【TI 技术资料分享】spi通信
2019-07-30 16:31发布
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MSP430F149的两个USATR 在实现SPI通讯,采用中断接受
- #include <msp430x14x.h>
- void main(void)
- {
- volatile unsigned int i;
- WDTCTL = WDTPW + WDTHOLD; // Stop watchdog
- P1OUT = 0x00; // P1.0 setup for LED output
- P1DIR |= 0x03;
- P5SEL |= 0x0E; // P5.1,2,3 SPI option select
- P5OUT &= ~0x01;
- P5DIR |= 0x01; //Reset Slave
- P5DIR &= ~0x01;
- U1CTL = CHAR + SYNC + MM + SWRST; // 8-bit, SPI, Master
- U1TCTL = CKPL + SSEL1 + STC; // Polarity, SMCLK, 3-wire
- U1BR0 = 0x02; // SPICLK = SMCLK/2
- U1BR1 = 0x00;
- U1MCTL = 0x00;
- ME2 |= USPIE1; // Module enable
- U1CTL &= ~SWRST; // SPI enable
- IE2 |= URXIE1 + UTXIE1; // RX and TX interrupt enable
- for (i = 0xFFF; i > 0; i--); // Time for slave to ready
- _BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
- }
- #pragma vector=USART1RX_VECTOR
- __interrupt void SPI1_rx (void)
- {
- P1OUT = RXBUF1; // RXBUF1 to TXBUF1
- }
- #pragma vector=USART1TX_VECTOR
- __interrupt void SPI1_tx (void)
- {
- unsigned int i;
- i = P1IN;
- i = i >> 4;
- TXBUF1 = i; // Transmit character
- }
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