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Altera_Forum's avatar
Altera_Forum
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16 years ago

How to write in EPCS

Hello, I am a newbie with Nios II. I'm doing a robotic project with a Cyclone and an EPCS4 flash memory. I've added an EPCS controller in my SOPC Builder system. I has to read...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi there,

If your project is using the reduced drivers option you will have to define the symbol ALT_USE_EPCS_FLASH in the system library properties. Then include the header file <altera_avalon_epcs_flash_controller.h> in your source code. Here&#39;s a snippet from my code as a starter for ten:

# include <altera_avalon_epcs_flash_controller.h># include <sys\alt_flash.h>

static alt_flash_fd *p_epcs_fd;

static flash_region *p_epcs_reg_info;

static int num_epcs_regs;

void epcs_open(void)

{

<blockquote>p_epcs_fd=alt_flash_open_dev(EPCS_CONTROLLER_NAME); <blockquote>// Get pointer to flash info structure</blockquote>

alt_epcs_flash_get_info(p_epcs_fd, &p_epcs_reg_info, &num_epcs_regs); <blockquote>// Verify flash details</blockquote></blockquote>}

You could try compiliing and running this, then display the region info to see if it makes sense.

I then go on to use the functions alt_epcs_flash_erase_block, alt_epcs_flash_write_block and alt_epcs_flash_read with p_epcs_fd as the first argument in each case.

I hope this helps.

Have fun.