请问28335的I2C模块，在与从器件连接时，会从SCL引脚输出时钟信号么？

只看该作者 · 2014-9-9 11:06

我用开发板给的EEPROM的例程，可是在SCL引脚检测不到时钟信号

只看该作者 · 2014-9-9 11:19

应该会的，肯定哪儿出问题了

只看该作者 · 2014-9-9 15:12

SCL信号必须在CS 之后

只看该作者 · 2014-9-9 15:23

那请大神帮忙看一下，这是开发板给的配套例程，存在什么问题呢
#include "DSP2833x_Device.h"    // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File

void InitI2C(void);
Uint16       ReadData(Uint16  *RamAddr, Uint16 RomAddress, Uint16 number);
Uint16       WriteData(Uint16 *Wdata, Uint16 RomAddress, Uint16 number);

Uint16       I2C_xrdy();
Uint16       I2C_rrdy();

Uint16  i;

      Uint16 dat1[8]={0,0,0,0,0,0,0,0};
      Uint16 dat[]={ 0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88};

void main(void)
{
InitSysCtrl();
// InitGpio();  // Skipped for this example
InitXintf16Gpio();
InitI2CGpio();
InitI2C();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
//LedReg = 0xFF;

WriteData(dat,0x60,8);
DELAY_US(10000);
ReadData(dat1,0x60,8);

for(; ;)
{

}

}

Uint16 WriteData(Uint16       *Wdata, Uint16       RomAddress, Uint16 number)
{
Uint16 i;
if (I2caRegs.I2CSTR.bit.BB == 1)
{
   return I2C_BUS_BUSY_ERROR;
}
while(!I2C_xrdy());
I2caRegs.I2CSAR = 0x50;
I2caRegs.I2CCNT = number + 1;
I2caRegs.I2CDXR = RomAddress;
I2caRegs.I2CMDR.all = 0x6E20;
for (i=0; i<number; i++)
{
   while(!I2C_xrdy());
   I2caRegs.I2CDXR = *Wdata;
   Wdata++;
      if (I2caRegs.I2CSTR.bit.NACK == 1)
                  return       I2C_BUS_BUSY_ERROR;
}
return I2C_SUCCESS;
}

Uint16 ReadData(Uint16  *RamAddr, Uint16 RomAddress, Uint16 number)
{
Uint16  i,Temp;

if (I2caRegs.I2CSTR.bit.BB == 1)
{
   return I2C_BUS_BUSY_ERROR;
}
while(!I2C_xrdy());
I2caRegs.I2CSAR = 0x50;
I2caRegs.I2CCNT = 1;
I2caRegs.I2CDXR = RomAddress;
I2caRegs.I2CMDR.all = 0x6620;
if (I2caRegs.I2CSTR.bit.NACK == 1)
               return       I2C_BUS_BUSY_ERROR;
DELAY_US(50);
while(!I2C_xrdy());
I2caRegs.I2CSAR = 0x50;
I2caRegs.I2CCNT = number;
I2caRegs.I2CMDR.all = 0x6C20;
if (I2caRegs.I2CSTR.bit.NACK == 1)
               return       I2C_BUS_BUSY_ERROR;
for(i=0;i<number;i++)
{
   while(!I2C_rrdy());
         Temp = I2caRegs.I2CDRR;
      if (I2caRegs.I2CSTR.bit.NACK == 1)
                  return       I2C_BUS_BUSY_ERROR;
         *RamAddr = Temp;
         RamAddr++;
}
return I2C_SUCCESS;
}

Uint16       I2C_xrdy()
{
      Uint16       t;
      t = I2caRegs.I2CSTR.bit.XRDY;
      return t;
}

Uint16       I2C_rrdy()
{
      Uint16       t;
      t = I2caRegs.I2CSTR.bit.RRDY;
      return t;
}