PIC18F26K42上的I2C Master任何人都可以使用它吗？

HI到ALI正在尝试为PIC 18F56K42实现I2C主控。MPLAB IDX 4.10和XC8 1.45硬件配置为内部OSC 64 MHz，I2C具有MimtoSc I2C时钟频率为500 kHz，FSCK＝125kHz，上拉电阻为4.7K。连接到总线上的是MC23017和一个EEPROM AT24C02。我已经实现了TB3159的解决方案（例3），但是它不工作，因为当I2C2CON2＆L:ADB＆GT＝0（启用地址缓冲区）数据表页567时，您必须设置开始位来启动通信。我把这个代码行添加到下面的代码中：EEPROM地址是0B10100000，ADRYRG＝0B000 000 101，数据＝0B00 100101。范围信号是：I2C Wr.JPG和I2C写ZOM.JPG.三个“尖峰”是来自EEPROM从机的ACK＝0。这些尖峰是奇怪的，但它的工作。读取代码是：见附件的范围信号：I2CRADAD.JPG-读代码停止工作在指令“”（）！I2C1STAT1BIT.RXBF）；“我检查寄存器I2C1STAT1＆LT；RXBF＆GT；和PIR5& LT；RXBF & GT；并且两者都是零，如果我已经收到有效数据。寄存器I2C2RXB有一个有效的数据。范围也显示了数据接收任何人知道我可以解决这个问题！提前感谢，最好的挽回



      以下为原文

    hi to all

I'm trying to implement a I2C master for the PIC 18F56K42. MPLAB IDE X 4.10  and XC8 1.45.

The hardware configuration is Internal OSC 64MHz, I2c with MFINTOSC I2C clock frequency 500kHz and fsck=125kHz and the pull up resistors are 4.7k. Connected to the bus I have MCP23017 and one eeprom AT24c02.

I have implemented the solution (example 3) of TB3159, but it doesn't work because you have to set START bit to start the communication when I2C2CON2 = 0 (address buffers are enabled) datasheet page 567. I added this code line and see below my code:

void I2C2_Initialize(void)
{
    GIE = 0;
   
    PPSLOCK = 0x55;
    PPSLOCK = 0xAA;
    PPSLOCKbits.PPSLOCKED = 0x00; // unlock PPS
   
    I2C2SDAPPSbits.I2C2SDAPPS = 0x19;   //RD1->I2C2:SDA2;        //11 001
    RD1PPS = 0x24;   //RD1->I2C2:SDA2;
    I2C2SCLPPSbits.I2C2SCLPPS = 0x18;   //RD0->I2C2:SCL2;        11 000
    RD0PPS = 0x23;   //RD0->I2C2:SCL2;
        
    PPSLOCK = 0x55;
    PPSLOCK = 0xAA;
    PPSLOCKbits.PPSLOCKED = 0x01; // lock PPS
   
    LATD = 0;
    PORTD = 0;
    TRISD = 0b00001000;   
    ANSELD = 0x00;
    ODCOND = 0b00000011;    //RD0 e RD1 OD per I2C2 bus
   
    SLRCOND = 0b11111100;
            
    // Set the I2C levels
    RD0I2Cbits.TH = 1;
      RD1I2Cbits.TH = 1;
   
    RD0I2Cbits.SLEW = 1;
       RD1I2Cbits.SLEW = 1;
     
                    // -- -- -- -- CLK<3:0> // CLK MFINTOSC;
    I2C2CLK = 0x03; // 0 0 0 0 0 0 1 1
                                 // EN RSEN S CSTR MDR MODE<2:0>
    I2C2CON0 = 0x04; // 0 0 0 0 0 1 0 0
                                // ACKCNT ACKDT ACKSTAT ACKT -- RXOV TXU CSD
    I2C2CON1 = 0x80;// 1 0 0 0 0 0 0 0
                        // ACNT GCEN FME ADB* SDAHT<3:2> BFRET<1:0>
    I2C2CON2 = 0x21; // 0 0 1 0 0 0 0 1
    I2C2PIR = 0;// ;Clear all the error flags
    I2C2ERR = 0;
    I2C2CON0bits.EN = 1; // enable I2C module
}

void i2c2_write1ByteRegister(uint8_t address, uint8_t adr_reg, uint8_t data)
{
    I2C2ADB1 = address; //The address byte has 8th bit to 0
    I2C2CNT = 2;
    I2C2CON0bits.S = 1; //Start Bit
   
    I2C2TXB = adr_reg;
    while(!I2C2STAT1bits.TXBE); //Wait butter empty
   
    I2C2TXB = data;
    while(!I2C2STAT1bits.TXBE);
   
    while(!I2C2PIRbits.PCIF); //Wait stop condition
   
    ClrWdt();
}

the EEPROM address is 0b10100000, adr_reg = 0b00000101, data = 0b00100101
the scope signals are : I2C write.jpg and i2C write zoom.jpg


the three "spikes" are the ACK=0 from EEPROM slave. These spikes are strange but it works.


the read code is:

uint8_t i2c2_read1ByteRegister(uint8_t address, uint8_t adr_reg)
{
    uint8_t result;
        
        I2C2ADB1 = address;
    I2C2CNT = 1;
    I2C2CON0bits.S = 1; //Start
    I2C2CON0bits.RSEN = 1;
       I2C2TXB = adr_reg;
    while(!I2C2STAT1bits.TXBE);
    while(!I2C2CON0bits.MDR);
    I2C2CNT = 1;
    I2C2CON0bits.RSEN = 0;   
    I2C2ADB1 = (address| 0x01); //Change the R/W bit for read
    I2C2CON0bits.S = 1; //Start
     
    while (!I2C1STAT1bits.RXBF);
        result = I2C1RXB;
   
    while(!I2C2PIRbits.PCIF);   ///WAIT STOP
    return result;
}


See attached the scope signals: I2Cread.jpg

the read code stop to work at the instruction" while (!I2C1STAT1bits.RXBF);"

I check the registers I2C1STAT1 and PIR5 and both are zero also if I have received a valid data. The register I2C2RXB has a valid datum. Also the scope shows the datum received

Anyone know I can solve this problem !

Thanks in advance and best reagrds

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