void InitADC( ADC_t *ADC_Pointer ) { // Initialize sweep for channel 0, 1, 2 and 3 ADC_SweepChannels_Config( ADC_Pointer, ADC_SWEEP_0123_gc ); // Setup event to start synchronized sweep ADC_Events_Config( ADC_Pointer, ADC_EVSEL_0123_gc, ADC_EVACT_SYNCHSWEEP_gc ); // Initialize the four channels to convert in single ended mode ADC_Ch_InputMode_and_Gain_Config( &ADC_Pointer->CH0, ADC_CH_INPUTMODE_SINGLEENDED_gc, ADC_CH_GAIN_1X_gc ); ADC_Ch_InputMode_and_Gain_Config( &ADC_Pointer->CH1, ADC_CH_INPUTMODE_SINGLEENDED_gc, ADC_CH_GAIN_1X_gc ); ADC_Ch_InputMode_and_Gain_Config( &ADC_Pointer->CH2, ADC_CH_INPUTMODE_SINGLEENDED_gc, ADC_CH_GAIN_1X_gc ); ADC_Ch_InputMode_and_Gain_Config( &ADC_Pointer->CH3, ADC_CH_INPUTMODE_SINGLEENDED_gc, ADC_CH_GAIN_1X_gc ); // Route the channels to different pins // Note that in Single Ended Mode, there is no negative input ADC_Ch_InputMux_Config( &ADC_Pointer->CH0, ADC_CH_MUXPOS_PIN1_gc, 0 ); ADC_Ch_InputMux_Config( &ADC_Pointer->CH1, ADC_CH_MUXPOS_PIN2_gc, 0 ); ADC_Ch_InputMux_Config( &ADC_Pointer->CH2, ADC_CH_MUXPOS_PIN3_gc, 0 ); ADC_Ch_InputMux_Config( &ADC_Pointer->CH3, ADC_CH_MUXPOS_PIN4_gc, 0 ); // Sample rate is CPUFREQ / 32. @ 2 MHz this equals 62,5ksps ADC_Prescaler_Config( ADC_Pointer, ADC_PRESCALER_DIV32_gc); // Set up ADCx to have unsigned conversion mode and 8 bit resolution ADC_ConvMode_and_Resolution_Config( ADC_Pointer, false, ADC_RESOLUTION_8BIT_gc ); // Set reference voltage on ADCx to be VCC/1.6 V ADC_Reference_Config( ADC_Pointer, ADC_REFSEL_VCC_gc ); // Enable the ADC ADC_Enable( ADC_Pointer ); // Wait until common mode voltage is stable. Default clk is 2MHz and // therefore within the maximum frequency to use this function. ADC_Wait_8MHz( ADC_Pointer ); }
int main(void) { // Add code to sweep CH0 and CH1 in free running mode // Use the function call in the adc_driver.h ADC_SweepChannels_Config( &ADCB, ADC_SWEEP_01_gc); //Enable internal temperature sensor, to be used by CH1 ADC_TempReference_Enable(&ADCB); // Setup CH1 to have single ended input as in task1 and task2 ADC_Ch_InputMode_and_Gain_Config(&ADCB.CH0, ADC_CH_INPUTMODE_SINGLEENDED_gc, ADC_CH_GAIN_1X_gc); // Set input to CH0 in ADC B to be PIN 1 ADC_Ch_InputMux_Config(&ADCB.CH0, ADC_CH_MUXPOS_PIN1_gc, 0); // Setup CH1 to read internal signal ADC_Ch_InputMode_and_Gain_Config(&ADCB.CH1, ADC_CH_INPUTMODE_INTERNAL_gc, ADC_CH_GAIN_1X_gc); // CH1 is set up to measure the internal temperature sensor ADC_Ch_InputMux_Config(&ADCB.CH1, ADC_CH_MUXINT_TEMP_gc, 0); // Set up ADC B to have unsigned conversion mode and 12 bit resolution ADC_ConvMode_and_Resolution_Config(&ADCB, false, ADC_RESOLUTION_12BIT_gc); // Set reference voltage on ADC B to be VCC/1.6 V ADC_Reference_Config(&ADCB, ADC_REFSEL_VCC_gc); // Sample rate is CPUFREQ/16. ADC_Prescaler_Config(&ADCB, ADC_PRESCALER_DIV16_gc); // Enable ADC B ADC_Enable(&ADCB); // Wait until common mode voltage is stable. Default clk is 2MHz and // therefore within the maximum frequency to use this function. ADC_Wait_8MHz(&ADCB); // Enable ADC B free running mode ADC_FreeRunning_Enable(&ADCB); // Set the LEDPORT as output LEDPORT.DIR = 0xFF; while(1) { // When CH1IF is set, both conversions are done since CH0 is started first // Wait for CH1IF to be set do { } while ((ADCB.INTFLAGS & ADC_CH1IF_bm) != ADC_CH1IF_bm); // Clear CH1 Interrupt Flag ADCB.INTFLAGS |= ADC_CH1IF_bm; // Read the CH0 result register, 12 bit unsigned (0-4095) ADC_result_CH0 = ADCB.CH0RES; // Read the CH1 result register ADC_result_CH1 = ADCB.CH1RES; // Shift CH0 result to get the 4 MSB of the input signal on the 4 LSB of the LEDs ADC_result_CH0 >>= 8; // Shift CH1 result to get the 4 MSB of the temperature on the 4 MSB of the LEDs // Also downscale it to 4 bit. Try touching the Xmega to warm it up. ADC_result_CH1 = ((ADC_result_CH1 - 1) / 16); ADC_result_CH1 <<= 4; // Output on the LEDs, the 4 MSB is the internal temperature reading, // and the 4 LSB is the single ended input reading, LEDPORT.OUT = ~( (ADC_result_CH1 & 0x00F0) | (ADC_result_CH0 & 0x000F)); } }
//----------------------------------------------------------------------------- // functions //----------------------------------------------------------------------------- void adc_init(void) { /* Note: port_init() must be run before this function, so that the inputs are set correctly. We are using both ADCs. So everything will be set up for ADCA && ADCB. */ // Load the production calibration data into each ADC. // This data was taken by Atmel and is stored in the micro. // This function takes care of the whole process for you. ADC_CalibrationValues_Load(&ADCA); ADC_CalibrationValues_Load(&ADCB); // Set the mode of operation for each ADC // Signed operation mode is required for the differential configuration. ADC_ConvMode_and_Resolution_Config(&ADCA,signed_y,ADC_RESOLUTION_12BIT_gc); ADC_ConvMode_and_Resolution_Config(&ADCB,signed_y,ADC_RESOLUTION_12BIT_gc); // Set ADC clocks // 32MHz / 128 = 250KHz // I currently have no explanation for this choice // Atmel documentation states that you need to stay within the recommended // ADC frequencies, but I cannot find the specific numbers. ADC_Prescaler_Config(&ADCA, ADC_PRESCALER_DIV128_gc); ADC_Prescaler_Config(&ADCB, ADC_PRESCALER_DIV128_gc); // Select reference to be external reference on PIN0 for A and B ADC_Reference_Config(&ADCA, ADC_REFSEL_AREFA_gc); ADC_Reference_Config(&ADCB, ADC_REFSEL_AREFB_gc); // Setup all channels to have differential input and 1X gain ADC_Ch_InputMode_and_Gain_Config(&ADCA.CH0,ADC_CH_INPUTMODE_DIFF_gc, ADC_CH_GAIN_1X_gc); // V1 ADC_Ch_InputMode_and_Gain_Config(&ADCA.CH1,ADC_CH_INPUTMODE_DIFF_gc, ADC_CH_GAIN_1X_gc); // V2 ADC_Ch_InputMode_and_Gain_Config(&ADCA.CH2,ADC_CH_INPUTMODE_DIFF_gc, ADC_CH_GAIN_1X_gc); // reference ADC_Ch_InputMode_and_Gain_Config(&ADCB.CH0,ADC_CH_INPUTMODE_DIFF_gc, ADC_CH_GAIN_1X_gc); // I1 ADC_Ch_InputMode_and_Gain_Config(&ADCB.CH1,ADC_CH_INPUTMODE_DIFF_gc, ADC_CH_GAIN_1X_gc); // I2 ADC_Ch_InputMode_and_Gain_Config(&ADCB.CH2,ADC_CH_INPUTMODE_DIFF_gc, ADC_CH_GAIN_1X_gc); // reference // Select the input pins for each ADC. /* See AnodV2.1.sch eagle file: V1 - A1 V2 - A2 I1 - B1 I2 - B2 Ref - A0,A3,B0,B3 */ ADC_Ch_InputMux_Config(&ADCA.CH0, ADC_CH_MUXPOS_PIN1_gc, \ ADC_CH_MUXNEG_PIN3_gc); // V1 ADC_Ch_InputMux_Config(&ADCA.CH1, ADC_CH_MUXPOS_PIN2_gc, \ ADC_CH_MUXNEG_PIN3_gc); // V2 ADC_Ch_InputMux_Config(&ADCA.CH2, ADC_CH_MUXPOS_PIN3_gc, \ ADC_CH_MUXNEG_PIN3_gc); // Offset calib ADC_Ch_InputMux_Config(&ADCB.CH0, ADC_CH_MUXPOS_PIN1_gc, \ ADC_CH_MUXNEG_PIN3_gc); // V1 ADC_Ch_InputMux_Config(&ADCB.CH1, ADC_CH_MUXPOS_PIN2_gc, ADC_CH_MUXNEG_PIN3_gc); // V2 ADC_Ch_InputMux_Config(&ADCB.CH2, ADC_CH_MUXPOS_PIN3_gc, ADC_CH_MUXNEG_PIN3_gc); // Offset calib // Configure the ADCA.CH2 interrupt. // This will trip once a reading on channel 2 has been completely resolved. // I am assuming the chan 0 and 1 of both ADCs will have their results completed // when chan 2 is done. This is based from the Xmega A manual (sect 25) ADC_Ch_Interrupts_Config(&ADCA.CH1, ADC_CH_INTMODE_COMPLETE_gc, \ ADC_CH_INTLVL_LO_gc); //Enable ADCs ADC_Enable(&ADCA); ADC_Enable(&ADCB); // Wait until common mode voltage is stable so tha bypass transients are not passed. // What is the difference between the 32 and 8 MHz versions, // and which one do I want? ADC_Wait_32MHz(&ADCA); ADC_Wait_32MHz(&ADCB); // The TCD0 timer will periodically trigger an event that will create an event // on channel 0. (Xmega A manual sect 6) eflags.setEventSource = EVSYS_SetEventSource(0, EVSYS_CHMUX_TCD0_OVF_gc); TC0_ConfigClockSource(&TCD0, TC_CLKSEL_DIV8_gc); TCD0.PER = 200; // 1/f = 1/(32MHz/DIVx/PER) --- 200---50us---20KHz // This is moved to the adc_test() fun. May want to enable it here later. // enable timer overflow int and set priority to low. //TCD0.INTCTRLA = TC_OVFINTLVL_LO_gc; // An event on eventChan 0 will trigger a sweep of chan 0,1 in ADCA && ADCB. // I do not know what would happen if an event happened on eventChan 1,2,3. ADC_Events_Config(&ADCA, ADC_EVSEL_0123_gc, ADC_EVACT_SWEEP_gc); ADC_Events_Config(&ADCB, ADC_EVSEL_0123_gc, ADC_EVACT_SWEEP_gc); ADC_SweepChannels_Config(&ADCA, ADC_SWEEP_01_gc); ADC_SweepChannels_Config(&ADCB, ADC_SWEEP_01_gc); // Calibration routine for the ADCs // Find offset with two pins shorted together. // Steve also found the offset for the current with 0 current flowing into them, // but did not do an equivalent for voltage. I will leave this out for now. offset_A = ADC_Offset_Get_Signed(&ADCA, &(ADCA.CH2), true); offset_B = ADC_Offset_Get_Signed(&ADCB, &(ADCB.CH2), true); }