树梅派硬件编程_QT_OLED显示字符
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OLED显示字符
树梅派I2C使用
安装i2c tools
sudo apt-get install i2c-tools
检查i2c设备
pi@raspberrypi:~ $ sudo i2cdetect -l
i2c-1 i2c bcm2835 (i2c@7e804000) I2C adapter
pi@raspberrypi:~ $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
pi@raspberrypi:~ $
0x3c 则为该设备地址
SSD1306OLed的使用
-
SSD1306支持多种控制方式，I2C、6800、8080、4线SPI、3线SPI，通过BS0、BS1、BS2引脚接不同的电平来选择控制方式. 使用I2C，则BS0接GND、BS1接VCC、BS2接GND
-
根据0.96寸OLED使用说明可知控制信号是后五位，对于I2C协议来说后两位SA0指的的此设备的设备号。可理解为0x00寄存器是对0LED屏幕进行控制命令写入，0x40寄存器是对OLED屏幕数据写入。
-
OLED 0.96寸为 64行,128列 ,从上至下一共8页, 每页上面4位低位,下面4位高位.
传输时,一个一个字节传, 传入一个字节就是画一个列.
传输时,先要定位在哪一行或页的哪一列开始画,画完一列会自动开始下一列绘制.
字模
字符大小为6列,每列8位(一个字节)
例如:
//'0'-48, 'A'-(65-10)55 'a'-(97-36)61
static unsigned char F68[][6] =
{
{0x00, 0x3E, 0x51, 0x49, 0x45, 0x3E},// 0
{0x00, 0x00, 0x42, 0x7F, 0x40, 0x00},// 1
{0x00, 0x42, 0x61, 0x51, 0x49, 0x46},// 2
{0x00, 0x21, 0x41, 0x45, 0x4B, 0x31},// 3
{0x00, 0x18, 0x14, 0x12, 0x7F, 0x10},// 4
{0x00, 0x27, 0x45, 0x45, 0x45, 0x39},// 5
{0x00, 0x3C, 0x4A, 0x49, 0x49, 0x30},// 6
{0x00, 0x01, 0x71, 0x09, 0x05, 0x03},// 7
{0x00, 0x36, 0x49, 0x49, 0x49, 0x36},// 8
{0x00, 0x06, 0x49, 0x49, 0x29, 0x1E},// 9
};
命令写入和数据写入
//写命令
void WriteCmd(int fd,unsigned char I2C_Command)
{
wiringPiI2CWriteReg8(fd,0x00, I2C_Command);
//往0x00寄存器写入数据，数据为命令
}
void WriteData(int fd, unsigned char I2C_Data)//写数据
{
wiringPiI2CWriteReg8(fd, 0x40, I2C_Data);
//往0x40寄存器写入数据，数据为图像信息
}
定位开始写入地址
void OLED_SetPos(int fd, unsigned char x, unsigned char y) //设置起始点坐标
{
//WriteCmd(fd, (unsigned char)(0x40 + x)); /*设置开始行*/
WriteCmd(fd, (unsigned char)(0xb0 + y)); /*设置开始页*/
WriteCmd(fd, ((x & 0x0f) | 0x00));//LOW
WriteCmd(fd, (((x & 0xf0) >> 4) | 0x10));//HIGHT
}
写入字符
void OLED_Char(int fd, unsigned char x, unsigned char y, char curChar)
{
//OLED_SetPos(fd,x%128,y+x/128);
OLED_SetPos(fd,x,y);
if(curChar>='0'&&curChar<='9')
{
for (int i=0;i<6;++i) {
WriteData(fd,F68[curChar-48][i]);
}
}
else{
if(curChar>='A'&&curChar<='Z')
{
for (int i=0;i<6;++i) {
WriteData(fd,F68[curChar-55][i]);
}
}
else{
if(curChar>='a'&&curChar<='z')
{
for (int i=0;i<6;++i) {
WriteData(fd,F68[curChar-61][i]);
}
}else {
if(curChar == 32){//空格
for (int i=0;i<6;++i) {
WriteData(fd,F68[62][i]);
}
}
}
}
}
}
字符串
void MainWindow::on_btnshow_clicked()
{
OLED_DisplayOn(i2cfd);
QString text = ui->lineEdit->text();
for (int i=0;i<text.size();++i) {
OLED_Char(i2cfd,i*6,1,text[i].cell());
}
}
清屏
void OLED_CLR(int fd)//清屏
{
OLED_SetPos(fd,0,0);
for (int i=0;i<8;++i) {
for (int j=0;j<128;++j) {
WriteData(fd,0x00);
}
}
显示和关闭
void OLED_DisplayOff(int fd)
{
WriteCmd(fd,0x8D);
WriteCmd(fd,0x10);
WriteCmd(fd,0xAE);
}
void OLED_DisplayOn(int fd)
{
WriteCmd(fd,0x8D);
WriteCmd(fd,0x14);
WriteCmd(fd,0xAF);
}
所有代码
界面:
OLED头文件
#ifndef __OLED_H__
#define __OLED_H__
#include <wiringPi.h>
#include <wiringPiI2C.h>
#include <string.h>
#define I2C_ADDR 0x3c//通过查找I2C设备获得地址
//char DataBuffer[8][128]={0};
//'0'-48, 'A'-(65-10)55 'a'-(97-36)61
static unsigned char F68[][6] =
{
{0x00, 0x3E, 0x51, 0x49, 0x45, 0x3E},// 0
{0x00, 0x00, 0x42, 0x7F, 0x40, 0x00},// 1
{0x00, 0x42, 0x61, 0x51, 0x49, 0x46},// 2
{0x00, 0x21, 0x41, 0x45, 0x4B, 0x31},// 3
{0x00, 0x18, 0x14, 0x12, 0x7F, 0x10},// 4
{0x00, 0x27, 0x45, 0x45, 0x45, 0x39},// 5
{0x00, 0x3C, 0x4A, 0x49, 0x49, 0x30},// 6
{0x00, 0x01, 0x71, 0x09, 0x05, 0x03},// 7
{0x00, 0x36, 0x49, 0x49, 0x49, 0x36},// 8
{0x00, 0x06, 0x49, 0x49, 0x29, 0x1E},// 9
{0x00, 0x7C, 0x12, 0x11, 0x12, 0x7C},// A10
{0x00, 0x7F, 0x49, 0x49, 0x49, 0x36},// B
{0x00, 0x3E, 0x41, 0x41, 0x41, 0x22},// C
{0x00, 0x7F, 0x41, 0x41, 0x22, 0x1C},// D
{0x00, 0x7F, 0x49, 0x49, 0x49, 0x41},// E
{0x00, 0x7F, 0x09, 0x09, 0x09, 0x01},// F
{0x00, 0x3E, 0x41, 0x49, 0x49, 0x7A},// G
{0x00, 0x7F, 0x08, 0x08, 0x08, 0x7F},// H
{0x00, 0x00, 0x41, 0x7F, 0x41, 0x00},// I
{0x00, 0x20, 0x40, 0x41, 0x3F, 0x01},// J
{0x00, 0x7F, 0x08, 0x14, 0x22, 0x41},// K
{0x00, 0x7F, 0x40, 0x40, 0x40, 0x40},// L
{0x00, 0x7F, 0x02, 0x0C, 0x02, 0x7F},// M
{0x00, 0x7F, 0x04, 0x08, 0x10, 0x7F},// N
{0x00, 0x3E, 0x41, 0x41, 0x41, 0x3E},// O
{0x00, 0x7F, 0x09, 0x09, 0x09, 0x06},// P
{0x00, 0x3E, 0x41, 0x51, 0x21, 0x5E},// Q
{0x00, 0x7F, 0x09, 0x19, 0x29, 0x46},// R
{0x00, 0x46, 0x49, 0x49, 0x49, 0x31},// S
{0x00, 0x01, 0x01, 0x7F, 0x01, 0x01},// T
{0x00, 0x3F, 0x40, 0x40, 0x40, 0x3F},// U
{0x00, 0x1F, 0x20, 0x40, 0x20, 0x1F},// V
{0x00, 0x3F, 0x40, 0x38, 0x40, 0x3F},// W
{0x00, 0x63, 0x14, 0x08, 0x14, 0x63},// X
{0x00, 0x07, 0x08, 0x70, 0x08, 0x07},// Y
{0x00, 0x61, 0x51, 0x49, 0x45, 0x43},// Z35
{0x00, 0x20, 0x54, 0x54, 0x54, 0x78},// a36
{0x00, 0x7F, 0x48, 0x44, 0x44, 0x38},// b
{0x00, 0x38, 0x44, 0x44, 0x44, 0x20},// c
{0x00, 0x38, 0x44, 0x44, 0x48, 0x7F},// d
{0x00, 0x38, 0x54, 0x54, 0x54, 0x18},// e
{0x00, 0x08, 0x7E, 0x09, 0x01, 0x02},// f
{0x00, 0x18, 0xA4, 0xA4, 0xA4, 0x7C},// g
{0x00, 0x7F, 0x08, 0x04, 0x04, 0x78},// h
{0x00, 0x00, 0x44, 0x7D, 0x40, 0x00},// i
{0x00, 0x40, 0x80, 0x84, 0x7D, 0x00},// j
{0x00, 0x7F, 0x10, 0x28, 0x44, 0x00},// k
{0x00, 0x00, 0x41, 0x7F, 0x40, 0x00},// l
{0x00, 0x7C, 0x04, 0x18, 0x04, 0x78},// m
{0x00, 0x7C, 0x08, 0x04, 0x04, 0x78},// n
{0x00, 0x38, 0x44, 0x44, 0x44, 0x38},// o
{0x00, 0xFC, 0x24, 0x24, 0x24, 0x18},// p
{0x00, 0x18, 0x24, 0x24, 0x18, 0xFC},// q
{0x00, 0x7C, 0x08, 0x04, 0x04, 0x08},// r
{0x00, 0x48, 0x54, 0x54, 0x54, 0x20},// s
{0x00, 0x04, 0x3F, 0x44, 0x40, 0x20},// t
{0x00, 0x3C, 0x40, 0x40, 0x20, 0x7C},// u
{0x00, 0x1C, 0x20, 0x40, 0x20, 0x1C},// v
{0x00, 0x3C, 0x40, 0x30, 0x40, 0x3C},// w
{0x00, 0x44, 0x28, 0x10, 0x28, 0x44},树梅派硬件编程_按键中断