【HarmonyOS HiSpark Wi-Fi IoT 套件试用连载】点亮OLED - HarmonyOS技术社区 - 电子技术论坛

2022-08-12 23:16:23

HarmonyOS OLED

原先用LiteOS点亮过OLED，这次用HarmonyOS点亮OLED

1、在applications/sample/wifi-iot/app下新建myshow文件夹，myshow文件夹下新建myshow.c、oled_ssd1306.c、oled_ssd1306.h、BUILD.gn四个文件。

oled_ssd1306.c为：

#include <stdio.h>
#include <unistd.h>

#include "ohos_types.h"
#include "iot_errno.h"
#include "iot_i2c.h"


#include "oled_ssd1306.h"

/************************************6*8的点阵************************************/
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的点阵************************************/
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 点阵*/
static const unsigned char F6X6[]=
{
    0x00,0x1E,0x1E,0x1E,0x1E,0x00, //■
};

/*---8*8 点阵*/
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        // 默认地址为 0x78
#define OLED_I2C_CMD        0x00        // 0000 0000       写命令
#define OLED_I2C_DATA       0x40        // 0100 0000(0x40) 写数据
#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 <stdio.h>

#include <unistd.h>

#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 = [
      "//utils/native/lite/include",
      "//kernel/liteos_m/kal/cmsis",
      "//base/iot_hardware/peripheral/interfaces/kits",
  ]
}

然后修改app/BUILD.gn:

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

lite_component("app") {
    features = [
        # "demo_snake",
        "myshow:myshow",
    ]
    deps = []
}

保存后编译：

然后把生成的Hi3861_wifiiot_app_allinone.bin用HiBurn工具下载到开发板：

下载完成后OLED显示如下图：

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