PCF2123实时时钟

只看该作者 · 2014-9-25 15:38

大家好！最近在捣鼓PCF2123实时时钟芯片，用的是MSP430FR5723的硬件SP1口与之通信，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);

}