(alt_u8*) Ks_para;
7
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  int test_length = sizeof(Ks_para);
9
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  // before writing in a sector, we should erase it before
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  ret_code=alt_erase_flash_block(fd, test_offset,regions->block_size);
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  if(!ret_code){
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    for(i=0;i<test_length;i++){
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        printf( "data_written[%d]= 0x%08x\n\r",i,ptr_ks[i]);
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    }
17
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    //ret_code = alt_epcq_controller_write_block(fd, test_offset, test_offset,ptr_ks, test_length);
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    ret_code=alt_write_flash_block(fd,test_offset,test_offset,ptr_ks,test_length);
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  }
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  if (ret_code)
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  {
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      printf( "\nERROR: function alt_write_flash failed. ret_code %d\n",ret_code);
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      return ret_code;
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  }
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  return ret_code;
1
float Read_flash( alt_flash_fd* fd,int test_offset)
2
{
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  int test_length = 4;
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  alt_u8 data_read[test_length];
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  int i=0;
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  union conv2float read_flash;
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  float Ks_para=0.0;
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  int ret_code = 0;
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    if (!ret_code)
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    {
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      //ret_code = alt_epcq_controller_read(fd, test_offset, data_read, test_length);
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      ret_code=alt_read_flash(fd, test_offset, data_read, test_length);
14
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      if(!ret_code)
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      {
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        for(i=0;i<4;i++){
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          read_flash.V_In[i]=data_read[i];
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            printf( "Flash+%d= 0x%08x\n\r",i,read_flash.V_In[i]);
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        }
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          Ks_para=(float)read_flash.V_Fl;
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      }
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    }
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    alt_flash_close_dev(fd);
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    if (ret_code)
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    {
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      printf( "\nERROR: function READ failed. ret_code %d\n",ret_code);
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      //return ret_code;
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    }
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  return Ks_para;
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}

Can you help please if you have any idea ?

Thank in advance.
Best regards

von jeorges F. (Company: xlue) (khal1985)


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I want just to precise that in debug mode, I can see that the location 
where I write changed but with wrong values.
For example, I'm writing 0x40228f5c to 04FC0000 address, but I can see 
this :
04FC0000 2E479120 FFFFFFFF FFFFFFFF FFFFFFFF

I don't find an explication why.

Do you have any suggestion please?

Thanks

Best regards

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