Which assembler are you using? It should have warned you that "loop weiter" body must be at least two instructions, whereas you have zero.
Also, you cannot nest HW-assisted loops. Regards, Dimitar On Thursday, May 13, 2021 at 9:36:18 PM UTC+3 Kasimir wrote: > HI Mark, > was trying to use the loop instruction ..... > .global ausgabe > ausgabe: > ldi r18, 0 ; initialisation > > ldi r30, 0x10 ; debug > ldi r17, 0x00 ; debug > mov r20, r15 ; save start addresss > mov r21, r14 ; save number of pattern > naechster: > loop next_pattern, r14 ; for each pattern > lbbo &r30, r15, 4, 1 ; output (r15) = pattern > lbbo &r17, r15, 0, 2 ; load number of delay loops > loop weiter, R17 ; delay loop > weiter: > add r15, r15, 5 ; increment address pointer by 5 ( next > data structure element ) > next_pattern: > mov r15, r20 ; load saved start address in address > pointer > mov r14, r21 ; load saved number of pattern in pattern > counter > lbbo &r18, r16, 0, 1 ; check if stop request > > or r30, r30, (1<<4) ; debug > qbeq naechster, r18, 0 ; if handshake[0] == 0 continue > jmp r3.w2 ; otherwise return r3 contains return > address > > > ********************************************************************************** > I used prudebug to test the behavior. > So the loop instruction is not known ( UNKNOWN in disassembler list ) > Is not a solution for Beaglebone black. > Assembler did not warn or complain. > > Bottom line ... independent of the above code, I'm missing the 200MHz > performance, > I'm far away, seems to be 20:1 .... if I think in 5nsec instruction time > cycles for register operations. > > There is something else .... up to now no idea what it can be. > > Thanks for help and thinking > Kasimir > > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/adc7ae89-f733-4ca9-bea5-35617341ea56n%40googlegroups.com.
