[资料分享] 分享关于MSP432 DMA pingpong模式

这个是官方的pingpong模式 可是一直没有调通  如果有会的  可以帮忙弄一下吗  谢谢  
问题就是  每次在在我停止运行程序之后，再次运行程序两个数组的数据就不再改变

我想知道  我究竟应该怎么做这件事情  谢谢 才能用MSP432pingpong模式实现pingpong缓存


#include "driverlib.h"

/* Standard Includes */
#include
#include





#define TEST_LENGTH_SAMPLES 512
#define SAMPLE_LENGTH 512

/* ------------------------------------------------------------------
* Global variables for FFT Bin Example
* ------------------------------------------------------------------- */
uint32_t fftSize = SAMPLE_LENGTH;
uint32_t ifftFlag = 0;
uint32_t doBitReverse = 1;


#define SMCLK_FREQUENCY     48000000
#define SAMPLE_FREQUENCY    8000


/* DMA Control Table */
#ifdef ewarm
#pragma data_alignment=256
#else
#pragma DATA_ALIGN(controlTable, 256)
#endif
uint8_t controlTable[256];


/* FFT data/processing buffers*/
float hann[SAMPLE_LENGTH];
int16_t data_array1[SAMPLE_LENGTH];
int16_t data_array2[SAMPLE_LENGTH];
int16_t data_array3[SAMPLE_LENGTH];
int16_t data_array4[SAMPLE_LENGTH];

volatile int switch_data = 0;

uint32_t color = 0;

/* Timer_A PWM Configuration Parameter */
Timer_A_PWMConfig pwmConfig =
{
        TIMER_A_CLOCKSOURCE_SMCLK,
        TIMER_A_CLOCKSOURCE_DIVIDER_1,
        (SMCLK_FREQUENCY/SAMPLE_FREQUENCY),
        TIMER_A_CAPTURECOMPARE_REGISTER_1,
        TIMER_A_OUTPUTMODE_SET_RESET,
        (SMCLK_FREQUENCY/SAMPLE_FREQUENCY)/2
};

void main(void)
{
    /* Halting WDT and disabling master interrupts */
    MAP_WDT_A_holdTimer();
    MAP_Interrupt_disableMaster();
    switch_data = 0;
    /* Set the core voltage level to VCORE1 */
    MAP_PCM_setCoreVoltageLevel(PCM_VCORE1);

    /* Set 2 flash wait states for Flash bank 0 and 1*/
    MAP_FlashCtl_setWaitState(FLASH_BANK0, 2);
    MAP_FlashCtl_setWaitState(FLASH_BANK1, 2);

    /* Initializes Clock System */
    MAP_CS_setDCOCenteredFrequency(CS_DCO_FREQUENCY_48);
    MAP_CS_initClockSignal(CS_MCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_1 );
    MAP_CS_initClockSignal(CS_HSMCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_1 );
    MAP_CS_initClockSignal(CS_SMCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_1 );
    MAP_CS_initClockSignal(CS_ACLK, CS_REFOCLK_SELECT, CS_CLOCK_DIVIDER_1);



    /* Configuring Timer_A to have a period of approximately 500ms and
     * an initial duty cycle of 10% of that (3200 ticks)  */
    Timer_A_generatePWM(TIMER_A0_BASE, &pwmConfig);

    /* Initializing ADC (MCLK/1/1) */
    ADC14_enableModule();
    ADC14_initModule(ADC_CLOCKSOURCE_MCLK, ADC_PREDIVIDER_1, ADC_DIVIDER_1, 0);

    ADC14_setSampleHoldTrigger(ADC_TRIGGER_SOURCE1, false);

    /* Configuring GPIOs (4.3 A10) */
    GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P4, GPIO_PIN3,
    GPIO_TERTIARY_MODULE_FUNCTION);

    /* Configuring ADC Memory */
    ADC14_configureSingleSampleMode(ADC_MEM0, true);
    ADC14_configureConversionMemory(ADC_MEM0, ADC_VREFPOS_AVCC_VREFNEG_VSS,
    ADC_INPUT_A10, false);

    /* Set ADC result format to signed binary */
    ADC14_setResultFormat(ADC_UNSIGNED_BINARY);

    /* Configuring DMA module */
    DMA_enableModule();
    DMA_setControlBase(controlTable);


    DMA_disableChannelAttribute(DMA_CH7_ADC14,
                                 UDMA_ATTR_ALTSELECT | UDMA_ATTR_USEBURST |
                                 UDMA_ATTR_HIGH_PRIORITY |
                                 UDMA_ATTR_REQMASK);


    /* Setting Control Indexes. In this case we will set the source of the
     * DMA transfer to ADC14 Memory 0
     *  and the destination to the
     * destination data array. */
    MAP_DMA_setChannelControl(UDMA_PRI_SELECT | DMA_CH7_ADC14,
        UDMA_SIZE_16 | UDMA_SRC_INC_NONE | UDMA_DST_INC_16 | UDMA_ARB_1);
    MAP_DMA_setChannelTransfer(UDMA_PRI_SELECT | DMA_CH7_ADC14,
        UDMA_MODE_PINGPONG, (void*) &ADC14->MEM[0],
        data_array1, SAMPLE_LENGTH);

    MAP_DMA_setChannelControl(UDMA_ALT_SELECT | DMA_CH7_ADC14,
        UDMA_SIZE_16 | UDMA_SRC_INC_NONE | UDMA_DST_INC_16 | UDMA_ARB_1);
    MAP_DMA_setChannelTransfer(UDMA_ALT_SELECT | DMA_CH7_ADC14,
        UDMA_MODE_PINGPONG, (void*) &ADC14->MEM[0],
        data_array2, SAMPLE_LENGTH);

    /* Assigning/Enabling Interrupts */
    MAP_DMA_assignInterrupt(DMA_INT1, 7);
    MAP_Interrupt_enableInterrupt(INT_DMA_INT1);
    MAP_DMA_assignChannel(DMA_CH7_ADC14);
    MAP_DMA_clearInterruptFlag(7);
    MAP_Interrupt_enableMaster();

    /* Now that the DMA is primed and setup, enabling the channels. The ADC14
     * hardware should take over and transfer/receive all bytes */
    MAP_DMA_enableChannel(7);
    MAP_ADC14_enableConversion();

    while(1)
    {
        MAP_PCM_gotoLPM0();
        __delay_cycles(200000);
    }
}


/* Completion interrupt for ADC14 MEM0 */
void DMA_INT1_IRQHandler(void)
{
    /* Switch between primary and alternate bufferes with DMA's PingPong mode */
    if (DMA_getChannelAttribute(7) & UDMA_ATTR_ALTSELECT)
    {
        DMA_setChannelControl(UDMA_PRI_SELECT | DMA_CH7_ADC14,
            UDMA_SIZE_16 | UDMA_SRC_INC_NONE | UDMA_DST_INC_16 | UDMA_ARB_1);
        DMA_setChannelTransfer(UDMA_PRI_SELECT | DMA_CH7_ADC14,
            UDMA_MODE_PINGPONG, (void*) &ADC14->MEM[0],
            data_array1, SAMPLE_LENGTH);
        switch_data = 1;
    }
    else
    {
        DMA_setChannelControl(UDMA_ALT_SELECT | DMA_CH7_ADC14,
            UDMA_SIZE_16 | UDMA_SRC_INC_NONE | UDMA_DST_INC_16 | UDMA_ARB_1);
        DMA_setChannelTransfer(UDMA_ALT_SELECT | DMA_CH7_ADC14,
            UDMA_MODE_PINGPONG, (void*) &ADC14->MEM[0],
            data_array2, SAMPLE_LENGTH);
        switch_data = 0;
    }
}