参考博客：https://blog.csdn.net/qq_42992084/article/details/89977888
IIC学习： https://blog.csdn.net/u010261063/article/details/114300238
SSD1306 IIC读写时序
1、 第一个字节(Slave Address )发送的是地址 和 读写属性（一般只会写数据）；SA0（D/C引脚就是SA0）决定了从机的地址； 0x78
2、第二个字节（control byte ）决定了第三个字节是命令还是数据
a） Co = 0 代表后边全是数据
b） D/C = 0 代表后边是数据（0x00）；D/C = 0 代表后边是命令；(0x40)
//发送一个字节
//向SSD1306写入一个字节。
//mode:数据/命令标志 0,表示命令;1,表示数据;
void OLED_WR_Byte(u8 dat,u8 mode)
{
I2C_Start();
Send_Byte(0x78);//发送地址和写指令
I2C_WaitAck();
if(mode)
{
Send_Byte(0x40);//发命令
}
else
{
Send_Byte(0x00);//发数据
}
I2C_WaitAck();
Send_Byte(dat);
I2C_WaitAck();
I2C_Stop();
}第一次初始化流程
第二个初始化流程
1、地址设置命令（0x00-0x0F），高4位强制为0
（1）页地址模式下设置列起始地址低4位
（2）页地址模式下设置列起始地址高4位（0x10-ox1F），高4位强制为1
（3）设置内存地址寻址模式(Set Memory Addressing Mode)(20h)
带有参数：02 表示页寻址模式
通常在页地址模式下访问GDDRAM, 需要如下步骤来定义起始RAM访问指针指向:
- 通过命令(B0h-B7h)设置目标显示位置页起始地址
- 通过命令(00h-0Fh)设置列起始地址低位
- 通过命令(10h-1Fh)设置列起始地址高位
void OLED_Init(void)
{
OLED_Config();
OLED_SCK(HIGH); // 空闲态时，SCLK处于高电平
OLED_CS(HIGH); // 关闭选择输入
/* 从上电到下面开始初始化要有足够的时间，即等待 RC复位完毕 */
OLED_RST(LOW); // 复位（低电平有效）
OLED_Delay_ms(100);
OLED_RST(HIGH);
OLED_Delay_ms(30);
/*
//官方的驱动流程
OLED_Write_Cmd(0xA8); // 设置多路传输比率 -- set multiplex ratio (16 to 63)
OLED_Write_Cmd(0x3F); // \ 1 / 64 duty
OLED_Write_Cmd(0xD3); // 设置显示偏移 -- set display offset (0x00~0x3F)
OLED_Write_Cmd(0x00); // \ not offset 偏移值是 0
OLED_Write_Cmd(0x40); // 设置设置屏幕（GDDRAM）起始行 -- Set Display Start Line (0x40~0x7F)
/配置显示方向
OLED_Write_Cmd(0xA1); // 设置段重映射 -- Set SEG / Column Mapping 0xA0左右反置（复位值） 0xA1正常（重映射值）
OLED_Write_Cmd(0xC8); // 设置行输出扫描方向 -- Set COM / Row Scan Direction 0xc0上下反置（复位值） 0xC8正常（重映射值）
OLED_Write_Cmd(0xDA); // 设置列引脚硬件配置 -- set com pins hardware configuration
OLED_Write_Cmd(0x12); // \ Sequential COM pin configuration，Enable COM Left/Right remap
OLED_Write_Cmd(0x81); // 设置对比度 -- set contrast control register (0x00~0x100)
OLED_Write_Cmd(0xCF); // \ Set SEG Output Current Brightness
//根据RAM 内容显示
OLED_Write_Cmd(0xA4); // 全局显示开启(黑屏/亮屏) (0xA4 根据RAM 内容显示 / 0xA5 每个oled都点亮 全部显示)
//正常显示方式（不是反现）
OLED_Write_Cmd(0xA6); // 设置显示方式(正常/反显) -- set normal display (0xA6 / 0xA7)
//设置显示时钟分频因子/振荡器频率
OLED_Write_Cmd(0xD5); // 设置显示时钟分频因子/振荡器频率 -- set display clock divide ratio/oscillator frequency
OLED_Write_Cmd(0x80); // A[3:0] 分频因子, A[7:4] 震荡频率设置 Set Clock as 100 Frames/Sec
OLED_Write_Cmd(0x8D); // 电荷泵设置 -- set Charge Pump enable / disable (0x14 / 0x10)
OLED_Write_Cmd(0x14); // \ 启用电荷泵 Enable charge pump during display on
OLED_Write_Cmd(0xAF); // 打开OLED -- turn on oled panel ： OXAE 关闭OLED 休眠模式 0xaf 打开oled
//官方的驱动流程
*/
OLED_Write_Cmd(0xAE); // 关闭OLED -- turn off oled panel
OLED_Write_Cmd(0xD5); // 设置显示时钟分频因子/振荡器频率 -- set display clock divide ratio/oscillator frequency
OLED_Write_Cmd(0x80); // A[3:0] 分频因子, A[7:4] 震荡频率设置 Set Clock as 100 Frames/Sec
OLED_Write_Cmd(0x20); // 设置内存寻址模式 -- Set Memory Addressing Mode (0x00 / 0x01 / 0x02)
OLED_Write_Cmd(0x02); // \ Page Addressing 设置为页寻址模式
OLED_Write_Cmd(0xA8); // 设置多路传输比率 -- set multiplex ratio (16 to 63)
OLED_Write_Cmd(0x3F); // \ 1 / 64 duty
OLED_Write_Cmd(0xDA); // 设置列引脚硬件配置 -- set com pins hardware configuration
OLED_Write_Cmd(0x12); // \ Sequential COM pin configuration，Enable COM Left/Right remap
/* ----- 方向显示配置 ----- */
OLED_Write_Cmd(0xA1); // 设置段重映射 -- Set SEG / Column Mapping 0xA0左右反置（复位值） 0xA1正常（重映射值）
OLED_Write_Cmd(0xC8); // 设置行输出扫描方向 -- Set COM / Row Scan Direction 0xc0上下反置（复位值） 0xC8正常（重映射值）
/* ----- END ----- */
OLED_Write_Cmd(0x40); // 设置设置屏幕（GDDRAM）起始行 -- Set Display Start Line (0x40~0x7F)
OLED_Write_Cmd(0xD3); // 设置显示偏移 -- set display offset (0x00~0x3F)
OLED_Write_Cmd(0x00); // \ not offset 偏移值是 0
OLED_Write_Cmd(0x81); // 设置对比度 -- set contrast control register (0x00~0x100)
OLED_Write_Cmd(0xCF); // \ Set SEG Output Current Brightness
OLED_Write_Cmd(0xD9); // 设置预充电期间的持续时间 -- set pre-charge period
OLED_Write_Cmd(0xF1); // \ Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
OLED_Write_Cmd(0xDB); // 调整VCOMH调节器的输出 -- set vcomh (0x00 / 0x20 / 0x30)
OLED_Write_Cmd(0x20); // \ Set VCOM Deselect Level
OLED_Write_Cmd(0x8D); // 电荷泵设置 -- set Charge Pump enable / disable (0x14 / 0x10)
OLED_Write_Cmd(0x14); // \ 启用电荷泵 Enable charge pump during display on
OLED_Write_Cmd(0xA4); // 全局显示开启(黑屏/亮屏) (0xA4 根据RAM 内容显示 / 0xA5 每个oled都点亮 全部显示)
OLED_Write_Cmd(0xA6); // 设置显示方式(正常/反显) -- set normal display (0xA6 / 0xA7)
OLED_Write_Cmd(0xAF); // 打开OLED -- turn on oled panel ： OXAE 关闭OLED 休眠模式 0xaf 打开oled
OLED_Fill(0x00); // 初始清屏
OLED_Coord(0, 0); // 设置原点坐标（0, 0）
}
代码
/************************************************************************************
* Copyright (c), 2014, HelTec Automatic Technology co.,LTD.
* All rights reserved.
*
* Http: www.heltec.cn
* Email: [email protected]
* WebShop: heltec.taobao.com
*
* File name: OLED_I2C.c
* Project : HelTec.uvprij
* Processor: STM32F103C8T6
* Compiler : MDK fo ARM
*
* Author : 小林
* Version: 1.00
* Date : 2014.4.8
* Email : [email protected]
* Modification: none
*
* Description:128*64点阵的OLED显示屏驱动文件，仅适用于惠特自动化(heltec.taobao.com)的SD1306驱动IIC通信方式显示屏
*
* Others: none;
*
* Function List:
* 1. void I2C_Configuration(void) -- 配置CPU的硬件I2C
* 2. void I2C_WriteByte(uint8_t addr,uint8_t data) -- 向寄存器地址写一个byte的数据
* 3. void WriteCmd(unsigned char I2C_Command) -- 写命令
* 4. void WriteDat(unsigned char I2C_Data) -- 写数据
* 5. void OLED_Init(void) -- OLED屏初始化
* 6. void OLED_SetPos(unsigned char x, unsigned char y) -- 设置起始点坐标
* 7. void OLED_Fill(unsigned char fill_Data) -- 全屏填充
* 8. void OLED_CLS(void) -- 清屏
* 9. void OLED_ON(void) -- 唤醒
* 10. void OLED_OFF(void) -- 睡眠
* 11. void OLED_ShowStr(unsigned char x, unsigned char y, unsigned char ch[], unsigned char TextSize) -- 显示字符串(字体大小有6*8和8*16两种)
* 12. void OLED_ShowCN(unsigned char x, unsigned char y, unsigned char N) -- 显示中文(中文需要先取模，然后放到codetab.h中)
* 13. void OLED_DrawBMP(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char BMP[]) -- BMP图片
*
* History: none;
*
*************************************************************************************/
#include "OLED_I2C.h"
#include "delay.h"
#include "codetab.h"
void I2C_Configuration(void)
{
I2C_InitTypeDef I2C_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
/*STM32F103C8T6芯片的硬件I2C: PB6 -- SCL; PB7 -- SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;//I2C必须开漏输出
GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_DeInit(I2C1);//使用I2C1
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x30;//主机的I2C地址,随便写的
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 400000;//400K
I2C_Cmd(I2C1, ENABLE);
I2C_Init(I2C1, &I2C_InitStructure);
}
void I2C_WriteByte(uint8_t addr,uint8_t data)
{
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
I2C_GenerateSTART(I2C1, ENABLE);//开启I2C1
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));/*EV5,主模式*/
I2C_Send7bitAddress(I2C1, OLED_ADDRESS, I2C_Direction_Transmitter);//器件地址 -- 默认0x78
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_SendData(I2C1, addr);//寄存器地址
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_SendData(I2C1, data);//发送数据
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_GenerateSTOP(I2C1, ENABLE);//关闭I2C1总线
}
void WriteCmd(unsigned char I2C_Command)//写命令
{
I2C_WriteByte(0x00, I2C_Command);
}
void WriteDat(unsigned char I2C_Data)//写数据
{
I2C_WriteByte(0x40, I2C_Data);
}
void OLED_Init(void)
{
DelayMs(100); //这里的延时很重要
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); //亮度调节 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_SetPos(unsigned char x, unsigned char y) //设置起始点坐标
{
WriteCmd(0xb0+y);
WriteCmd(((x&0xf0)>>4)|0x10);
WriteCmd((x&0x0f)|0x01);
}
void OLED_Fill(unsigned char fill_Data)//全屏填充
{
unsigned char m,n;
for(m=0;m<8;m++)
{
WriteCmd(0xb0+m); //page0-page1
WriteCmd(0x00); //low column start address 列地址的低4位
WriteCmd(0x10); //high column start address 列地址的高4位
for(n=0;n<128;n++)
{
WriteDat(fill_Data);
}
}
}
void OLED_CLS(void)//清屏
{
OLED_Fill(0x00);
}
//--------------------------------------------------------------
// Prototype : void OLED_ON(void)
// Calls :
// Parameters : none
// Description : 将OLED从休眠中唤醒
//--------------------------------------------------------------
void OLED_ON(void)
{
WriteCmd(0X8D); //设置电荷泵
WriteCmd(0X14); //开启电荷泵
WriteCmd(0XAF); //OLED唤醒
}
//--------------------------------------------------------------
// Prototype : void OLED_OFF(void)
// Calls :
// Parameters : none
// Description : 让OLED休眠 -- 休眠模式下,OLED功耗不到10uA
//--------------------------------------------------------------
void OLED_OFF(void)
{
WriteCmd(0X8D); //设置电荷泵
WriteCmd(0X10); //关闭电荷泵
WriteCmd(0XAE); //OLED休眠
}
//--------------------------------------------------------------
/*
Prototype : void OLED_ShowChar(unsigned char x, unsigned char y, unsigned char ch[], unsigned char TextSize)
Calls :
Parameters : x,y -- 起始点坐标(x:0~127, y:0~7);
ch[] -- 要显示的字符串;
TextSize -- 字符大小(1:6*8 ; 2:8*16)
Description : 显示codetab.h中的ASCII字符,有6*8和8*16可选择
//--------------------------------------------------------------
*/
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:
{
while(ch[j] != '\0')
{
c = ch[j] - 32;
if(x > 126)
{
x = 0;
y++;
}
OLED_SetPos(x,y);
for(i=0;i<6;i++)
WriteDat(F6x8[c][i]);
x += 6;
j++;
}
}break;
case 2:
{
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++;
}
}break;
}
}
//--------------------------------------------------------------
// Prototype : void OLED_ShowCN(unsigned char x, unsigned char y, unsigned char N)
// Calls :
// Parameters : x,y -- 起始点坐标(x:0~127, y:0~7); N:汉字在codetab.h中的索引
// Description : 显示codetab.h中的汉字,16*16点阵
//--------------------------------------------------------------
void OLED_ShowCN(unsigned char x, unsigned char y, unsigned char N)
{
unsigned char wm=0;
unsigned int adder=32*N;
OLED_SetPos(x , y);
for(wm = 0;wm < 16;wm++)
{
WriteDat(F16x16[adder]);
adder += 1;
}
OLED_SetPos(x,y + 1);
for(wm = 0;wm < 16;wm++)
{
WriteDat(F16x16[adder]);
adder += 1;
}
}
//--------------------------------------------------------------
// Prototype : void OLED_DrawBMP(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char BMP[]);
// Calls :
// Parameters : x0,y0 -- 起始点坐标(x0:0~127, y0:0~7);
// x1,y1 -- 起点对角线(结束点)的坐标(x1:1~128,y1:1~8)
// Description : 显示BMP位图
//--------------------------------------------------------------
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,y);
for(x=x0;x<x1;x++)
{
WriteDat(BMP[j++]);
}
}
}
#ifndef __OLED_I2C_H
#define __OLED_I2C_H
#include "stm32f10x.h"
#define OLED_ADDRESS 0x78 //通过调整0R电阻,屏可以0x78和0x7A两个地址 -- 默认0x78
void I2C_Configuration(void);
void I2C_WriteByte(uint8_t addr,uint8_t data);
void WriteCmd(unsigned char I2C_Command);
void WriteDat(unsigned char I2C_Data);
void OLED_Init(void);
void OLED_SetPos(unsigned char x, unsigned char y);
void OLED_Fill(unsigned char fill_Data);
void OLED_CLS(void);
void OLED_ON(void);
void OLED_OFF(void);
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[]);
#endif