Programming NIOSII interfaced with custom component, using Avalon MM Interface

[Altera_Forum]

Hello Everyone, 

 I am trying to interface NIOS II with a custom component using Avalon MM Inferface where NIOS acts as Master. During the C coding, how do i get access to the function to send/receive data through the Avalon MM interface ? Can i get direct access to the ports dedicated for the interface ? and Do i need to follow some particular protocol while C coding for the interface ?

[Altera_Forum]

I implemented 16 Bit 128 Tap FIR Filter with two approach: 

 First with implementing the FIR on NIOS II core using C language (Software FIR Design). Second with implementing FIR as Hardware Accelerator on FPGA which get i/p values & coeff from NIOS II core and returns the the result to NIOS II core (Hardware FIR Design).  Below are the links to project. Hope it helps.  Software FIR Design: https://www.youtube.com/watch?v=sjjbu-lhzpc  Hardware FIR Design: https://www.youtube.com/watch?v=-egwtmwg0ku

[Altera_Forum]

Hello everyone 

 I need to sent 5 different 16 bits data in 5 five clock cycles to my costum component. My Altera board is driven by a 50MHz oscillator (a period of 0.02 µs).  so should I write   IOWR_16DIRECT(BASE , OFFSET, DATA_1); usleep(0.02); IOWR_16DIRECT(BASE , OFFSET, DATA_2); usleep(0.02); . . . IOWR_16DIRECT(BASE , OFFSET, DATA_5);

[Altera_Forum]

--- Quote Start ---  Hi,  I succeeded in implementing the system on board. My custom component is a 128 tap FIR filter which is to be started by NIOS and stimuli is also provided by nios. I made the custom component in Qsys and implemented the system. Now i am able to write the c code successfully on the NIOS without any tool errors.  But, i am not able to communicate properly. Below is my code:   int var =1234;  IOWR(20496,0,11);    printf("%d\n",var); //prints 1234    var = IORD(20496,0);    printf("%d\n",var); // prints 0  When I am reading the same address and offset, it gives 0.  --- Quote End ---    HI,  I'm currently facing the issues as mentioned in the quote above. May I know the way you resolve it?  Thanks  HY