SX Variable::highest() const{
if(isDifferential()){
return der();
} else {
return var();
}
}
/* Reads the analog value of the pin.
* It waits until the value is read and then returns the result.
* If a comparison has been set up and fails, it will return -1.
* Set the resolution, number of averages and voltage reference using the appropriate functions.
*/
int ADC::analogRead(uint8_t pin)
{
uint16_t result;
if (pin >= 14 && pin <= 39) {
if (pin <= 23) {
pin -= 14; // 14-23 are A0-A9
} else if (pin >= 34) {
pin -= 24; // 34-37 are A10-A13, 38 is temp sensor, 39 is vref
}
} else {
return ADC_ERROR_VALUE; // all others are invalid
}
if (calibrating) wait_for_cal();
uint8_t res = getResolution();
uint8_t diffRes = 0; // is the new resolution different from the old one?
// vars to save the current state of the ADC in case it's in use
uint32_t savedSC1A, savedSC2, savedSC3, savedCFG1, savedCFG2, savedRes;
uint8_t wasADCInUse = isConverting(); // is the ADC running now?
if(wasADCInUse) { // this means we're interrupting a conversion
// save the current conversion config, we don't want any other interrupts messing up the configs
__disable_irq();
//GPIOC_PSOR = 1<<5;
savedRes = res;
savedSC1A = ADC0_SC1A;
savedCFG1 = ADC0_CFG1;
savedSC2 = ADC0_SC2;
savedSC3 = ADC0_SC3;
// change the comparison values if interrupting a 16 bits and diff mode
if(res==16 && isDifferential()) {
ADC0_CV1 /= 2;
ADC0_CV2 /= 2;
}
// disable continuous mode in case analogRead is interrupting a continuous mode
ADC0_SC3 &= !ADC_SC3_ADCO;
__enable_irq(); ////keep irq disabled until we start our conversion
}
// if the resolution is incorrect (i.e. 9, 11 or 13) silently correct it
if( (res==9) || (res==11) || (res==13) ) {
setResolution(res-1);
diffRes = 1; // resolution changed
}
__disable_irq();
ADC0_SC1A = channel2sc1a[pin] + var_enableInterrupts*ADC_SC1_AIEN; // start conversion on pin and with interrupts enabled if requested
__enable_irq();
while (1) {
__disable_irq();
if ((ADC0_SC1A & ADC_SC1_COCO)) { // conversion completed
result = ADC0_RA;
// if we interrupted a conversion, set it again
if (wasADCInUse) {
//GPIOC_PCOR = 1<<5;
// restore ADC config, and restart conversion
if(diffRes) setResolution(savedRes); // don't change res if isn't necessary
if(res==16 && ((savedSC1A & ADC_SC1_DIFF) >> 5) ) { // change back the comparison values if interrupting a 16 bits and diff mode
ADC0_CV1 *= 2;
ADC0_CV2 *= 2;
}
ADC0_CFG1 = savedCFG1;
ADC0_SC2 = savedSC2 & 0x7F; // restore first 8 bits
ADC0_SC3 = savedSC3 & 0xF; // restore first 4 bits
ADC0_SC1A = savedSC1A & 0x7F; // restore first 8 bits
}
__enable_irq();
return result;
} else if( ((ADC0_SC2 & ADC_SC2_ADACT) == 0) && ((ADC0_SC1A & ADC_SC1_COCO) == 0) ) { // comparison was false
