/* Set lowest ADC to be start in sequence and highest to be interrupt
enabled and set end-of-sequence on the highest active ADC */
static void
sethilo(void)
{
int c;
/* Clear start of sequence */
ADC12CTL1 &= ~(CSTARTADD_15);
/* Set new start of sequence to lowest active memory holder */
for(c = 0; c < 8; c++) {
if(adcflags & (1 << c)) {
ADC12CTL1 |= (c * CSTARTADD_1);
break;
}
}
/* Clear all interrupts and end-of-sequences */
ADC12IE = 0;
for(c = 0; c < 8; c++) {
ADC12MCTL_NO(c) &= ~EOS;
}
/* Set highest interrupt and end-of-sequence. This will generate one
interrupt for each sequence of conversions. */
for(c = 0; c < 8; c++) {
if(adcflags & (128 >> c)) {
ADC12IE |= 128 >> c;
ADC12MCTL_NO(7 - c) |= EOS;
break;
}
}
}
/*---------------------------------------------------------------------------*/
void
irq_adc12_deactivate(const struct sensors_sensor *sensor, unsigned char adcno)
{
/* stop converting */
ADC12CTL0 &= ~ENC;
/* wait for conversion to stop */
while(ADC12CTL0 & ADC12BUSY);
ADC12CTL0 &= ~(ADC12ON | REFON);
ADC12IE = 0;
/* clear any pending interrupts */
ADC12IFG = 0;
adcflags &= ~(1 << adcno);
ADC12MCTL_NO(adcno) = 0;
sethilo();
sensors_remove_irq(sensor, IRQ_ADC);
if(adcflags) {
/* Turn on the ADC12 */
ADC12CTL0 |= (ADC12ON | REFON);
/* Delay */
clock_delay(20000);
/* Still active. Turn on the conversion. */
ADC12CTL0 |= ENC | ADC12SC;
}
}
/*---------------------------------------------------------------------------*/
void
irq_adc12_activate(const struct sensors_sensor *sensor,
unsigned char adcno, unsigned char config)
{
/* stop converting */
ADC12CTL0 &= ~ENC;
/* wait for conversion to stop */
while(ADC12CTL0 & ADC12BUSY);
ADC12CTL0 &= ~(ADC12ON | REFON);
ADC12IE = 0;
/* clear any pending interrupts */
ADC12IFG = 0;
adcflags |= (1 << adcno);
ADC12MCTL_NO(adcno) = config;
sethilo();
ADC12CTL0 |= ADC12ON | REFON;
sensors_add_irq(sensor, IRQ_ADC);
/* Delay */
clock_delay(20000);
ADC12CTL0 |= ENC | ADC12SC;
}
/*---------------------------------------------------------------------------*/
static CC_INLINE void
start(void)
{
uint16_t c, last;
/* Set up the ADC. */
P6DIR = 0xff;
P6OUT = 0x00;
/* Setup ADC12, ref., sampling time */
/* XXX Note according to the specification a minimum of 17 ms should
be allowed after turn on of the internal reference generator. */
ADC12CTL0 = REF2_5V + SHT0_6 + SHT1_6 + MSC + REFON;
/* Use sampling timer, repeat-sequence-of-channels */
ADC12CTL1 = SHP + CONSEQ_3;
last = 15;
for(c = 0; c < 16; c++) {
/* Clear all end-of-sequences */
ADC12MCTL_NO(c) &= ~EOS;
if(adc_on & (1 << c)) {
if(last == 15) {
/* Set new start of sequence to lowest active memory holder */
ADC12CTL1 |= (c * CSTARTADD_1);
}
last = c;
}
}
/* Set highest end-of-sequence. */
ADC12MCTL_NO(last) |= EOS;
ADC12CTL0 |= ADC12ON;
ADC12CTL0 |= ENC; /* enable conversion */
ADC12CTL0 |= ADC12SC; /* sample & convert */
}
/*---------------------------------------------------------------------------*/
int
adc_sensors_configure(uint16_t input, uint8_t ref, int type, int value)
{
uint16_t c;
if(type == SENSORS_ACTIVE) {
stop();
if(value) {
adc_on |= input;
P6SEL |= input & 0xff;
/* Set ADC config */
for(c = 0; c < 16; c++) {
if(input & (1 << c)) {
ADC12MCTL_NO(c) = (c * INCH_1) | ref;
}
}
} else {
adc_on &= ~input;
ready &= ~input;
P6SEL &= ~(input & 0xff);
}
if(adc_on == 0) {
P6DIR = 0x00;
P6SEL = 0x00;
/* Turn off ADC and internal reference generator */
ADC12CTL0 = 0;
ADC12CTL1 = 0;
} else {
start();
}
return 1;
}
return 0;
}
