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?
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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?
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 ) ; }