Hi, thank you for writing. CS is low I recognised. I wired it as you can see in the code. At first i want to test directly with SPI, later with SPI with DMA because its more complicated. From the example I changed the clock and EUSCI_B0_MODUL to EUSCI_B0_BASE because ...MODUL i isn't declared a msp432 i would say. It looks like this: /* MSP432 = SPI master, external device = SPI slave * * MSP432P401 ADS8699 * ----------------- ----------------- * | | | | * | 5V |-> ->| DVDD | * | | | | * | GND |-> ->| DGND | * | | | | | P4.3 |-> _CS ->| CST/CS | * | | | | * | P1.6 |-> Data Out (UCB0SIMO) ->| SDI | * | | | | * | P1.7 | Serial Clock Out (UCB0CLK) ->| SCLK | **********************************************************************************************/ #include #include #include #include static volatile uint8_t RXData[10]; static volatile uint8_t i = 0; static uint8_t TXData = 0; static uint8_t ii = 0; /* SPI Master Configuration Parameter */ const eUSCI_SPI_MasterConfig spiMasterConfig = { EUSCI_B_SPI_CLOCKSOURCE_SMCLK, // SMCLK Clock Source 3000000, // SMCLK = DCO = 3MHz 500000, // SPICLK = 500kHz EUSCI_B_SPI_MSB_FIRST, // MSB First EUSCI_B_SPI_PHASE_DATA_CHANGED_ONFIRST_CAPTURED_ON_NEXT, // Phase EUSCI_B_SPI_CLOCKPOLARITY_INACTIVITY_LOW, // low polarity EUSCI_B_SPI_3PIN // 3Wire SPI Mode }; int main(void) { volatile uint32_t ii; /* Halting WDT */ WDT_A_holdTimer(); /* Starting and enabling LFXT (3MHz) */ GPIO_setAsPeripheralModuleFunctionOutputPin(GPIO_PORT_PJ, GPIO_PIN0 | GPIO_PIN1, GPIO_PRIMARY_MODULE_FUNCTION); CS_setExternalClockSourceFrequency(3000000, 0); CS_initClockSignal(CS_SMCLK, CS_LFXTCLK_SELECT, CS_CLOCK_DIVIDER_1); CS_startLFXT(CS_LFXT_DRIVE0); /* Selecting P1.0 as LED */ GPIO_setAsOutputPin(GPIO_PORT_P1, GPIO_PIN0); GPIO_setOutputHighOnPin(GPIO_PORT_P1, GPIO_PIN0); GPIO_setOutputHighOnPin(GPIO_PORT_P1, GPIO_PIN0); /* SPI --> P4.3 = _CS, P1.5 = CLK, P1.6 = MOSI & P1.7 = MISO */ GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1, GPIO_PIN5 | GPIO_PIN6 | GPIO_PIN7, GPIO_PRIMARY_MODULE_FUNCTION); GPIO_setAsOutputPin(GPIO_PORT_P4, GPIO_PIN3); GPIO_setOutputLowOnPin(GPIO_PORT_P4, GPIO_PIN3); /* Configuring SPI in 3-wire master mode & enabling it & interrupts */ SPI_initMaster(EUSCI_B0_BASE, &spiMasterConfig); SPI_enableModule(EUSCI_B0_BASE); SPI_enableInterrupt(EUSCI_B0_BASE, EUSCI_B_SPI_RECEIVE_INTERRUPT); Interrupt_enableInterrupt(INT_EUSCIB0); //Interrupt_enableSleepOnIsrExit(); /* Delaying waiting for the module to initialize */ for(ii=0;ii<100;ii++); /* SPI, put _CS low P4.3 and polling to see if the TX buffer is ready or busy */ GPIO_setOutputLowOnPin(GPIO_PORT_P4, GPIO_PIN3); // TXData = 0x40; // while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT))); // SPI_transmitData(EUSCI_B0_BASE, TXData); // TXData = 0x00; // while (!(SPI_getInterruptStatus(EUSCI_B0_BASE,EUSCI_B_SPI_TRANSMIT_INTERRUPT))); // SPI_transmitData(EUSCI_B0_BASE, TXData); while(1) {} /*PCM_gotoLPM0(); __no_operation();*/ } void euscib0_isr(void) { int i = 0; uint32_t status = SPI_getEnabledInterruptStatus(EUSCI_B0_BASE); SPI_clearInterruptFlag(EUSCI_B0_BASE, status); if(status & EUSCI_B_SPI_RECEIVE_INTERRUPT) { RXData[i++] = SPI_receiveData(EUSCI_B0_BASE); if ((i % 2) == 1) { for( ii=0;ii<10;ii++); GPIO_setOutputLowOnPin(GPIO_PORT_P4, GPIO_PIN3); } GPIO_toggleOutputOnPin(GPIO_PORT_P1, GPIO_PIN0); for(i=0;i<48000000;i++); // delay 1s GPIO_toggleOutputOnPin(GPIO_PORT_P1, GPIO_PIN0); } } The Software is always at while(1), the function euscib0_isr() isn't entered. I think that with _CS low the ADC starts working and send an interrupt. But how does this work "send an interrupt" to the msp432?
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