README.md

https://github.com/diegoherranz/sdcc-examples

blink_led.c

// Copyright (C) 2014 Diego Herranz

#define NO_BIT_DEFINES
//#include <pic14regs.h>
#include <pic12lf1822.h>
#include <stdint.h> 

// Oscillator Selection bits (INTOSCIO oscillator: I/O function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN),
// disable watchdog,
// and disable low voltage programming.
// The rest of fuses are left as default.
__code uint16_t __at (_CONFIG1) __configword = _FOSC_INTOSC & _WDTE_OFF & _PWRTE_ON;

#define LED_PORT PORTAbits.RA2
#define LED_TRIS TRISAbits.TRISA2

// Uncalibrated delay, just waits a number of for-loop iterations
void delay(uint16_t iterations)
{
	uint16_t i;
	for (i = 0; i < iterations; i++) {
		// Prevent this loop from being optimized away.
		__asm nop __endasm;
	}
}

void main(void)
{
	//default 500kHz
	OSCCONbits.IRCF = 0xf;//16MHz
	LED_TRIS = 0; // Pin as output
	LED_PORT = 0; // LED off
	
	while (1) {
		LED_PORT = 1; // LED On
		delay(300); // ~500ms @ 4MHz
		LED_PORT = 0; // LED Off
		delay(300); // ~500ms @ 4MHz
	}
}

Makefile

SRC=blink_led.c

CC=sdcc
FAMILY=pic14
PROC=12lf1822

all: $(SRC:.c=.hex)

$(SRC:.c=.hex): $(SRC)
	$(CC) --use-non-free -m$(FAMILY) -p$(PROC) $^

clean:
	rm -f $(SRC:.c=.asm) $(SRC:.c=.cod) $(SRC:.c=.hex) $(SRC:.c=.lst) $(SRC:.c=.o)

.PHONY: all clean