基于STM32F103系列芯片使用IIC协议来写oled(硬件IIC)

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前言

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一、IIC协议是什么？

IIC,即I²C，全称 Inter-Integrated Circuit，字面上的意思是集成电路之间，它其实是I²C Bus简称，所以中文应该叫 集成电路总线 ，它是一种串行通信总线，使用多主从架构，由飞利浦公司在1980年代为了让主板、嵌入式系统或手机用以连接低速周边设备而发展。（百度百科）

 

main.c

代码如下（示例）：

2.读入数据

#include "stm32f10x.h"
#include "usart.h"
#include "Delay.h"
#include <stdio.h>
#include "led.h"
#include "systick.h"
#include "HC_SR04.h"
#include "motor.h"
#include "oled.h"


int main()
{	
	unsigned int i;
	I2C_Configuration();//I2C初始化
	Oled_Iint();//产家给的OLED初始化代码
	ms_Delay(2000);
	Oled_Fill(0xff);//屏幕点亮
	ms_Delay(2000);
	Oled_Fill(0x00);//全屏灭
	ms_Delay(2000);
	OLED_ShowStr(0,3,"LZG",1);
	OLED_ShowStr(0,4,"Hello world",2);
	while(1)
	{
		for(i=0;i<3;i++)
		{
			OLED_ShowCN(22+16*i,0,i);
		}
	}
}

oled.c

代码如下（示例）：

#include "oled.h"
#include "stm32f10x.h"
#include "Delay.h"
#include "codetab.h"
void I2C_Configuration(void)
{
	I2C_InitTypeDef I2C_InitStructure;//I2C结构体
	GPIO_InitTypeDef GPIO_InitSructure;//GPIO结构体
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
	//PB6 SCL  PB7 SDA
	GPIO_InitSructure.GPIO_Mode= GPIO_Mode_AF_OD;
	GPIO_InitSructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
	GPIO_InitSructure.GPIO_Speed= GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitSructure);
	
	//IC2
	I2C_DeInit(I2C1);
	I2C_InitStructure.I2C_Ack        = I2C_Ack_Enable;	//应答使能
	I2C_InitStructure.I2C_AcknowledgedAddress= I2C_AcknowledgedAddress_7bit;//配置指定地址长度为7位
	I2C_InitStructure.I2C_ClockSpeed = 400000;//配置时钟速度为400kbit/s
	I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2 ;//配置占空比为2:1
	I2C_InitStructure.I2C_Mode      = I2C_Mode_I2C;//配置为I2C模式
	I2C_InitStructure.I2C_OwnAddress1= 0X30;//配置自身设备地址，可以随便配
	I2C_Init(I2C1, &I2C_InitStructure);
	I2C_Cmd(I2C1, ENABLE);
	
}
void I2C_WriteByte(uint8_t address,uint8_t data)
{
	while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));//检查I2C总线是否繁忙
	I2C_GenerateSTART(I2C1,ENABLE);								//开启I2C1总线
	while( !I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));//EV5主模式
	I2C_Send7bitAddress(I2C1,OLED_ADDRESS,I2C_Direction_Transmitter);//发送器件地址
	while( !I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ));//EV6
	I2C_SendData(I2C1 , address);//寄存器地址
	while( !I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTING));//EV8
	I2C_SendData(I2C1 , data);//发送数据
	while( !I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTING));//EV8
	I2C_GenerateSTOP(I2C1, ENABLE);//关闭I2C总线

}
//写命令
void WriteCmd(unsigned char I2C_Command)
{
	I2C_WriteByte(0x00,I2C_Command);
}
//写数据
void WriteDat(unsigned char I2C_data)
{
	I2C_WriteByte(0x40,I2C_data);
}

//OLED屏幕初始化
void Oled_Iint()
{
	Delay(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); //调节亮度，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

}
//设置起点坐标
void Oled_SetPos(unsigned char x,unsigned char y)
{
	
	WriteCmd(0xb0 +y);//页地址 
	WriteCmd((x&0xf0)>>4|0x10);//列高地址
	WriteCmd((x&0x0f)|0x01);//列低地址
		
}
//全屏填充
void Oled_Fill(unsigned char Fill_Data)
{
	unsigned char m,n;
	for(m=0;m<8;m++)
	{
		WriteCmd(0xb0+m);
		WriteCmd(0x00);
		WriteCmd(0x10);
		
		for(n=0;n<128;n++)
		{
			WriteDat(Fill_Data);
		}
	}
	
}
//清屏
void Oled_CLS(void)
{
	Oled_Fill(0x00);
}

//OLED打开
void Oled_ON(void)
{
	WriteCmd(0x8D);//设置电荷泵
	WriteCmd(0x14);//开启电荷泵
	WriteCmd(0xAF);//设置显示开
	
}
//OLED关闭
void OLED_OFF(void)
{
  WriteCmd(0x8D);//开启电荷泵
	WriteCmd(0x13);//关闭电荷泵
	WriteCmd(0xAE);//设置显示关
}
//显示字符串
void OLED_ShowStr(unsigned char x,unsigned char y,unsigned char ch[],unsigned char TextSize)
{
	unsigned char c=0,i=0,j=0;
	switch(TextSize)
	{
		case 1://8*6
		{	while(ch[j]!='\0')
			{
				c=ch[j]-32;
				if(x>122)
				{
					x=0;
					y++;
				}
				Oled_SetPos(x,y);
				for(i=0;i<6;i++)
				{
					WriteDat( F6x8[c][i] );
				}
				x+=6;
				j++;
			}
	}break;
		case 2://16*8
		{
			while(ch[j]!='\0')
			{
				c=ch[j]-32;
				if(x>120)
				{
					x=0;
					y++;
				}
				Oled_SetPos(x,y);
				for(i=0;i<8;i++)
				{
					WriteDat( F8X16[c*16+i] );
				}
				Oled_SetPos(x,y+1);
				for(i=0;i<8;i++)
				{
					WriteDat( F8X16[c*16+i+8] );
				}
				x+=8;
				j++;
			}
		}
}
}
//显示中文,想要显示什么汉字，要用取模软件生成，放在codetab.h文件里
void OLED_ShowCN(unsigned char x,unsigned char y,unsigned char N)//N表示第几个汉字
{
	unsigned char wm=0;
	unsigned int addr=32*N;//一个汉字有32个Byte
	Oled_SetPos(x,y);
	
	for(wm=0;wm<16;wm++)
	{
			WriteDat(HZ1F16X16[addr]);
	  	addr++;
	}
	Oled_SetPos(x,y+1);
	for(wm=0;wm<16;wm++)
	{
		WriteDat( HZ1F16X16[addr]);
		addr++;
	}
}
//显示图片
void OLED_DrawBMP(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char BMP[])
{
	unsigned int j=0;
	unsigned char x,y;
	if(y1%8==0)
	{
		y=y1/8;
	}
	else
	{
		y=y1/8+1;
	}
	for(y=y0;y<y1;y++)
	{
		Oled_SetPos(x0,y0);
		for(x=x0;x<x1;x++)
		{
			WriteDat(BMP[j]);
			j++;
		}
	}
}

oled.h

#ifndef _OLED_H_
#define _OLED_H_

#include "stm32f10x.h"
void I2C_Configuration(void);
void I2C_WriteByte(uint8_t address,uint8_t data);
void Writecmd(unsigned char I2C_Command);
void WriteDat(unsigned char I2C_data);
void Oled_Iint();
void Oled_SetPos(unsigned char x,unsigned char y);
void Oled_Fill(unsigned char Fill_Data);
void OLED_ShowStr(unsigned char x,unsigned char y,unsigned char ch[],unsigned char TextSize);
void OLED_ShowCN(unsigned char x,unsigned char y,unsigned char N);
void OLED_DrawBMP(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char BMP[]);
#define OLED_ADDRESS 0x78

#endif

总结

注意字符和中文，要用取模软件进行取模，图形也要用相对于的取模软件取模，oled显示屏是八页，128列，其中每页又有8行，要注意向oled写入数据，是一竖一竖写，一竖就是一个byte，写完一竖自动跳转至下一竖开始写