uint16_t analogRead(uint8_t pin)
{
uint16_t channel,val;
uint16_t pinNum = digitalPinToPinNum(pin);
switch(pinNum) {
case PIN_57: {channel = ADC_CH_0;}break;
case PIN_58: {channel = ADC_CH_1;}break;
case PIN_59: {channel = ADC_CH_2;}break;
case PIN_60: {channel = ADC_CH_3;}break;
default: return 0;
}
while(ADCFIFOLvlGet(ADC_BASE, channel)) { // flush the channel's FIFO if not empty
ADCFIFORead(ADC_BASE, channel);
}
PinTypeADC(pinNum,0xFF);
ADCChannelEnable(ADC_BASE, channel);
ADCTimerConfig(ADC_BASE,2^17);
ADCTimerEnable(ADC_BASE);
ADCEnable(ADC_BASE);
while(!ADCFIFOLvlGet(ADC_BASE, channel));
val = ADCFIFORead(ADC_BASE, channel) & 0x3FFF;
ADCDisable(ADC_BASE);
ADCChannelDisable(ADC_BASE, channel);
ADCTimerDisable(ADC_BASE);
val = val >> 2;
return val;
}
/* ===================================================================*/
void ADCInit(void)
{
ADCEnable(); /* Clear ~CS, select ADC */
DelaySomeMs(1);
ADCUseInternalClock(); /* Set CLKSEL, ADC uses internal clock */
DelaySomeMs(1);
ADCStopConvertByHardware(); /* Clear START, ADC does not convert */
DelaySomeMs(1);
ADCPowerUp(); /* Set ~PWDN */
DelaySomeMs(1);
// ADCDirectConnect(); /* Use direct connect mode */
ADCResetByHardware(); /* Reset ADC when power on */
DelaySomeMs(1);
ADCConfigure(); /* Configure the register of ADC. */
}
void initialize( void )
{
CPU_PRESCALE(0);
USART_Init(BAUD_RATE);
USART_Transmit('\f'); // Send form feed to clear the terminal.
USART_SendString("WunderBoard initializing...\r\n");
USART_SendString("\tSetting ADC prescaler and disabling free running mode...\r\n");
SetupADC(ADC_PRESCALER_32, FALSE);
USART_SendString("\tEnabling ADC...\r\n");
ADCEnable();
USART_SendString("\tSetting ADC reference to Vcc...\r\n");
ADCSetReference(ADC_REF_VCC);
// Configure IO //
USART_SendString("\tConfiguring IO...\r\n");
//DDRx corresponds to PORTx/PINx, dependng on direction of data flow -- PORT for output, PIN for input
DDRA = 0x00; // Buttons and switches
DDRB = 0xE7; // Red enable, green enable and audio out
DDRC = 0xff; // Discrete LEDs
DDRE = 0x47; // LED Column
DDRF = 0x00; // Accelerometer
// Disable pullups and set outputs low //
PORTA = 0x00;
PORTB = 0x01;
PORTC = 0x81;
PORTE = 0x00;
PORTF = 0x00;
//Set OC1A to toggle
TCCR1A = 0b01000000;
// Clk/64 and CTC mode
TCCR1B = 0b00001011;
OCR1A = 24;
USART_SendString("\tSetting SPI\r\n");
//Set the SPI bus appropriately to use the LED array
SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0);
}
