Hi there, I was wondering if anyone can give me some context in how the FT8 decoder works.
I’m seeing a crash inside of the jt9 module on Apple M1 because it is trying to call a callback with an unmapped address (at least that’s what I’m seeing). I can’t seem to figure out where or who sets this callback address (mainly because I’m still learning how to read Fortran). If someone knows the answer, it might help me understand what’s actually wrong. Here’s what I’ve traced so far: When jt9 is executed, it finds the shared memory and attaches to it. Next it does: call multimode_decoder(shared_data%ss,shared_data%id2,local_params,12000) [in jt9a.f90:74] Which subsequently calls: call my_ft8%decode(ft8_decoded,id2,params%nQSOProgress,params%nfqso, … [in decoder.f90:147] As far as I can tell, id2 is passed in for callback arg. subroutine decode(this,callback,iwave,nQSOProgress,nfqso,nftx,newdat, … Then is assigned: (this%callback => callback) But from what I gathered, id2 is a pointer to sample data and not a ft8_decode_callback. As a result this line crashes: call this%callback(sync,nsnr,xdt,f1,msg37,iaptype,qual) [in ft8_decode.f90:200] I can’t imagine a pointer in shared memory being valid so I feel like I’m not understanding this code. Is anyone familiar with this code to give me some context in how it should work? Thanks for the help, alex K6LOT
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