14 Binary Programs

With the use of a customized 6811 assembler program, IC allows the use of machine language programs within the C environment. There are two ways that machine language programs may be incorporated:

1. Programs may be called from C as if they were C functions.

2. Programs may install themselves into the interrupt structure of the 6811, running repetitiously or when invoked due to a hardware or software interrupt.

When operating as a function, the interface between C and a binary program is limited: a binary program must be given one integer as an argument, and will return an integer as its return value. However, programs in a binary file can declare any number of global integer variables in the C environment. Also, the binary program can use its argument as a pointer to a C data structure.

• 14.1 The Binary Source File
  • 14.1.1 Declaring Variables in Binary Files
  • 14.1.2 Declaring an Initialization Program
• 14.2 Interrupt-Driven Binary Programs
• 14.3 The Binary Object File
• 14.4 Loading an ICB File
• 14.5 Passing Array Pointers to a Binary Program