source: firmware/FSC/usb_src/atmega_adc.c@ 18086

Last change on this file since 18086 was 10109, checked in by lutz, 14 years ago
niculin & dom debugged quite some stuff
File size: 804 bytes
Line 
1#include "atmega_adc.h"
2#include "typedefs.h"
3
4void atmega_adc_init(void)
5{
6//ADC einschalten
7 ADCSRA |= (1<<ADPS2) | (1<<ADPS1); // ADC_clk = 125kHz
8 ADCSRA &= ~(1<<ADPS0);
9 // normal conversion takes: 13 adc_clk cycles = 104us
10 // 1st conversion takes longer: 25 clk cycles = 200us
11 ADCSRA |= 1<<ADATE; // autotrigger enable
12 SFIOR &= ~(0xE0); //ADTS=000 --> free running mode
13 ADCSRA |= (1<<ADEN); // ADC aktivieren
14
15 ADMUX &= ~(1<<REFS0);
16 ADMUX &= ~(1<<REFS1); //REFS = 00 --> use external reference voltage.
17 ADMUX |= 1<<ADLAR; //ADLAR =1 --> left adjust ac result in ADCH register --> 8bit resolution only.
18 ADMUX |= (0x1F & 0x06); //MUX = 0x06 --> Pin ADC6 = PA6 is used as ADC input pin.
19
20 ADCSRA |= (1<<ADSC); // start 1st conversion
21
22}
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