【NanoPi K1 Plus试用体验】IIC调试之OLED

上次帖子里有提到，wiringPI已经写好了IIC、SPI等外设的驱动，接下来的实验从IIC开始吧

之前已经用单片机驱动过OLED，底层IIC函数如下：

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);
}

屏幕的所有操作都是通过这两个函数控制的，所以这里我们只要把这两个函数改成nanoPi的就可以了

void WriteCmd(unsigned char I2C_Command)//写命令
{
// I2C_WriteByte(0x00, I2C_Command);
wiringPiI2CWriteReg8(fd, 0x00, I2C_Command);
}
void WriteDat(unsigned char I2C_Data)//写数据
{
// I2C_WriteByte(0x40, I2C_Data);
wiringPiI2CWriteReg8(fd, 0x40, I2C_Data);
}

wiringPiI2CWriteReg8函数在wiringPiI2C.c中可以找到；

剩下的就是普通OLED的寄存器操作了

完整代码：

/***
Copyright (c) 2018
All rights reserved.
File name :oled_iic_main.c
file identification :
Subject :Say something about the file
Current Version :V1.0.0
Author :Hacker
Date :
Instead Version :
Author :Hacker
Date :
***/
#include
#include
#include "wiringPiI2C.h"
#include "codetab.h"
#include "pcf8574.h"
// LED Pin - wiringPi pin 0 is BCM_GPIO 17.
#define OLED_ADDRESS 0x3C //通过调整0R电阻,屏可以0x78和0x7A两个地址 -- 默认0x78
int fd = 0;
void WriteCmd(unsigned char I2C_Command)//写命令
{
// I2C_WriteByte(0x00, I2C_Command);
wiringPiI2CWriteReg8(fd, 0x00, I2C_Command);
}
void WriteDat(unsigned char I2C_Data)//写数据
{
// I2C_WriteByte(0x40, I2C_Data);
wiringPiI2CWriteReg8(fd, 0x40, I2C_Data);
}
void OLED_Init(void)
{
delay(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
WriteCmd(0x10); //high column start address
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
{
OLED_SetPos(x0,y);
for(x=x0;x
{
WriteDat(BMP[j++]);
}
}
}
int main (void)
{
printf ("nanoPi oled
") ;
fd = wiringPiI2CSetup(OLED_ADDRESS);
printf ("fd = %d
", fd) ;
OLED_Init();
delay(100);
OLED_Fill(0xa0);
delay(500);
OLED_Fill(0x60);
delay(500);
OLED_Fill(0);
delay(500);
OLED_ShowStr(10, 2, "Haha, nanoPi", 1);
OLED_ShowStr(10, 3, "Haha, nanoPi", 2);
printf ("test end
") ;
return 0 ;
}