| 10 REM "Wire register engine reader slave" | |
| 20 REM "The address A, N the number of registers R()" | |
| 30 REM "Maximum number of registers is 32" | |
| 40 N=16 | |
| 50 DIM R(N) | |
| 60 REM "A function in X which is cyclic 1..N" | |
| 70 DEF FNM(X)=(A+X-2)%N+1 | |
| 100 REM "the setup()" | |
| 110 PRINT "Open slave on port 8" | |
| 120 OPEN &7, 8, 1 | |
| 130 A=1 | |
| 200 REM "the loop()" | |
| 210 REM "Wait for command and reply" | |
| 220 FOR I | |
| 230 REM "Call the register state engine" | |
| 240 GOSUB 1000 | |
| 300 REM "Publish the register content" | |
| 310 FOR K=1 TO N | |
| 320 A$(K)=R(FNM(K)) | |
| 330 NEXT K | |
| 340 PRINT &7, A$ | |
| 400 REM "Process commands" | |
| 410 IF AVAIL(7)=0 THEN DELAY 100: CONT | |
| 420 REM "A command was received" | |
| 430 INPUT &7, A$ | |
| 440 REM "First byte is the address, discard if invalid" | |
| 450 IF A$(1)>0 AND A$(1)<=N THEN A=ABS(A$(1)) ELSE CONT | |
| 500 REM "Add command sequences here" | |
| 800 REM "Write received data to the registers" | |
| 810 FOR J=2 TO LEN(A$) | |
| 820 R(FNM(J-1))=A$(J) | |
| 830 NEXT J | |
| 840 NEXT I | |
| 850 END | |
| 1000 REM "Update registers with payload" | |
| 1010 REM "Put your payload code here, loop is only demo" | |
| 1020 FOR K=1 TO N/2 | |
| 1030 R(K)=K | |
| 1040 NEXT K | |
| 1050 RETURN | |