/* Reads the differential analog value of two pins (pinP - pinN)
* It waits until the value is read and then returns the result
* If a comparison has been set up and fails, it will return ADC_ERROR_DIFF_VALUE
* Set the resolution, number of averages and voltage reference using the appropriate functions
*/
int ADC_Module::analogReadDifferential(uint8_t pinP, uint8_t pinN)
{
int32_t result;
if( ((pinP != A10) && (pinP != A12)) || ((pinN != A11) && (pinN != A13)) ) {
fail_flag |= ADC_ERROR_WRONG_PIN;
return ADC_ERROR_DIFF_VALUE; // all others are invalid
}
// increase the counter of measurements
num_measurements++;
// check for calibration before setting channels,
// because conversion will start as soon as we write to *ADC_SC1A
if (calibrating) wait_for_cal();
uint8_t res = getResolution();
// vars to saved the current state of the ADC in case it's in use
ADC_Config old_config = {0};
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();
//digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN) );
old_config.savedSC1A = *ADC_SC1A;
old_config.savedCFG1 = *ADC_CFG1;
old_config.savedCFG2 = *ADC_CFG2;
old_config.savedSC2 = *ADC_SC2;
old_config.savedSC3 = *ADC_SC3;
__enable_irq();
}
// no continuous mode
*ADC_SC3_adco = 0;
// once *ADC_SC1A is set, conversion will start, enable interrupts if requested
if ( (pinP == A10) && (pinN == A11) ) { // pins 34 and 35
__disable_irq();
#if defined(__MK20DX256__)
if ( *ADC_PGA & ADC_PGA_PGAEN ) { // PGA is enabled
if(ADC_num == 0) { // PGA0 connects to A10-A11
*ADC_SC1A = ADC_SC1_DIFF + 0x2 + var_enableInterrupts*ADC_SC1_AIEN;
__enable_irq();
} else { // If this is ADC1 we can't connect to PGA0
__enable_irq();
fail_flag |= ADC_ERROR_WRONG_ADC;
num_measurements--;
return ADC_ERROR_DIFF_VALUE;
}
} else { // no pga
if(ADC_num == 0) {
*ADC_SC1A = ADC_SC1_DIFF + 0x0 + var_enableInterrupts*ADC_SC1_AIEN; // In ADC0, A10-A11 is DAD0
__enable_irq();
} else if(ADC_num == 1) {
*ADC_SC1A = ADC_SC1_DIFF + 0x3 + var_enableInterrupts*ADC_SC1_AIEN; // In ADC1, A10-A11 is DAD3
__enable_irq()
}
}
/* Starts continuous and differential conversion between the pins (pinP-pinN)
* It returns as soon as the ADC is set, use analogReadContinuous() to read the value
* Set the resolution, number of averages and voltage reference using the appropriate functions BEFORE calling this function
*/
bool ADC_Module::startContinuousDifferential(uint8_t pinP, uint8_t pinN) {
if(!checkDifferentialPins(pinP, pinN)) {
fail_flag |= ADC_ERROR_WRONG_PIN;
return false; // all others are invalid
}
// increase the counter of measurements
num_measurements++;
// check for calibration before setting channels,
// because conversion will start as soon as we write to *ADC_SC1A
if (calibrating) wait_for_cal();
// save the current state of the ADC in case it's in use
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();
saveConfig(&adc_config);
__enable_irq();
}
// set continuous mode
continuousMode();
// start conversions
startDifferentialFast(pinP, pinN);
return true;
}
/* Starts an analog measurement on the pin.
* It returns inmediately, read value with readSingle().
* If the pin is incorrect it returns ADC_ERROR_VALUE.
*/
bool ADC_Module::startSingleRead(uint8_t pin) {
// check whether the pin is correct
if(!checkPin(pin)) {
fail_flag |= ADC_ERROR_WRONG_PIN;
return false;
}
if (calibrating) wait_for_cal();
// save the current state of the ADC in case it's in use
adcWasInUse = isConverting(); // is the ADC running now?
if(adcWasInUse) { // this means we're interrupting a conversion
// save the current conversion config, the adc isr will restore the adc
__disable_irq();
saveConfig(&adc_config);
__enable_irq();
}
// no continuous mode
singleMode();
// start measurement
startReadFast(pin);
return true;
}
void VideoConverter::cancelConversion()
{
if (isConverting())
{
ffmpegProcess->kill();
ffmpegProcess->waitForFinished();
}
}
/* ======================================================================
Function: waitEndConversion
Purpose : wait for a temperature or RH conversion is done
Input :
Output : delay in ms the process took.
Comments: if return >= TH02_CONVERSION_TIME_OUT, time out occured
====================================================================== */
uint8_t TH02::waitEndConversion(void)
{
// okay this is basic approach not so accurate
// but avoid using long and millis()
uint8_t time_out = 0;
// loop until conversion done or duration >= time out
while (isConverting() && time_out <= TH02_CONVERSION_TIME_OUT )
{
++time_out;
delay(1);
}
// return approx time of conversion
return (time_out);
}
/* 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 ADC_ERROR_VALUE.
* Set the resolution, number of averages and voltage reference using the appropriate functions.
*/
int ADC_Module::analogRead(uint8_t pin)
{
int32_t result;
if ( (pin < 0) || (pin > 43) ) {
fail_flag |= ADC_ERROR_WRONG_PIN;
return ADC_ERROR_VALUE; // all others are invalid
}
// increase the counter of measurements
num_measurements++;
if (calibrating) wait_for_cal();
// check if we are interrupting a measurement, store setting if so.
// vars to save the current state of the ADC in case it's in use
ADC_Config old_config = {0};
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();
//digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN) );
old_config.savedSC1A = *ADC_SC1A;
old_config.savedCFG1 = *ADC_CFG1;
old_config.savedCFG2 = *ADC_CFG2;
old_config.savedSC2 = *ADC_SC2;
old_config.savedSC3 = *ADC_SC3;
__enable_irq();
}
#if defined(__MK20DX256__)
// ADC1 has A15=5a and A20=4a so we have to change the mux to read the "a" channels
if( (ADC_num==1) && ( (pin==26) || (pin==31) ) ) { // mux a
//*ADC_CFG2 &= ~ADC_CFG2_MUXSEL;
*ADC_CFG2_muxsel = 0;
} else { // mux b
//*ADC_CFG2 |= ADC_CFG2_MUXSEL;
*ADC_CFG2_muxsel = 1;
}
#endif
// no continuous mode
*ADC_SC3_adco = 0;
__disable_irq();
*ADC_SC1A = channel2sc1a[pin] + var_enableInterrupts*ADC_SC1_AIEN; // start conversion on pin and with interrupts enabled if requested
__enable_irq();
// wait for the ADC to finish
while(isConverting()) {
yield();
//digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN) );
}
// it's done, check if the comparison (if any) was true
__disable_irq(); // make sure nothing interrupts this part
if (isComplete()) { // conversion succeded
result = (uint16_t)*ADC_RA;
} else { // comparison was false
fail_flag |= ADC_ERROR_COMPARISON;
result = ADC_ERROR_VALUE;
}
__enable_irq();
// if we interrupted a conversion, set it again
if (wasADCInUse) {
//digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN) );
*ADC_CFG1 = old_config.savedCFG1;
*ADC_CFG2 = old_config.savedCFG2;
*ADC_SC2 = old_config.savedSC2;
*ADC_SC3 = old_config.savedSC3;
*ADC_SC1A = old_config.savedSC1A;
}
num_measurements--;
return result;
} // analogRead
bool VideoConverter::canStartConversion()
{
return !isConverting();
}
/* 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 ADC_ERROR_VALUE.
* Set the resolution, number of averages and voltage reference using the appropriate functions.
*/
int ADC_Module::analogRead(uint8_t pin) {
//digitalWriteFast(LED_BUILTIN, HIGH);
// check whether the pin is correct
if(!checkPin(pin)) {
fail_flag |= ADC_ERROR_WRONG_PIN;
return ADC_ERROR_VALUE;
}
// increase the counter of measurements
num_measurements++;
//digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN));
if (calibrating) wait_for_cal();
//digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN));
// check if we are interrupting a measurement, store setting if so.
// vars to save the current state of the ADC in case it's in use
ADC_Config old_config = {0};
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();
//digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN) );
saveConfig(&old_config);
__enable_irq();
}
// no continuous mode
singleMode();
startReadFast(pin); // start single read
// wait for the ADC to finish
while(isConverting()) {
yield();
}
// it's done, check if the comparison (if any) was true
int32_t result;
__disable_irq(); // make sure nothing interrupts this part
if (isComplete()) { // conversion succeded
result = (uint16_t)*ADC_RA;
} else { // comparison was false
fail_flag |= ADC_ERROR_COMPARISON;
result = ADC_ERROR_VALUE;
}
__enable_irq();
// if we interrupted a conversion, set it again
if (wasADCInUse) {
//digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN) );
__disable_irq();
loadConfig(&old_config);
__enable_irq();
}
num_measurements--;
return result;
} // analogRead
/* Reads the differential analog value of two pins (pinP - pinN)
* It waits until the value is read and then returns the result
* If a comparison has been set up and fails, it will return ADC_ERROR_DIFF_VALUE
* Set the resolution, number of averages and voltage reference using the appropriate functions
*/
int ADC_Module::analogReadDifferential(uint8_t pinP, uint8_t pinN) {
if(!checkDifferentialPins(pinP, pinN)) {
fail_flag |= ADC_ERROR_WRONG_PIN;
return ADC_ERROR_VALUE; // all others are invalid
}
// increase the counter of measurements
num_measurements++;
// check for calibration before setting channels,
// because conversion will start as soon as we write to *ADC_SC1A
if (calibrating) wait_for_cal();
uint8_t res = getResolution();
// vars to saved the current state of the ADC in case it's in use
ADC_Config old_config = {0};
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();
saveConfig(&old_config);
__enable_irq();
}
// no continuous mode
singleMode();
startDifferentialFast(pinP, pinN); // start conversion
// wait for the ADC to finish
while( isConverting() ) {
yield();
//digitalWriteFast(LED_BUILTIN, !digitalReadFast(LED_BUILTIN) );
}
// it's done, check if the comparison (if any) was true
int32_t result;
__disable_irq(); // make sure nothing interrupts this part
if (isComplete()) { // conversion succeded
result = (int16_t)(int32_t)(*ADC_RA); // cast to 32 bits
if(res==16) { // 16 bit differential is actually 15 bit + 1 bit sign
result *= 2; // multiply by 2 as if it were really 16 bits, so that getMaxValue gives a correct value.
}
} else { // comparison was false
result = ADC_ERROR_VALUE;
fail_flag |= ADC_ERROR_COMPARISON;
}
__enable_irq();
// if we interrupted a conversion, set it again
if (wasADCInUse) {
__disable_irq();
loadConfig(&old_config);
__enable_irq();
}
num_measurements--;
return result;
} // analogReadDifferential
/* 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