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I've hacked at the SCI echo example in the original release of the Small C port so that the SCI receive portion is interrupt driven. The resultant assembly output of the compiler needs to be edited so that the interrupt service routine ends with an RTI instruction instead of an RTS instruction. The vecinit.asm file needs to be edited to point the appropriate vector to the ISR. The interrupt service routine needs to change global variables for the change to be seen by the main program. There are more elegant and faster ways to do both of these, but as it is, the Small C compiler port can be used with interrupts. The ultimate would be to add RTI support which is lacking in Small C out of the box from the original source (see CC4.c where the assembly instructions for the p-codes are). The attached zip file contains the C source, the modified vecinit3.asm and testsci3.asm. Happy hacking. --david __________________________________________________ | |||
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