看别人在论坛里移植了个小游戏，我也想尝试一把。这不先来调下OLED的显示。
坛里有人用软件IIC做了，那么今天我们来用硬件IIC试一下，看看能否驱动成功呢？
我们先来配置IIC，我们选择IIC1来驱动OLED，因为IIC2已经被我分配给EEPROM了。
我们查看手册，得知：
我们匹配:
//OLED
VCC-->3V3
SCL-->PB6(I2C1_SCL)
SDA-->PB7(I2C1_SDA)
GND-->GND
对OLED的IIC通讯与其他IIC元件没有什么不同。根据原理图提供：
得知OLED从机地址为：0x78。OLED板已经带了上拉，不然开发板上没有，还得接2个上拉电阻呢。
IIC正常的读写时序：
但这里我们仅仅对屏幕写操作，不读取任何。
IIC写单个字节的流程是：发送起始信号-->发送从机地址-->等待应答-->发送要写入的寄存器地址-->等待应答-->发送字节-->等待应答-->发送停止信号。
现在开始对IIC1进行初始化：
void IIC1_Init( u32 bound, u16 address )
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitTSturcture;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );
RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C1, ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOB, &GPIO_InitStructure );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOB, &GPIO_InitStructure );
I2C_InitTSturcture.I2C_ClockSpeed = bound;
I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;
I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitTSturcture.I2C_OwnAddress1 = address;
I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;
I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init( I2C1, &I2C_InitTSturcture );
I2C_Cmd( I2C1, ENABLE );
I2C_AcknowledgeConfig( I2C1, ENABLE );
}
//发送一个字节
//mode:数据/命令标志 0,表示命令;1,表示数据;
void OLED_WR_Byte(uint8_t dat,uint8_t mode)
{
while( I2C_GetFlagStatus( I2C1, I2C_FLAG_BUSY ) != RESET );
I2C_GenerateSTART( I2C1, ENABLE );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_MODE_SELECT ) );
I2C_Send7bitAddress( I2C1, 0X78, I2C_Direction_Transmitter );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) );
if(mode)
I2C_SendData( I2C1, (u8)(0x40&0x00FF) );
else
I2C_SendData( I2C1, (u8)(0x00&0x00FF) );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
if( I2C_GetFlagStatus( I2C1, I2C_FLAG_TXE ) != RESET )
{
I2C_SendData( I2C1, dat );
}
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
I2C_GenerateSTOP( I2C1, ENABLE );
}
//更新显存到OLED
void OLED_Refresh(void)
{
uint8_t i,n;
for(i=0;i<8;i++)
{
OLED_WR_Byte(0xb0+i,OLED_CMD); //设置行起始地址
OLED_WR_Byte(0x00,OLED_CMD); //设置低列起始地址
OLED_WR_Byte(0x10,OLED_CMD); //设置高列起始地址
I2C_Send7bitAddress( I2C1, 0X78, I2C_Direction_Transmitter );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) );
I2C_SendData( I2C1, (u8)(0x40&0x00FF) );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
for(n=0;n<128;n++)
{
if( I2C_GetFlagStatus( I2C1, I2C_FLAG_TXE ) != RESET )
{
I2C_SendData( I2C1, OLED_GRAM[n][i] );
}
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
}
I2C_GenerateSTOP( I2C1, ENABLE );
}
}
OLED全面的文件：
oled.h:
/*
* oled.h
*
* Created on: Nov 26, 2020
* Author: Administrator
*/
#ifndef OLED_H_
#define OLED_H_
#include "ch32v10x.h"
#define OLED_ADDRESS 0x78 //通过调整0R电阻,屏可以选择0x78 0x7A两个地址 默认为0x78
#define OLED_CMD 0 //写命令
#define OLED_DATA 1 //写数据
/*
* oled.c
*
* Created on: Nov 26, 2020
* Author: Administrator
*/
/*
* i2c_eeprom.c
*
* Created on: Nov 21, 2020
* Author: Administrator
*/
#include "oled.h"
#include "oledfont.h"
#include "debug.h"
uint8_t OLED_GRAM[144][8];
/*******************************************************************************
* Function Name : IIC_Init
* Description : Initializes the IIC peripheral.
* Input : None
* Return : None
*******************************************************************************/
void IIC1_Init( u32 bound, u16 address )
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitTSturcture;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );
RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C1, ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOB, &GPIO_InitStructure );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOB, &GPIO_InitStructure );
I2C_InitTSturcture.I2C_ClockSpeed = bound;
I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;
I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitTSturcture.I2C_OwnAddress1 = address;
I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;
I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init( I2C1, &I2C_InitTSturcture );
I2C_Cmd( I2C1, ENABLE );
I2C_AcknowledgeConfig( I2C1, ENABLE );
}
/*******************************************************************************
* Function Name : AT24CXX_Init
* Description : Initializes AT24xx EEPROM.
* Input : None
* Return : None
********************************************************************************/
void OLED_Init(void)
{
//VCC GND 定义
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//PB5-->VCC PB8-->GND
GPIO_WriteBit(GPIOB, GPIO_Pin_5, Bit_SET);//PB5=1
GPIO_WriteBit(GPIOB, GPIO_Pin_8, Bit_SET);//PB8=0
Delay_Ms(500);//等待供电稳定，可能不需要
//IIC 初始化 SALVE ADD 0x78
IIC1_Init( 100000, 0x78);
//OLED 初始化指令
OLED_WR_Byte(0xAE,OLED_CMD);//--turn off oled panel
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 Set Mapping RAM Display Start Line (0x00~0x3F)
OLED_WR_Byte(0x81,OLED_CMD);//--set contrast control register
OLED_WR_Byte(0xCF,OLED_CMD);// Set SEG Output Current Brightness
OLED_WR_Byte(0xA1,OLED_CMD);//--Set SEG/Column Mapping 0xa0左右反置 0xa1正常
OLED_WR_Byte(0xC8,OLED_CMD);//Set COM/Row Scan Direction 0xc0上下反置 0xc8正常
OLED_WR_Byte(0xA6,OLED_CMD);//--set normal display
OLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)
OLED_WR_Byte(0x3f,OLED_CMD);//--1/64 duty
OLED_WR_Byte(0xD3,OLED_CMD);//-set display offset Shift Mapping RAM Counter (0x00~0x3F)
OLED_WR_Byte(0x00,OLED_CMD);//-not offset
OLED_WR_Byte(0xd5,OLED_CMD);//--set display clock divide ratio/oscillator frequency
OLED_WR_Byte(0x80,OLED_CMD);//--set divide ratio, Set Clock as 100 Frames/Sec
OLED_WR_Byte(0xD9,OLED_CMD);//--set pre-charge period
OLED_WR_Byte(0xF1,OLED_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
OLED_WR_Byte(0xDA,OLED_CMD);//--set com pins hardware configuration
OLED_WR_Byte(0x12,OLED_CMD);
OLED_WR_Byte(0xDB,OLED_CMD);//--set vcomh
OLED_WR_Byte(0x40,OLED_CMD);//Set VCOM Deselect Level
OLED_WR_Byte(0x20,OLED_CMD);//-Set Page Addressing Mode (0x00/0x01/0x02)
OLED_WR_Byte(0x02,OLED_CMD);//
OLED_WR_Byte(0x8D,OLED_CMD);//--set Charge Pump enable/disable
OLED_WR_Byte(0x14,OLED_CMD);//--set(0x10) disable
OLED_WR_Byte(0xA4,OLED_CMD);// Disable Entire Display On (0xa4/0xa5)
OLED_WR_Byte(0xA6,OLED_CMD);// Disable Inverse Display On (0xa6/a7)
OLED_Clear();
OLED_WR_Byte(0xAF,OLED_CMD);
}
//延时
void IIC_delay(void)
{
Delay_Us(4);
}
//反显函数
void OLED_ColorTurn(uint8_t i)
{
if(i==0)
{
OLED_WR_Byte(0xA6,OLED_CMD);//正常显示
}
if(i==1)
{
OLED_WR_Byte(0xA7,OLED_CMD);//反色显示
}
}
//屏幕旋转180度
void OLED_DisplayTurn(uint8_t i)
{
if(i==0)
{
OLED_WR_Byte(0xC8,OLED_CMD);//正常显示
OLED_WR_Byte(0xA1,OLED_CMD);
}
if(i==1)
{
OLED_WR_Byte(0xC0,OLED_CMD);//反转显示
OLED_WR_Byte(0xA0,OLED_CMD);
}
}
//发送一个字节
//mode:数据/命令标志 0,表示命令;1,表示数据;
void OLED_WR_Byte(uint8_t dat,uint8_t mode)
{
while( I2C_GetFlagStatus( I2C1, I2C_FLAG_BUSY ) != RESET );
I2C_GenerateSTART( I2C1, ENABLE );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_MODE_SELECT ) );
I2C_Send7bitAddress( I2C1, 0X78, I2C_Direction_Transmitter );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) );
if(mode)
I2C_SendData( I2C1, (u8)(0x40&0x00FF) );
else
I2C_SendData( I2C1, (u8)(0x00&0x00FF) );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
if( I2C_GetFlagStatus( I2C1, I2C_FLAG_TXE ) != RESET )
{
I2C_SendData( I2C1, dat );
}
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
I2C_GenerateSTOP( I2C1, ENABLE );
}
//开启OLED显示
void OLED_DisPlay_On(void)
{
OLED_WR_Byte(0x8D,OLED_CMD);//电荷泵使能
OLED_WR_Byte(0x14,OLED_CMD);//开启电荷泵
OLED_WR_Byte(0xAF,OLED_CMD);//点亮屏幕
}
//关闭OLED显示
void OLED_DisPlay_Off(void)
{
OLED_WR_Byte(0x8D,OLED_CMD);//电荷泵使能
OLED_WR_Byte(0x10,OLED_CMD);//关闭电荷泵
OLED_WR_Byte(0xAE,OLED_CMD);//关闭屏幕
}
//更新显存到OLED
void OLED_Refresh(void)
{
uint8_t i,n;
for(i=0;i<8;i++)
{
OLED_WR_Byte(0xb0+i,OLED_CMD); //设置行起始地址
OLED_WR_Byte(0x00,OLED_CMD); //设置低列起始地址
OLED_WR_Byte(0x10,OLED_CMD); //设置高列起始地址
while( I2C_GetFlagStatus( I2C1, I2C_FLAG_BUSY ) != RESET );
I2C_GenerateSTART( I2C1, ENABLE );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_MODE_SELECT ) );
I2C_Send7bitAddress( I2C1, 0X78, I2C_Direction_Transmitter );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) );
I2C_SendData( I2C1, (u8)(0x40&0x00FF) );
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
for(n=0;n<128;n++)
{
if( I2C_GetFlagStatus( I2C1, I2C_FLAG_TXE ) != RESET )
{
I2C_SendData( I2C1, OLED_GRAM[n][i] );
}
while( !I2C_CheckEvent( I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
}
I2C_GenerateSTOP( I2C1, ENABLE );
}
}
//清屏函数
void OLED_Clear(void)
{
uint8_t i,n;
for(i=0;i<8;i++)
{
for(n=0;n<128;n++)
{
OLED_GRAM[n][i]=0;//清除所有数据
}
}
OLED_Refresh();//更新显示
}
//画点
//x:0~127
//y:0~63
//t:1 填充 0,清空
void OLED_DrawPoint(uint8_t x,uint8_t y,uint8_t t)
{
uint8_t i,m,n;
i=y/8;
m=y%8;
n=1<<m;
if(t){OLED_GRAM[x][i]|=n;}
else
{
OLED_GRAM[x][i]=~OLED_GRAM[x][i];
OLED_GRAM[x][i]|=n;
OLED_GRAM[x][i]=~OLED_GRAM[x][i];
}
}
//画线
//x1,y1:起点坐标
//x2,y2:结束坐标
void OLED_DrawLine(uint8_t x1,uint8_t y1,uint8_t x2,uint8_t y2,uint8_t mode)
{
uint16_t t;
int xerr=0,yerr=0,delta_x,delta_y,distance;
int incx,incy,uRow,uCol;
delta_x=x2-x1; //计算坐标增量
delta_y=y2-y1;
uRow=x1;//画线起点坐标
uCol=y1;
if(delta_x>0)incx=1; //设置单步方向
else if (delta_x==0)incx=0;//垂直线
else {incx=-1;delta_x=-delta_x;}
if(delta_y>0)incy=1;
else if (delta_y==0)incy=0;//水平线
else {incy=-1;delta_y=-delta_x;}
if(delta_x>delta_y)distance=delta_x; //选取基本增量坐标轴
else distance=delta_y;
for(t=0;t<distance+1;t++)
{
OLED_DrawPoint(uRow,uCol,mode);//画点
xerr+=delta_x;
yerr+=delta_y;
if(xerr>distance)
{
xerr-=distance;
uRow+=incx;
}
if(yerr>distance)
{
yerr-=distance;
uCol+=incy;
}
}
}
//x,y:圆心坐标
//r:圆的半径
void OLED_DrawCircle(uint8_t x,uint8_t y,uint8_t r)
{
int Na, Nb,num;
Na = 0;
Nb = r;
while(2 * Nb * Nb >= r * r)
{
OLED_DrawPoint(x + Na, y - Nb,1);
OLED_DrawPoint(x - Na, y - Nb,1);
OLED_DrawPoint(x - Na, y + Nb,1);
OLED_DrawPoint(x + Na, y + Nb,1);
OLED_DrawPoint(x + Nb, y + Na,1);
OLED_DrawPoint(x + Nb, y - Na,1);
OLED_DrawPoint(x - Nb, y - Na,1);
OLED_DrawPoint(x - Nb, y + Na,1);
Na++;
num = (Na * Na + Nb * Nb) - r*r;//计算画的点离圆心的距离
if(num > 0)
{
Nb--;
Na--;
}
}
}
//在指定位置显示一个字符,包括部分字符
//x:0~127
//y:0~63
//size1:选择字体 6x8/6x12/8x16/12x24
//mode:0,反色显示;1,正常显示
void OLED_ShowChar(uint8_t x,uint8_t y,uint8_t chr,uint8_t size1,uint8_t mode)
{
uint8_t i,m,temp,size2,chr1;
uint8_t x0=x,y0=y;
if(size1==8)size2=6;
else size2=(size1/8+((size1%8)?1:0))*(size1/2); //得到字体一个字符对应点阵集所占的字节数
chr1=chr-' '; //计算偏移后的值
for(i=0;i<size2;i++)
{
if(size1==8)
{temp=asc2_0806[chr1][i];} //调用0806字体
else if(size1==12)
{temp=asc2_1206[chr1][i];} //调用1206字体
else if(size1==16)
{temp=asc2_1608[chr1][i];} //调用1608字体
else if(size1==24)
{temp=asc2_2412[chr1][i];} //调用2412字体
else return;
for(m=0;m<8;m++)
{
if(temp&0x01)OLED_DrawPoint(x,y,mode);
else OLED_DrawPoint(x,y,!mode);
temp>>=1;
y++;
}
x++;
if((size1!=8)&&((x-x0)==size1/2))
{x=x0;y0=y0+8;}
y=y0;
}
}
//显示字符串
//x,y:起点坐标
//size1:字体大小
//*chr:字符串起始地址
//mode:0,反色显示;1,正常显示
void OLED_ShowString(uint8_t x,uint8_t y,uint8_t *chr,uint8_t size1,uint8_t mode)
{
while((*chr>=' ')&&(*chr<='~'))//判断是不是非法字符!
{
OLED_ShowChar(x,y,*chr,size1,mode);
if(size1==8)x+=6;
else x+=size1/2;
chr++;
}
}
//m^n
uint32_t OLED_Pow(uint8_t m,uint8_t n)
{
uint32_t result=1;
while(n--)
{
result*=m;
}
return result;
}
//显示数字
//x,y :起点坐标
//num :要显示的数字
//len :数字的位数
//size:字体大小
//mode:0,反色显示;1,正常显示
void OLED_ShowNum(uint8_t x,uint8_t y,uint32_t num,uint8_t len,uint8_t size1,uint8_t mode)
{
uint8_t t,temp,m=0;
if(size1==8)m=2;
for(t=0;t<len;t++)
{
temp=(num/OLED_Pow(10,len-t-1))%10;
if(temp==0)
{
OLED_ShowChar(x+(size1/2+m)*t,y,'0',size1,mode);
}
else
{
OLED_ShowChar(x+(size1/2+m)*t,y,temp+'0',size1,mode);
}
}
}
//显示汉字
//x,y:起点坐标
//num:汉字对应的序号
//mode:0,反色显示;1,正常显示
void OLED_ShowChinese(uint8_t x,uint8_t y,uint8_t num,uint8_t size1,uint8_t mode)
{
uint8_t m,temp;
uint8_t x0=x,y0=y;
uint16_t i,size3=(size1/8+((size1%8)?1:0))*size1; //得到字体一个字符对应点阵集所占的字节数
for(i=0;i<size3;i++)
{
if(size1==16)
{temp=Hzk1[num][i];}//调用16*16字体
else if(size1==24)
{temp=Hzk2[num][i];}//调用24*24字体
else if(size1==32)
{temp=Hzk3[num][i];}//调用32*32字体
else if(size1==64)
{temp=Hzk4[num][i];}//调用64*64字体
else return;
for(m=0;m<8;m++)
{
if(temp&0x01)OLED_DrawPoint(x,y,mode);
else OLED_DrawPoint(x,y,!mode);
temp>>=1;
y++;
}
x++;
if((x-x0)==size1)
{x=x0;y0=y0+8;}
y=y0;
}
}
//num 显示汉字的个数
//space 每一遍显示的间隔
//mode:0,反色显示;1,正常显示
void OLED_ScrollDisplay(uint8_t num,uint8_t space,uint8_t mode)
{
uint8_t i,n,t=0,m=0,r;
while(1)
{
if(m==0)
{
OLED_ShowChinese(128,24,t,16,mode); //写入一个汉字保存在OLED_GRAM[][]数组中
t++;
}
if(t==num)
{
for(r=0;r<16*space;r++) //显示间隔
{
for(i=1;i<144;i++)
{
for(n=0;n<8;n++)
{
OLED_GRAM[i-1][n]=OLED_GRAM[i][n];
}
}
OLED_Refresh();
}
t=0;
}
m++;
if(m==16){m=0;}
for(i=1;i<144;i++) //实现左移
{
for(n=0;n<8;n++)
{
OLED_GRAM[i-1][n]=OLED_GRAM[i][n];
}
}
OLED_Refresh();
}
}
//x,y：起点坐标
//sizex,sizey,图片长宽
//BMP[]：要写入的图片数组
//mode:0,反色显示;1,正常显示
void OLED_ShowPicture(uint8_t x,uint8_t y,uint8_t sizex,uint8_t sizey,uint8_t BMP[],uint8_t mode)
{
uint16_t j=0;
uint8_t i,n,temp,m;
uint8_t x0=x,y0=y;
sizey=sizey/8+((sizey%8)?1:0);
for(n=0;n<sizey;n++)
{
for(i=0;i<sizex;i++)
{
temp=BMP[j];
j++;
for(m=0;m<8;m++)
{
if(temp&0x01)OLED_DrawPoint(x,y,mode);
else OLED_DrawPoint(x,y,!mode);
temp>>=1;
y++;
}
x++;
if((x-x0)==sizex)
{
x=x0;
y0=y0+8;
}
y=y0;
}
}
}
编译下载.查看OLED现象：
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