| 0,0 → 1,76 |
|---|
| /********************************************* |
| * vim: set sw=8 ts=8 si : |
| * Author: Guido Socher, Copyright: GPL |
| * This program is to test the led connected to |
| * PC5. |
| * See http://linuxfocus.org/English/November2004/ |
| * for details. |
| * Chip type : ATMEGA8 |
| * Clock frequency : Internal clock 1 Mhz (factory default) |
| *********************************************/ |
| #include <avr/io.h> |
| #include <inttypes.h> |
| #define F_CPU 1000000UL // 1 MHz |
| #include <avr/delay.h> |
| |
| |
| /* compatibilty macros for old style */ |
| #ifndef cbi |
| #define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit)) |
| #endif |
| |
| #ifndef sbi |
| #define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit)) |
| #endif |
| |
| |
| void delay_ms(unsigned int ms) |
| /* delay for a minimum of <ms> */ |
| { |
| // we use a calibrated macro. This is more |
| // accurate and not so much compiler dependent |
| // as self made code. |
| while(ms){ |
| _delay_ms(0.96); |
| ms--; |
| } |
| } |
| |
| |
| /* new style */ |
| int main(void) |
| { |
| /* INITIALIZE */ |
| /* enable PC5 as output */ |
| DDRC|= (1<<DDC5); |
| |
| /* PC5 is 5 (see file include/avr/iom8.h) and 1<<PC5 is 00100000 |
| * This can also be written as _BV(PC5)*/ |
| while (1) { |
| /* led on, pin=0 */ |
| PORTC &= ~(1<<PC5); |
| delay_ms(500); |
| /* set output to 5V, LED off */ |
| PORTC|= (1<<PC5); |
| delay_ms(500); |
| } |
| return(0); |
| } |
| |
| |
| // // old style now depricated: |
| // int main(void) |
| // { |
| // // enable PC5 as output |
| // sbi(DDRC,PC5); |
| // while (1) { |
| // // led on, pin=0 |
| // cbi(PORTC,PC5); |
| // delay_ms(500); |
| // // set output to 5V, LED off |
| // sbi(PORTC,PC5); |
| // delay_ms(500); |
| // } |
| // return(0); |
| // } |
| // // end of old style |