以下是正常工作的MSP430F1611程序里的SPI初始化和读写操作。
LSpiInit(void)
{
/* config SPI interface */
U0CTL = 0;
U0CTL = SWRST; //HOLD reset
U0CTL |= CHAR + SYNC + SWRST + MM; // 0001 0111
U0TCTL = STC | SSEL0 | CKPH; //1001 0010
/* set baud rate = 1MHz , ACLK = 8MHz*/
U0BR0 = 0x08;
U0BR1 = 0X00;
U0MCTL = 0X00;
/* enable SPI mode for USART */
ME1 |= USPIE0;
/* release USART from reset */
U0CTL &= ~SWRST;
P3SEL = BIT1 + BIT2 + BIT3;
return(0);
}
LSpiRead(UINT addr)
{
U0TXBUF = (UD8)addr;
while(!((IFG1) & ((0x80))));
/*
* Write dummy byte to SPI TX buf, then wait for SPI interface to finish
* transmitting both the address and the dummy byte to the device. Note
* when the SPI interface transmits the dummy byte, it will also receive
* the data value from the device.
*/
U0TXBUF = 0;
while(!((U0TCTL) & ((0x01))));
/* return value received from device */
return(U0RXBUF);
}
LSpiWrite(UINT addr, UINT val)
{
U0TXBUF = (UD8)addr;
while(!((IFG1) & ((0x80))));
/*
* Write value to SPI TX buf, then wait for SPI interface to finish
* transmitting both the address and the value to the device.
*/
U0TXBUF = (UD8)val;
while(!((U0TCTL) & ((0x01))));
}
本人将以上程序移植到MSP430F5528中时，却不行，读到的值都为0。程序如下：
LSpiInit(void)
{
UCB0CTL1 = 0;
UCB0CTL1 = UCSWRST; // USCI logic held in reset state
UCB0CTL0 |= UCMST + UCSYNC + UCMSB + UCMODE_0 + UCCKPH;
UCB0CTL1 |= UCSSEL__ACLK + UCSWRST;
/* set baud rate = 1MHz , ACLK = 8MHz*/
UCB0BR0 = 0x08;
UCB0BR1 = 0x00;
P3SEL |= BIT2 + BIT0 + BIT1;
P3DIR |= BIT2 + BIT0;
UCB0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
return(0);
}
LSpiRead(UINT addr)
{
UCB0TXBUF = (UD8)addr;
while (!( UCB0IFG & UCTXIFG));
UCB0TXBUF = 0;
// while(UCB0STAT & UCBUSY);
while (!( UCB0IFG & UCRXIFG));
return(UCB0RXBUF);
}
LSpiWrite(UINT addr, UINT val)
{
UCB0TXBUF = (UD8)addr;
while (!( UCB0IFG & UCTXIFG));
UCB0TXBUF = (UD8)val;
// while(UCB0STAT & UCBUSY);
while (!( UCB0IFG & UCRXIFG));
}
求大侠指教啊
