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MSP432P401R透過SPI接收連續數據

user5121970
Intellectual 455 points
Other Parts Discussed in Thread: ADS1299

MSP432P401R為master，接收連續數據時，是否需要連續傳送0x00虛擬位元，才有辦法接收slave傳送過來的資料?

  • 0
    TI__Guru**** 252096 points
    连续接收时是不需要連續傳送0x00虛擬位元的
  • 0 回复 Susan Yang
    Intellectual 455 points

    可是如果沒有連續傳送0X00的話，我發現無法接收slave所傳送的資料。

    我是用ads1299作為slave傳送data給MSP432P401R，代碼如下

    結果在邏輯分析儀上有SPI的MISO有數據，但最後的B陣列裡面的數值不是正確的。

    我不清楚SPI接收連續數據的寫法是否有誤?

    #include <ti/devices/msp432p4xx/driverlib/driverlib.h>

/* Standard Includes */
#include <stdint.h>
#include <stdbool.h>
#define HZ  3000000UL
/* Statics */
static volatile uint8_t RXData = 0;
static uint8_t TXData = 0;
int i = 0;
int a = 0;
int z = 0;
int j = 0;
//#define A[500];
uint8_t A;
uint32_t B[1000];
//uint8_t A[500];

uint8_t hibyte,midbyte,lowbyte;
uint32_t intQA;

//![Simple SPI Config]
/* SPI Master Configuration Parameter */
const eUSCI_SPI_MasterConfig spiMasterConfig =
{
        EUSCI_B_SPI_CLOCKSOURCE_SMCLK,             // SMCLK Clock Source
        3000000,                                   // SMCLK = DCO = 3MHZ
        500000,                                    // *** = 500khz
        EUSCI_B_SPI_MSB_FIRST,                     // MSB First
        EUSCI_B_SPI_PHASE_DATA_CAPTURED_ONFIRST_CHANGED_ON_NEXT,    // Phase
        EUSCI_B_SPI_CLOCKPOLARITY_INACTIVITY_LOW, // LOW polarity
        EUSCI_B_SPI_3PIN                           // 3Wire SPI Mode
};
//![Simple SPI Config]

int main(void)
{
    /* Halting WDT  */
    WDT_A_holdTimer();

    //![Simple SPI Example]
    /* Selecting P1.5 P1.6 and P1.7 in SPI mode */
    GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1,
            GPIO_PIN5 | GPIO_PIN6 | GPIO_PIN7, GPIO_PRIMARY_MODULE_FUNCTION);

    /* Configuring SPI in 3wire master mode */
    SPI_initMaster(EUSCI_B0_BASE, &spiMasterConfig);

    /* Enable SPI module */
    SPI_enableModule(EUSCI_B0_BASE);

    /* Enabling interrupts */
    //SPI_enableInterrupt(EUSCI_B0_BASE, EUSCI_B_SPI_RECEIVE_INTERRUPT);
    //Interrupt_enableInterrupt(INT_EUSCIB0);
    //Interrupt_enableSleepOnIsrExit();


    //初始化ADS1299

    P3->DIR |= BIT0;
    P3->OUT ^= BIT0; //CS_Low
    __delay_cycles(HZ);
    P3->DIR |= BIT5;
    P3->OUT =  BIT5;       //CLKSEL High
    __delay_cycles(HZ/1000);

    P5->DIR |= BIT1;
    P5->OUT =  BIT1;       //PWDN High
    __delay_cycles(HZ);


    P2->DIR |= BIT7;
    P2->OUT = BIT7;      //RESET High
    __delay_cycles(HZ);


    P2->DIR |= BIT7;
    P2->OUT ^= BIT7;      //RESET LOW
    __delay_cycles(HZ);

    P2->DIR |= BIT7;
    P2->OUT = BIT7;      //RESET High
    __delay_cycles(HZ);
    ///////////////////////////////////////////////////

    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x11);  //SDATAC


    //CONFIG3
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x43);  //CONFIG3
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);  //CONFIG3
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0xE0);  //CONFIG3

    //CONFIG1
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x41);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x96);//採樣率250


    //CONFIG2
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x42);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0xD0);

    //Channel1
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x45);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x65);
    //SPI_transmitData(EUSCI_B0_BASE, 0x61);

    //Channel2
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x46);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x61);

    //Channel3
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x47);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x61);

    //Channel4
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x48);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x61);

    //Channel5
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x49);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x61);

    //Channel6
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x4A);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x61);

    //Channel7
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x4B);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x61);

    //Channel8
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x4C);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x00);
    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x61);


    P2->DIR |= BIT6;
    P2->OUT |= BIT6;    //Set Start High

    while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT)));
    SPI_transmitData(EUSCI_B0_BASE, 0x10);  //RDATAC


    for(i;i<1000;i++)
    {
        int32_t outputcode = adc_read_data();
        B[a] = outputcode;
        a++;
    }
    //PCM_gotoLPM0();
    //__no_operation();
}

uint8_t read_continue_data(){
    SPI_transmitData(EUSCI_B0_BASE, 0x00); //傳送虛擬位元0x00
    A = SPI_receiveData(EUSCI_B0_BASE); //將接收到的資料存進A陣列
    //return read_continue_data;
   // return 0;
}

uint32_t adc_read_data(void)
{
    uint8_t adcCode[3];


    adcCode[0] = read_continue_data();
    adcCode[1] = read_continue_data();
    adcCode[2] = read_continue_data();

    return ((int32_t)(((adcCode[0] & 0x80) ? (0x00) : (0xFF))   ) << 24) |
                                             ((adcCode[0] & 0xFF) << 16) |
                                             ((adcCode[1] & 0xFF) << 8 ) |
                                             ((adcCode[2] & 0xFF) << 0 ) ;
}

  • 0 回复 user5121970
    Prodigy 150 points
    连续接收时是需要连续发送的，SPI是环状的，也就是说，master需要不断发送字节才能接收slave的数据。
    看了你的程序，直接使用了底层的 DriverLib开发，这需要对寄存器很熟悉，而且程序显得非常复杂，开发效率很低。建议你在 simplelink_msp432p4_sdk 上开发程序，调用 TI-DRIVER 层的 API，程序会大幅度简化。 simplelink_msp432p4_sdk安装之后，里面有关于 SPI 的例子程序