求助，stm32模拟iic控制oled 失败。。。

#include "led.h"
#include "stm32f10x.h"
#include "delay.h"
#include "sys.h"
//////////////////////////////////////////////////////////////////////////////////
/** I2C ???? */
#define I2C_PORT GPIOB
#define SDA_Pin GPIO_Pin_7
#define SCL_Pin GPIO_Pin_6

#define FAILURE 0
#define SUCCESS 1

u32 TimingDelay = 0;

void Delay_Ms(u32 nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0);
}

//I2C³õÊ¼»¯
void i2c_init()
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

GPIO_InitStructure.GPIO_Pin = SDA_Pin | SCL_Pin;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;    // //I2C±ØÐë¿ªÂ©Êä³ö

   GPIO_Init(I2C_PORT, &GPIO_InitStructure);

}
//ÅäÖÃSDAÎªÊäÈëÄ£Ê½
void SDA_Input_Mode()
{
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = SDA_Pin;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU ;//GPIO_Mode_IPU

   GPIO_Init(I2C_PORT, &GPIO_InitStructure);
}
//ÅäÖÃSDAÎªÊä³öÄ£Ê½
void SDA_Output_Mode()
{
GPIO_InitTypeDef GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = SDA_Pin;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;//GPIO_Mode_AF_OD

   GPIO_Init(I2C_PORT, &GPIO_InitStructure);
}

//
void SDA_Output( uint16_t val )
{
if ( val ) {
      GPIO_SetBits(I2C_PORT,SDA_Pin);
} else {
      GPIO_ResetBits(I2C_PORT,SDA_Pin);
}
}

//
void SCL_Output( uint16_t val )
{
if ( val ) {
      GPIO_SetBits(I2C_PORT,SCL_Pin);
} else {
      GPIO_ResetBits(I2C_PORT,SCL_Pin);
}
}

//
uint8_t SDA_Input()
{
return GPIO_ReadInputDataBit( I2C_PORT, SDA_Pin);
}

//????
void delay1(unsigned int n)
{
unsigned int i;
for ( i=0;i<n;++i);
}

//I2C×ÜÏßÆô¶¯
void I2CStart(void)
{
SDA_Output(1);delay1(500);
SCL_Output(1);delay1(500);
SDA_Output(0);delay1(500);
SCL_Output(0);delay1(500);
}

//I2C×ÜÏßÍ£Ö¹
void I2CStop(void)
{
SCL_Output(0); delay1(500);
SDA_Output(0); delay1(500);
SCL_Output(1); delay1(500);
SDA_Output(1); delay1(500);

}

//µÈ´ýÓ¦´ð
unsigned char I2CWaitAck(void)
{
unsigned short cErrTime = 5;
SDA_Input_Mode();
delay1(500);
SCL_Output(1);delay1(500);
while(SDA_Input())
{
      cErrTime--;
      delay1(500);
      if (0 == cErrTime)
      {
         SDA_Output_Mode();
         I2CStop();
         return FAILURE;
      }
}
SDA_Output_Mode();
SCL_Output(0);delay1(500);
return SUCCESS;
}

//·¢ËÍÓ¦´ðÎ»
void I2CSendAck(void)
{
SDA_Output(0);delay1(500);
delay1(500);
SCL_Output(1); delay1(500);
SCL_Output(0); delay1(500);

}

//
void I2CSendNotAck(void)
{
SDA_Output(1);
delay1(500);
SCL_Output(1); delay1(500);
SCL_Output(0); delay1(500);

}

//Í¨¹ýI2C×ÜÏß·¢ËÍÒ»¸ö×Ö½ÚÊý¾Ý
void I2CSendByte(unsigned char cSendByte)
{
unsigned char  i = 8;
while (i--)
{
      SCL_Output(0);delay1(500);
      SDA_Output(cSendByte & 0x80); delay1(500);
      cSendByte += cSendByte;
      delay1(500);
      SCL_Output(1);delay1(500);
}
SCL_Output(0);delay1(500);
}

//Í¨¹ýI2C×ÜÏß½ÓÊÕÒ»¸ö×Ö½ÚÊý¾Ý
unsigned char I2CReceiveByte(void)
{
unsigned char i = 8;
unsigned char cR_Byte = 0;
SDA_Input_Mode();
while (i--)
{
      cR_Byte += cR_Byte;
      SCL_Output(0);delay1(500);
      delay1(500);
      SCL_Output(1);delay1(500);
      cR_Byte |=  SDA_Input();
}
SCL_Output(0);delay1(500);
SDA_Output_Mode();
return cR_Byte;
}

void WriteCmd(u8 data)//EEPROM_Wirte(0x0B);
{ /***Ð´Èë***/
  I2CStart();          //¿ªÊ¼
  I2CSendByte(0x76); //oled µØÖ·
  I2CSendAck();
  I2CSendByte(0x00);       //·¢ËÍ
  I2CSendAck();
  I2CSendByte(data);    //Ð´Èë
  I2CSendAck();
  I2CStop();             //Í£Ö¹
  Delay_Ms(10);//µÈ´ý
}
//Random Read
u8 WriteDat(u8 add)  //EEPROM_Read(i);

{ /***??***/
  u8 a;
  I2CStart();          //¿ªÊ¼
  I2CSendByte(0x78); //´Ó´ËµØÖ·¿ªÊ¼¶ÁÊý¾Ý
  I2CSendAck();
I2CSendByte(0x40);
   I2CSendAck();
  I2CSendByte(add);       //Ð´ÈëACK
  I2CSendAck();
  I2CStop();             //Í£Ö¹
//  I2CStart();
//  I2CSendByte(0xA1);    //ÏÂÒ»¸öµØÖ·
//  I2CSendAck();
//  a=I2CReceiveByte();    //½ÓÊÕÊý¾Ý£¬±£´æÓÚa
//  I2CSendNotAck();
//  I2CStop();             //Í£Ö¹
//  return a;
}

void OLED_Init(void)
{
delay_ms(100); //????????

WriteCmd(0xAE); //display off
WriteCmd(0x20); //Set Memory Addressing Mode
WriteCmd(0x10); //00,Horizontal Addressing Mode;01,Vertical Addressing Mode;10,Page Addressing Mode (RESET);11,Invalid
WriteCmd(0xb0); //Set Page Start Address for Page Addressing Mode,0-7
WriteCmd(0xc8); //Set COM Output Scan Direction
WriteCmd(0x00); //---set low column address
WriteCmd(0x10); //---set high column address
WriteCmd(0x40); //--set start line address
WriteCmd(0x81); //--set contrast control register
WriteCmd(0xff); //???? 0x00~0xff
WriteCmd(0xa1); //--set segment re-map 0 to 127
WriteCmd(0xa6); //--set normal display
WriteCmd(0xa8); //--set multiplex ratio(1 to 64)
WriteCmd(0x3F); //
WriteCmd(0xa4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
WriteCmd(0xd3); //-set display offset
WriteCmd(0x00); //-not offset
WriteCmd(0xd5); //--set display clock divide ratio/oscillator frequency
WriteCmd(0xf0); //--set divide ratio
WriteCmd(0xd9); //--set pre-charge period
WriteCmd(0x22); //
WriteCmd(0xda); //--set com pins hardware configuration
WriteCmd(0x12);
WriteCmd(0xdb); //--set vcomh
WriteCmd(0x20); //0x20,0.77xVcc
WriteCmd(0x8d); //--set DC-DC enable
WriteCmd(0x14); //
WriteCmd(0xaf); //--turn on oled panel
}
void OLED_ON(void)
{
WriteCmd(0X8D);  //?????
WriteCmd(0X14);  //?????
WriteCmd(0XAF);  //OLED??
}

void OLED_SetPos(unsigned char x, unsigned char y) //???????
{
WriteCmd(0xb0+y);
WriteCmd(((x&0xf0)>>4)|0x10);
WriteCmd((x&0x0f)|0x01);
}

void OLED_Fill(unsigned char fill_Data)//????
{
unsigned char m,n;
for(m=0;m<8;m++)
{
      WriteCmd(0xb0+m);    //page0-page1
      WriteCmd(0x00);    //low column start address
      WriteCmd(0x10);    //high column start address
      for(n=0;n<128;n++)
         {
            WriteDat(fill_Data);
         }
}
}

int main(void)
{
delay_init();
LED_Init();
i2c_init();
OLED_Init();
OLED_Fill(0Xff);
while(1)
{

}
}

求助，stm32模拟iic控制oled 失败。。。

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