problem using epcs.c in SDK library

[Altera_Forum]

Hello,  

I have problem calling "nr_epcs_is_device_present()" function which I copied & pasted from epcs.c in SDK library.  As far as I can see from the original source, The first thing it does in there is calling "nr_epcs_set_cs()" function to set chip select.  After that, it is calling "nr_epcs_txchar(na_epcs_wren)" function to send WRITE ENABLE command.  However, below loop in "nr_epcs_txchar(na_epcs_wren)" function continues forever. ---------------------- while (!(na_epcs_controller->np_epcsstatus & np_epcsstatus_rrdy_mask)); ----------------------  The base address of my epcs_controller is 0x00900000:  typedef volatile struct{  int np_dummy[256]; // EPCS component fills lower 1k with code  int np_epcsrxdata; // Read-only, 1-16 bit  int np_epcstxdata; // Write-only, same width as rxdata  int np_epcsstatus; // Read-only, 9-bit  int np_epcscontrol; // Read/Write, 9-bit  int np_epcsreserved; // reserved  int np_epcsslaveselect; // Read/Write, 1-16 bit, master only  int np_epcsendofpacket; // Read/write, same width as txdata, rxdata. } np_epcs;  np_epcs* na_epcs_controller = (np_epcs*)(0x00900000);  I am using NIOS II, and I heard that this legacy SDK is for NIOS. Is this the reason for my problem?  If so, I would like to hear some hints as to modifying the above source.

[Altera_Forum]

Hello, 

I solved my problem.  It said on p12-4 of "Programming Model, Nios II Processor Reference Handbook" that  "Altera does not publish the usage of the control and data registers. To access the EPCS device, you must use the HAL drivers provided by Altera."  What I really wanted to do was to erase memory of EPCS, so I simply called alt_epcs_flash_erase_block() function of HAL api, and it worked.  I guess the codes I refferred to at the beginning was for NIOS, not NIOS II..