Reading EPCS

This threat discussion below seems is demotrating the usage of the read and write EPCS as well.

http://www.alteraforum.com/forum/showthread.php?t=18461

Thanks, tony_stark.

I did read the post, but still not working. I tried below:

==

static flash_region *p_epcs_reg_info;

static int num_epcs_regs;

alt_u8 buf[16];

alt_u8 buf2[16] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F};

alt_flash_fd* epcs = alt_flash_open_dev(EPCS_FLASH_NAME);

int error = alt_epcs_flash_get_info(epcs, &p_epcs_reg_info, &num_epcs_regs);

alt_epcs_flash_erase_block(epcs,0);

alt_epcs_flash_write_block(epcs, 0, 0, (void*)buf2, 16);

alt_epcs_flash_read(epcs, 0, (void*)buf, 16);

==

As for p_epcs_reg_info & num_epcs_regs, I get below which seems OK:

offset=0, region_size=2097152, number_of_blocks=32, block_size=65536, num_epcs_regs=1

I get error = 0, epcs is not NULL, so there seems to be no error.

But I still get 0x14 for buf[0] to buf[15]..

Is there anything else I should look for?

Thanks in advance.

Did you check whether alt_flash_open_dev() returns a valid handle and if alt_epcs_flash_get_info() returns no error?

Your posted code misses these points

Thanks Cris72,

Yes, I did. As I wrote above,

==

alt_flash_fd* epcs = alt_flash_open_dev(EPCS_FLASH_NAME);

int error = alt_epcs_flash_get_info(epcs, &p_epcs_reg_info, &num_epcs_regs);

==

epcs was not NULL & error = 0

Hello, I found out my problem.

I was not connecting nCS of EPCS properly.

Assigned it to "nCSO" in my top module, but passing "n_CSO" to the lower module.

I wonder why Quartus did not raise an error because "n_CSO" exists nowhere in my code...

It was bit tricky to find out, because configuration works totally fine.

I was not aware that the problem could be on my FPGA side.

Thanks,

--- Quote Start ---

Hello, I found out my problem.

I was not connecting nCS of EPCS properly.

Assigned it to "nCSO" in my top module, but passing "n_CSO" to the lower module.

I wonder why Quartus did not raise an error because "n_CSO" exists nowhere in my code...

It was bit tricky to find out, because configuration works totally fine.

I was not aware that the problem could be on my FPGA side.

Thanks,

--- Quote End ---

good one! we all also never aware something not right with the FPGa and we focus on the software only :D