sd24_b_ex3_contConvSingleChannel.c

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//*****************************************************************************
//  MSP430F673x Demo - SD24_B, Continuous Conversion on a Single Channel
//
//  Description: This program uses the SD24_B module to perform continuous
//  conversions on a single channel. An SD24_B interrupt occurs when a
//  conversion has completed. Test by applying a voltage to channel 2
//  (SD2P0, SD2N0) and setting a breakpoint at the line indicated below.
//  Run program until it reaches the breakpoint, then use the debugger's
//  watch window to view the conversion results. Results (upper 16 bits only)
//  for channel 2 are stored in the array "results".
//  ACLK = n/a, MCLK = SMCLK = DCO =  ~ 1.1MHz
//  //* For Minimum Vcc required for SD24_B module - see datasheet          *//
//  //* 100nF cap between Vref and AVss is recommended when using 1.5V REF  *//
//
//                MSP430F673x
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//    Vin+ -->|SD2P0            |
//    Vin- -->|SD2N0            |
//            |                 |
//            |            VREF |---+
//            |                 |   |
//            |                 |  -+- 100nF
//            |                 |  -+-
//            |                 |   |
//            |            AVss |---+
//            |                 |
//
//  M. Swanson
//  Texas Instruments, Inc
//  December 2011
//  Built with CCS Version: 5.1.0 and IAR Embedded Workbench Version: 5.40.1
//*****************************************************************************
 
#include "driverlib.h"
 
#define Num_of_Results 8
 
/* Array to store SD24_B conversion results */
uint32_t results[Num_of_Results];
 
void main(void)
{
     WDT_A_hold(WDT_A_BASE); // Stop WDT
 
    // Select internal REF
    // Select SMCLK as SD24_B clock source
    SD24_B_initParam initParam = {0};
    initParam.clockSourceSelect = SD24_B_CLOCKSOURCE_SMCLK;
    initParam.clockPreDivider = SD24_B_PRECLOCKDIVIDER_1;
    initParam.clockDivider = SD24_B_CLOCKDIVIDER_1;
    initParam.referenceSelect = SD24_B_REF_INTERNAL;
    SD24_B_init(SD24_BASE, &initParam);
 
    SD24_B_setInterruptDelay(SD24_BASE,
            SD24_B_CONVERTER_2,
            SD24_B_THIRD_SAMPLE_INTERRUPT);
 
 
     // Enable channel 2 interrupt
    SD24_B_clearInterrupt(SD24_BASE,
            SD24_B_CONVERTER_2,
            SD24_B_CONVERTER_INTERRUPT  );
    SD24_B_enableInterrupt(SD24_BASE,
            SD24_B_CONVERTER_2,
            SD24_B_CONVERTER_INTERRUPT  );
 
    __delay_cycles(0x3600);                 // Delay for 1.5V REF startup
 
    SD24_B_startConverterConversion(SD24_BASE,
        2);                              // Set bit to start conversion
 
    __bis_SR_register(LPM0_bits | GIE);     // Enter LPM0 w/ interrupts
}
 
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=SD24B_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(SD24B_VECTOR)))
#endif
void SD24BISR(void)
{
    static uint16_t index = 0;
 
    switch (SD24BIV)
    {
        case SD24BIV_SD24OVIFG:             // SD24MEM Overflow
            break;
        case SD24BIV_SD24TRGIFG:            // SD24 Trigger IFG
            break;
        case SD24BIV_SD24IFG0:              // SD24MEM0 IFG
            break;
        case SD24BIV_SD24IFG1:              // SD24MEM1 IFG
            break;
        case SD24BIV_SD24IFG2:              // SD24MEM2 IFG
            results[index] =  SD24_B_getResults(SD24_BASE,
                    SD24_B_CONVERTER_2);                            // Save CH2 results (clears IFG)
            if (++index == Num_of_Results)
            {
                index = 0;                  // SET BREAKPOINT HERE
            }
            break;
    }
}