SPI.rar_430 spi_SPI验证

//****************************************************************************** // MSP430x24x Demo - USCI_A0, SPI Interface to HC164 Shift Register // // Description: This program demonstrates USCI_A0 in SPI mode, interfaced to // a 'HC164 shift register' (Serial In, Parallel Out), transferring the value // contained in Data.The value is incremented in the mainloop, effectively // incrementing HC164 QA - QH. // ACLK = n/a, MCLK = SMCLK = default DCO ~1.045Mhz, BRCLK = SMCLK/2 // // MSP430F249 // ----------------- // /|\| XIN|- // | | | ^ HC164 // --|RST XOUT|- | ------------- // | | |-|/CLR,B | 8 // | UCA0SIMO/P3.4|--------->|A Qx|--\-> // | UCA0CLK/P3.0|--------->|CLK | // | | | | // // B. Nisarga // Texas Instruments Inc. // September 2007 // Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.42A //****************************************************************************** #include "msp430x24x.h" unsigned char Data; volatile unsigned int i,j; unsigned char seg_seven[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; unsigned char shaomiao_wei[]={0x01,0x02,0x04,0x08}; void main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer P3SEL |= 0x11; // P3.0,4 USCI_A0 option select UCA0CTL0 |= UCCKPH + UCMSB + UCMST + UCSYNC; // 3-pin, 8-bit SPI master UCA0CTL1 |= UCSSEL_2; // SMCLK UCA0BR0 |= 0x02; UCA0BR1 = 0; UCA0MCTL = 0; UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine** P1DIR=BIT0; Data = 0x0FF; // Load inital data while(1) { Data++; // Increment Data value - Set BREAKPOINT here while (!(IFG2 & UCA0TXIFG)); // USCI_A0 TX buffer ready? UCA0TXBUF = seg_seven[3]; // Byte to SPI TXBUF P1OUT=BIT0; for(i = 0xfff; i > 0; i--); // Delay j++; if(j==10) j=0; P1OUT=~BIT0; for(i = 0xfff; i > 0; i--); // Delay } }