====== С compiler for PIC16 microcontrollers ======
Some time ago I developed a {{pic:pic16-0.1.tgz | simple C compiler}}
for Microchip PIC16 microcontrollers.

The package contains:
  * C compiler
  * Assembler with [[pic:pic16-opcodes | original mnemonics]]
  * Disassembler
  * Target defines for PIC 12C5xx family

===== Simplified language =====
The language is very simplified.

1) No structs, unions and typedefs. No float point.

2) Functions may have not more that two arguments.
The total size of arguments cannot exceed 4 bytes.

3) Size of long is 4 bytes, short - 2 bytes,
char and int - 1 byte.  The simple pointer has the size of 1 byte,
far pointer - 2 bytes.

4) The type of pointer to pointer is equivalent to (char*) for simple
pointers, and (short*) for far pointers.

5) All functions must be declared before use. The argument lists
in function declarations are not supported.

6) Bit operations are supported, for example:

	if (a.1)
		b.4 = 1;

The only operations for bits are:
   * assignment of zero (a.N = 0);
   * assignment of one (a.N = 1);
   * xor with one (a.N ^= 1);
   * conditional check (if (a.N) or if (! a.N)).

7) Direct placement of data and functions is supported,
for example:

	short PROD @ 0x18;
	void startup () @ 0
	{ ... }

The startup() function will be placed in command memory at address 0,
the variable PROD references the data memory at address 18h.