Hello!
I'm trying to make multi channel conversation for 2 ADC. The time diagram is added in attachment.
I need to make 2 measures (measuring of ADC0 and measuring of ADC7) per one period of triggering signal. I use PWM (Pin PB7, Atmega 2560) as trigger signal.
But now it makes just 1 measure per 1 period of time. Firstly - ADC0, secondly - ADC7. For the control, I use terminal on my computer.
This is the part of the code:
//Инициализируем АЦП
void ADCInit(void) {
ADCSRA|=(1<<ADEN);
ADMUX=(1<<MUX2)|(1<<MUX1)|(1<<MUX0)|(1<<REFS0); //на канал ADC7
ADCSRA|=(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0); //делитель=128
ADCSRA|=(1<<ADATE);
ADCSRA|=(1<<ADIE);//разрешаем прерывания
DIDR0|=(1<<ADC0D)|(1<<ADC7D);
}
int main(void) {
DDRB=(1<<PORTB7)|(1<<PORTB6);
//DDRE=(1<<PORTE5)|(1<<PORTE4)|(1<<PORTE3);
PWM_ini(); //Инициализация ШИМ
UART0_Init(); //Инициализация порта на uART
ADCInit(); //Инициализация АЦП
sei();
ADCSRA|=(1<<ADSC);
while(1) {
}
}
ISR(TIMER1_COMPC_vect)
{
uint8_t theLOW=ADCL;
uint16_t ADC_ten_bits=ADCH<<8|theLOW;
switch (ADMUX)
{
case 0b01000111:
n=(float) ADC_ten_bits/204.8;// 1024/5=204,8
uart0_tr((unsigned char)n+0x30);
uart0_tr('.');
uart0_tr((unsigned char)(n*10)%10+0x30);
uart0_tr((unsigned char)(n*100)%10+0x30);
uart0_tr((unsigned char)(n*1000)%10+0x30);
uart0_tr(0x20); //делаем "Space". "0x0D" - это Пробел в ASCII коде
ADMUX=0b01000000;
break;
case 0b01000000:
n=(float) ADC_ten_bits/204.8;// 1024/5=204,8
uart0_tr((unsigned char)n+0x30);
uart0_tr('.');
uart0_tr((unsigned char)(n*10)%10+0x30);
uart0_tr((unsigned char)(n*100)%10+0x30);
uart0_tr((unsigned char)(n*1000)%10+0x30);
uart0_tr(0x0D); //делаем "Enter". "0x0D" - это Enter в ASCII коде
ADMUX=0b01000111;
break;
default:
break;
}
ADCSRA|=(1<<ADSC);
//_delay_ms(100);
}
ISR(ADC_vect)
{
}As I understood from datasheet, when I use autotriggering, it is not possible to start the next conversation.
Are there any other solutions?
Thanks in advanced!
