使用MCC代码实现PIC18f46k42的I2C问题读取字节

HI——我使用MCC生成的I2C代码从设备寄存器（RTCC时钟）读取字节。作用域跟踪显示处理器写入设备地址和寄存器号，然后用读取位组再次写入地址（所有设备都被OK确定），但是读取两个字节而不是仅一个字节，并使总线处于奇数状态-数据和时钟线都保持低电平。简单地重置板（一个XPress板）并不能修复这个问题——在复位后，它等待第一个“开始”的完成。被调用的代码是：（对不起，我不知道如何将这个显示作为代码）UIT88T I2C1AREDIREBYTER（UIT88T地址，UIT88T REG）{UIT88T结果＝0；I2C。（地址& lt；lt；1）；I2C1CON0BIT。R2SEN＝1；I2C1CON0BIT。S＝1；//STATE WAIT4STATESTORIDENE（）；SeNEdEnter（ReG）；WaIT4MDRSET计数（1）；地址＝（UIT88T）（地址和lt；lt；1）；I2C1ADB1=（UIT88T）（地址0x01）；/ /改变R/W位读取I2C1CON0BIT。RSEN＝0；I2；I2；I2C1ADB1=（uTn8It）C1CON0BIT，S＝1；//STATE WAIT4STATESTORIDENE（）；结果＝收件人（）；WaIT4Stutter（）；返回结果；它是否看起来像是在处理主状态的过程中丢失了什么东西，允许处理器读取两个字节，然后阻止它完成它的事务？我的设置是：MPLAB X V4.15XC8 V1.45 MCC V3.55.1MPLAB XPICPIC18F46K42评估Boad感谢这个词上的任何字。



      以下为原文

    Hi --
I'm using MCC generated I2C code to read a byte from a device register (RTCC clock).  Scope trace shows the processor writing the device address and register number, then writing the address again with the read bit set (all ACKed OK by the device), but then reading two bytes instead of just one and leaving the bus in an odd state -- both data and clock lines held low.  Simply resetting the board (an Xpress board) doesn't fix this -- after reset it hangs up waiting for the first 'start' to be completed.

The code being called is: (sorry, I don't know how to make this display as code)

uint8_t i2c1_read1ByteRegister(uint8_t address, uint8_t reg)
{
uint8_t result = 0;
I2C1_Initialize();
I2C1ADB1= (uint8_t)(address<<1);
I2C1CNT=1;
I2C1CON0bits.RSEN=1;
I2C1CON0bits.S=1; //Start
wait4StartComplete();
sendByte(reg);
wait4MDRSetcount(1);
address = (uint8_t)(address<<1);
I2C1ADB1= (uint8_t)(address| 0x01); //Change the R/W bit for read
I2C1CON0bits.RSEN=0;
I2C1CON0bits.S=1; //Start
wait4StartComplete();
result = receiveByte();
wait4Stop();
return result;
}

Does it look like something is missing in the way the master states are being handled that allows the processor to read two bytes then keeps it from finishing its transaction?

My setup is:
MPLAB X v4.15
XC8 v1.45
MCC v3.55.1
MPLAB Xpress PIC18F46K42 Evaluation board

Thanks for any word on this.