void pot_init(void) {
//sets up interrupts to trigger on every sucessful conversion
IRQ_ConfigureIT(AT91C_ID_ADC, 0, ISR_ADC);
//initilize ADC
ADC_Initialize(AT91C_BASE_ADC,
AT91C_ID_ADC,
AT91C_ADC_TRGEN_DIS,
0,
AT91C_ADC_SLEEP_NORMAL_MODE,
AT91C_ADC_LOWRES_10_BIT,
BOARD_MCK,
BOARD_ADC_FREQ,
10,
1200);
ADC_EnableDataReadyIt(AT91C_BASE_ADC);
ADC_EnableChannel(AT91C_BASE_ADC, POT_CHANNEL);
IRQ_EnableIT(AT91C_ID_ADC);
ADC_EnableIt(AT91C_BASE_ADC, POT_CHANNEL);
//Starts the adc
ADC_StartConversion(AT91C_BASE_ADC);
}
void SensorsInit()
{
char pinDirection = 0;
int i;
PIO_Configure(analogs, PIO_LISTSIZE(analogs));
PIO_Configure(digitalIns, PIO_LISTSIZE(digitalIns));
PIO_Configure(sensorsPower, PIO_LISTSIZE(sensorsPower));
PMC_EnablePeripheral(AT91C_ID_PIOB);
PMC_EnablePeripheral(AT91C_ID_PIOA);
PMC_EnablePeripheral(AT91C_ID_ADC1);
ADC_Initialize(AT91C_BASE_ADC1, AT91C_ID_ADC1, AT91C_ADC_TRGEN_DIS, \
0, AT91C_ADC_SLEEP_NORMAL_MODE, AT91C_ADC_LOWRES_10_BIT, \
MCK, BOARD_ADC_FREQ, 10, 3000);
for(i = 0;i < 8;i++) ADC_EnableChannel(AT91C_BASE_ADC1, i);
SetPitCallback(SensorsCallback,1);
SelectAng0(); // select analog port 0 to be mesured instead of BattVoltage
SensorPowerOn(); // turn on the Vcc line
if(PMC_IsPeriphEnabled(AT91C_ID_TWI) == 0){
PIO_Configure(twiPortPins, PIO_LISTSIZE(twiPortPins));
PMC_EnablePeripheral(AT91C_ID_TWI);
TWI_ConfigureMaster(AT91C_BASE_TWI,TWCK,MCK);
}
// set all pins on pullup chip to output
WritePullupData(0x00,&pinDirection,1);
WritePullupData(0x01,&pinDirection,1);
for(i = 0;i < 8;i++){
if(i>1) AnalogPullup(i,1); // enable pullups if needed
DigitalPullup(i,1); // enable all digital pullups
}
}
/*---------------------------------------------------------------------------*/
void Potentiometer_Init(void)
{
ADC_Start();
ADC_EnableChannel(POTENTIOMETER_CHANNEL);
}
static uint32_t _WFE_Potentiometer_Initialize( void )
{
Adc *pAdc = ADC;
int32_t dwLowPotThreshold, dwHighPotThreshold;
/* STEP1: Realize a first measure to get potentiometer's initial position */
/* Initialize ADC*/
ADC_Initialize( pAdc,ID_ADC, ADC_MR_TRGEN_DIS,/*HARDWARE trigger*/
0,ADC_MR_SLEEP_NORMAL,ADC_MR_LOWRES_12_BIT,
BOARD_MCK,BOARD_ADC_FREQ,10,20);
/*Enable channel 5 (potentiometer) */
ADC_EnableChannel(pAdc, ADC_CHANNEL_5);
/* Start convrsion */
ADC_StartConversion(pAdc);
/* Wait for the end of conversion */
while ( !(ADC_GetStatus(pAdc) & ADC_ISR_EOC5) ) {}
/* Get the potentiometer initial value */
gdwPotentiometerValue = ADC_GetConvertedData(pAdc, ADC_CHANNEL_5);
/* Set Window threshold according to the initial values */
dwLowPotThreshold = gdwPotentiometerValue - (NB_INTERVALS * (0x1000 / 256));
if (dwLowPotThreshold < 0)
dwLowPotThreshold = 0;
dwHighPotThreshold = gdwPotentiometerValue + (NB_INTERVALS * (0x1000 / 256));
if (dwHighPotThreshold >= 0x1000)
dwHighPotThreshold = 0x1000 - 1;
/* Normalize the value 0 -> 255 */
gdwPotentiometerValue = (gdwPotentiometerValue * 256) / 0xFFF;
/* STEP2: Re configure ADC to use windowing */
/* Initialize ADC*/
ADC_Initialize( pAdc,ID_ADC, ADC_MR_TRGEN_EN,/*HARDWARE trigger*/
ADC_MR_TRGSEL_ADC_TRIG0,ADC_MR_SLEEP_NORMAL,ADC_MR_LOWRES_12_BIT,
BOARD_MCK,BOARD_ADC_FREQ,10,20);
/*Enable channel 5 (potentiometer) */
ADC_EnableChannel(pAdc, ADC_CHANNEL_5);
/* Configure TC*/
ConfigureTc0();
/*Channel 5 has to be compared*/
ADC_SetCompareChannel(pAdc, ADC_CHANNEL_5);
/*Compare mode, in the window*/
ADC_SetCompareMode(pAdc, ADC_EMR_CMPMODE_OUT);
/* Setup Threshold*/
ADC_SetComparisonWindow(pAdc,((dwHighPotThreshold<<16)|dwLowPotThreshold));
/* enable adc interrupt*/
NVIC_EnableIRQ(ADC_IRQn);
/* Enable Compare Interrupt*/
ADC_EnableIt(pAdc, ADC_IDR_COMPE);
/* Start TC0 and hardware trigger*/
TC_Start(TC0,0);
return SAMGUI_E_OK ;
}
