pic16和gestic之间的I2c通信是否有可用的样本代码？

你能更具体地说“不正确”吗？在另一种情况下，你看到的（或没有看到的）是什么？我做了很多假设，但有可能是从设备不承认它的地址吗？或者地址甚至没有出现在公共汽车上？



      以下为原文

    Can you be more specific about "not correctly"?  what are you seeing (or not seeing) in one case which is different in the other case?
 
I'm making a lot of assumptions, but is it possible that the slave device is not acknowledging its address?  Or does the address not even appear correctly on the bus?

嗨，我的意思是没有确切的信息要写什么数据，因此它没有给出与狗一样的输出，图18。我被要求显示在LCD上传输的数据。但是，因为我不知道数据是什么，所以我不能这样做。可能是地址没有被确认，但我使用的地址是在数据表上为gestIc提供的。以下是示例代码之一：I didextern void lcd_init(void)；extern void lcd_putc(无符号int状态)；extern void I2C_Master_Init()；extern void I2C_Master_Wait()；extern void I2C_Master_Start()；extern void I2C_Master_Restart()；extern void I2C_Master_Stop()；extern void I2C_Master_Write(无符号d)；无符号的字符数据；无效I2C_Master_Master_Init(){SSPSTAT=0；//b100001SSPMSK=0；//b10000101 SSPSTAT=0；//b10000101 SSPMSK=0；SSPCON 0=0b00101SK=0；SSPCON2=0b001010000000000000000000000；SSPCON2=0；SSPADD=0x4f；TRISC比特.TRISC比特.TRISC3=1；TRISC比特.TRISC比特.TRISC4=1；TRISC比特.TRISC4=1；；}无效I2C_MasMasMasMas串串串串串4=1；}I2C_MasMaster_Wait(){{{//传输正在进行中}无效I2C_Master_S{I2C_Master_Wait(){I2C_Master_Master_Wait()；SSP1CON2比特，SSP1CON2比特.SEN=1；}无效I2C_Master_Master_Master_Wait()；SSP1CON2C_I2C_Master_Master_Wait()；SSP1CON2C_Master_Master_Wait()；SSP1CON2C2C_Master_Master_Master_Water_Wait()；SSP1CON2C_I2C_Master_Master_Master_Master_Master_Master_Rest2C_Master_Wait()；SSP1CON2C_2C_IP1CON2C_2C_Master_Master_Master_Master_Master_}int I2C_Master_Read(无符号短a){无符号shOrtTimp；I2CyMistar WAITE（）；SSPCON2BITS RCEN＝1；I2CyMistar WAITE（）；TEMP= SSPBUF；I2C.MistMaWaWET（）；SSPCON2BITS.ACKDT =（a）？0:1；SSPCON2bits.ACKEN=1；返回temp；}vovoidmain(void){OP._REGbits.nWPUEN=0；返回temp；{返回temp;}vovovovoid;{OP._REGbits.void;}void；{OP._REGGGGbits.nWWWPUPU=0；WPUB=1；TRISB=0b11111111111111111111；.//PORTB作为输入TRISD=0b0000000000000000000011；；.//PORTB/PORTB PORTB作为输入TRIRTB=0b00000000000000000000000000000000000000000输入；.//PORTD作为输出(港口)比特.RD2==1) {I2C_Master_Master_Star(){I2C_Master_Star()；//启动条件I2C_Master_Master_Writ(0x42|0x4)；//7位地址+写入数据=I2C_Master_Master_Master_Master_读出(0)；//7位地址+写入数据=I2C_写入数据=I2C_I2C_Master_Master_Master_Master_Master_Wter_写入(0x42|(0x42|0x42|0x42|0x42|0x42|0x42|0x4)；//7位地址+写入+写入+写入数据=Is.BF==1) {I2C_Master_Wait();}.{I2C.Mistalm Stutter（）；} }



      以下为原文

    Hi,
I just mean that there's no information about what exactly the data is to be written, therefore it is not giving the same output as the dongle, pic18. I was asked to display the data transmitted on the LCD . but since I dont know what the data is, I can't do that.
It could be the case that the address in not being acknowledged, but I was using the address that was provided on the datasheet for the gestIc. Here's one of the sample codes I did

extern void lcd_init(void);
extern void lcd_putc(unsigned int status);
 
extern void I2C_Master_Init();
extern void I2C_Master_Wait();
extern void I2C_Master_Start();
extern void I2C_Master_Restart();
extern void I2C_Master_Stop();
extern void I2C_Master_Write(unsigned d);
unsigned char data;
 
void I2C_Master_Init()
{
    SSPSTAT=0;//b10000101
    SSPMSK=0;
    SSPCON=0b00101000;
    SSPCON2=0;
    SSPADD=0x4f;
    TRISCbits.TRISC3=1;
    TRISCbits.TRISC4=1;
}
 
void I2C_Master_Wait()
{
  while ((SSPSTAT & 0b00000100) || (SSPCON2 & 0b00011111)); //Transmit is in progress
}
 
void I2C_Master_Start()
{
  I2C_Master_Wait();
  SSP1CON2bits.SEN = 1;
}
void I2C_Master_Restart()
{
  I2C_Master_Wait();
  SSP1CON2bits.RSEN = 1;
}
void I2C_Master_Stop()
{
  I2C_Master_Wait();
  SSP1CON2bits.PEN = 1;
}
void I2C_Master_Write(unsigned d)
{
  I2C_Master_Wait();
   SSPBUF = d;
}
int I2C_Master_Read(unsigned short a)
{
  unsigned short temp;
  I2C_Master_Wait();
  SSPCON2bits.RCEN = 1;
  I2C_Master_Wait();
  temp = SSPBUF;
  I2C_Master_Wait();
  SSPCON2bits.ACKDT = (a)?0:1;
  SSPCON2bits.ACKEN = 1;
  return temp;
}
 
 
 
void main(void)
{
  OPTION_REGbits.nWPUEN=0;
  WPUB=1;
  TRISB = 0b11111111;                 //PORTB as input
  TRISD = 0b00000000;                 //PORTD as output
  PORTD = 0b00000000;
 
   I2C_Master_Init(100000);      //Initialize I2C Master with 100KHz clock
 
   TRISDbits.TRISD2=1;
   if(PORTDbits.RD2==1)
   {
    I2C_Master_Start();         //Start condition
    I2C_Master_Write(0x42|0x4);     //7 bit address + Write
   
    data=I2C_Master_Read(0);
 
    
    if(SSPMSK==1)
     {
         I2C_Master_Read(0);
     }
    I2C_Master_Wait();
    PORTD =I2C_Master_Read(0);
    if(SSPSTATbits.BF==1)
    {
        
       I2C_Master_Wait();
    }
    else
    {
        
        I2C_Master_Stop();
    }
   }
    
  
 
 
 
}
 

你有一个嗅觉仪来观察这些线吗？I2C.MistMrimeWrror（0x42×0x4）；// 7位地址+ Wrad，这是什么？地址是什么？你没有检查是否收到ACK。



      以下为原文

    Do you have an osiliscope to look at the lines with?
I2C_Master_Write(0x42|0x4); //7 bit address + Write
What is this ? What is the address?
And you are not checking if you received an ack.

是的，对于数据线，它显示高-低-高-低-高-低（3次）n，然后在220uS左右保持高，然后返回并重复。对于时钟，它会显示低高12次，对于24个用户会保持高电平，然后重复，但是在某些地方也会有点不规则。gestIc芯片的地址是0x42，0x4只是将其设置为sspxstat寄存器中的读模式。确认包括D在读取函数中。



      以下为原文

    Yes for the data line it was showing high-low-high-low-high-low(3 times) n then remains high for around 220uS then goes back down and repeats.  
And for the clock, it would show high-low-high like 12 times and would remain high for like 24us and then repeats, but it would be a bit irregular at places too.
The address of the gestIc chip is 0x42 and 0x4 is just setting it to read mode in the sspxstat register.
The acknowledgement has been included in the read function.
 

你有使用其他I2C设备比如EEPROM的经验吗？此外，这看起来是错误的，如果你想读，那么它需要一个有0位的读地址。I2CyMaskSistar（）；/开始条件I2C.MistMrimeWrror（0x42×0x4）；// 7位地址+写数据＝I2C.MistMauleRead（0）；



      以下为原文

    Do you have experience of using other I2C devices such as EEPROMS?
 
Also this looks wrong, if you want to read then it needs a read address which would have bit 0 set.
 
    I2C_Master_Start();         //Start condition
    I2C_Master_Write(0x42|0x4);     //7 bit address + Write
   
    data=I2C_Master_Read(0);

不，我以前没有和其他I2CS一起工作过。那么红色的地址是什么呢？它和写地址一样吗？



      以下为原文

    No i haven't worked with any other i2cs before.
What would the red address be then?
Is it the same as the write address?

假设地址是0x42/0x42×0x01



      以下为原文

    Assuming the address is 0x42:
0x42 | 0x01

那是读还是写呢？还是两者兼而有之？



      以下为原文

    so is that for REad or write or both?

读0x42×0x01写0x42



      以下为原文

    Read 0x42 | 0x01
write 0x42

I2CJMistMulk（）函数是否芳香地移动给定的地址？如果不是，那么地址值应该是0x84.这个线程不应该在I2C论坛吗？



      以下为原文

    Does the I2C_Master_Write() function aromatically shift the given address?
 
If not then the address value should be 0x84.
 
 
And shouldn't this thread be in the I2C forum?

可能这一点从来没有明确定义过。更多的理由去看看ACKs



      以下为原文

   
Possibly This Point is  never defined clearly.  All the more reason to see what ACKs

给定地址的含义是什么？



      以下为原文

    what does aromatically shift the given address mean?
 

为了更清晰，基本上，我希望主照明com板(PIC16f1947)用mgc3130芯片从gestIc板接收手势，并将结果显示在主显示器的液晶屏幕上。有没有关于如何实现I2C总线的一部分呢？其余的我可以管理



      以下为原文

    Just to be more clear, basically, I want the master, lighting com board(PIC16f1947) to receive gestures from the the gestIc board with an mgc3130 chip and display the result on the lcd screen in the master. Any examples on how to implement the i2c bus part of it? the rest i can manage

FWWW似乎有示例代码下载，虽然它可能是其他PIC系列。如果示例代码是针对PIC18系列设备，那么它可能值得在PIC18上实现，或者在您自己的板上还是在评估工具箱上？关于I2C寻址，在地址如何编写方面存在一个不幸的分裂。据我所知，（旧）官方的方式是地址字节被分成7位地址字段占用位7-1和1位方向（R/W）字段占用位0。这意味着要实际发送一个地址，您需要将其左移以便添加方向位。通常的做法是将地址常数写为预乘的8位值，以便通过一个“OR”操作添加方向位，编辑：尽管可能有例外。我还要补充一点，我最近读到的NXP数据表使用了预乘格式。I2C_Master_Write()不会自动移位地址，因为它是一般写入（也用于数据）。格式化地址取决于你。



      以下为原文

    FWIW there seemed to be example code to download, though it may have been for other PIC series. If the example code is for a PIC18 series device then it may be worth implementing a PIC18, either on your own board or an evaluation kit?
 
Regarding I2C addressing there is an unfortunate split in how addresses can be written. As I understand it the (old) Official way is that the address byte is split into a 7 bit address field occupying bits 7-1 and a 1 bit direction (R/W) field occupying bit 0. This means that to actually transmit an address you need to shift it left in order to add the direction bit.
 
Common practice is to write the address constants as pre-multiplied 8 bit values so the direction bit can be added with one "OR" operation, edit: though there may be exceptions. I would add that the NXP datasheet I read recently used the pre-multiplied format.
 
I2C_Master_Write() will not automatically shift the address as it is a generic write (used for data as well). It is up to you to format the address.
 
 

如果地址有气味，它会移动它……Lodiac！！！！！！！！！！



      以下为原文

   
If the address smells right it will shift it.....lol
 
DYAC!!!!!!!

谢谢，我们如何检查通信是否工作？除了数据、时钟、VDD和接地端口之外，还有其他端口可以连接吗？



      以下为原文

    Thank you
How do we check if the communication works or not? And is there any other ports to be connected other than the data, clock, Vdd and ground ports?

您要检查从设备是否确认您所写的每个字节，尤其是地址字节。实际阅读I2C规范是一个好主意。你可以通过维基百科的I2C页面找到它。



      以下为原文

   
You check if the slave acknowledged each byte you write, particularly the address byte.
It would be a good idea to actually read the I2C specification. You can find it via the I2C page in wikipedia.

我们在示波器上检查一下吗？如果地址是0B100100100，那意味着当它是1时波形应该是高的，当它是0时是低的？



      以下为原文

    do we check that on the oscilloscope? 
Like if the address is 0b00100100 does that mean the waveform should be high when it is 1 and low when it is 0? 

有9位。最后是从接收器到发送器的ACK。



      以下为原文

    There are 9 bits.  The Last is the Ack it goes from the receiver to the sender.