----Ursprungligt meddelande---- Från: [email protected] Datum: 2014-06-23 14:04 Till: <[email protected]> Kopia: <[email protected]> Ärende: Re: [beagleboard] Re: BBB PRU input test
On 6/23/2014 6:52 AM, TJF wrote: > Am Montag, 23. Juni 2014 06:19:52 UTC+2 schrieb [email protected]: >> >> why "set r3, r31.t16" results in r3=0x08 ? >> >> I'd like the pru asm compiler just reject this code as it seems of little >> sense. >> > > Yes, I agree. pasm should output the same error message as for > > MOV r3, r31.t16 > > which is > > ???.p(?) Error: Operand 2 use of .T field not allowed here There is no error from pasm because this is a valid form of the SET command (Format 3, Source Abbreviated). The problem here is that you are reading from R31 using the SET command, which the PRU reference guide explicitly states does not work. The reference guide indicates the source will be NULL, which one might *assume* means all zeros, but in reality could mean just about anything (including something like "the source input pins on the ALU are floating"). So if you *REALLY* want to know, go ask TI if they'll share details about what happens when using R31 as a source for the SET/CLR operations, but I don't think you'll get very far. -- Charles Steinkuehler [email protected] What's the status of PRU support? Where can I find relevant information? TIA /Janne -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
