I'm working with MSP430G2553 launch pad. When i use SPI master mode example code, it work fine. But when i try another code without interrupt, i can't generate the serial clock in pin1.5 (UCB0CLK) it's just noise signal. Is there any relative between clock signal and interrupt ? This is code:
volatile char received_ch = 0;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT P1SEL = BIT6 | BIT7 | BIT5;P1SEL2 = BIT6 | BIT7 | BIT5;UCB0CTL1 = UCSWRSTUCB0CTL0 |= UCMSB + UCMST + UCSYNC; // 3-pin, 8-bit SPI masterUCB0CTL1 |= UCSSEL_2; // SMCLKUCB0BR0 |= 0x02; // /2UCB0BR1 = 0; //UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**while (!(IFG2 & UCB0TXIFG)); // USCI_A0 TX buffer ready?UCB0TXBUF = 0xAA; // Send 0xAA over SPI to Slavewhile (!(IFG2 & UCB0RXIFG)); // USCI_A0 RX Received? received_ch = UCB0RXBUF; // Store received data One more question. When i want to set the clock polarity or clock phase, do i need to following these instructions:
UCB0CTL1 |= UCSWRST
// CKPL =1 or CKPH =1
UCB0CTL1 &= ~UCSWRST;
