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Altera_Forum
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15 years ago

Flash Memory

Hello. I am using Altera DE2 Board with Flash (1Mb). I want to know how to store data into and read data from flash memory. For example, I want to store 1-10 into the flash. Then, I will read the num...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

First of all init the flash device and possibly get extra info about the flash device, like block size: 


    flash_region   *regions;
    int            numRegions;
    int  error = 0;
    pFlashDevice = alt_flash_open_dev(FLASH_CONTROLLER_NAME);
    if (pFlashDevice <= 0)
        error = -1;
    if (!error) 
        error = alt_epcs_flash_get_info(pFlashDevice, &regions, &numRegions);
     if (!error) {
        flash_block_size = regions->block_size;
        flash_max_addr = regions->region_size;
This is for erasing a single block: 

alt_epcs_flash_erase_block(pFlashDevice, block_address);
This is for writing any data to a previously erased area: 

int buf = { 1, 2,3,4,5,6,7,8,9,10 };
rv = alt_epcs_flash_write_block(pFlashDevice, block_address,
         data_offset_inside_block , buf, 10);
Then, read back data with: 

alt_epcs_flash_read(pFlashDevice, addr, buf, len);