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Search found 4 results on 1 pages for 'nios'.

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• How to do timer with Nios II assembly?

  - by Nick Rosencrantz

  I've got an assignment in a computer engineering course that I don't fully understand since it is so large. Anyway I started coding the parts of it and it seems we should make code for some sort of timer. I've started put together the subroutine for snaptime but I'm not sure what I want: .equ timer, 0x920 .global snaptime .text .align 2 snaptime: movia r8,timer # basadressen till timern stw r0,12(r8) # sparar 0 till snapl movi r9,0b0110 # spara 6 i r9 stw r9,16(r8) # spara r9 movi ... ? andi r10,r10,0xFFFF The manual for Nios II assembly is here and the C code for what I'm trying to do is: #define TIMER_1_BASE ((volatile unsigned int*) 0x920) int snaptime (void) { int snaphight; int snaplow; int snap; TIMER_1_BASE[4]=0; snaphigh = TIMER_1_BASE[5] & 0xffffff; snaplow = TIMER_1_BASE[4] & 0xffffff; snap = snaphigh*65536+snaplow; return (snap); } Perhaps you can inspect the C which should be properly defined and see how I make it with assembly since the spec says it should be assembly.

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• How to interface NIOS-II with external vhdl module

  - by bobbyb

  I'm looking for a bus to connect a nios-II core to an external vhdl module i have written. I can probably do it with GPIOs but this seems like a poor way of doing it and pretty much requires me to implement my own bus from scratch. Does altera provide any sort of bus like structure in SOPC I could use to do this? Thanks!

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• Compiling Assembly Manually [migrated]

  - by John Smith

  I am having trouble with translating a specific line in assembly to machine code for the Nios II. I have successfully compiled these lines: START_TIMER = 0xF68C r0 = 0x0 r8 = 0x8 label = 50000 addi r8, r8, %lo(label) - 01000 01000 1100001101010000 000100 subi r8, r8, 1 - 01000 01000 1111111111111111 000100 bne r8, r0, START_TIMER - 01000 00000 1111011010001100 011110 The line in question that I have trouble with is this one: orhi r8, r0, %hiadj(label) As explained in the handbook linked above, "%lo" means "Extract bits [15..0] of immed32" and "%hiadj" means "Extract bits [31..16] and adds bit 15 of immed32". However, 50000 in binary is 1100001101010000, and is therefore a 16 bit number. As far as I can see, it doesn't contain any bits between 16 and 31. I tried with 0000000000000001, but it's incorrect. What am I doing wrong?

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• Need help for this syntax: "#define LEDs (char *) 0x0003010"

  - by Noge

  I'm doing programming of a softcore processor, Nios II from Altera, below is the code in one of the tutorial, I manage to get the code working by testing it on the hardware (DE2 board), however, I could not understand the code. #define Switches (volatile char *) 0x0003000 #define LEDs (char *) 0x0003010 void main() { while (1) *LEDs = *Switches; } What I know about #define is that, it is either used to define a constant, or a macro, but why in the above code, there are casting like, (char *) 0x0003010, in #define? why the 2 constants, Switches and LEDs act like a variable instead of a constant? Thanks in advance !

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