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Altera_Forum
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17 years ago

Help:Cann't read or write EPCS in Nios II,why?

my system includes Flash,EPCS,etc,and has a EPCS controller.i want to read and write the EPCS in the nios.i tried to open the device using "alt_flash_open_dev()",but it's alway wrong--"can not open t...
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Altera_Forum
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16 years ago

WDB is correct that enabling "small device drivers" for your system library will essentially disable the EPCS controller and it will fail to open. You can however still use the "small device drivers" option if you add the following macro to your system library build:

"-DALT_USE_EPCS_FLASH"

To understand why, simply look at the file:

C:\altera\81\ip\altera\sopc_builder_ip\altera_avalon_epcs_flash_controller\HAL\inc\altera_avalon_epcs_flash_controller.h

You'll see the line:

# if (!defined(ALT_USE_SMALL_DRIVERS) && !defined(ALT_SIM_OPTIMIZE)) || defined ALT_USE_EPCS_FLASH

Good luck,

Jake