【AutoChips MCU 评测报告】+I2C2驱动oled显示

只看该作者 · 2020-10-21 15:05

本帖最后由 qjp1988113 于 2020-10-21 15:05 编辑

AC781X开发板上面预留OLED的I2C2的接口，我手头上有OLED模块，正好测试一下I2C。我们先看板子上的硬件连接：

查看引脚复用功能的位置：

官方的库，写的还是比较全，包括IIC开启，关闭，应答，发送/接收单字节等单步的操作都有。
也有封装好的直接使用的发送接收函数，还有使用DMA的。
我们这里用分段的步骤，自己组合，比较有灵活性，也便于移植。

新建oled.c:
///////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include "oled.h"
#include "oledfont.h"

uint8_t OLED_GRAM[144][8];

void I2C2_Init(void)
{
      I2C_ConfigType i2cConfig = {0};

      GPIO_SetFunc(I2C2_SDA_PIN, GPIO_FUNC_1);
      GPIO_SetFunc(I2C2_SCL_PIN, GPIO_FUNC_1);

      i2cConfig.setting.master = ENABLE;
      i2cConfig.setting.intEn  = DISABLE;//不开启中断
      i2cConfig.setting.i2cEn  = ENABLE;
      i2cConfig.setting.syncEn = ENABLE;
//       i2cConfig.setting.strEn  = ENABLE;
      i2cConfig.addr1       = OLED_ADDRESS;
      i2cConfig.sampleCNT = 11;//  //400K波特率 speed = APBclk/((sampleCnt+1)*(stepCNT+1)*2)
      i2cConfig.stepCNT = 4;
      I2C_Initialize(I2C2, &i2cConfig);

}

//延时
void IIC_delay(void)
{
//       uint8_t t=3;
//       while(t--);
      udelay(4);
}

//起始信号
void MyI2C_Start(void)
{
      I2C_Start(I2C2);
}

//结束信号
void MyI2C_Stop(void)
{
      I2C_Stop(I2C2);
}

//等待信号响应
void MyI2C_WaitAck(void) //测数据信号的电平
{
      I2C_SendAck(I2C2);
}

//写入一个字节
void MySend_Byte(uint8_t dat)
{
      I2C_WriteOneByte(I2C2, dat);
}
//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)
{
      MyI2C_Start();
      MySend_Byte(0x78);
      MyI2C_WaitAck();
      if(mode){MySend_Byte(0x40);}
  else{MySend_Byte(0x00);}
      MyI2C_WaitAck();
      MySend_Byte(dat);
      MyI2C_WaitAck();
      MyI2C_Stop();
}

//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
            MyI2C_Start();
            MySend_Byte(0x78);
            MyI2C_WaitAck();
            MySend_Byte(0x40);
            MyI2C_WaitAck();
            for(n=0;n<128;n++)
            {
                     MySend_Byte(OLED_GRAM[n]);
                     MyI2C_WaitAck();
            }
            MyI2C_Stop();
  }

}
//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]=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]|=n;}
      else
      {
            OLED_GRAM[x]=~OLED_GRAM[x];
            OLED_GRAM[x]|=n;
            OLED_GRAM[x]=~OLED_GRAM[x];
      }
}

//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];} //调用0806字体
            else if(size1==12)
      {temp=asc2_1206[chr1];} //调用1206字体
            else if(size1==16)
      {temp=asc2_1608[chr1];} //调用1608字体
            else if(size1==24)
      {temp=asc2_2412[chr1];} //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];}//调用16*16字体
            else if(size1==24)
                              {temp=Hzk2[num];}//调用24*24字体
            else if(size1==32)
                              {temp=Hzk3[num];}//调用32*32字体
            else if(size1==64)
                              {temp=Hzk4[num];}//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[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[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;
   }
      }
}
//OLED的初始化
void OLED_Init(void)
{

      I2C2_Init();

      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);
}

新建oled.h:
///////////////////////////////////////////////////////////////////////////////////////////////////////////////
#ifndef __OLED_H_
#define __OLED_H_

#include "ac78xx_i2c.h"
#include "ac78xx_timer.h"
#include "gpio.h"

//PC6-->I2C2_SDA
//PC5-->I2C2_SCL
#define I2C2_SDA_PIN                      (GPIO_PC6)
#define I2C2_SCL_PIN                      (GPIO_PC5)

#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

void MyI2C_Start(void);
void MyI2C_Stop(void);
void MyI2C_WaitAck(void);
void MySend_Byte(uint8_t dat);

void OLED_ClearPoint(uint8_t x,uint8_t y);
void OLED_ColorTurn(uint8_t i);
void OLED_DisplayTurn(uint8_t i);
void OLED_WR_Byte(uint8_t dat,uint8_t mode);
void OLED_DisPlay_On(void);
void OLED_DisPlay_Off(void);
void OLED_Refresh(void);
void OLED_Clear(void);
void OLED_DrawPoint(uint8_t x,uint8_t y,uint8_t t);
void OLED_DrawLine(uint8_t x1,uint8_t y1,uint8_t x2,uint8_t y2,uint8_t mode);
void OLED_DrawCircle(uint8_t x,uint8_t y,uint8_t r);
void OLED_ShowChar(uint8_t x,uint8_t y,uint8_t chr,uint8_t size1,uint8_t mode);
void OLED_ShowChar6x8(uint8_t x,uint8_t y,uint8_t chr,uint8_t mode);
void OLED_ShowString(uint8_t x,uint8_t y,uint8_t *chr,uint8_t size1,uint8_t mode);
void OLED_ShowNum(uint8_t x,uint8_t y,uint32_t num,uint8_t len,uint8_t size1,uint8_t mode);
void OLED_ShowChinese(uint8_t x,uint8_t y,uint8_t num,uint8_t size1,uint8_t mode);
void OLED_ScrollDisplay(uint8_t num,uint8_t space,uint8_t mode);
void OLED_ShowPicture(uint8_t x,uint8_t y,uint8_t sizex,uint8_t sizey,uint8_t BMP[],uint8_t mode);
void OLED_Init(void);
#endif

main.c:
///////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include "oled.h"
#include "bmp.h"

int main(void)
{
      uint8_t Key**=0;
      uint8_t idel=0;
      uint8_t t=' ';
      InitDelay();
      InitDebug();
      GPIO_InitHardwr();
      OLED_Init();
      OLED_ColorTurn(0);//0正常显示，1 反色显示
  OLED_DisplayTurn(0);//0正常显示 1 屏幕翻转显示

      while(1)
      {
            if(K6_IN==0)
            {
                     while(K6_IN==0);
                     OLED_Clear();
                     Key**++;
                     if(Key**>4) Key**=0;
            }
            else if(K7_IN==0)
            {
                     while(K7_IN==0);
                     idel=1-idel;
                     while(idel)
                     {
                              if(K7_IN==0)
                              {
                                    while(K7_IN==0);
                                    idel=1-idel;
                              }
                     }

            }

            switch(Key**)
            {
                     case 0:
                     {
                              //OLED_Clear();
                              OLED_ShowPicture(0,0,128,64,BMP1,1);
                              OLED_Refresh();
                              mdelay(500);

                              OLED_ShowPicture(0,0,128,64,BMP2,1);
                              OLED_Refresh();
                              mdelay(500);

                              OLED_ShowPicture(0,0,128,64,BMP3,1);
                              OLED_Refresh();
                              mdelay(500);

                              OLED_ShowPicture(0,0,128,64,BMP4,1);
                              OLED_Refresh();
                              mdelay(500);
                     }
                     break;

                     case 1:
                     {
                              //OLED_Clear();
                              OLED_ShowPicture(0,0,128,32,BMP5,1);
                              OLED_ShowString(2,32,"AutoChip-AC781X",16,1);
                              OLED_ShowString(0,48,"qjp1988113 2020/10/20",8,1);

                              OLED_Refresh();
                              //mdelay(500);

                     }
                     break;

                     case 2:
                     {
                              //OLED_Clear();
                              OLED_ShowChinese(0+8,0,0,16,1); //钟
                              OLED_ShowChinese(18+8,0,1,16,1);//茗
                              OLED_ShowChinese(36+8,0,2,16,1);//电
                              OLED_ShowChinese(54+8,0,3,16,1);//器
                              OLED_ShowChinese(72+8,0,4,16,1);//科
                              OLED_ShowChinese(90+8,0,5,16,1);//技
                              //             OLED_ShowChinese(108,0,6,16,1);//术
                              OLED_ShowString(0,16,"ZhongMinElectric.Com",8,1);
                              OLED_ShowString(4,32,"JiangShu ChangZhou",8,1);
                              OLED_ShowString(0,48,"ASCII:",16,1);
                              OLED_ShowString(63,48,"CODE:",16,1);
                              OLED_ShowChar(48,48,t,16,1);//显示ASCII字符
                              t++;
                              if(t>'~')t=' ';
                              OLED_ShowNum(103,48,t,3,16,1);
                              OLED_Refresh();
                              mdelay(50);
                              //mdelay(500);

                     }
                     break;

                     case 3:
                     {
                              //OLED_Clear();
                              OLED_ShowChinese(0,0,0,16,1);  //16*16 中
                              OLED_ShowChinese(16,0,0,24,1); //24*24 中
                              OLED_ShowChinese(24,20,0,32,1);//32*32 中
                              OLED_ShowChinese(64,0,0,64,1); //64*64 中
                              OLED_Refresh();
                              //mdelay(500);
                     }
                     break;

                     case 4:
                     {
                              //OLED_Clear();
                              OLED_ShowString(0,0,"ABC",8,1);//6*8 “ABC”
                              OLED_ShowString(0,8,"ABC",12,1);//6*12 “ABC”
                              OLED_ShowString(0,20,"ABC",16,1);//8*16 “ABC”
                              OLED_ShowString(0,36,"ABC",24,1);//12*24 “ABC”
                              OLED_Refresh();
                              //mdelay(500);
                     }
                     break;
                     default:break;
            }

      }
}

按K6键可以切换不同的界面，长按K7可以暂停，再次按继续。
编译，下载，运行，现象如下：

P1.jpg (310.29 KB )

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P2.jpg (318.37 KB )

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P3.jpg (290.95 KB )

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P4.jpg (282.12 KB )

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只看该作者 · 2020-10-22 09:15

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