基于CH554开发板的OLED屏显示
<div class='showpostmsg'> 本帖最后由 jennyzhaojie 于 2017-10-15 10:53 编辑由于CH554开发板所配备的外设资源有限，所以为它丰富相应的外设资源及功能是十分重要的。为节省对I/O口资源的占用，这里所选用的器件是一个采用I2C接口的0.96寸双色OLED屏，除电源外它只使用2个I/O来模拟I2C通讯以使OLED屏工作，其显示效果如下图所示。
OLED屏显示效果
OLED屏与CH554的连接关系如下：SCL---P1.0SDA--P1.1故为了便于编程，所做的定义为：sbit scl = P1^0;sbit sda = P1^1;#define OLED_SCLK_Clr() scl =0#define OLED_SCLK_Set() scl =1#define OLED_SDIN_Clr() sda =0#define OLED_SDIN_Set() sda =1
进行I2C通讯的相关函数如下：void IIC_Start()
{
OLED_SCLK_Set();
OLED_SDIN_Set();
OLED_SDIN_Clr();
OLED_SCLK_Clr();
}
void IIC_Stop()
{
OLED_SCLK_Set();
OLED_SDIN_Clr();
OLED_SDIN_Set();
}
void IIC_Wait_Ack()
{
OLED_SCLK_Set() ;
OLED_SCLK_Clr();
}
void Write_IIC_Byte(unsigned char IIC_Byte)
{
unsigned char i;
unsigned char m,da;
da=IIC_Byte;
OLED_SCLK_Clr();
for(i=0;i<8;i++)
{
m=da;
m=m&0x80;
if(m==0x80)
{OLED_SDIN_Set();}
else OLED_SDIN_Clr();
da=da<<1;
OLED_SCLK_Set();
OLED_SCLK_Clr();
}
}
void Write_IIC_Command(unsigned char IIC_Command)
{
IIC_Start();
Write_IIC_Byte(0x78);
IIC_Wait_Ack();
Write_IIC_Byte(0x00);
IIC_Wait_Ack();
Write_IIC_Byte(IIC_Command);
IIC_Wait_Ack();
IIC_Stop();
}
void Write_IIC_Data(unsigned char IIC_Data)
{
IIC_Start();
Write_IIC_Byte(0x78);
IIC_Wait_Ack();
Write_IIC_Byte(0x40);
IIC_Wait_Ack();
Write_IIC_Byte(IIC_Data);
IIC_Wait_Ack();
IIC_Stop();
}
供OLED屏显示所用到的函数如下：void OLED_WR_Byte(unsigned dat,unsigned cmd)
{
if(cmd)
{
Write_IIC_Data(dat);
}
else
{
Write_IIC_Command(dat);
}
}
void OLED_Set_Pos(unsigned char x, unsigned char y)
{
OLED_WR_Byte(0xb0+y,OLED_CMD);
OLED_WR_Byte(((x&0xf0)>>4)|0x10,OLED_CMD);
OLED_WR_Byte((x&0x0f),OLED_CMD);
}
void OLED_Clear(void)
{
unsigned char i,n;
for(i=0;i<8;i++)
{
OLED_WR_Byte (0xb0+i,OLED_CMD);
OLED_WR_Byte (0x00,OLED_CMD);
OLED_WR_Byte (0x10,OLED_CMD);
for(n=0;n<128;n++)OLED_WR_Byte(0,OLED_DATA);
}
}
void OLED_ShowChar(unsigned char x,unsigned char y,unsigned char chr,unsigned char Char_Size)
{
unsigned char c=0,i=0;
c=chr-' ';
if(x>Max_Column-1){x=0;y=y+2;}
if(Char_Size ==6)
{
OLED_Set_Pos(x,y);
for(i=0;i<6;i++)
OLED_WR_Byte(F6x8,OLED_DATA);
}
}
void OLED_Init(void)
{
Port1Cfg(1,0); //P1配置第0口模式为1
Port1Cfg(1,1); //P1配置第1口模式为1
mDelaymS(800);
OLED_WR_Byte(0xAE,OLED_CMD);
OLED_WR_Byte(0x00,OLED_CMD);
OLED_WR_Byte(0x10,OLED_CMD);
OLED_WR_Byte(0x40,OLED_CMD);
OLED_WR_Byte(0xB0,OLED_CMD);
OLED_WR_Byte(0x81,OLED_CMD);
OLED_WR_Byte(0xFF,OLED_CMD);
OLED_WR_Byte(0xA1,OLED_CMD);
OLED_WR_Byte(0xA6,OLED_CMD);
OLED_WR_Byte(0xA8,OLED_CMD);
OLED_WR_Byte(0x3F,OLED_CMD);
OLED_WR_Byte(0xC8,OLED_CMD);
OLED_WR_Byte(0xD3,OLED_CMD);
OLED_WR_Byte(0x00,OLED_CMD);
OLED_WR_Byte(0xD5,OLED_CMD);
OLED_WR_Byte(0x80,OLED_CMD);
OLED_WR_Byte(0xD8,OLED_CMD);
OLED_WR_Byte(0x05,OLED_CMD);
OLED_WR_Byte(0xD9,OLED_CMD);
OLED_WR_Byte(0xF1,OLED_CMD);
OLED_WR_Byte(0xDA,OLED_CMD);
OLED_WR_Byte(0x12,OLED_CMD);
OLED_WR_Byte(0xDB,OLED_CMD);
OLED_WR_Byte(0x30,OLED_CMD);
OLED_WR_Byte(0x8D,OLED_CMD);
OLED_WR_Byte(0x14,OLED_CMD);
OLED_WR_Byte(0xAF,OLED_CMD);
}
实现显示效果的主函数为：void main( )
{
CfgFsys( );
OLED_Init();
OLED_Clear();
OLED_ShowChar(0,0,'a',6);
OLED_ShowChar(0,1,'A',6);
OLED_ShowString(6,3,"0.96' OLED TEST",6);
while(1);
}有了前面的基础，配上A/D转换就可以直接观察采样结果了。
此内容由EEWORLD论坛网友jennyzhaojie原创，如需转载或用于商业用途需征得作者同意并注明出处
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