P5OUT ^= (~BIT0) //LED toggle when entered into this function UCA1CTLW0 &= ~UCSWRST // **Initialize USCI state machine** UCA1CTLW0 |= UCSSEL_0 // UCxCLK in slave mode UCA1CTLW0 |= UCSYNC | UCCKPH | UCMSB |UCMODE_2 // 4-pin, 8-bit SPI slave, UCA1CTLW0 |= UCSWRST // **Put state machine in reset** P3MAP2 = PM_UCA1STE // STE port mapped to port 3.2
WDTCTL = WDTPW | WDTHOLD //stop watchdog timer Kindly check any configuration is missing here. but no activity observed from slave side. STE pin (I assume it is chip select for 4pin slave mode) is pulled down when SPI data transfer. When a byte of data is sent from master, MSP430 doesn't entering into the ISR function. Here we have configured MSP430 eUSCI_A1 for 4 pin spi slave. We are facing issue in MSP430F6779 when using source code of TIDA - 00222 power measurement reference.
