TI中文支持网程序采用官方测试程序，使用该程序SCLK、MOSI、MISO线有数据，但是将中断关闭后只发送数据，SCLK、MISO线无数据，MOSI一直高电平。
将WDTCTL = WDTPW+WDTHOLD;该行注释后，不用中断函数只发送数据，SCLK、MOSI线数据正常。
请问各位，关闭看门狗后，不使用spi中断，为什么SCLK没有信号呢？我应该怎么处理
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//******************************************************************************
// MSP430F534x Demo – USCI_A0, SPI 3-Wire Master Incremented Data
//
// Description: SPI master talks to SPI slave using 3-wire mode. Incrementing
// data is sent by the master starting at 0x01. Received data is expected to
// be same as the previous transmission. USCI RX ISR is used to handle
// communication with the CPU, normally in LPM0. If high, P1.0 indicates
// valid data reception. Because all execution after LPM0 is in ISRs,
// initialization waits for DCO to stabilize against ACLK.
// ACLK = ~32.768kHz, MCLK = SMCLK = DCO ~ 1048kHz. BRCLK = SMCLK/2
//
// Use with SPI Slave Data Echo code example. If slave is in debug mode, P1.1
// slave reset signal conflicts with slave's JTAG; to work around, use IAR's
// "Release JTAG on Go" on slave device. If breakpoints are set in
// slave RX ISR, master must stopped also to avoid overrunning slave
// RXBUF.
//
// MSP430F534x
// —————–
// /|\| |
// | | |
// –|RST P1.0|-> LED
// | |
// | P3.3|-> Master Data Out (UCA0SIMO)
// | |
// | P3.4|<- Master Data In (UCA0SOMI)
// | |
// Slave reset <-|P1.1 P2.7|-> Serial Clock Out (UCA0CLK)
//
//
// Bhargavi Nisarga
// Texas Instruments Inc.
// Jun 2011
// Built with CCSv4 and IAR Embedded Workbench Version: 4.21
//******************************************************************************
#include <msp430.h>
#define SPI_SIMO BIT4
#define SPI_SOMI BIT5
#define SPI_CLK BIT0
#define SD_CS BIT7
// Ports
#define SPI_SEL P2SEL
#define SPI_DIR P2DIR
#define SPI_OUT P2OUT
#define SPI_REN P2REN
unsigned char MST_Data,SLV_Data;
unsigned char temp;
int main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P5OUT |= BIT6; // Set P5.6 for LED
// Set P1.1 for slave reset
P5DIR |= BIT6; // Set P1.0-2 to output direction
P2SEL |= BIT0+BIT4+BIT5; // P3.3,4 option select
// P2SEL |= BIT7; // P2.7 option select
P2DIR |= BIT7; //P2.7 RST
UCA0CTL1 |= UCSWRST; // **Put state machine in reset**
UCA0CTL0 |= UCMST+UCSYNC+UCMSB; // 3-pin, 8-bit SPI master
UCA0CTL0 &=~ UCCKPH ; // SPI MODE 0 设置极性和相位
UCA0CTL0 &=~ UCCKPL;
// Clock polarity high, MSB
UCA0CTL1 |= UCSSEL_2; // SMCLK
UCA0BR0 = 0x02; // /2
UCA0BR1 = 0; //
UCA0MCTL = 0; // No modulation
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
UCA0IE |= UCRXIE; // Enable USCI_A0 RX interrupt
P2OUT &= ~BIT7; // Now with SPI signals initialized,
P2OUT |= BIT7; // reset slave
for(i=50;i>0;i–); // Wait for slave to initialize
MST_Data = 0x01; // Initialize data values
SLV_Data = 0x00; //
while (!(UCA0IFG&UCTXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = MST_Data; // Transmit first character
SPI_send(0xff);
__bis_SR_register(LPM0_bits + GIE); // CPU off, enable interrupts
}
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)
#else
#error Compiler not supported!
#endif
{
volatile unsigned int i;
switch(__even_in_range(UCA0IV,4))
{
case 0: break; // Vector 0 – no interrupt
case 2: // Vector 2 – RXIFG
while (!(UCA0IFG&UCTXIFG)); // USCI_A0 TX buffer ready?
if (UCA0RXBUF==SLV_Data) // Test for correct character RX'd
P5OUT &=~ BIT6; // If correct, light LED
else
P5OUT |= BIT6; // If incorrect, clear LED
MST_Data++; // Increment data
SLV_Data++;
UCA0TXBUF = MST_Data; // Send next value
for(i = 20; i>0; i–); // Add time between transmissions to
// make sure slave can process information
break;
case 4: break; // Vector 4 – TXIFG
default: break;
}
}
Peng Huang1：
在调试过程中，不采用中断接收。只能在while（1）中才能测量出SCLK、MOSI线上的数据，在while（1）之外执行发送数据指令，无法测出时钟和数据？这是为什么呢？不加WDTCTL = WDTPW+WDTHOLD; 能测量时钟和数据
