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41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
/*
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* Sim65 trace functionality example.
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*
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* Description
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* -----------
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*
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* The easiest way to use tracing in sim65 is to pass the '--trace' option
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* to sim65 while starting a program.
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*
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* However, it is also possiblke to enable and disable the trace functionality
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* at runtime, from within the C code itself. This can be useful to produce
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* runtime traces of small code fragments for debugging purposes.
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*
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* In this example, We use the TRACE_ON and TRACE_OFF macros provided in sim65.h
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* to trace what the CPU is doing during a single statement: the assignment of
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* a constant to a global variable.
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*
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* Running the example
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* -------------------
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*
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* cl65 -t sim6502 -O trace_example.c -o trace_example.prg
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* sim65 trace_example.prg
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*
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* Compiling and running the program like this will produce a trace of six 6502 instructions.
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* The first four instructions correspond to the 'x = 0x1234' assignment statement.
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* The last two instructions (ending in a store to address $FFCB) disable the trace facility.
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*
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*/
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#include <sim65.h>
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unsigned x;
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int main(void)
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{
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TRACE_ON();
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x = 0x1234;
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TRACE_OFF();
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return 0;
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}
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