Hi3861 OpenHarmony嵌入式应用入门--0.96寸液晶屏 iic驱动ssd1306

news2024/11/29 0:34:39

使用iic驱动ssd1306，代码来源hihope\hispark_pegasus\demo\12_ssd1306

本样例提供了一个HarmonyOS IoT硬件接口的SSD1306 OLED屏驱动库，其功能如下：

内置了128*64 bit的内存缓冲区，支持全屏刷新;
优化了屏幕刷新速率，实测最大帧率10fps;
libm_port

是从musl libc中抽取的 sin和 cos的实现；

用于规避链接Hi3861 SDK中的libm_flash.a报错的问题;
gif2imgs.py

可用于将gif动图中的帧分离出来;

依赖 pillow 包，可以使用 pip install pillow 命令安装；
img2code.py

可用于将图片转为C数组，每个字节表示8个像素；

依赖 opecv-python 包，可以使用 pip install opencv-python 命令安装；
使用Harmony OS的IoT硬件接口;
接口简洁易于使用、易于移植;
内置了测试程序，可直接进行测试;

硬件原理图

IO口定义

I2C API

API名称	说明
I2cInit (WifiIotI2cIdx id, unsigned int baudrate)	用指定的波特速率初始化I2C设备
I2cDeinit (WifiIotI2cIdx id)	取消初始化I2C设备
I2cWrite (WifiIotI2cIdx id, unsigned short deviceAddr, const WifiIotI2cData *i2cData)	将数据写入I2C设备
I2cRead (WifiIotI2cIdx id, unsigned short deviceAddr, const WifiIotI2cData *i2cData)	从I2C设备中读取数据
I2cWriteread (WifiIotI2cIdx id, unsigned short deviceAddr, const WifiIotI2cData *i2cData)	向I2C设备发送数据并接收数据响应
I2cRegisterResetBusFunc (WifiIotI2cIdx id, WifiIotI2cFunc pfn)	注册I2C设备回调
I2cSetBaudrate (WifiIotI2cIdx id, unsigned int baudrate)	设置I2C设备的波特率

ssd1306 API

API名称	说明
void ssd1306_Init(void)	初始化
void ssd1306_Fill(SSD1306_COLOR color)	以指定的颜色填充屏幕
void ssd1306_SetCursor(uint8_t x, uint8_t y)	定位光标
void ssd1306_UpdateScreen(void)	更新屏幕内容
char ssd1306_DrawChar(char ch, FontDef Font, SSD1306_COLOR color)	在屏幕缓冲区绘制1个字符
char ssd1306_DrawString(char* str, FontDef Font, SSD1306_COLOR color)	将完整字符串写入屏幕缓冲区
void ssd1306_DrawPixel(uint8_t x, uint8_t y, SSD1306_COLOR color)	在屏幕缓冲区中绘制一个像素
void ssd1306_DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, SSD1306_COLOR color)	用Bresenhem算法画直线
void ssd1306_DrawPolyline(const SSD1306_VERTEX *par_vertex, uint16_t par_size, SSD1306_COLOR color)	绘制多段线
void ssd1306_DrawRectangle(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, SSD1306_COLOR color)	绘制矩形
void ssd1306_DrawArc(uint8_t x, uint8_t y, uint8_t radius, uint16_t start_angle, uint16_t sweep, SSD1306_COLOR color)	绘图角度
void ssd1306_DrawCircle(uint8_t par_x, uint8_t par_y, uint8_t par_r, SSD1306_COLOR color)	用Bresenhem算法画圆
void ssd1306_DrawBitmap(const uint8_t* bitmap, uint32_t size)	绘图位图
void ssd1306_DrawRegion(uint8_t x, uint8_t y, uint8_t w, uint8_t h, const uint8_t* data, uint32_t size, uint32_t stride)	绘制区域

修改D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\BUILD.gn文件

# Copyright (c) 2023 Beijing HuaQing YuanJian Education Technology Co., Ltd
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#    http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License. 

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

lite_component("demo") {
  features = [
    #"base_00_helloworld:base_helloworld_example",
    #"base_01_led:base_led_example",
    #"base_02_loopkey:base_loopkey_example",
    #"base_03_irqkey:base_irqkey_example",
    #"base_04_adc:base_adc_example",
    #"base_05_pwm:base_pwm_example",
    "base_06_ssd1306:base_ssd1306_example",
  ]
}

将D:\DevEcoProjects\test\src\vendor\hihope\hispark_pegasus\demo\12_ssd1306文件复制到D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\base_06_ssd1306中

修改D:\DevEcoProjects\test\src\vendor\rtplay\rt_hi3861\demo\base_06_ssd1306\BUILD.gn

#Copyright (C) 2021 HiHope Open Source Organization .
#Licensed under the Apache License, Version 2.0 (the "License");
#you may not use this file except in compliance with the License.
#You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
#Unless required by applicable law or agreed to in writing, software
#distributed under the License is distributed on an "AS IS" BASIS,
#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#See the License for the specific language governing permissions and
#
#limitations under the License.

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

lite_component("base_ssd1306_example") {
    features = [
        "ssd1306:oled_ssd1306",
        "examples:oled_test",
        "//third_party/libm_port:libm_port"
    ]
}

目录结构

│  config.json
│
├─common
│  └─bsp
│      ├─include
│      └─src
├─demo
│  │  BUILD.gn
│  │
│  ├─base_00_helloworld
│  │      base_helloworld_example.c
│  │      BUILD.gn
│  │
│  ├─base_01_led
│  │      base_led_example.c
│  │      BUILD.gn
│  │
│  ├─base_02_loopkey
│  │      base_loopkey_example.c
│  │      BUILD.gn
│  │
│  ├─base_03_irqkey
│  │      base_irqkey_example.c
│  │      BUILD.gn
│  │
│  ├─base_04_adc
│  │      base_adc_example.c
│  │      BUILD.gn
│  │
│  ├─base_05_pwm
│  │      base_pwm_example.c
│  │      BUILD.gn
│  │
│  └─base_06_ssd1306
│      │  BUILD.gn
│      │  gif2imgs.py
│      │  img2code.py
│      │  LICENSE
│      │  README.md
│      │  requirements.txt
│      │
│      ├─examples
│      │      BUILD.gn
│      │      ssd1306_demo.c
│      │      ssd1306_tests.c
│      │      ssd1306_tests.h
│      │
│      └─ssd1306
│              BUILD.gn
│              ssd1306.c
│              ssd1306.h
│              ssd1306_conf.h
│
└─doc
    │  HarmonyOS开发板实验指导书 v2.1.pdf
    │  华清远见 FS_Hi3861开发指导.md
    │  华清远见 FS_Hi3861新手入门手册.md
    │
    ├─board
    │      FS-Hi3861-V4.2.pdf
    │      FS-Hi3861QDB-V3.2.pdf
    │      hi-12f_kit_v1.1.0规格书-20211025.pdf
    │      hi-12f_v1.1.2-规格书-20211202.pdf
    │      nodemcu-hi-07s_12f-kit_v1.1-20210913.pdf
    │      RTplay2.01_A1_2024-06-20.pdf
    │
    └─figures

进行编译，编译好如下