STM32F413开发板上实现OLED屏显示

jinglixixi · 发表于2016-12-18 10:28

STM32F413开发板上实现OLED屏显示 [复制链接]

对于STM32F413开发板来说，它就像一张可供你实现各种可能的白纸，你总是需要为它配上些什么才好使用。这里我们就为它配上一个使用IIC接口的OLED屏来进行人机交互，

其使用效果如图所示。

OLED

屏显示效果图

OLED屏与STM32F413的连接关系为SCK接PA5，SDA接PA6，故程序的初始定义如下：

// STM32F413+IIC_OLED
#include "main.h"
#include "oledfont.h"
#include "bmp.h"
#define OLED_MODE 0
#define SIZE 8
#define XLevelL 0x00
#define XLevelH 0x10
#define Max_Column 128
#define Max_Row 64
#define Brightness 0xFF
#define X_WIDTH 128
#define Y_WIDTH 64
#define OLED_SCLK_Clr() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET)
#define OLED_SCLK_Set() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET)
#define OLED_SDIN_Clr() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_7, GPIO_PIN_RESET)
#define OLED_SDIN_Set() HAL_GPIO_WritePin(GPIOA, GPIO_PIN_7, GPIO_PIN_SET)
#define OLED_CMD 0
#define OLED_DATA 1

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为了使OLED屏工作，其初始化的函数为：

// SSD1306
void OLED_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_5|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
OLED_SCLK_Set();
OLED_SDIN_Set();
Delay_1ms(800); //delay_ms(800);
OLED_WR_Byte(0xAE,OLED_CMD);//--display off
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
OLED_WR_Byte(0xB0,OLED_CMD);//--set page address
OLED_WR_Byte(0x81,OLED_CMD); // contract control
OLED_WR_Byte(0xFF,OLED_CMD);//--128
OLED_WR_Byte(0xA1,OLED_CMD);//set segment remap
OLED_WR_Byte(0xA6,OLED_CMD);//--normal / reverse
OLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)
OLED_WR_Byte(0x3F,OLED_CMD);//--1/32 duty
OLED_WR_Byte(0xC8,OLED_CMD);//Com scan direction
OLED_WR_Byte(0xD3,OLED_CMD);//-set display offset
OLED_WR_Byte(0x00,OLED_CMD);//
OLED_WR_Byte(0xD5,OLED_CMD);//set osc division
OLED_WR_Byte(0x80,OLED_CMD);//
OLED_WR_Byte(0xD8,OLED_CMD);//set area color mode off
OLED_WR_Byte(0x05,OLED_CMD);//
OLED_WR_Byte(0xD9,OLED_CMD);//Set Pre-Charge Period
OLED_WR_Byte(0xF1,OLED_CMD);//
OLED_WR_Byte(0xDA,OLED_CMD);//set com pin configuartion
OLED_WR_Byte(0x12,OLED_CMD);//
OLED_WR_Byte(0xDB,OLED_CMD);//set Vcomh
OLED_WR_Byte(0x30,OLED_CMD);//
OLED_WR_Byte(0x8D,OLED_CMD);//set charge pump enable
OLED_WR_Byte(0x14,OLED_CMD);//
OLED_WR_Byte(0xAF,OLED_CMD);//--turn on oled panel
}

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要使OLED屏进行显示，只有初始化函数当然是不行的，它还需要以下基本函数的支持，它们是：

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();
}
void OLED_WR_Byte(unsigned dat,unsigned cmd)
{
if(cmd)
{
Write_IIC_Data(dat);
}
else
{
Write_IIC_Command(dat);
}
}
void Delay_50ms(unsigned int Del_50ms)
{
unsigned int m;
for(;Del_50ms>0;Del_50ms--)
for(m=6245;m>0;m--);
}
void Delay_1ms(unsigned int Del_1ms)
{
unsigned char j;
while(Del_1ms--)
{
for(j=0;j<123;j++);
}
}
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);
}
}

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此外，要实现字符、数值及字符串的显示，你还需要以下几个函数的配合：

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 ==16)
{
OLED_Set_Pos(x,y);
for(i=0;i<8;i++)
OLED_WR_Byte(F8X16[c*16+i],OLED_DATA);
OLED_Set_Pos(x,y+1);
for(i=0;i<8;i++)
OLED_WR_Byte(F8X16[c*16+i+8],OLED_DATA);
}
else
{
OLED_Set_Pos(x,y);
for(i=0;i<6;i++)
OLED_WR_Byte(F6x8[c][i],OLED_DATA);
}
}
uint32_t oled_pow(unsigned char m,unsigned char n)
{
uint32_t result=1;
while(n--)result*=m;
return result;
}
void OLED_ShowNum(unsigned char x,unsigned char y,uint32_t num,unsigned char len,unsigned char size2)
{
unsigned char t,temp;
unsigned char enshow=0;
for(t=0;t<len;t++)
{
temp=(num/oled_pow(10,len-t-1))%10;
if(enshow==0&&t<(len-1))
{
if(temp==0)
{
OLED_ShowChar(x+(size2/2)*t,y,' ',size2);
continue;
}else enshow=1;
}
OLED_ShowChar(x+(size2/2)*t,y,temp+'0',size2);
}
}
void OLED_ShowString(unsigned char x,unsigned char y,unsigned char *chr,unsigned char Char_Size)
{
unsigned char j=0;
while (chr[j]!='\0')
{ OLED_ShowChar(x,y,chr[j],Char_Size);
x+=8;
if(x>120){x=0;y+=2;}
j++;
}
}

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到现在你才可用主函数来制作出上图的显示效果，主函数的内容如下：

int main(void)
{
HAL_Init();
/* Configure the system clock to 84 MHz */
SystemClock_Config();
/* -1- Enable GPIOA Clock (to be able to program the configuration registers) */
__HAL_RCC_GPIOB_CLK_ENABLE();
/* -2- Configure PA05 IO in output push-pull mode to drive external LED */
GPIO_InitStruct.Pin = GPIO_PIN_7; // LD2 PB7
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
OLED_Init();
OLED_Clear();
OLED_ShowString(2,0,"STM32F413",16);
OLED_ShowString(2,2,"Nucleo-144",16);
OLED_ShowString(2,4,"1.5MB Flash",16);
OLED_ShowString(2,6,"320-KB SRAM",16);
/* -3- Toggle PA05 IO in an infinite loop */
while (1)
{
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_7);
/* Insert delay 100 ms */
HAL_Delay(100);
}
}