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just measuring fotovoltage witch adc works (with vcc as ref)

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bigalex 2012-10-08 22:16:55 +02:00
parent fb359ed605
commit 05dbf13916
1 changed files with 27 additions and 22 deletions
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49
firmware/main.c
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@ -292,7 +292,7 @@ void do_mode4(void) {
;
void do_mode5(void) {
static bool sample;
static bool discharge;
static timer_t mytimer;
uint16_t led1;
uint16_t led2;
@ -300,7 +300,7 @@ void do_mode5(void) {
if (ModeChanged) { //init after mode change
ModeChanged = false;
ADMUX = (1<<REFS1) | (1<<REFS0); //use internal 1.1V as reference
ADMUX = (1<<REFS0); //use VCC reference
ADCSRA = (1<<ADPS1) | (1<<ADPS0);// prescaler F_CPU/8
ADCSRA |= (1<<ADEN); // ADC enable - turn it on
// do one conversion
@ -308,35 +308,40 @@ void do_mode5(void) {
while (ADCSRA & (1<<ADSC) ) {} //wait for conversion to end
uint16_t __attribute__((unused)) dummy = ADCW; //read once
timer_set(&mytimer, 10);
sample = false;
discharge = true;
};
if (timer_expired(&mytimer)) {
if (sample){
//make a measurement
if (discharge){
//discharge LED
//enable LED channels as output
DDRC |= (1 << PORTC0) | (1 << PORTC1) | (1 << PORTC2) | (1 << PORTC3);
// discharge
PORTC = (PORTC & 0b11110000);
//set C0 and C2 to input (disable pullups)
DDRC &= ~( (1 << PORTC0) | (1 << PORTC2));
//pull ups off
PORTC &= ~( (1 << PORTC0) | (1 << PORTC2));
discharge = false;
} else {
//make a measurement
// single measurement
ADMUX = (ADMUX & ~(0x1F)) | 1; // select channel 1
ADMUX = (ADMUX & ~(0x1F)) | 0; // select channel 0
ADCSRA |= (1<<ADSC); // start single conversion
while (ADCSRA & (1<<ADSC) ) {}; // wait for conversion to end
led1 =ADCW; // read result
ADMUX = (ADMUX & ~(0x1F)) | 3; // select channel 3
ADMUX = (ADMUX & ~(0x1F)) | 2; // select channel 2
ADCSRA |= (1<<ADSC); // start single conversion
while (ADCSRA & (1<<ADSC) ) {}; // wait for conversion to end
led2 =ADCW; // read result
USART0_putc('1');USART0_putc(':');USART0_put_uint16(led1);USART0_crlf();
USART0_putc('2');USART0_putc(':');USART0_put_uint16(led2);USART0_crlf();
sample = false;
} else {
//charge LED
//enable LED channels as output
DDRC |= (1 << PORTC0) | (1 << PORTC1) | (1 << PORTC2) | (1 << PORTC3);
// charge with reverse polarity (C0, C2 = low C1, C3 = high)
PORTC = (PORTC & 0b11110000) | (1 << PORTC1) | (1 << PORTC3);
//set C1 and C3 to input (disable pullups)
DDRC &= ~( (1 << PORTC1) | (1 << PORTC3));
//pull ups off
PORTC &= ~( (1 << PORTC1) | (1 << PORTC3));
sample= true;
};
// USART0_putc('1');USART0_putc(':');USART0_put_uint16(led1);USART0_crlf();
// USART0_putc('2');USART0_putc(':');USART0_put_uint16(led2);USART0_crlf();
music_setNote(500+(0x1ff-led1)*10,0);
discharge = true;
}
timer_set(&mytimer, 1);
}; //end if timer_expired