Hi, I have some simple examples of direct reading/writing under 3.8 (setting mode 6, exclusive use etc)..
https://github.com/dresco/pru_examples Have the device tree definitions have changed for 3.1x? I've not yet successfully built my PRU code under the new 3.14 kernel, so perhaps bone-pinmux-helper is no longer an option? Regards, Jon On Thursday, 25 September 2014 04:12:53 UTC+1, Cedric Malitte wrote: > > Ok finally managed to build a dts using compatible='gpio-leds' for outputs > and I now have a 15Mhz output. > > I'll investigate why when I try to use pru code compiled from C, the > signal has a weird shape on the scope but using asm, it's a regular one. > > For inputs, I do not know yet if I should use compatible="gpio-keys" or > something else, I did not find anything related to this yet. > > > > 2014-09-24 13:17 GMT-04:00 Cedric Malitte <cedric....@gmail.com > <javascript:>>: > >> Hi, >> >> so trying to get my things up and running, I wrote a program for the PRU >> in asm to toggle 2 pins and read 4. >> >> In C, I manage to manipulate them because I'm using GPIO. >> But in asm... I try to interact with r30 and r31, and nothing really >> happens... >> >> I"m with kernel 3.15. >> >> Could someone guide me ? >> I think I have to add a dts to declare pins and pinmux, but I feel a bit >> lost on this point. >> >> In case, this is my asm source >> >> #include "pru.h" >> #include "pru_macros.hp" >> >> .origin 0 >> .entrypoint MAIN >> >> >> MAIN: >> >> /* enable ocp wide accesses */ >> >> LBCO r0, CONST_PRUCFG, 4, 4 >> CLR r0, r0, 4 >> SBCO r0, CONST_PRUCFG, 4, 4 >> >> /* prepared pru to host shared memory */ >> >> MOV r0, 0x000000120 >> MOV r1, CTPPR_0 >> ST32 r0, r1 >> >> MOV r0, 0x00100000 >> MOV r1, CTPPR_1 >> ST32 r0, r1 >> >> >> MOV r10, 0 >> MOV r11, 0 >> MOV r12, 0 >> /* main */ >> LOOP1: >> SET r30.t15 /* CLK high */ >> MOV r10, r31.b0 /* Read in the data */ >> >> QBBC CHKSENSOR2, r10.b0.t0 /* if r10.0, set r11.0 */ >> SET r11, 0 >> CHKSENSOR2: >> QBBC CHKSENSOR3, r10.b0.t1 /* if r10.1, set r11.15 */ >> SET r11, 15 >> CHKSENSOR3: >> QBBC CHKSENSOR4, r10.b0.t2 /* if r10.2, set r12.0 */ >> SET r12, 0 >> CHKSENSOR4: >> QBBC ENDCHECK, r10.b0.t3 /* if r10.3, set r12.15 */ >> SET r12, 15 >> >> ENDCHECK: >> CLR r30.t15 /* CLK low */ >> LSL r11, r11, 1 >> LSL r12, r12, 1 >> ADD r0, r0, 1 >> JMP LOOP1 >> /* store results from r10,r11 into host memory */ >> >> SBCO r10, CONST_PRUSHAREDRAM, 0, 8 >> >> /* signal cpu we are done (never reached) */ >> >> MOV r31.b0, PRU0_ARM_INTERRUPT + 16 >> HALT >> >> >> Thanks, >> >> Cedric >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to a topic in the >> Google Groups "BeagleBoard" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/beagleboard/DvlQWGZ5VEs/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> beagleboard...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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. For more options, visit https://groups.google.com/d/optout.
