大家好!最近在捣鼓MSP430FR5723的硬件SP1口与CF2123实时时钟芯片,做一个实时时钟,现在问题是读不出时间,不知道在哪出来问题。
SP1主要通信如下:unsigned char SPITransfer(unsigned char aout)
{
unsigned char data1;
while (!(UCB0IFG&UCTXIFG));
UCB0TXBUF=aout;
while (!(UCB0IFG&UCRXIFG));
data1= UCB0RXBUF;
return(data1);
}
unsigned char RTCReadReg(unsigned char aReg)
{
unsigned char result;
P2OUT |= BIT4; //ce=1;
SPITransfer(aReg|0x90); //读数据指令
result=SPITransfer(0xff); //度一字节返回数据
P2OUT &= ~BIT4; //ce=0;
return(result);
}
void RTCWriteReg(unsigned char aReg,unsigned char aValue)
{
P2OUT |= BIT4; //ce=1;
SPITransfer(aReg|0x10); //写指令
SPITransfer(aValue);
P2OUT &= ~BIT4; //ce=0;
}
时钟配置:
void RTCConfigure()
{
RTCWriteReg(0x00,0x00);
RTCWriteReg(0x01,0x00);
RTCWriteReg(0x02,0x04);
RTCWriteReg(0x04,0x02);
RTCWriteReg(0x03,0x03);
RTCWriteReg(0x07,0x01);
RTCWriteReg(0x05,0x01);
RTCWriteReg(0x08,0x00);
// RTCWriteReg(0x00,0x00);
}
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer to prevent time out reset
sys_clock();
GPIO_Init();
SPI_Init();
RTCConfigure();
//__enable_interrupt() ;
while(1)
{
sec=RTCReadReg(0x02);
min=RTCReadReg(0x03);
hou=RTCReadReg(0x04);
day=RTCReadReg(0x05);
mon=RTCReadReg(0x07);
year=RTCReadReg(0x08);
} |