uint32_t analogRead(uint32_t pin)
{
uint32_t val = 0;
/* allow for channel or pin numbers */
if (pin < 6) pin += A0;
PinDescription *p = &g_APinDescription[pin];
/* Disable pull-up and set pin mux for ADC output */
SET_PIN_MODE(p->ulSocPin, ADC_MUX_MODE);
SET_PIN_PULLUP(p->ulSocPin,0);
/* Reset sequence pointer */
SET_ARC_MASK(ADC_CTRL, ADC_SEQ_PTR_RST);
/* Update sequence table */
WRITE_ARC_REG(p->ulAdcChan, ADC_SEQ);
/* Reset sequence pointer & start sequencer */
SET_ARC_MASK(ADC_CTRL, ADC_SEQ_PTR_RST | ADC_SEQ_START | ADC_ENABLE);
/* Poll for ADC data ready status (DATA_A) */
while((READ_ARC_REG(ADC_INTSTAT) & ADC_INT_DATA_A) == 0);
/* Pop the data sample from FIFO to sample register */
SET_ARC_MASK(ADC_SET, ADC_POP_SAMPLE);
/* Read sample from sample register */
val = READ_ARC_REG( ADC_SAMPLE);
/* Clear the DATA_A status bit */
SET_ARC_MASK( ADC_CTRL, ADC_CLR_DATA_A);
return mapResolution(val, ADC_RESOLUTION, _readResolution);
}
void variantAdcInit(void)
{
uint32_t creg;
uint32_t saved;
/* read creg slave to get current Power Mode */
creg = READ_ARC_REG(AR_IO_CREG_SLV0_OBSR);
/* perform power up to "Normal mode w/o calibration" cycle if not already there */
if( (creg & ADC_MODE_MASK) != ADC_NORMAL_WO_CALIB){
/* Protect AR_IO_CREG_MST0_CTRL using lock and unlock of interruptions */
saved = interrupt_lock();
/* Read current CREG master */
creg = READ_ARC_REG(AR_IO_CREG_MST0_CTRL);
creg &= ~(ADC_MODE_MASK);
/* request ADC to go to Standby mode */
creg |= ADC_STANDBY | ADC_CLOCK_GATE;
WRITE_ARC_REG(creg, AR_IO_CREG_MST0_CTRL);
interrupt_unlock(saved);
/* Poll CREG Slave 0 for Power Mode status = requested status */
while ( (creg = READ_ARC_REG(AR_IO_CREG_SLV0_OBSR) & 0x8) == 0);
/* Protect AR_IO_CREG_MST0_CTRL using lock and unlock of interruptions */
saved = interrupt_lock();
creg = READ_ARC_REG(AR_IO_CREG_MST0_CTRL);
creg &= ~(ADC_MODE_MASK);
/* request ADC to go to Normal mode w/o calibration */
creg |= ADC_NORMAL_WO_CALIB | ADC_CLOCK_GATE;
WRITE_ARC_REG(creg, AR_IO_CREG_MST0_CTRL);
interrupt_unlock(saved);
/* Poll CREG Slave 0 for Power Mode status = requested status */
while ( ((creg = READ_ARC_REG(AR_IO_CREG_SLV0_OBSR)) & 0x8) == 0);
}
WRITE_ARC_REG(ADC_CLK_ENABLE | ADC_INT_DSB, ADC_CTRL);
WRITE_ARC_REG(ADC_CONFIG_SETUP, ADC_SET);
WRITE_ARC_REG(ADC_CLOCK_RATIO & ADC_CLK_RATIO_MASK, ADC_DIVSEQSTAT);
}
int digitalRead( uint8_t pin )
{
if (pin >= NUM_DIGITAL_PINS) return LOW;
PinDescription *p = &g_APinDescription[pin];
if (p->ulGPIOType == SS_GPIO)
{
uint32_t reg = p->ulGPIOBase + SS_GPIO_EXT_PORTA;
if (READ_ARC_REG(reg) & (1 << p->ulGPIOId)) return HIGH;
}
else if (p->ulGPIOType == SOC_GPIO)
{
uint32_t reg = p->ulGPIOBase + SOC_GPIO_EXT_PORTA;
if (MMIO_REG_VAL(reg) & (1 << p->ulGPIOId)) return HIGH;
}
return LOW;
}
