各位，新年好！祝大家新年工作愉快！
谁能给我个硬件I2C操作AT24C02的程序？
我老是卡住，有时通有时不通，谁能帮帮忙啊，郁闷了很久！
下面是我的程序，哪位有空帮看下:
void I2CInit(unsigned char SA)
{
P3SEL |= 0x06; // Assign I2C pins to USCI_B0
UCB0CTL1 |= UCSWRST; // Enable SW reset
UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC; // I2C Master, synchronous mode
UCB0CTL1 = UCSSEL_2 + UCSWRST; // Use SMCLK, keep SW reset
UCB0BR0 = 80; // fSCL = SMCLK/80 = ~100kHz
UCB0BR1 = 0;
UCB0I2CSA = SA; // Slave Address is 2ch
UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation
}
uint16 NVMRead(uint16 addr)
{
unsigned char data;
I2CInit(0x50);
while (UCB0CTL1 & UCTXSTP); // Ensure stop condition got sent
UCB0CTL1 |= UCTR + UCTXSTT; // I2C TX, start condition
while((IFG2 & UCB0TXIFG)==0);
UCB0TXBUF = (unsigned char) (addr&0x00ff);////eeprom low addr
while((IFG2 & UCB0TXIFG)==0); //老是卡在这个位置,而且断电重来都不行.但是有时候通,只要不通了断电也没用。
IFG2 &= ~UCB0TXIFG;
UCB0CTL1 &= ~UCTR; // I2C RX,
while (UCB0CTL1 & UCTXSTP); // 判断总线是否被释放
UCB0CTL1 |= UCTXSTT; // Start condition
while((UCB0CTL1&UCTXSTT)==1);
while((IFG2&UCB0RXIFG)==0);
data = UCB0RXBUF;
delay100us();
UCB0CTL1 |= UCTXSTP + UCTXNACK;
while((UCB0CTL1 & UCTXSTP)==1);
return data;
}
uint8 NVMWrite(uint16 addr, uint8 data)
{
I2CInit(0x50);
while (UCB0CTL1 & UCTXSTP); // Ensure stop condition got sent
UCB0CTL1 |= UCTR + UCTXSTT; // I2C TX, start condition
while((IFG2 & UCB0TXIFG)==0);
UCB0TXBUF = (unsigned char) (addr&0x00ff);
while((IFG2 & UCB0TXIFG)==0);
UCB0TXBUF = data;
while((IFG2 & UCB0TXIFG)==0);
UCB0CTL1 |= UCTXSTP + UCTXNACK; // I2C stop condition
while((UCB0CTL1 & UCTXSTP)==1);
delayms(10);
return 1;
}
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
BCSCTL1=CALBC1_16MHZ;
DCOCTL=CALDCO_16MHZ; //DCOCLK设置16M
BCSCTL2 = DIVM0 | DIVS0; //16M DCOCLK经2分频得到8M MCLK和8M SMCLK
NVMRead(0);
}
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