void ADCInit(void)
{
ATDCTL2 = 0xE0;
wait20us();
ATDCTL3 = 0x0A; // Seq length = 1, finish current conversion before freeze
ATDCTL4 = 0x80; // 8-bit, Sample time = 2 cycles, Prescaler = /2
}
void ADCinit(void) {
ATDCTL2 = 0xE0;
wait20us();
ATDCTL3 = 0x22;
ATDCTL4 = 0x80;
}
void Calibrate_UR(void)
{
// get reference voltage, calibrate VCC with external 2.5V and
// get the port output resistance
#ifdef AUTO_CAL
uint16_t sum_rm; // sum of 3 Pin voltages with 680 Ohm load
uint16_t sum_rp; // sum of 3 Pin voltages with 680 Ohm load
uint16_t u680; // 3 * (Voltage at 680 Ohm)
#endif
ADCconfig.U_AVCC = U_VCC; // set initial VCC Voltage
ADCconfig.Samples = R_ANZ_MESS; // set number of ADC reads near to maximum
//############################################
#if FLASHEND > 0x1fff
uint16_t mv2500;
ADC_PORT = TXD_VAL; // switch to 0V
ADC_DDR = (1<<TPREF) | TXD_MSK; // switch pin with 2.5V reference to GND
wait20us(); // switch only short time, so that the relais do not really switch
ADC_DDR = TXD_MSK; // switch pin with reference back to input
mv2500 = W5msReadADC(TPREF); // read voltage of 2.5V precision reference
if ((mv2500 > 2250) && (mv2500 < 2750)) {
// precision voltage reference connected, update U_AVCC
WithReference = 1;
ADCconfig.U_AVCC = (unsigned long)((unsigned long)ADCconfig.U_AVCC * 2495) / mv2500;
}
#endif
#ifdef WITH_AUTO_REF
(void) ReadADC(MUX_INT_REF); // read reference voltage
ref_mv = W5msReadADC(MUX_INT_REF); // read reference voltage
#else
ref_mv = DEFAULT_BAND_GAP; // set to default Reference Voltage
#endif
RefVoltage(); //compute RHmultip = f(reference voltage)
//############################################
#ifdef AUTO_CAL
// measurement of internal resistance of the ADC port outputs switched to GND
ADC_DDR = 1<<TP1 | TXD_MSK; //ADC-Pin 1 to output 0V
R_PORT = 1<<PIN_RL1; //R_L-PORT 1 to VCC
R_DDR = 1<<PIN_RL1; //Pin 1 to output and over R_L to VCC
sum_rm = W5msReadADC(TP1);
ADC_DDR = 1<<TP2 | TXD_MSK; //ADC-Pin 2 to output 0V
R_PORT = 1<<PIN_RL2; //R_L-PORT 2 to VCC
R_DDR = 1<<PIN_RL2; //Pin 2 to output and over R_L to VCC
sum_rm += W5msReadADC(TP2);
ADC_DDR = 1<<TP3 | TXD_MSK; //ADC-Pin 3 to output 0V
R_PORT = 1<<PIN_RL3; //R_L-PORT 3 to VCC
R_DDR = 1<<PIN_RL3; //Pin 3 to output and over R_L to VCC
sum_rm += W5msReadADC(TP3); //add all three values
// measurement of internal resistance of the ADC port output switched to VCC
R_PORT = 0; // R-Ports to GND
ADC_PORT = 1<<TP1 | TXD_VAL; //ADC-Port 1 to VCC
ADC_DDR = 1<<TP1 | TXD_MSK; //ADC-Pin 1 to output 0V
R_DDR = 1<<PIN_RL1; //Pin 1 to output and over R_L to GND
sum_rp = ADCconfig.U_AVCC - W5msReadADC(TP1);
ADC_PORT = 1<<TP2 | TXD_VAL; //ADC-Port 2 to VCC
ADC_DDR = 1<<TP2 | TXD_MSK; //ADC-Pin 2 to output 0V
R_DDR = 1<<PIN_RL2; //Pin 2 to output and over R_L to GND
sum_rp += ADCconfig.U_AVCC - W5msReadADC(TP2);
ADC_PORT = 1<<TP3 | TXD_VAL; //ADC-Port 3 to VCC
ADC_DDR = 1<<TP3 | TXD_MSK; //ADC-Pin 3 to output 0V
R_DDR = 1<<PIN_RL3; //Pin 3 to output and over R_L to GND
sum_rp += ADCconfig.U_AVCC - W5msReadADC(TP3);
u680 = ((ADCconfig.U_AVCC * 3) - sum_rm - sum_rp); //three times the voltage at the 680 Ohm
pin_rmi = (unsigned long)((unsigned long)sum_rm * (unsigned long)R_L_VAL) / (unsigned long)u680;
// adcmv[2] = pin_rm; // for last output in row 2
pin_rpl = (unsigned long)((unsigned long)sum_rp * (unsigned long)R_L_VAL) / (unsigned long)u680;
resis680pl = pin_rpl + R_L_VAL;
resis680mi = pin_rmi + R_L_VAL;
#endif
ADCconfig.Samples = ANZ_MESS; // set to configured number of ADC samples
}
