unsigned char adc_read(unsigned char channel, float *value)
{
unsigned long xdata d, start_time;
unsigned char xdata i;
/* start conversion */
channel = adc_index[channel % (N_HV_CHN*2)];
write_adc(REG_CONTROL, channel << 4 | 0x0F); // adc_chn, +2.56V range
write_adc(REG_MODE, (1<<4) | (1<<1)); // single conversion, 10 channel mode
start_time = time();
while (ADC_NRDY) {
yield();
for (i=0 ; i<N_HV_CHN ; i++)
ramp_hv(i); // do ramping while reading ADC
/* abort if no ADC ready after 300ms */
if (time() - start_time > 30) {
reset_adc();
return 0;
}
}
read_adc24(REG_ADCDATA, &d);
/* convert to volts */
*value = ((float)d / (1l<<24)) * 2.56;
/* round result to 6 digits */
*value = floor(*value*1E6+0.5)/1E6;
return 1;
}
void adc_read()
{
unsigned char i;
unsigned long value;
float gvalue;
if (ADC_NRDY)
return;
read_adc24(REG_ADCDATA, &value);
/* convert to volts */
gvalue = ((float)value / (1l<<24)) * 2.56;
/* round result to 5 digits */
gvalue = floor(gvalue*1E5+0.5)/1E5;
/* apply range */
if (user_data.adc_25 == 0) {
if (user_data.uni_adc)
gvalue *= 10.0/2.56;
else
gvalue = gvalue/2.56*20.0 - 10;
}
DISABLE_INTERRUPTS;
user_data.adc[adc_chn] = gvalue;
ENABLE_INTERRUPTS;
/* start next conversion */
adc_chn = (adc_chn + 1) % 8;
i = adc_index[adc_chn];
write_adc(REG_CONTROL, i << 4 | 0x0F); // adc_chn, +2.56V range
}
unsigned char adc_read(unsigned char channel, float *value)
{
unsigned long d, start_time;
unsigned char i;
/* start conversion */
channel = adc_index[channel % 8];
write_adc(REG_CONTROL, channel << 4 | 0x0F); // adc_chn, +2.56V range
write_adc(REG_MODE, 2); // single conversion
start_time = time();
while (ADC_NRDY) {
yield();
for (i=0 ; i<N_HV_CHN ; i++)
ramp_hv(i); // do ramping while reading ADC
/* abort if no ADC ready after 300ms */
if (time() - start_time > 30) {
/* reset ADC */
ADC_NRES = 0;
delay_ms(100);
ADC_NRES = 1;
delay_ms(300);
write_adc(REG_FILTER, ADC_SF_VALUE);
return 0;
}
}
read_adc24(REG_ADCDATA, &d);
/* convert to volts */
*value = ((float)d / (1l<<24)) * 2.56;
/* round result to 6 digits */
*value = floor(*value*1E6+0.5)/1E6;
return 1;
}
