[LaunchPad] 使用两块launchpad SPI传数据

luooove 2014-10-18 21:10 楼主

用两块launchpad传SPI数据，一端发送一端接收，接收一端再用串口传给电脑显示。这是项目中一小段调试的程序。发送程序

#include

unsigned char MST_Data, SLV_Data;

int main(void)

{

volatile unsigned int i;

WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer

P1OUT = 0x00; // P1 setup for LED & reset output

P1DIR |= BIT0 + BIT5; //

P1SEL = BIT1 + BIT2 + BIT4;

P1SEL2 = BIT1 + BIT2 + BIT4;

UCA0CTL0 |= UCCKPL + UCMSB + UCMST + UCSYNC; // 3-pin, 8-bit SPI master

UCA0CTL1 |= UCSSEL_2; // SMCLK

UCA0BR0 |= 0x02; // /2

UCA0BR1 = 0; //

UCA0MCTL = 0; // No modulation

UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**

IE2 |= UCA0RXIE; // Enable USCI0 RX interrupt

P1OUT &= ~BIT5; // Now with SPI signals initialized,

P1OUT |= BIT5; // reset slave

__delay_cycles(75); // Wait for slave to initialize

MST_Data = 0x01; // Initialize data values

while(1)

{

UCA0TXBUF = MST_Data; // Transmit first character

MST_Data++;

__delay_cycles(1000);

}

//__bis_SR_register(LPM0_bits + GIE); // CPU off, enable interrupts

}

接收程序 #include int main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer while (!(P1IN & BIT5)); // If clock sig from mstr stays low, // it is not yet in SPI mode // P1DIR |= BIT6; // P1OUT |= BIT6; BCSCTL1 = CALBC1_16MHZ; // Set DCO DCOCTL = CALDCO_16MHZ; P1SEL = BIT1 + BIT2 + BIT5 + BIT6 + BIT7; // P1.1 = RXD, P1.2=TXD P1SEL2 = BIT1 + BIT2 + BIT5 + BIT6 + BIT7; UCA0CTL1 |= UCSSEL_2; // SMCLK UCA0BR0 = 0x82; // 16MHz 9600 UCA0BRX=1666=0x0682 UCA0BR1 = 0x06; // 16MHz 9600 UCA0MCTL = UCBRS2 + UCBRS1; // Modulation UCBRSx = 6 UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine** IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt UCB0CTL1 = UCSWRST; // **Put state machine in reset** UCB0CTL0 |= UCCKPL + UCMSB + UCSYNC; // 3-pin, 8-bit SPI master UCB0CTL1 &= ~UCSWRST; // **Initialize USCI state machine** IE2 |= UCB0RXIE; // Enable USCI0 RX interrupt __bis_SR_register(LPM4_bits + GIE); // Enter LPM4, enable interrupts } #pragma vector=USCIAB0RX_VECTOR __interrupt void USCI0RX_ISR(void) { while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready? UCA0TXBUF = UCB0RXBUF; // TX -> RXed character } 测试通过可以。