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原先用LiteOS點亮過OLED，這次用HarmonyOS點亮OLED

1、在applications/sample/wifi-iot/app下新建myshow文件夾，myshow文件夾下新建myshow.c、oled_ssd1306.c、oled_ssd1306.h、BUILD.gn四個文件。

oled_ssd1306.c為：

#include

#include

#include "ohos_types.h"

#include "iot_errno.h"

#include "iot_i2c.h"

#include "oled_ssd1306.h"

/************************************6*8的點陣************************************/

static unsigned char F6x8[][6] =

  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // sp

  { 0x00, 0x00, 0x00, 0x2f, 0x00, 0x00 }, // !

  { 0x00, 0x00, 0x07, 0x00, 0x07, 0x00 }, // "

  { 0x00, 0x14, 0x7f, 0x14, 0x7f, 0x14 }, // #

  { 0x00, 0x24, 0x2a, 0x7f, 0x2a, 0x12 }, // $

  { 0x00, 0x62, 0x64, 0x08, 0x13, 0x23 }, // %

  { 0x00, 0x36, 0x49, 0x55, 0x22, 0x50 }, // &

  { 0x00, 0x00, 0x05, 0x03, 0x00, 0x00 }, // '

  { 0x00, 0x00, 0x1c, 0x22, 0x41, 0x00 }, // (

  { 0x00, 0x00, 0x41, 0x22, 0x1c, 0x00 }, // )

  { 0x00, 0x14, 0x08, 0x3E, 0x08, 0x14 }, // *

  { 0x00, 0x08, 0x08, 0x3E, 0x08, 0x08 }, // +

  { 0x00, 0x00, 0x00, 0xA0, 0x60, 0x00 }, // ,

  { 0x00, 0x08, 0x08, 0x08, 0x08, 0x08 }, // -

  { 0x00, 0x00, 0x60, 0x60, 0x00, 0x00 }, // .

  { 0x00, 0x20, 0x10, 0x08, 0x04, 0x02 }, // /

  { 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, 0x00, 0x36, 0x36, 0x00, 0x00 }, // :

  { 0x00, 0x00, 0x56, 0x36, 0x00, 0x00 }, // ;

  { 0x00, 0x08, 0x14, 0x22, 0x41, 0x00 }, // <

  { 0x00, 0x14, 0x14, 0x14, 0x14, 0x14 }, // =

  { 0x00, 0x00, 0x41, 0x22, 0x14, 0x08 }, // >

  { 0x00, 0x02, 0x01, 0x51, 0x09, 0x06 }, // ?

  { 0x00, 0x32, 0x49, 0x59, 0x51, 0x3E }, // @

  { 0x00, 0x7C, 0x12, 0x11, 0x12, 0x7C }, // A

  { 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 }, // Z

  { 0x00, 0x00, 0x7F, 0x41, 0x41, 0x00 }, // [

  { 0x00, 0x55, 0x2A, 0x55, 0x2A, 0x55 }, // 55

  { 0x00, 0x00, 0x41, 0x41, 0x7F, 0x00 }, // ]

  { 0x00, 0x04, 0x02, 0x01, 0x02, 0x04 }, // ^

  { 0x00, 0x40, 0x40, 0x40, 0x40, 0x40 }, // _

  { 0x00, 0x00, 0x01, 0x02, 0x04, 0x00 }, // '

  { 0x00, 0x20, 0x54, 0x54, 0x54, 0x78 }, // a

  { 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 }, // x

  { 0x00, 0x1C, 0xA0, 0xA0, 0xA0, 0x7C }, // y

  { 0x00, 0x44, 0x64, 0x54, 0x4C, 0x44 }, // z

  { 0x14, 0x14, 0x14, 0x14, 0x14, 0x14 }, // horiz lines

};

/****************************************8*16的點陣************************************/

static const unsigned char F8X16[]=

  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,// 0

  0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00,//! 1

  0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//" 2

  0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00,//# 3

  0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00,//$ 4

  0xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00,//% 5

  0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10,//& 6

  0x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//' 7

  0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00,//( 8

  0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00,//) 9

  0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00,//* 10

  0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00,//+ 11

  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00,//, 12

  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,//- 13

  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00,//. 14

  0x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00,/// 15

  0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00,//0 16

  0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//1 17

  0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00,//2 18

  0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00,//3 19

  0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00,//4 20

  0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00,//5 21

  0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00,//6 22

  0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00,//7 23

  0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00,//8 24

  0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00,//9 25

  0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,//: 26

  0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00,//; 27

  0x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00,//< 28

  0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00,//= 29

  0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00,//> 30

  0x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00,//? 31

  0xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00,//@ 32

  0x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20,//A 33

  0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00,//B 34

  0xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00,//C 35

  0x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00,//D 36

  0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00,//E 37

  0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00,//F 38

  0xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00,//G 39

  0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20,//H 40

  0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//I 41

  0x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00,//J 42

  0x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00,//K 43

  0x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00,//L 44

  0x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00,//M 45

  0x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00,//N 46

  0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00,//O 47

  0x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00,//P 48

  0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00,//Q 49

  0x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20,//R 50

  0x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00,//S 51

  0x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,//T 52

  0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,//U 53

  0x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00,//V 54

  0xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00,//W 55

  0x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20,//X 56

  0x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,//Y 57

  0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00,//Z 58

  0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00,//[ 59

  0x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00,// 60

  0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00,//] 61

  0x00,0x00,0x04,0x02,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//^ 62

  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,//_ 63

  0x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//` 64

  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20,//a 65

  0x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00,//b 66

  0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00,//c 67

  0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20,//d 68

  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00,//e 69

  0x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//f 70

  0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00,//g 71

  0x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,//h 72

  0x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//i 73

  0x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,//j 74

  0x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00,//k 75

  0x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//l 76

  0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F,//m 77

  0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,//n 78

  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,//o 79

  0x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00,//p 80

  0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80,//q 81

  0x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00,//r 82

  0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00,//s 83

  0x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00,//t 84

  0x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20,//u 85

  0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00,//v 86

  0x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00,//w 87

  0x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00,//x 88

  0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00,//y 89

  0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00,//z 90

  0x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40,//{ 91

  0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,//| 92

  0x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00,//} 93

  0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//~ 94

};

/*---6*6 點陣*/

static const unsigned char F6X6[]=

  0x00,0x1E,0x1E,0x1E,0x1E,0x00, //■

};

/*---8*8 點陣*/

static const unsigned char F8X8[]=

  //0x00,0x7E,0x7E,0x7E,0x7E,0x7E,0x7E,0x00,

  0x7E,0x7E,0x7E,0x7E,0x7E,0x7E,0x7E,0x00, //■

};

#define OLED_I2C_IDX    0

#define OLED_I2C_BAUDRATE  (400*1000) // 400k

#define OLED_I2C_ADDR    0x78    // 默認地址為 0x78

#define OLED_I2C_CMD    0x00    // 0000 0000    寫命令

#define OLED_I2C_DATA    0x40    // 0100 0000(0x40) 寫數據

#define OLED_WIDTH     (128)

#define SNAKE_CLEAR_BLOCK 0x00

static uint32 OledWriteByte(uint8 regAddr, uint8 byte)

 // TODO: Check SSD1306 DataSheet if must write by byte.

  uint8 buffer[] = {regAddr, byte};

 return IoTI2cWrite(OLED_I2C_IDX, OLED_I2C_ADDR, buffer, ARRAY_SIZE(buffer));

/**

 * [url=home.php?mod=space&uid=2666770]@Brief[/url] Write a command byte to OLED device.

 * [url=home.php?mod=space&uid=3142012]@param[/url] cmd the commnad byte to be writen.

 * [url=home.php?mod=space&uid=1141835]@Return[/url] Returns {[url=home.php?mod=space&uid=41289]@Link[/url] WIFI_IOT_SUCCESS} if the operation is successful;

 * returns an error code defined in {@link wifiiot_errno.h} otherwise.

*/

static uint32 OledWriteCmd(uint8 cmd)

  return OledWriteByte(OLED_I2C_CMD, cmd);

/**

 * @brief Write a data byte to OLED device.

 * @param cmd the data byte to be writen.

 * @return Returns {@link WIFI_IOT_SUCCESS} if the operation is successful;

 * returns an error code defined in {@link wifiiot_errno.h} otherwise.

*/

static uint32 OledWriteData(uint8 data)

 return OledWriteByte(OLED_I2C_DATA, data);

/**

 * @brief ssd1306 OLED Initialize.

*/

uint32 OledInit(void)

  static const uint8 initCmds[] = {

    0xAE, // --display off

    0x00, // ---set low column address

    0x10, // ---set high column address

    0x40, // --set start line address

    0xB0, // --set page address

    0x81, // contract control

    0xFF, // --128

    0xA1, // set segment remap

    0xA6, // --normal / reverse

    0xA8, // --set multiplex ratio(1 to 64)

    0x3F, // --1/32 duty

    0xC8, // Com scan direction

    0xD3, // -set display offset

    0x00, //

    0xD5, // set osc division

    0x80, //

    0xD8, // set area color mode off

    0x05, //

    0xD9, // Set Pre-Charge Period

    0xF1, //

    0xDA, // set com pin configuartion

    0x12, //

    0xDB, // set Vcomh

    0x30, //

    0x8D, // set charge pump enable

    0x14, //

    0xAF, // --turn on oled panel

};

  IoTI2cInit(OLED_I2C_IDX, OLED_I2C_BAUDRATE);

 for (uint32 i = 0; i < ARRAY_SIZE(initCmds); i++) {

    uint32 status = OledWriteCmd(initCmds[i]);

    if (status != IOT_SUCCESS) {

      return status;

  return IOT_SUCCESS;

void OledSetPosition(uint8 x, uint8 y)

  OledWriteCmd(0xb0 + y);

  OledWriteCmd(((x & 0xf0) >> 4) | 0x10);

  OledWriteCmd(x & 0x0f);

void OledFillScreen(uint8 fillData)

  uint8 m = 0;

  uint8 n = 0;

  for (m=0; m < 8; m++) {

    OledWriteCmd(0xb0 + m);

    OledWriteCmd(0x00);

    OledWriteCmd(0x10);

    for (n=0; n < 128; n++) {

      OledWriteData(fillData);

/**

 * @brief 8*16 typeface

 * @param x: write positon start from x axis

 * @param y: write positon start from y axis

 * @param ch: write data

 * @param font: selected font

*/

void OledShowChar(uint8 x, uint8 y, uint8 ch, Font font)

 uint8 c = 0;

  uint8 i = 0;

  c = ch - ' '; //得到偏移后的值

  if (x > OLED_WIDTH - 1) {

    x = 0;

    y = y + 2;

  if (font == FONT8x16) {

    OledSetPosition(x, y);

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

      OledWriteData(F8X16[c*16 + i]);

    OledSetPosition(x, y+1);

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

      OledWriteData(F8X16[c*16 + i + 8]);

  }else {

    OledSetPosition(x, y);

    for (i = 0; i < 6; i++) {

      OledWriteData(F6x8[c][i]);

void OledShowString(uint8 x, uint8 y, const char* str, Font font)

 uint8 j = 0;

  if (str == NULL) {

    printf("param is NULL,Please check!!!

");

    return;

 while (str[j]) {

    OledShowChar(x, y, str[j], font);

    x += 8;

    if (x > 120)

      x = 0;

      y += 2;

    j++;

oled_ssd1306.h：

#ifndef OLED_SSD1306_H

#define OLED_SSD1306_H

#include "ohos_types.h"

/**

 * @brief ssd1306 OLED Initialize.

*/

uint32 OledInit(void);

/**

 * @brief Set cursor position

 * @param x the horizontal posistion of cursor

 * @param y the vertical position of cursor

 * @return Returns {@link WIFI_IOT_SUCCESS} if the operation is successful;

 * returns an error code defined in {@link wifiiot_errno.h} otherwise.

*/

void OledSetPosition(uint8 x, uint8 y);

void OledFillScreen(uint8 fillData);

enum Font {

  FONT6x8 = 1,

  FONT8x16

};

typedef enum Font Font;

enum DisOnOff{

 DISOFF,

 DISON

};

typedef enum DisOnOff DisOnOff;

void OledShowChar(uint8 x, uint8 y, uint8 ch, Font font);

void OledShowString(uint8 x, uint8 y, const char* str, Font font);

void PrintBlock(uint8 x0, uint8 y0);

void DisplayBlock(uint8 x0, uint8 y0);

#endif // OLED_SSD1306_H

myshow.c：

#include

#include

#include "ohos_init.h"

#include "cmsis_os2.h"

#include "iot_gpio.h"

#include "oled_ssd1306.h"

void mymain(void)

  OledInit();

  OledFillScreen(0x00);

  OledShowString(26, 2, "HELLO WORLD!", FONT8x16);

SYS_RUN(mymain);

myshow/BUILD.gn：

static_library("myshow") {

 sources = [

  "oled_ssd1306.c",

  "myshow.c",

 include_dirs = [

   "http://utils/native/lite/include",

   "http://kernel/liteos_m/kal/cmsis",

   "http://base/iot_hardware/peripheral/interfaces/kits",

然后修改app/BUILD.gn：

import("http://build/lite/config/component/lite_component.gni")

lite_component("app") {

  features = [

    # "demo_snake",

    "myshow:myshow",

  deps = []

保存后編譯：

然后把生成的Hi3861_wifiiot_app_allinone.bin用HiBurn工具下載到開發板：

下載完成后OLED顯示如下圖：

聲明：本文內容及配圖由入駐作者撰寫或者入駐合作網站授權轉載。文章觀點僅代表作者本人，不代表電子發燒友網立場。文章及其配圖僅供工程師學習之用，如有內容侵權或者其他違規問題，請聯系本站處理。舉報投訴

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