adc12_a_ex7_sequence.c

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//******************************************************************************
//******************************************************************************
 
#include "driverlib.h"
 
//Needs to be global in this example
//Otherwise, the compiler removes it
//because it is not used for anything.
volatile uint16_t results[4];
 
void main (void)
{
    //Stop Watchdog Timer
    WDT_A_hold(WDT_A_BASE);
 
    //Enable A/D channel inputs
    GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P6,
        GPIO_PIN0 + GPIO_PIN1 + GPIO_PIN2 +
        GPIO_PIN3 + GPIO_PIN4 + GPIO_PIN5 +
        GPIO_PIN6 + GPIO_PIN7
        );
 
    //Initialize the ADC12_A Module
    /*
     * Base address of ADC12_A Module
     * Use internal ADC12_A bit as sample/hold signal to start conversion
     * USE MODOSC 5MHZ Digital Oscillator as clock source
     * Use default clock divider of 1
     */
    ADC12_A_init(ADC12_A_BASE,
        ADC12_A_SAMPLEHOLDSOURCE_SC,
        ADC12_A_CLOCKSOURCE_ADC12OSC,
        ADC12_A_CLOCKDIVIDER_1);
 
    ADC12_A_enable(ADC12_A_BASE);
 
    /*
     * Base address of ADC12_A Module
     * For memory buffers 0-7 sample/hold for 16 clock cycles
     * For memory buffers 8-15 sample/hold for 4 clock cycles (default)
     * Enable Multiple Sampling
     */
    ADC12_A_setupSamplingTimer(ADC12_A_BASE,
        ADC12_A_CYCLEHOLD_16_CYCLES,
        ADC12_A_CYCLEHOLD_4_CYCLES,
        ADC12_A_MULTIPLESAMPLESENABLE);
 
    //Configure Memory Buffers
    /*
     * Base address of the ADC12_A Module
     * Configure memory buffer 0
     * Map input A0 to memory buffer 0
     * Vref+ = AVcc
     * Vref- = AVss
     * Memory buffer 0 is not the end of a sequence
     */
    ADC12_A_configureMemoryParam param0 = {0};
    param0.memoryBufferControlIndex = ADC12_A_MEMORY_0;
    param0.inputSourceSelect = ADC12_A_INPUT_A0;
    param0.positiveRefVoltageSourceSelect = ADC12_A_VREFPOS_AVCC;
    param0.negativeRefVoltageSourceSelect = ADC12_A_VREFNEG_AVSS;
    param0.endOfSequence = ADC12_A_NOTENDOFSEQUENCE;
    ADC12_A_configureMemory(ADC12_A_BASE ,&param0);
    
    /*
     * Base address of the ADC12_A Module
     * Configure memory buffer 1
     * Map input A1 to memory buffer 1
     * Vref+ = AVcc
     * Vref- = AVss
     * Memory buffer 1 is not the end of a sequence
     */
    ADC12_A_configureMemoryParam param1 = {0};
    param1.memoryBufferControlIndex = ADC12_A_MEMORY_1;
    param1.inputSourceSelect = ADC12_A_INPUT_A1;
    param1.positiveRefVoltageSourceSelect = ADC12_A_VREFPOS_AVCC;
    param1.negativeRefVoltageSourceSelect = ADC12_A_VREFNEG_AVSS;
    param1.endOfSequence = ADC12_A_NOTENDOFSEQUENCE;
    ADC12_A_configureMemory(ADC12_A_BASE ,&param1);
    
    /*
     * Base address of the ADC12_A Module
     * Configure memory buffer 2
     * Map input A2 to memory buffer 2
     * Vref+ = AVcc
     * Vref- = AVss
     * Memory buffer 2 is not the end of a sequence
     */
    ADC12_A_configureMemoryParam param2 = {0};
    param2.memoryBufferControlIndex = ADC12_A_MEMORY_2;
    param2.inputSourceSelect = ADC12_A_INPUT_A2;
    param2.positiveRefVoltageSourceSelect = ADC12_A_VREFPOS_AVCC;
    param2.negativeRefVoltageSourceSelect = ADC12_A_VREFNEG_AVSS;
    param2.endOfSequence = ADC12_A_NOTENDOFSEQUENCE;
    ADC12_A_configureMemory(ADC12_A_BASE ,&param2);
     
    /*
     * Base address of the ADC12_A Module
     * Configure memory buffer 3
     * Map input A3 to memory buffer 3
     * Vr+ = AVcc
     * Vr- = AVss
     * Memory buffer 3 IS the end of a sequence
     */
    ADC12_A_configureMemoryParam param3 = {0};
    param3.memoryBufferControlIndex = ADC12_A_MEMORY_3;
    param3.inputSourceSelect = ADC12_A_INPUT_A3;
    param3.positiveRefVoltageSourceSelect = ADC12_A_VREFPOS_AVCC;
    param3.negativeRefVoltageSourceSelect = ADC12_A_VREFNEG_AVSS;
    param3.endOfSequence = ADC12_A_ENDOFSEQUENCE;
    ADC12_A_configureMemory(ADC12_A_BASE ,&param3);
    
    //Enable memory buffer 3 interrupt
    ADC12_A_clearInterrupt(ADC12_A_BASE,
        ADC12IE3);
    ADC12_A_enableInterrupt(ADC12_A_BASE,
        ADC12IE3);
 
    while (1)
    {
        //Enable/Start first sampling and conversion cycle
        /*
         * Base address of ADC12_A Module
         * Start the conversion into memory buffer 0
         * Use the repeated sequence of channels
         */
        ADC12_A_startConversion(ADC12_A_BASE,
            ADC12_A_MEMORY_0,
            ADC12_A_SEQOFCHANNELS);
 
        //Enter LPM4, Enable interrupts
        __bis_SR_register(LPM4_bits + GIE);
        //For debugger
        __no_operation();
    }
}
 
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC12_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(ADC12_VECTOR)))
#endif
void ADC12ISR (void)
{
    switch (__even_in_range(ADC12IV,34)){
        case  0: break;   //Vector  0:  No interrupt
        case  2: break;   //Vector  2:  ADC overflow
        case  4: break;   //Vector  4:  ADC timing overflow
        case  6: break;   //Vector  6:  ADC12IFG0
        case  8: break;   //Vector  8:  ADC12IFG1
        case 10: break;   //Vector 10:  ADC12IFG2
        case 12:          //Vector 12:  ADC12IFG3
            //Move results, IFG is cleared
            results[0] =
                ADC12_A_getResults(ADC12_A_BASE,
                    ADC12_A_MEMORY_0);
            //Move results, IFG is cleared
            results[1] =
                ADC12_A_getResults(ADC12_A_BASE,
                    ADC12_A_MEMORY_1);
            //Move results, IFG is cleared
            results[2] =
                ADC12_A_getResults(ADC12_A_BASE,
                    ADC12_A_MEMORY_2);
            //Move results, IFG is cleared
            results[3] =
                ADC12_A_getResults(ADC12_A_BASE,
                    ADC12_A_MEMORY_3);
 
            //Exit active CPU, SET BREAKPOINT HERE
            __bic_SR_register_on_exit(LPM4_bits);
        case 14: break;   //Vector 14:  ADC12IFG4
        case 16: break;   //Vector 16:  ADC12IFG5
        case 18: break;   //Vector 18:  ADC12IFG6
        case 20: break;   //Vector 20:  ADC12IFG7
        case 22: break;   //Vector 22:  ADC12IFG8
        case 24: break;   //Vector 24:  ADC12IFG9
        case 26: break;   //Vector 26:  ADC12IFG10
        case 28: break;   //Vector 28:  ADC12IFG11
        case 30: break;   //Vector 30:  ADC12IFG12
        case 32: break;   //Vector 32:  ADC12IFG13
        case 34: break;   //Vector 34:  ADC12IFG14
        default: break;
    }
}