void InitJoystick(void) {
// Init ADC interface
InitADC12();
// A7 as analog input
P6SEL |= BIT7; // P6.7 ADC10 function
P6DIR = 0x0; // P6.7 input direction
// P2.6 as input
P2SEL &= ~BIT6; // P2.6 as GPIO
P2DIR &= ~BIT6; // P2.6 as input
}
/*--------------------------------------------------------------------------------------------------*/
int CheckVoltage(void){
uint8_t low, high;
InitADC12(); // make ADC12 input, disable pull up
ADCSRB = 0x08; // make ADC on PK4, ADC12
ADMUX = 0x44;
// start the conversion
sbi(ADCSRA, ADSC);
// ADSC is cleared when the conversion finishes
while (bit_is_set(ADCSRA, ADSC));
// we have to read ADCL first; doing so locks both ADCL
// and ADCH until ADCH is read. reading ADCL second would
// cause the results of each conversion to be discarded,
// as ADCL and ADCH would be locked when it completed.
low = ADCL;
high = ADCH;
//combine the two bytes
return (high << 8) | low;
}
