STM32 SPI通信--OLED

一、0.96寸OLED

二、原理圖

二、GPIO模擬SPI

1. 硬件連接

通過(guò)引腳和模塊電路圖可以分析出SPI的電路連接

OLED STM32

GND <----------> GND

VCC <----------> 3.3V

D0 <----------> PA4(CLK)

D1 <----------> PA3(MOSI)

RES <----------> PA2(RET復(fù)位)

DC <----------> PA1(命令|數(shù)據(jù)dc)

CS <----------> GND

2. 軟件驅(qū)動(dòng)

由OLED模塊數(shù)據(jù)手冊(cè)上SPI的操作時(shí)序圖寫(xiě)出由GPIO口模擬的SPI驅(qū)動(dòng)代碼，模塊只支持向模塊寫(xiě)數(shù)據(jù)不能讀數(shù)據(jù)，所以只需要寫(xiě)SPI發(fā)送即可

2.1 “SPI.h”

#define OLED_CMD 0 //命令聲明

#define OLED_DATA 1 //數(shù)據(jù)聲明

#define OLED_CLK PAout(4) // CLK時(shí)鐘 d0

#define OLED_MOSI PAout(3) // MOSI d1

#define OLED_RST PAout(2) // RET復(fù)位 ret

#define OLED_DC PAout(1) // 命令|數(shù)據(jù) dc （0表傳輸命令1表傳輸數(shù)據(jù)）

void OLED_SPI_Init(void); //配置MCU的SPI

void SPI_WriteByte(uint8_t addr,uint8_t data); //向寄存器地址寫(xiě)一個(gè)byte的數(shù)據(jù)

void WriteCmd(unsigned char cmd); //寫(xiě)命令

void WriteDat(unsigned char data); //寫(xiě)數(shù)據(jù)

2.2 “SPI.c”

void OLED_SPI_Init(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA ,ENABLE);//使能PA端口時(shí)鐘

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4; //端口配置

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;//推挽輸出

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;//IO口速度為50MHz

GPIO_Init(GPIOA,&GPIO_InitStructure);//根據(jù)設(shè)定參數(shù)初始化GPIOA

}

void SPI_WriteByte(unsigned char data,unsigned char cmd)

{

unsigned char i=0;

OLED_DC =cmd;

OLED_CLK=0;

for(i=0;i<8;i++)

{

OLED_CLK=0;

if(data&0x80)OLED_MOSI=1; //從高位到低位

else OLED_MOSI=0;

OLED_CLK=1;

data<<=1;

}

OLED_CLK=1;

OLED_DC=1;

}

void WriteCmd(unsigned char cmd)

{

SPI_WriteByte(cmd,OLED_CMD);

}

void WriteData(unsigned char data)

{

SPI_WriteByte(data,OLED_DATA);

}

三、STM32對(duì)OLED模塊的控制

3.1 指令集

3.2 “OLED.h”

void OLED_Init(void);//初始化OLED

void OLED_ON(void);//喚醒OLED

void OLED_OFF(void);//OLED休眠

void OLED_Refresh_Gram(void);//更新顯存到OLED

void OLED_Clear(void);//清屏

void OLED_DrawPoint(u8 x,u8 y,u8 t);//畫(huà)點(diǎn)

void OLED_Fill(u8 x1,u8 y1,u8 x2,u8 y2,u8 dot);//填充

void OLED_ShowChar(u8 x,u8 y,u8 chr,u8 size,u8 mode);//顯示字符

void OLED_ShowNum(u8 x,u8 y,u32 num,u8 len,u8 size);//顯示2個(gè)數(shù)字

void OLED_ShowString(u8 x,u8 y,const u8 *p,u8 size);//顯示字符串

3.3 “OLED.c”

//OLED的顯存

//存放格式如下.

//[0]0 1 2 3 ... 127

//[1]0 1 2 3 ... 127

//[2]0 1 2 3 ... 127

//[3]0 1 2 3 ... 127

//[4]0 1 2 3 ... 127

//[5]0 1 2 3 ... 127

//[6]0 1 2 3 ... 127

//[7]0 1 2 3 ... 127

u8 OLED_GRAM[128][8];

void OLED_DLY_ms(unsigned int ms)

{

unsigned int a;

while(ms)

{

a=1335;

while(a--);

ms--;

}

}

void OLED_Init(void)

{

OLED_SPI_Init();

OLED_CLK = 1;

OLED_RST = 0;

OLED_DLY_ms(100);

OLED_RST = 1;

//從上電到下面開(kāi)始初始化要有足夠的時(shí)間，即等待RC復(fù)位完畢

WriteCmd(0xAE); // Display Off (0x00)

WriteCmd(0xD5);

WriteCmd(0x80); // Set Clock as 100 Frames/Sec

WriteCmd(0xA8);

WriteCmd(0x3F); // 1/64 Duty (0x0F~0x3F)

WriteCmd(0xD3);

WriteCmd(0x00); // Shift Mapping RAM Counter (0x00~0x3F)

WriteCmd(0x40 | 0x00); // Set Mapping RAM Display Start Line (0x00~0x3F)

WriteCmd(0x8D);

WriteCmd(0x10 | 0x04); // Enable Embedded DC/DC Converter (0x00/0x04)

WriteCmd(0x20);

WriteCmd(0x02); // Set Page Addressing Mode (0x00/0x01/0x02)

WriteCmd(0xA0 | 0x01); // Set SEG/Column Mapping

WriteCmd(0xC0); // Set COM/x Scan Direction

WriteCmd(0xDA);

WriteCmd(0x02 | 0x10); // Set Sequential Configuration (0x00/0x10)

WriteCmd(0x81);

WriteCmd(0xCF); // Set SEG Output Current

WriteCmd(0xD9);

WriteCmd(0xF1); // Set Pre-Charge as 15 Clocks & Discharge as 1 Clock

WriteCmd(0xDB);

WriteCmd(0x40); // Set VCOM Deselect Level

WriteCmd(0xA4 | 0x00); // Disable Entire Display On (0x00/0x01)

WriteCmd(0xA6 | 0x00); // Disable Inverse Display On (0x00/0x01)

WriteCmd(0xAE | 0x01); // Display On (0x01)

OLED_Clear(); //初始清屏

}

void OLED_ON(void)

{

WriteCmd(0X8D); //設(shè)置電荷泵

WriteCmd(0X14); //開(kāi)啟電荷泵

WriteCmd(0XAF); //OLED喚醒

}

void OLED_OFF(void)

{

WriteCmd(0X8D); //設(shè)置電荷泵

WriteCmd(0X10); //關(guān)閉電荷泵

WriteCmd(0XAE); //OLED休眠

}

void OLED_Refresh_Gram(void)

{

u8 i,n;

for(i=0;i<8;i++)

{

WriteCmd(0xb0+i); //設(shè)置頁(yè)地址（0~7）

WriteCmd(0x00); //設(shè)置顯示位置—列低地址

WriteCmd(0x10); //設(shè)置顯示位置—列高地址

for(n=0;n<128;n++)WriteData(OLED_GRAM[n][i]);

}

}

void OLED_Clear(void)

{

u8 i,n;

for(i=0;i<8;i++)for(n=0;n<128;n++)OLED_GRAM[n][i]=0X00;

OLED_Refresh_Gram();//更新顯示

}

void OLED_DrawPoint(u8 x,u8 y,u8 t)

{

u8 pos,bx,temp=0;

if(x>127||y>63)return;//超出范圍了.

pos=7-y/8;

bx=y%8;

temp=1<<(7-bx);

if(t)OLED_GRAM[x][pos]|=temp;

else OLED_GRAM[x][pos]&=~temp;

}

void OLED_Fill(u8 x1,u8 y1,u8 x2,u8 y2,u8 dot)

{

u8 x,y;

for(x=x1;x<=x2;x++)

{

for(y=y1;y<=y2;y++)OLED_DrawPoint(x,y,dot);

}

OLED_Refresh_Gram();//更新顯示

}

void OLED_ShowChar(u8 x,u8 y,u8 chr,u8 size,u8 mode)

{

u8 temp,t,t1;

u8 y0=y;

u8 csize=(size/8+((size%8)?1:0))*(size/2); //得到字體一個(gè)字符對(duì)應(yīng)點(diǎn)陣集所占的字節(jié)數(shù)

chr=chr-&#