sd24_b_ex1_singleConvSingleChannel.c

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#include "driverlib.h"
 
//*****************************************************************************
//  MSP430F673x Demo - SD24_B, Single Conversion on Single Channel Polling IFG
//
//  Description: This program uses the SD24_B module to perform a single
//  conversion on a single channel. The SD24_B interrupt flag for channel 2 is
//  polled to determine 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 variable "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
//*****************************************************************************
 
/* uint32_t to store SD24_B conversion result */
uint32_t 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_initConverterParam initConverterParam = {0};
    initConverterParam.converter = SD24_B_CONVERTER_2;
    initConverterParam.alignment = SD24_B_ALIGN_RIGHT;
    initConverterParam.startSelect = SD24_B_CONVERSION_SELECT_SD24SC;
    initConverterParam.conversionMode = SD24_B_SINGLE_MODE;
    SD24_B_initConverter(SD24_BASE, &initConverterParam);
 
    __delay_cycles(0x3600);                   // Delay for 1.5V REF startup
 
    while (1)
    {
        SD24_B_startConverterConversion(SD24_BASE,
            SD24_B_CONVERTER_2);                                 // Set bit to start conversion
 
        // Poll interrupt flag for channel 2
        while( SD24_B_getInterruptStatus(SD24_BASE,
            SD24_B_CONVERTER_2,
            SD24_B_CONVERTER_INTERRUPT) == 0 );
 
        results = SD24_B_getResults(SD24_BASE,
            SD24_B_CONVERTER_2);                            // Save CH2 results (clears IFG)
 
        __no_operation();                     // SET BREAKPOINT HERE
    }
}