f4最小系统板，iic驱动四线oled的问题

xiaoa · 发表于 2021-7-5 18:09:42

我用原子的f4zgt6的最小系统做的，iic驱动四线的oled但是不知道为啥Oled没反应，希望有人帮我看看，谢谢！

上代码：

/******************  iic.h  *********************/
#ifndef _IIC_H
#define _IIC_H

#include "stm32f4xx.h"
#include "mydelay.h"

#define SCL          GPIO_Pin_7
#define SDA          GPIO_Pin_9
#define GPIO_IIC    GPIOC

#define SCL_H()       GPIO_SetBits(GPIO_IIC, SCL)
#define SCL_L()       GPIO_ResetBits(GPIO_IIC, SCL)
#define SDA_H()       GPIO_SetBits(GPIO_IIC, SDA)
#define SDA_L()       GPIO_ResetBits(GPIO_IIC, SDA)
#define ReadSDA() GPIO_ReadInputDataBit(GPIO_IIC, SDA)

typedef enum{false,true}bool;

void I2C_IO_Init(void);
void Start(void);
void Stop(void);
void Write(u8 addr, u8 *cmd, u8 len);
//u8 ReadByte(u8 ack);

#endif

/******************  iic.c  *********************/
#include "iic.h"

void I2C_IO_Init()
{
GPIO_InitTypeDef GpioIniture;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

GpioIniture.GPIO_Mode = GPIO_Mode_OUT;
GpioIniture.GPIO_OType = GPIO_OType_OD;
GpioIniture.GPIO_Pin = SCL | SDA;
GpioIniture.GPIO_PuPd = GPIO_PuPd_UP;
GpioIniture.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIO_IIC, &GpioIniture);
}

void Start()
{
SCL_H();
SDA_H();
delay_us(5);
SDA_L();
delay_us(5);
SCL_L();
}

void Stop()
{
SDA_L();
SCL_L();
delay_us(5);
SCL_H();
delay_us(5);
SDA_H();
delay_us(5);
}

bool WaitAck()
{
bool re;
SDA_H();
delay_us(5);
SCL_H();
delay_us(5);
if(ReadSDA())
      re = true;//非应答
else
      re = false;//应答
SCL_L();
delay_us(5);
return re;
}

void WriteByte(u8 byte)
{
u8 i;
for(i = 0; i < 8; i ++)
{
      SCL_L();
      if((byte & 0x80) >> 7)
         SDA_H();
      else
         SDA_L();
      delay_us(2);
      SCL_H();
      byte <<= 1;
}
SCL_L();
SDA_H();
}

/*****************写数据函数*********************
先发送地址，再发送一组数据，cmd为一组数据
的地址，len为数据的个数
***********************************************/
void Write(u8 addr, u8 *cmd, u8 len)
{
u8 i;
Start();
WriteByte(addr);
if(WaitAck())
      return;
for(i = 0; i < len; i ++){
      WriteByte(cmd[i]);
      if(WaitAck())
         return;
}
Stop();
}

/******************  oled.c  *********************/
//oled.c里面的函数太多，我就只贴出来几个重要的函数了
#include "oled.h"
#include "oledfont.h"

/********写命令********/

void WriteCom(u8 IIC_Command)
{
u8 com[] = {0x00};
Write(0x78, com, 1);
Write(0x78, &IIC_Command, 1);//地址为0x78
}

/********写数据********/
void WriteDat(u8 IIC_Data)
{
u8 com[] = {0x40};
Write(0x78, com, 1);
Write(0x78, &IIC_Data, 1);//地址为0x78
}

/********向oled写入指令********/
void OLED_WR_Byte(unsigned dat,unsigned cmd)
{
if(cmd)
      WriteDat(dat);
else
      WriteCom(dat);
}

/********初始化oled********/
void OLED_Init(void)
{
delay_ms(200);

OLED_WR_Byte(0xAE,OLED_CMD);//--display off
OLED_WR_Byte(0x00,OLED_CMD);//---set low column address
OLED_WR_Byte(0x10,OLED_CMD);//---set high column address
OLED_WR_Byte(0x40,OLED_CMD);//--set start line address
OLED_WR_Byte(0xB0,OLED_CMD);//--set page address
OLED_WR_Byte(0x81,OLED_CMD); // contract control
OLED_WR_Byte(0xFF,OLED_CMD);//--128
OLED_WR_Byte(0xA1,OLED_CMD);//set segment remap
OLED_WR_Byte(0xA6,OLED_CMD);//--normal / reverse
OLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)
OLED_WR_Byte(0x3F,OLED_CMD);//--1/32 duty
OLED_WR_Byte(0xC8,OLED_CMD);//Com scan direction
OLED_WR_Byte(0xd3,OLED_CMD);//-set display offset
OLED_WR_Byte(0x00,OLED_CMD);//

OLED_WR_Byte(0xD5,OLED_CMD);//set osc division
OLED_WR_Byte(0x80,OLED_CMD);//

OLED_WR_Byte(0xD8,OLED_CMD);//set area color mode off
OLED_WR_Byte(0x05,OLED_CMD);//

OLED_WR_Byte(0xD9,OLED_CMD);//Set Pre-Charge Period
OLED_WR_Byte(0xF1,OLED_CMD);//

OLED_WR_Byte(0xDA,OLED_CMD);//set com pin configuartion
OLED_WR_Byte(0x12,OLED_CMD);//

OLED_WR_Byte(0xDB,OLED_CMD);//set Vcomh
OLED_WR_Byte(0x30,OLED_CMD);//

OLED_WR_Byte(0x8D,OLED_CMD);//set charge pump enable
OLED_WR_Byte(0x14,OLED_CMD);//

OLED_WR_Byte(0xAF,OLED_CMD);//--turn on oled panel
}