int read_a2d ( char channel ) // Read specified channel
{
ADCON0 = (ADCON0 & 0b11000011) | ((channel << 2) & 0b00111100);
ADCON0bits.GO = 1; // Start conversion
while ( adc_busy() == 1 ); // While conversion is not finished
return adc_read(); // Return 10 bit value
}
/*
* Do an analog to digital conversion.
* use this when you want to be notified as soon as the conversion is done.
* The process will be polled when conversion is done.
*/
void
adc_get_poll(uint8_t adc_ch, uint16_t *buf, struct process *p)
{
if(buf == NULL) {
/* unnecessary to run the ADC as the result will be dropped. */
return;
}
state = POLL;
calling_process = p;
dest = buf;
/* wait for already running ADC to finish */
while (adc_busy()) {;}
/* set up ports and pins */
if(adc_ch <= A7) {
/* all analog in are on port 1 on 2553 */
init_pininput(1 << adc_ch);
}
ADC10CTL1 |= adc_ch << 12;
/* set up, start ADC */
ADC10CTL0 |= ADC10IE;
ADC10CTL0 |= ADC10SC | ENC;
}
unsigned int io_read_analog(unsigned char port)
{
unsigned int result;
unsigned char channel;
#ifndef SDCC
static unsigned char inputs[] = {
ADC_CH0, ADC_CH1, ADC_CH2, ADC_CH3,
ADC_CH4, ADC_CH5, ADC_CH6, ADC_CH7,
ADC_CH8, ADC_CH9, ADC_CH10, ADC_CH11,
ADC_CH12, ADC_CH13, ADC_CH14, ADC_CH15 };
#endif
/* Make sure port does not exceed current Analog_ports */
if ( ! VALID_ANALOG_PORT(port) )
return OV_BAD_PARAM;
#ifdef SDCC
result = 0;
channel = port - 1;
/*
* SDCC generic adc_open() doesn't work for the 8520. Lots of
* stuff missing.
*/
adc_open8520(channel);
/* Allow settling time before starting a conversion */
delay10tcy(10);
adc_conv();
while ( adc_busy() )
;
result = adc_read();
adc_close();
#else /* MCC18 */
channel = inputs[port - 1];
OpenADC(ADC_FOSC_RC & ADC_RIGHT_JUST & Analog_ports_const,
channel & ADC_INT_OFF & ADC_VREFPLUS_VDD & ADC_VREFMINUS_VSS);
Delay10TCYx(10);
ConvertADC();
while (BusyADC())
;
ReadADC();
CloseADC();
result = (unsigned int)ADRESH << 8 | ADRESL;
#endif
return result;
}
/*
* Do an analog to digital conversion.
* use this when you need the result as soon as it is done; it will block until
* it is finished with the conversion (ca 50 us)
*/
uint16_t
adc_get(uint8_t adc_ch)
{
/* wait for already running ADC to finish */
while (adc_busy()) {;}
state = SYNCH;
/* set up ports and pins */
if(adc_ch <= A7) {
/* all analog in are on port 1 on 2553 */
init_pininput(1 << adc_ch);
}
ADC10CTL1 |= adc_ch << 12;
/* set up, start ADC */
ADC10CTL0 |= ADC10SC | ENC;
/* wait for ADC to finish, return result */
while (adc_busy()) {;}
state = OFF;
return ADC10MEM;
}
uint16_t analog_get(index_t index)
{
if (IX_ANALOG(1) <= index && index <= IX_ANALOG(USER_CT_ANALOG) && NUM_ANALOG_VALID(USER_CT_ANALOG)) {
/* Read ADC (0b10000111 = 0x87). */
uint8_t chan = 0x87 | (IX_ANALOG_INV(index) << 3);
adc_setchannel(chan);
delay10tcy(5); /* Wait for capacitor to charge */
adc_conv();
while(adc_busy());
return adc_read();
} else {
WARN_IX(index);
return 0;
}
}
/*
* Do an analog to digital conversion.
* use this when you want to be notified as soon as the conversion is done.
* The process p will be sent an event when conversion is done.
* adc_get_event(A7, PROCESS_CURRENT());
* PROCESS_WAIT_EVENT_UNTIL(ev == adc_event);
*
*/
void
adc_get_event(uint8_t adc_ch, struct process *p)
{
/* wait for already running ADC to finish */
while (adc_busy()) {;}
state = EVENT;
calling_process = p;
/* set up ports and pins */
if(adc_ch <= A7) {
/* all analog in are on port 1 on 2553 */
init_pininput(1 << adc_ch);
}
ADC10CTL1 |= adc_ch << 12;
/* set up, start ADC */
ADC10CTL0 |= ADC10IE;
ADC10CTL0 |= ADC10SC | ENC;
}
/*
* Do an analog to digital conversion.
* use this when you plan on using the conversion a bit later (>50 us later)
* and it is not that important. Will not block while converting.
* val will contain the result when done.
*/
void
adc_get_noblock(uint8_t adc_ch, uint16_t *val)
{
if(val == NULL) {
/* unnecessary to run the ADC as the result will be dropped. */
return;
}
dest = val;
/* wait for already running ADC to finish */
while (adc_busy()) {;}
state = ASYNCH;
/* set up ports and pins */
if(adc_ch <= A7) {
init_pininput(1 << adc_ch);
}
ADC10CTL1 |= adc_ch << 12;
/* this needs irq */
ADC10CTL0 |= ADC10IE;
ADC10CTL0 |= ADC10SC | ENC;
}
