可编程控制的LED

第4步编程

/* ----------------------------------------------------------------------- 
 * Title:    flick led 
 * Author:   Alexander Weber <alexander.weber.0 at gmail.com> 
 * Date:     21.02.2007 
 * Hardware: ATtiny13v 
 * Software: WinAVR 20060421 
 */
    
// define as -D switch 
//#define F_CPU 1200000 // Taktfrequenz: 1.2MHz, internal oscillator 
    
    
#include <avr/io.h> 
#include <util/delay.h> 
    
#define TRUE 1 
#define FALSE 0  
#define ON 1 
#define OFF 0 
    
// use PB2 for led, pin 7 
#define LED_BIT 2 
// use PB3 to enable ldr, pin 2 
#define ADC_ENA_BIT 3 
// pause 
#define PAUSE 25 
// select ADC2, PB4, pin 3 
#define CHANNEL 2 
// values over threshold are recorded as "on" 
#define THRESHOLD 800 
// storage for recorded values 
#define MAX 400 
static uint8_t values[MAX / 8]; 
    
    
/* 
 * get_adc 
 * Return the 10bit value of the selected adc channel. 
 */
uint16_t get_adc(uint8_t channel) { 
    
    // enable voltage for adc  
    PORTB |= (1 << ADC_ENA_BIT);   
        
    // ADC setup 
    ADCSRA =  
        (1 << ADEN) |                 // enable ADC 
        (1 << ADPS1) | (1 << ADPS0);    // set prescaler to 8    
            
    // select channel 
    ADMUX = channel; 
        
    // select reference voltage 
    // ADMUX |= (1 << REFS0); // use internal reference 
    
    // warm up the ADC, discard the first conversion 
    ADCSRA |= (1 << ADSC); 
    while (ADCSRA & (1 << ADSC));  
        
    ADCSRA |= (1 << ADSC);                // start single conversion 
    while (ADCSRA & (1 << ADSC));         // wait until conversion is done 
            
    PORTB &= ~(1 << ADC_ENA_BIT);     // disable voltage for adc 
            
    return ADCW; 
} 
    
    
    
int main(void) { 
        
    uint16_t i = 0; 
    uint16_t count = 0; 
    uint8_t light = OFF; 
    uint8_t last_light = OFF; 
    uint16_t last_time = 0; 
    uint8_t programming = TRUE; 
        
    // define LED and ADC enable as outputs 
    DDRB |= (1 << LED_BIT) | 
            (1 <<ADC_ENA_BIT);     
        
    // intro 
    for (i = 0; i < 5; i++) { 
        PORTB |= (1 << LED_BIT);   
        _delay_ms(200); 
        PORTB &= ~(1 << LED_BIT); 
        _delay_ms(200); 
    } 
    for (i = 0; i < 5; i++) { 
        _delay_ms(100); 
    } 
    
    while (1) {  
                
        if (programming) { 
            // signal that we are ready to program 
            for (i = 0; i < 5; i++) { 
                PORTB |= (1 << LED_BIT);   
                _delay_ms(40); 
                PORTB &= ~(1 << LED_BIT); 
                _delay_ms(40); 
            } 
            // now read the ldr and store it 
            for (i = 0; i < MAX; i++) { 
                if (get_adc(CHANNEL) > THRESHOLD) { 
                    values[i / 8] |= (1 << (i % 8)); 
                    PORTB |= (1 << LED_BIT);   
                } 
                else { 
                    values[i / 8] &= ~(1 << (i % 8)); 
                    PORTB &= ~(1 << LED_BIT); 
                }                            
                _delay_ms(PAUSE); 
            } 
            // signal that we are finished with programming 
            for (i = 0; i < 5; i++) { 
                PORTB |= (1 << LED_BIT);   
                _delay_ms(40); 
                PORTB &= ~(1 << LED_BIT); 
                _delay_ms(40); 
            } 
            // switch to playback 
            programming = FALSE; 
            count = 0;               
        }        
        else {   
            // have we detected a change? 
            light = (get_adc(CHANNEL) > THRESHOLD) ? ON : OFF;            
            if (light != last_light) { 
                // when was the last change? 
                if ((count - last_time) == 10) { 
                    programming = TRUE;         // switch to programming mode 
                } 
                else { 
                    last_time = count; 
                } 
            } 
            last_light = light; 
                
            // replay recorded lights 
            if (values[count / 8] & (1 << (count % 8))) { 
                PORTB |= (1 << LED_BIT);   
            } 
            else { 
                PORTB &= ~(1 << LED_BIT); 
            } 
            _delay_ms(PAUSE); 
            count++; 
            if (count == MAX) { 
                count = 0; 
            }        
        } 
            
    } 
    
    return 0; 
        
}

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