ESP32移植Openharmony外设篇（3）OLED屏

模块简介

产品介绍

OLED (Organic Light-Emitting Diode)：有机发光二极管又称为有机电激光显示，OLED显示技术具有自发光的特性，采用薄的有机材料涂层和玻璃基板，当有电流通过时，这些有机材料就会发光，而且OLED显示屏幕可视角度大，功耗低。OLED由于同时具备自发光、不需背光源(只上电是不会亮的，驱动程序和接线正确才会点亮)、对比度高、厚度薄、视角广、反应速度快、可用于挠曲面板、使用温度范围广、结构及制程简单等优异之特性，被认为是下一代的平面显示器新兴应用技术。

电气参数

模块尺寸

23.7 *23.8mm

电源电压

3.3-5.5V

驱动芯片

SSD1306

OLED屏幕原理

OLED本身是没有显存的，他的现存是依赖SSD1306提供的，而SSD1306提供一块显存。

SSD1306显存总共为128*64bit大小，SSD1306将这些显存分成了8页。每页包含了128个字节。

单片机内部建立一个缓存(共128*8个字节），每次修改的时候，只是修改单片机上的缓存(实际上就是SRAM)，修改完后一次性把STM32上的缓存数据写入到OLED的GRAM。这个方法也有坏处，对于SRAM很小的单片机（51系列）就比较麻烦。

原理图

取字模

因为OLED屏显示的逻辑是根据一个十六进制数 一个点一个点的点亮对应值为1的像素点，网上有很多取字模的网站，这里推荐一个自己使用的取字模的网址：

汉字字模在线： https://www.23bei.com/tool-223.html

参考代码

BUILD.gn
# Copyright (c) 2022 Hunan OpenValley Digital Industry Development 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("//kernel/liteos_m/liteos.gni")
module_name = get_path_info(rebase_path("."), "name")
kernel_module(module_name){include_dirs = ["//drivers/hdf_core/framework/include/platform/","//drivers/hdf_core/framework/include/utils/","//drivers/hdf_core/framework/support/platform/include/gpio","//drivers/hdf_core/adapter/khdf/liteos_m/osal/include/","//drivers/hdf_core/framework/include/core/","//drivers/hdf_core/framework/include/osal/","//device/soc/esp/esp32/components/driver/include","//device/soc/esp/esp32/components/esp_adc_cal/include","//device/soc/esp/esp32/components/driver/esp32/include",]sources = ["ssd1306.c","ssd1306_fonts.c","ssd1306_demo.c","ssd1306_tests.c",]
}
ssd1306.c
#include "ssd1306.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>  // For memcpy#include <stdio.h>
#include <unistd.h>
#include "cmsis_os2.h"
#include <stdio.h>
#include "cmsis_os2.h"
#include "ohos_run.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "esp_log.h"
#include "driver/gpio.h"
#include "driver/i2c.h"#if defined(SSD1306_USE_I2C)#define SSD1306_I2C_IDX     0#define SSD1306_CTRL_CMD 0x00
#define SSD1306_CTRL_DATA 0x40
#define SSD1306_MASK_CONT (0x1<<7)void ssd1306_Reset(void) {/* for I2C - do nothing */
}void HAL_Delay(uint32_t ms)
{usleep(ms * 1000);
}static uint32_t ssd1306_SendData(uint8_t* data, size_t size)
{int i;i2c_cmd_handle_t cmd_handle = i2c_cmd_link_create();i2c_master_start(cmd_handle);i2c_master_write_byte(cmd_handle, SSD1306_I2C_ADDR, true);for(i = 0; i < size; i ++){i2c_master_write_byte(cmd_handle, data[i], true);}i2c_master_stop(cmd_handle);esp_err_t error = i2c_master_cmd_begin(I2C_NUM_0,cmd_handle,100/portTICK_PERIOD_MS);i2c_cmd_link_delete(cmd_handle);return error;
}static uint32_t ssd1306_WiteByte(uint8_t regAddr, uint8_t byte)
{uint8_t buffer[] = {regAddr, byte};return ssd1306_SendData(buffer, sizeof(buffer));
}// Send a byte to the command register
void ssd1306_WriteCommand(uint8_t byte) {ssd1306_WiteByte(SSD1306_CTRL_CMD, byte);
}// Send data
void ssd1306_WriteData(uint8_t* buffer, size_t buff_size) {uint8_t data[SSD1306_WIDTH * 2] = {0};for (size_t i = 0; i < buff_size; i++) {data[i*2] = SSD1306_CTRL_DATA | SSD1306_MASK_CONT;data[i*2+1] = buffer[i];}data[(buff_size - 1) * 2] = SSD1306_CTRL_DATA;ssd1306_SendData(data, sizeof(data));
}#elif defined(SSD1306_USE_SPI)void ssd1306_Reset(void) {// CS = High (not selected)HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET);// Reset the OLEDHAL_GPIO_WritePin(SSD1306_Reset_Port, SSD1306_Reset_Pin, GPIO_PIN_RESET);HAL_Delay(10);HAL_GPIO_WritePin(SSD1306_Reset_Port, SSD1306_Reset_Pin, GPIO_PIN_SET);HAL_Delay(10);
}// Send a byte to the command register
void ssd1306_WriteCommand(uint8_t byte) {HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_RESET); // select OLEDHAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_RESET); // commandHAL_SPI_Transmit(&SSD1306_SPI_PORT, (uint8_t *) &byte, 1, HAL_MAX_DELAY);HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET); // un-select OLED
}// Send data
void ssd1306_WriteData(uint8_t* buffer, size_t buff_size) {HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_RESET); // select OLEDHAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_SET); // dataHAL_SPI_Transmit(&SSD1306_SPI_PORT, buffer, buff_size, HAL_MAX_DELAY);HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET); // un-select OLED
}#else
#error "You should define SSD1306_USE_SPI or SSD1306_USE_I2C macro"
#endif// Screenbuffer
static uint8_t SSD1306_Buffer[SSD1306_BUFFER_SIZE];// Screen object
static SSD1306_t SSD1306;/* Fills the Screenbuffer with values from a given buffer of a fixed length */
SSD1306_Error_t ssd1306_FillBuffer(uint8_t* buf, uint32_t len) {SSD1306_Error_t ret = SSD1306_ERR;if (len <= SSD1306_BUFFER_SIZE) {memcpy(SSD1306_Buffer,buf,len);ret = SSD1306_OK;}return ret;
}// Initialize the oled screen
void ssd1306_Init(void) {// Reset OLEDssd1306_Reset();// Wait for the screen to bootHAL_Delay(100);// Init OLEDssd1306_SetDisplayOn(0); //display offssd1306_WriteCommand(0x20); //Set Memory Addressing Modessd1306_WriteCommand(0x00); // 00b,Horizontal Addressing Mode; 01b,Vertical Addressing Mode;// 10b,Page Addressing Mode (RESET); 11b,Invalidssd1306_WriteCommand(0xB0); //Set Page Start Address for Page Addressing Mode,0-7#ifdef SSD1306_MIRROR_VERTssd1306_WriteCommand(0xC0); // Mirror vertically
#elsessd1306_WriteCommand(0xC8); //Set COM Output Scan Direction
#endifssd1306_WriteCommand(0x00); //---set low column addressssd1306_WriteCommand(0x10); //---set high column addressssd1306_WriteCommand(0x40); //--set start line address - CHECKssd1306_SetContrast(0xFF);#ifdef SSD1306_MIRROR_HORIZssd1306_WriteCommand(0xA0); // Mirror horizontally
#elsessd1306_WriteCommand(0xA1); //--set segment re-map 0 to 127 - CHECK
#endif#ifdef SSD1306_INVERSE_COLORssd1306_WriteCommand(0xA7); //--set inverse color
#elsessd1306_WriteCommand(0xA6); //--set normal color
#endif// Set multiplex ratio.
#if (SSD1306_HEIGHT == 128)// Found in the Luma Python lib for SH1106.ssd1306_WriteCommand(0xFF);
#elsessd1306_WriteCommand(0xA8); //--set multiplex ratio(1 to 64) - CHECK
#endif#if (SSD1306_HEIGHT == 32)ssd1306_WriteCommand(0x1F); //
#elif (SSD1306_HEIGHT == 64)ssd1306_WriteCommand(0x3F); //
#elif (SSD1306_HEIGHT == 128)ssd1306_WriteCommand(0x3F); // Seems to work for 128px high displays too.
#else
#error "Only 32, 64, or 128 lines of height are supported!"
#endifssd1306_WriteCommand(0xA4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM contentssd1306_WriteCommand(0xD3); //-set display offset - CHECKssd1306_WriteCommand(0x00); //-not offsetssd1306_WriteCommand(0xD5); //--set display clock divide ratio/oscillator frequencyssd1306_WriteCommand(0xF0); //--set divide ratiossd1306_WriteCommand(0xD9); //--set pre-charge periodssd1306_WriteCommand(0x11); // 0x22 by defaultssd1306_WriteCommand(0xDA); //--set com pins hardware configuration - CHECK
#if (SSD1306_HEIGHT == 32)ssd1306_WriteCommand(0x02);
#elif (SSD1306_HEIGHT == 64)ssd1306_WriteCommand(0x12);
#elif (SSD1306_HEIGHT == 128)ssd1306_WriteCommand(0x12);
#else
#error "Only 32, 64, or 128 lines of height are supported!"
#endifssd1306_WriteCommand(0xDB); //--set vcomhssd1306_WriteCommand(0x30); //0x20,0.77xVcc, 0x30,0.83xVccssd1306_WriteCommand(0x8D); //--set DC-DC enablessd1306_WriteCommand(0x14); //ssd1306_SetDisplayOn(1); //--turn on SSD1306 panel// Clear screenssd1306_Fill(Black);// Flush buffer to screenssd1306_UpdateScreen();// Set default values for screen objectSSD1306.CurrentX = 0;SSD1306.CurrentY = 0;SSD1306.Initialized = 1;
}// Fill the whole screen with the given color
void ssd1306_Fill(SSD1306_COLOR color) {/* Set memory */uint32_t i;for(i = 0; i < sizeof(SSD1306_Buffer); i++) {SSD1306_Buffer[i] = (color == Black) ? 0x00 : 0xFF;}
}// Write the screenbuffer with changed to the screen
void ssd1306_UpdateScreen(void) {// Write data to each page of RAM. Number of pages// depends on the screen height:////  * 32px   ==  4 pages//  * 64px   ==  8 pages//  * 128px  ==  16 pagesuint8_t cmd[] = {0X21,   // 设置列起始和结束地址0X00,   // 列起始地址 00X7F,   // 列终止地址 1270X22,   // 设置页起始和结束地址0X00,   // 页起始地址 00X07,   // 页终止地址 7};uint32_t count = 0;uint8_t data[sizeof(cmd)*2 + SSD1306_BUFFER_SIZE + 1] = {};// copy cmdfor (uint32_t i = 0; i < sizeof(cmd)/sizeof(cmd[0]); i++) {data[count++] = SSD1306_CTRL_CMD | SSD1306_MASK_CONT;data[count++] = cmd[i];}// copy frame datadata[count++] = SSD1306_CTRL_DATA;memcpy(&data[count], SSD1306_Buffer, sizeof(SSD1306_Buffer));count += sizeof(SSD1306_Buffer);// send to i2c busuint32_t retval = ssd1306_SendData(data, count);if (retval != 0) {printf("ssd1306_UpdateScreen send frame data filed: %d!\r\n", retval);}
}//    Draw one pixel in the screenbuffer
//    X => X Coordinate
//    Y => Y Coordinate
//    color => Pixel color
void ssd1306_DrawPixel(uint8_t x, uint8_t y, SSD1306_COLOR color) {if(x >= SSD1306_WIDTH || y >= SSD1306_HEIGHT) {// Don't write outside the bufferreturn;}// Check if pixel should be invertedif(SSD1306.Inverted) {color = (SSD1306_COLOR)!color;}// Draw in the right colorif(color == White) {SSD1306_Buffer[x + (y / 8) * SSD1306_WIDTH] |= 1 << (y % 8);} else {SSD1306_Buffer[x + (y / 8) * SSD1306_WIDTH] &= ~(1 << (y % 8));}
}// Draw 1 char to the screen buffer
// ch       => char om weg te schrijven
// Font     => Font waarmee we gaan schrijven
// color    => Black or White
char ssd1306_DrawChar(char ch, FontDef Font, SSD1306_COLOR color) {uint32_t i, b, j;// Check if character is validif (ch < 32 || ch > 126)return 0;// Check remaining space on current lineif (SSD1306_WIDTH < (SSD1306.CurrentX + Font.FontWidth) ||SSD1306_HEIGHT < (SSD1306.CurrentY + Font.FontHeight)){// Not enough space on current linereturn 0;}// Use the font to writefor(i = 0; i < Font.FontHeight; i++) {b = Font.data[(ch - 32) * Font.FontHeight + i];for(j = 0; j < Font.FontWidth; j++) {if((b << j) & 0x8000)  {ssd1306_DrawPixel(SSD1306.CurrentX + j, (SSD1306.CurrentY + i), (SSD1306_COLOR) color);} else {ssd1306_DrawPixel(SSD1306.CurrentX + j, (SSD1306.CurrentY + i), (SSD1306_COLOR)!color);}}}// The current space is now takenSSD1306.CurrentX += Font.FontWidth;// Return written char for validationreturn ch;
}// Write full string to screenbuffer
char ssd1306_DrawString(char* str, FontDef Font, SSD1306_COLOR color) {// Write until null-bytewhile (*str) {if (ssd1306_DrawChar(*str, Font, color) != *str) {// Char could not be writtenreturn *str;}// Next charstr++;}// Everything okreturn *str;
}// Position the cursor
void ssd1306_SetCursor(uint8_t x, uint8_t y) {SSD1306.CurrentX = x;SSD1306.CurrentY = y;
}// Draw line by Bresenhem's algorithm
void ssd1306_DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, SSD1306_COLOR color) {int32_t deltaX = abs(x2 - x1);int32_t deltaY = abs(y2 - y1);int32_t signX = ((x1 < x2) ? 1 : -1);int32_t signY = ((y1 < y2) ? 1 : -1);int32_t error = deltaX - deltaY;int32_t error2;ssd1306_DrawPixel(x2, y2, color);while((x1 != x2) || (y1 != y2)){ssd1306_DrawPixel(x1, y1, color);error2 = error * 2;if(error2 > -deltaY){error -= deltaY;x1 += signX;}else{/*nothing to do*/}if(error2 < deltaX){error += deltaX;y1 += signY;}else{/*nothing to do*/}}return;
}
//Draw polyline
void ssd1306_DrawPolyline(const SSD1306_VERTEX *par_vertex, uint16_t par_size, SSD1306_COLOR color) {uint16_t i;if(par_vertex != 0){for(i = 1; i < par_size; i++){ssd1306_DrawLine(par_vertex[i - 1].x, par_vertex[i - 1].y, par_vertex[i].x, par_vertex[i].y, color);}}else{/*nothing to do*/}return;
}
/*Convert Degrees to Radians*/
static float ssd1306_DegToRad(float par_deg) {return par_deg * 3.14 / 180.0;
}
/*Normalize degree to [0;360]*/
static uint16_t ssd1306_NormalizeTo0_360(uint16_t par_deg) {uint16_t loc_angle;if(par_deg <= 360){loc_angle = par_deg;}else{loc_angle = par_deg % 360;loc_angle = ((par_deg != 0)?par_deg:360);}return loc_angle;
}
/*DrawArc. Draw angle is beginning from 4 quart of trigonometric circle (3pi/2)* start_angle in degree* sweep in degree*/
void ssd1306_DrawArc(uint8_t x, uint8_t y, uint8_t radius, uint16_t start_angle, uint16_t sweep, SSD1306_COLOR color) {#define CIRCLE_APPROXIMATION_SEGMENTS 36float approx_degree;uint32_t approx_segments;uint8_t xp1,xp2;uint8_t yp1,yp2;uint32_t count = 0;uint32_t loc_sweep = 0;float rad;loc_sweep = ssd1306_NormalizeTo0_360(sweep);count = (ssd1306_NormalizeTo0_360(start_angle) * CIRCLE_APPROXIMATION_SEGMENTS) / 360;approx_segments = (loc_sweep * CIRCLE_APPROXIMATION_SEGMENTS) / 360;approx_degree = loc_sweep / (float)approx_segments;while(count < approx_segments){rad = ssd1306_DegToRad(count*approx_degree);xp1 = x + (int8_t)(sin(rad)*radius);yp1 = y + (int8_t)(cos(rad)*radius);count++;if(count != approx_segments){rad = ssd1306_DegToRad(count*approx_degree);}else{rad = ssd1306_DegToRad(loc_sweep);}xp2 = x + (int8_t)(sin(rad)*radius);yp2 = y + (int8_t)(cos(rad)*radius);ssd1306_DrawLine(xp1,yp1,xp2,yp2,color);}return;
}
//Draw circle by Bresenhem's algorithm
void ssd1306_DrawCircle(uint8_t par_x,uint8_t par_y,uint8_t par_r,SSD1306_COLOR par_color) {int32_t x = -par_r;int32_t y = 0;int32_t err = 2 - 2 * par_r;int32_t e2;if (par_x >= SSD1306_WIDTH || par_y >= SSD1306_HEIGHT) {return;}do {ssd1306_DrawPixel(par_x - x, par_y + y, par_color);ssd1306_DrawPixel(par_x + x, par_y + y, par_color);ssd1306_DrawPixel(par_x + x, par_y - y, par_color);ssd1306_DrawPixel(par_x - x, par_y - y, par_color);e2 = err;if (e2 <= y) {y++;err = err + (y * 2 + 1);if(-x == y && e2 <= x) {e2 = 0;}else{/*nothing to do*/}}else{/*nothing to do*/}if(e2 > x) {x++;err = err + (x * 2 + 1);}else{/*nothing to do*/}} while(x <= 0);return;
}//Draw rectangle
void ssd1306_DrawRectangle(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, SSD1306_COLOR color) {ssd1306_DrawLine(x1,y1,x2,y1,color);ssd1306_DrawLine(x2,y1,x2,y2,color);ssd1306_DrawLine(x2,y2,x1,y2,color);ssd1306_DrawLine(x1,y2,x1,y1,color);return;
}void ssd1306_DrawBitmap(const uint8_t* bitmap, uint32_t size)
{uint8_t rows = size * 8 / SSD1306_WIDTH;if (rows > SSD1306_HEIGHT) {rows = SSD1306_HEIGHT;}for (uint8_t y = 0; y < rows; y++) {for (uint8_t x = 0; x < SSD1306_WIDTH; x++) {uint8_t byte = bitmap[(y * SSD1306_WIDTH / 8) + (x / 8)];uint8_t bit = byte & (0x80 >> (x % 8));ssd1306_DrawPixel(x, y, bit ? White : Black);}}
}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)
{if (x + w > SSD1306_WIDTH || y + h > SSD1306_HEIGHT || w * h == 0) {printf("%dx%d @ %d,%d out of range or invalid!\r\n", w, h, x, y);return;}w = (w <= SSD1306_WIDTH ? w : SSD1306_WIDTH);h = (h <= SSD1306_HEIGHT ? h : SSD1306_HEIGHT);stride = (stride == 0 ? w : stride);uint8_t rows = size * 8 / stride;for (uint8_t i = 0; i < rows; i++) {uint32_t base = i * stride / 8;for (uint8_t j = 0; j < w; j++) {uint32_t idx = base + (j / 8);uint8_t byte = idx < size ? data[idx] : 0;uint8_t bit  = byte & (0x80 >> (j % 8));ssd1306_DrawPixel(x + j, y + i, bit ? White : Black);}}
}void ssd1306_SetContrast(const uint8_t value) {const uint8_t kSetContrastControlRegister = 0x81;ssd1306_WriteCommand(kSetContrastControlRegister);ssd1306_WriteCommand(value);
}void ssd1306_SetDisplayOn(const uint8_t on) {uint8_t value;if (on) {value = 0xAF;   // Display onSSD1306.DisplayOn = 1;} else {value = 0xAE;   // Display offSSD1306.DisplayOn = 0;}ssd1306_WriteCommand(value);
}uint8_t ssd1306_GetDisplayOn() {return SSD1306.DisplayOn;
}
ssd1306.h
#include "ssd1306.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>  // For memcpy#include <stdio.h>
#include <unistd.h>
#include "cmsis_os2.h"
#include <stdio.h>
#include "cmsis_os2.h"
#include "ohos_run.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "esp_log.h"
#include "driver/gpio.h"
#include "driver/i2c.h"#if defined(SSD1306_USE_I2C)#define SSD1306_I2C_IDX     0#define SSD1306_CTRL_CMD 0x00
#define SSD1306_CTRL_DATA 0x40
#define SSD1306_MASK_CONT (0x1<<7)void ssd1306_Reset(void) {/* for I2C - do nothing */
}void HAL_Delay(uint32_t ms)
{usleep(ms * 1000);
}static uint32_t ssd1306_SendData(uint8_t* data, size_t size)
{int i;i2c_cmd_handle_t cmd_handle = i2c_cmd_link_create();i2c_master_start(cmd_handle);i2c_master_write_byte(cmd_handle, SSD1306_I2C_ADDR, true);for(i = 0; i < size; i ++){i2c_master_write_byte(cmd_handle, data[i], true);}i2c_master_stop(cmd_handle);esp_err_t error = i2c_master_cmd_begin(I2C_NUM_0,cmd_handle,100/portTICK_PERIOD_MS);i2c_cmd_link_delete(cmd_handle);return error;
}static uint32_t ssd1306_WiteByte(uint8_t regAddr, uint8_t byte)
{uint8_t buffer[] = {regAddr, byte};return ssd1306_SendData(buffer, sizeof(buffer));
}// Send a byte to the command register
void ssd1306_WriteCommand(uint8_t byte) {ssd1306_WiteByte(SSD1306_CTRL_CMD, byte);
}// Send data
void ssd1306_WriteData(uint8_t* buffer, size_t buff_size) {uint8_t data[SSD1306_WIDTH * 2] = {0};for (size_t i = 0; i < buff_size; i++) {data[i*2] = SSD1306_CTRL_DATA | SSD1306_MASK_CONT;data[i*2+1] = buffer[i];}data[(buff_size - 1) * 2] = SSD1306_CTRL_DATA;ssd1306_SendData(data, sizeof(data));
}#elif defined(SSD1306_USE_SPI)void ssd1306_Reset(void) {// CS = High (not selected)HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET);// Reset the OLEDHAL_GPIO_WritePin(SSD1306_Reset_Port, SSD1306_Reset_Pin, GPIO_PIN_RESET);HAL_Delay(10);HAL_GPIO_WritePin(SSD1306_Reset_Port, SSD1306_Reset_Pin, GPIO_PIN_SET);HAL_Delay(10);
}// Send a byte to the command register
void ssd1306_WriteCommand(uint8_t byte) {HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_RESET); // select OLEDHAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_RESET); // commandHAL_SPI_Transmit(&SSD1306_SPI_PORT, (uint8_t *) &byte, 1, HAL_MAX_DELAY);HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET); // un-select OLED
}// Send data
void ssd1306_WriteData(uint8_t* buffer, size_t buff_size) {HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_RESET); // select OLEDHAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_SET); // dataHAL_SPI_Transmit(&SSD1306_SPI_PORT, buffer, buff_size, HAL_MAX_DELAY);HAL_GPIO_WritePin(SSD1306_CS_Port, SSD1306_CS_Pin, GPIO_PIN_SET); // un-select OLED
}#else
#error "You should define SSD1306_USE_SPI or SSD1306_USE_I2C macro"
#endif// Screenbuffer
static uint8_t SSD1306_Buffer[SSD1306_BUFFER_SIZE];// Screen object
static SSD1306_t SSD1306;/* Fills the Screenbuffer with values from a given buffer of a fixed length */
SSD1306_Error_t ssd1306_FillBuffer(uint8_t* buf, uint32_t len) {SSD1306_Error_t ret = SSD1306_ERR;if (len <= SSD1306_BUFFER_SIZE) {memcpy(SSD1306_Buffer,buf,len);ret = SSD1306_OK;}return ret;
}// Initialize the oled screen
void ssd1306_Init(void) {// Reset OLEDssd1306_Reset();// Wait for the screen to bootHAL_Delay(100);// Init OLEDssd1306_SetDisplayOn(0); //display offssd1306_WriteCommand(0x20); //Set Memory Addressing Modessd1306_WriteCommand(0x00); // 00b,Horizontal Addressing Mode; 01b,Vertical Addressing Mode;// 10b,Page Addressing Mode (RESET); 11b,Invalidssd1306_WriteCommand(0xB0); //Set Page Start Address for Page Addressing Mode,0-7#ifdef SSD1306_MIRROR_VERTssd1306_WriteCommand(0xC0); // Mirror vertically
#elsessd1306_WriteCommand(0xC8); //Set COM Output Scan Direction
#endifssd1306_WriteCommand(0x00); //---set low column addressssd1306_WriteCommand(0x10); //---set high column addressssd1306_WriteCommand(0x40); //--set start line address - CHECKssd1306_SetContrast(0xFF);#ifdef SSD1306_MIRROR_HORIZssd1306_WriteCommand(0xA0); // Mirror horizontally
#elsessd1306_WriteCommand(0xA1); //--set segment re-map 0 to 127 - CHECK
#endif#ifdef SSD1306_INVERSE_COLORssd1306_WriteCommand(0xA7); //--set inverse color
#elsessd1306_WriteCommand(0xA6); //--set normal color
#endif// Set multiplex ratio.
#if (SSD1306_HEIGHT == 128)// Found in the Luma Python lib for SH1106.ssd1306_WriteCommand(0xFF);
#elsessd1306_WriteCommand(0xA8); //--set multiplex ratio(1 to 64) - CHECK
#endif#if (SSD1306_HEIGHT == 32)ssd1306_WriteCommand(0x1F); //
#elif (SSD1306_HEIGHT == 64)ssd1306_WriteCommand(0x3F); //
#elif (SSD1306_HEIGHT == 128)ssd1306_WriteCommand(0x3F); // Seems to work for 128px high displays too.
#else
#error "Only 32, 64, or 128 lines of height are supported!"
#endifssd1306_WriteCommand(0xA4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM contentssd1306_WriteCommand(0xD3); //-set display offset - CHECKssd1306_WriteCommand(0x00); //-not offsetssd1306_WriteCommand(0xD5); //--set display clock divide ratio/oscillator frequencyssd1306_WriteCommand(0xF0); //--set divide ratiossd1306_WriteCommand(0xD9); //--set pre-charge periodssd1306_WriteCommand(0x11); // 0x22 by defaultssd1306_WriteCommand(0xDA); //--set com pins hardware configuration - CHECK
#if (SSD1306_HEIGHT == 32)ssd1306_WriteCommand(0x02);
#elif (SSD1306_HEIGHT == 64)ssd1306_WriteCommand(0x12);
#elif (SSD1306_HEIGHT == 128)ssd1306_WriteCommand(0x12);
#else
#error "Only 32, 64, or 128 lines of height are supported!"
#endifssd1306_WriteCommand(0xDB); //--set vcomhssd1306_WriteCommand(0x30); //0x20,0.77xVcc, 0x30,0.83xVccssd1306_WriteCommand(0x8D); //--set DC-DC enablessd1306_WriteCommand(0x14); //ssd1306_SetDisplayOn(1); //--turn on SSD1306 panel// Clear screenssd1306_Fill(Black);// Flush buffer to screenssd1306_UpdateScreen();// Set default values for screen objectSSD1306.CurrentX = 0;SSD1306.CurrentY = 0;SSD1306.Initialized = 1;
}// Fill the whole screen with the given color
void ssd1306_Fill(SSD1306_COLOR color) {/* Set memory */uint32_t i;for(i = 0; i < sizeof(SSD1306_Buffer); i++) {SSD1306_Buffer[i] = (color == Black) ? 0x00 : 0xFF;}
}// Write the screenbuffer with changed to the screen
void ssd1306_UpdateScreen(void) {// Write data to each page of RAM. Number of pages// depends on the screen height:////  * 32px   ==  4 pages//  * 64px   ==  8 pages//  * 128px  ==  16 pagesuint8_t cmd[] = {0X21,   // 设置列起始和结束地址0X00,   // 列起始地址 00X7F,   // 列终止地址 1270X22,   // 设置页起始和结束地址0X00,   // 页起始地址 00X07,   // 页终止地址 7};uint32_t count = 0;uint8_t data[sizeof(cmd)*2 + SSD1306_BUFFER_SIZE + 1] = {};// copy cmdfor (uint32_t i = 0; i < sizeof(cmd)/sizeof(cmd[0]); i++) {data[count++] = SSD1306_CTRL_CMD | SSD1306_MASK_CONT;data[count++] = cmd[i];}// copy frame datadata[count++] = SSD1306_CTRL_DATA;memcpy(&data[count], SSD1306_Buffer, sizeof(SSD1306_Buffer));count += sizeof(SSD1306_Buffer);// send to i2c busuint32_t retval = ssd1306_SendData(data, count);if (retval != 0) {printf("ssd1306_UpdateScreen send frame data filed: %d!\r\n", retval);}
}//    Draw one pixel in the screenbuffer
//    X => X Coordinate
//    Y => Y Coordinate
//    color => Pixel color
void ssd1306_DrawPixel(uint8_t x, uint8_t y, SSD1306_COLOR color) {if(x >= SSD1306_WIDTH || y >= SSD1306_HEIGHT) {// Don't write outside the bufferreturn;}// Check if pixel should be invertedif(SSD1306.Inverted) {color = (SSD1306_COLOR)!color;}// Draw in the right colorif(color == White) {SSD1306_Buffer[x + (y / 8) * SSD1306_WIDTH] |= 1 << (y % 8);} else {SSD1306_Buffer[x + (y / 8) * SSD1306_WIDTH] &= ~(1 << (y % 8));}
}// Draw 1 char to the screen buffer
// ch       => char om weg te schrijven
// Font     => Font waarmee we gaan schrijven
// color    => Black or White
char ssd1306_DrawChar(char ch, FontDef Font, SSD1306_COLOR color) {uint32_t i, b, j;// Check if character is validif (ch < 32 || ch > 126)return 0;// Check remaining space on current lineif (SSD1306_WIDTH < (SSD1306.CurrentX + Font.FontWidth) ||SSD1306_HEIGHT < (SSD1306.CurrentY + Font.FontHeight)){// Not enough space on current linereturn 0;}// Use the font to writefor(i = 0; i < Font.FontHeight; i++) {b = Font.data[(ch - 32) * Font.FontHeight + i];for(j = 0; j < Font.FontWidth; j++) {if((b << j) & 0x8000)  {ssd1306_DrawPixel(SSD1306.CurrentX + j, (SSD1306.CurrentY + i), (SSD1306_COLOR) color);} else {ssd1306_DrawPixel(SSD1306.CurrentX + j, (SSD1306.CurrentY + i), (SSD1306_COLOR)!color);}}}// The current space is now takenSSD1306.CurrentX += Font.FontWidth;// Return written char for validationreturn ch;
}// Write full string to screenbuffer
char ssd1306_DrawString(char* str, FontDef Font, SSD1306_COLOR color) {// Write until null-bytewhile (*str) {if (ssd1306_DrawChar(*str, Font, color) != *str) {// Char could not be writtenreturn *str;}// Next charstr++;}// Everything okreturn *str;
}// Position the cursor
void ssd1306_SetCursor(uint8_t x, uint8_t y) {SSD1306.CurrentX = x;SSD1306.CurrentY = y;
}// Draw line by Bresenhem's algorithm
void ssd1306_DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, SSD1306_COLOR color) {int32_t deltaX = abs(x2 - x1);int32_t deltaY = abs(y2 - y1);int32_t signX = ((x1 < x2) ? 1 : -1);int32_t signY = ((y1 < y2) ? 1 : -1);int32_t error = deltaX - deltaY;int32_t error2;ssd1306_DrawPixel(x2, y2, color);while((x1 != x2) || (y1 != y2)){ssd1306_DrawPixel(x1, y1, color);error2 = error * 2;if(error2 > -deltaY){error -= deltaY;x1 += signX;}else{/*nothing to do*/}if(error2 < deltaX){error += deltaX;y1 += signY;}else{/*nothing to do*/}}return;
}
//Draw polyline
void ssd1306_DrawPolyline(const SSD1306_VERTEX *par_vertex, uint16_t par_size, SSD1306_COLOR color) {uint16_t i;if(par_vertex != 0){for(i = 1; i < par_size; i++){ssd1306_DrawLine(par_vertex[i - 1].x, par_vertex[i - 1].y, par_vertex[i].x, par_vertex[i].y, color);}}else{/*nothing to do*/}return;
}
/*Convert Degrees to Radians*/
static float ssd1306_DegToRad(float par_deg) {return par_deg * 3.14 / 180.0;
}
/*Normalize degree to [0;360]*/
static uint16_t ssd1306_NormalizeTo0_360(uint16_t par_deg) {uint16_t loc_angle;if(par_deg <= 360){loc_angle = par_deg;}else{loc_angle = par_deg % 360;loc_angle = ((par_deg != 0)?par_deg:360);}return loc_angle;
}
/*DrawArc. Draw angle is beginning from 4 quart of trigonometric circle (3pi/2)* start_angle in degree* sweep in degree*/
void ssd1306_DrawArc(uint8_t x, uint8_t y, uint8_t radius, uint16_t start_angle, uint16_t sweep, SSD1306_COLOR color) {#define CIRCLE_APPROXIMATION_SEGMENTS 36float approx_degree;uint32_t approx_segments;uint8_t xp1,xp2;uint8_t yp1,yp2;uint32_t count = 0;uint32_t loc_sweep = 0;float rad;loc_sweep = ssd1306_NormalizeTo0_360(sweep);count = (ssd1306_NormalizeTo0_360(start_angle) * CIRCLE_APPROXIMATION_SEGMENTS) / 360;approx_segments = (loc_sweep * CIRCLE_APPROXIMATION_SEGMENTS) / 360;approx_degree = loc_sweep / (float)approx_segments;while(count < approx_segments){rad = ssd1306_DegToRad(count*approx_degree);xp1 = x + (int8_t)(sin(rad)*radius);yp1 = y + (int8_t)(cos(rad)*radius);count++;if(count != approx_segments){rad = ssd1306_DegToRad(count*approx_degree);}else{rad = ssd1306_DegToRad(loc_sweep);}xp2 = x + (int8_t)(sin(rad)*radius);yp2 = y + (int8_t)(cos(rad)*radius);ssd1306_DrawLine(xp1,yp1,xp2,yp2,color);}return;
}
//Draw circle by Bresenhem's algorithm
void ssd1306_DrawCircle(uint8_t par_x,uint8_t par_y,uint8_t par_r,SSD1306_COLOR par_color) {int32_t x = -par_r;int32_t y = 0;int32_t err = 2 - 2 * par_r;int32_t e2;if (par_x >= SSD1306_WIDTH || par_y >= SSD1306_HEIGHT) {return;}do {ssd1306_DrawPixel(par_x - x, par_y + y, par_color);ssd1306_DrawPixel(par_x + x, par_y + y, par_color);ssd1306_DrawPixel(par_x + x, par_y - y, par_color);ssd1306_DrawPixel(par_x - x, par_y - y, par_color);e2 = err;if (e2 <= y) {y++;err = err + (y * 2 + 1);if(-x == y && e2 <= x) {e2 = 0;}else{/*nothing to do*/}}else{/*nothing to do*/}if(e2 > x) {x++;err = err + (x * 2 + 1);}else{/*nothing to do*/}} while(x <= 0);return;
}//Draw rectangle
void ssd1306_DrawRectangle(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, SSD1306_COLOR color) {ssd1306_DrawLine(x1,y1,x2,y1,color);ssd1306_DrawLine(x2,y1,x2,y2,color);ssd1306_DrawLine(x2,y2,x1,y2,color);ssd1306_DrawLine(x1,y2,x1,y1,color);return;
}void ssd1306_DrawBitmap(const uint8_t* bitmap, uint32_t size)
{uint8_t rows = size * 8 / SSD1306_WIDTH;if (rows > SSD1306_HEIGHT) {rows = SSD1306_HEIGHT;}for (uint8_t y = 0; y < rows; y++) {for (uint8_t x = 0; x < SSD1306_WIDTH; x++) {uint8_t byte = bitmap[(y * SSD1306_WIDTH / 8) + (x / 8)];uint8_t bit = byte & (0x80 >> (x % 8));ssd1306_DrawPixel(x, y, bit ? White : Black);}}
}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)
{if (x + w > SSD1306_WIDTH || y + h > SSD1306_HEIGHT || w * h == 0) {printf("%dx%d @ %d,%d out of range or invalid!\r\n", w, h, x, y);return;}w = (w <= SSD1306_WIDTH ? w : SSD1306_WIDTH);h = (h <= SSD1306_HEIGHT ? h : SSD1306_HEIGHT);stride = (stride == 0 ? w : stride);uint8_t rows = size * 8 / stride;for (uint8_t i = 0; i < rows; i++) {uint32_t base = i * stride / 8;for (uint8_t j = 0; j < w; j++) {uint32_t idx = base + (j / 8);uint8_t byte = idx < size ? data[idx] : 0;uint8_t bit  = byte & (0x80 >> (j % 8));ssd1306_DrawPixel(x + j, y + i, bit ? White : Black);}}
}void ssd1306_SetContrast(const uint8_t value) {const uint8_t kSetContrastControlRegister = 0x81;ssd1306_WriteCommand(kSetContrastControlRegister);ssd1306_WriteCommand(value);
}void ssd1306_SetDisplayOn(const uint8_t on) {uint8_t value;if (on) {value = 0xAF;   // Display onSSD1306.DisplayOn = 1;} else {value = 0xAE;   // Display offSSD1306.DisplayOn = 0;}ssd1306_WriteCommand(value);
}uint8_t ssd1306_GetDisplayOn() {return SSD1306.DisplayOn;
}

ssd1306_demo.c
/** Copyright (c) 2020, HiHope Community.** Redistribution and use in source and binary forms, with or without* modification, are permitted provided that the following conditions are met:** 1. Redistributions of source code must retain the above copyright notice, this*    list of conditions and the following disclaimer.** 2. Redistributions in binary form must reproduce the above copyright notice,*    this list of conditions and the following disclaimer in the documentation*    and/or other materials provided with the distribution.** 3. Neither the name of the copyright holder nor the names of its*    contributors may be used to endorse or promote products derived from*    this software without specific prior written permission.** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.*/#include <stdio.h>
#include <unistd.h>#include "ohos_init.h"
#include "cmsis_os2.h"
#include <stdio.h>
#include "cmsis_os2.h"
#include "ohos_run.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "esp_log.h"
#include "driver/gpio.h"
#include "driver/i2c.h"#include "ssd1306.h"
#include "ssd1306_tests.h"#define OLED_I2C_BAUDRATE 400*1000void TestGetTick(void)
{}/*** 汉字字模在线： https://www.23bei.com/tool-223.html* 数据排列：从左到右从上到下* 取模方式：横向8位左高位
**/
void TestDrawChinese1(void)
{const uint32_t W = 16, H = 16;uint8_t fonts[][32] = {/* [字库]：[HZK1616宋体] [数据排列]:从左到右从上到下 [取模方式]:横向8点左高位 [正负反色]:否 [去掉重复后]共6个字符[总字符库]："　鸿蒙实验箱"*/{/*-- ID:0,字符:"　",ASCII编码:A1A1,对应字:宽x高=16x16,画布:宽W=16 高H=16,共32字节*/0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{/*-- ID:1,字符:"鸿",ASCII编码:BAE8,对应字:宽x高=16x16,画布:宽W=16 高H=16,共32字节*/0x40,0x20,0x30,0x48,0x10,0xFC,0x02,0x88,0x9F,0xA8,0x64,0x88,0x24,0xA8,0x04,0x90,0x14,0x84,0x14,0xFE,0xE7,0x04,0x3C,0x24,0x29,0xF4,0x20,0x04,0x20,0x14,0x20,0x08,},{/*-- ID:2,字符:"蒙",ASCII编码:C3C9,对应字:宽x高=16x16,画布:宽W=16 高H=16,共32字节*/0x04,0x48,0x7F,0xFC,0x04,0x40,0x7F,0xFE,0x40,0x02,0x8F,0xE4,0x00,0x00,0x7F,0xFC,0x06,0x10,0x3B,0x30,0x05,0xC0,0x1A,0xA0,0x64,0x90,0x18,0x8E,0x62,0x84,0x01,0x00,},{/*-- ID:3,字符:"实",ASCII编码:CAB5,对应字:宽x高=16x16,画布:宽W=16 高H=16,共32字节*/0x02,0x00,0x01,0x00,0x7F,0xFE,0x48,0x02,0x86,0x84,0x02,0x80,0x10,0x80,0x0C,0x80,0x04,0x84,0xFF,0xFE,0x01,0x00,0x01,0x40,0x02,0x20,0x04,0x10,0x18,0x0C,0x60,0x04,},{/*-- ID:4,字符:"验",ASCII编码:D1E9,对应字:宽x高=16x16,画布:宽W=16 高H=16,共32字节*/0x08,0x40,0xFC,0x40,0x08,0xA0,0x48,0xA0,0x49,0x10,0x4A,0x0E,0x4D,0xF4,0x48,0x00,0x7C,0x48,0x06,0x48,0x05,0x48,0x1D,0x50,0xE5,0x10,0x44,0x24,0x17,0xFE,0x08,0x00,},{/*-- ID:5,字符:"箱",ASCII编码:CFE4,对应字:宽x高=16x16,画布:宽W=16 高H=16,共32字节*/0x12,0x44,0x1F,0x7E,0x28,0xA0,0x45,0x10,0x08,0x04,0x08,0xFE,0xFE,0x84,0x08,0x84,0x18,0xFC,0x1C,0x84,0x2A,0x84,0x28,0xFC,0x48,0x84,0x88,0x84,0x08,0xFC,0x08,0x84}};ssd1306_Fill(Black);for (size_t i = 0; i < sizeof(fonts)/sizeof(fonts[0]); i++) {ssd1306_DrawRegion(i * W, 18, W, H, fonts[i], sizeof(fonts[0]), W);}ssd1306_UpdateScreen();sleep(1);
}void TestDrawChinese2(void)
{const uint32_t W = 12, H = 12, S = 16;/* [字库]：[HZK1212宋体] [数据排列]:从左到右从上到下 [取模方式]:横向8点左高位 [正负反色]:否 [去掉重复后]共9个字符[总字符库]："　－ＯＬＥＤ屏案例"*/uint8_t fonts[][24] = {{/*-- ID:0,字符:"　",ASCII编码:A1A1,对应字:宽x高=12x12,画布:宽W=16 高H=12,共24字节*/0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{/*-- ID:1,字符:"－",ASCII编码:A3AD,对应字:宽x高=12x12,画布:宽W=16 高H=12,共24字节*/0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x7F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,},{/*-- ID:2,字符:"Ｏ",ASCII编码:A3CF,对应字:宽x高=12x12,画布:宽W=16 高H=12,共24字节*/0x00,0x00,0x1C,0x00,0x36,0x00,0x63,0x00,0x63,0x00,0x63,0x00,0x63,0x00,0x63,0x00,0x36,0x00,0x1C,0x00,0x00,0x00,0x00,0x00,},{/*-- ID:3,字符:"Ｌ",ASCII编码:A3CC,对应字:宽x高=12x12,画布:宽W=16 高H=12,共24字节*/0x00,0x00,0x78,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x30,0x00,0x31,0x00,0x33,0x00,0x7F,0x00,0x00,0x00,0x00,0x00,},{/*-- ID:4,字符:"Ｅ",ASCII编码:A3C5,对应字:宽x高=12x12,画布:宽W=16 高H=12,共24字节*/0x00,0x00,0x7F,0x00,0x33,0x00,0x31,0x00,0x34,0x00,0x3C,0x00,0x34,0x00,0x31,0x00,0x33,0x00,0x7F,0x00,0x00,0x00,0x00,0x00,},{/*-- ID:5,字符:"Ｄ",ASCII编码:A3C4,对应字:宽x高=12x12,画布:宽W=16 高H=12,共24字节*/0x00,0x00,0x7C,0x00,0x36,0x00,0x33,0x00,0x33,0x00,0x33,0x00,0x33,0x00,0x33,0x00,0x36,0x00,0x7C,0x00,0x00,0x00,0x00,0x00,},{/*-- ID:6,字符:"屏",ASCII编码:C6C1,对应字:宽x高=12x12,画布:宽W=16 高H=12,共24字节*/0x7F,0xE0,0x40,0x20,0x7F,0xE0,0x48,0x80,0x45,0x00,0x5F,0xE0,0x44,0x80,0x7F,0xF0,0x44,0x80,0x44,0x80,0x48,0x80,0x90,0x80,},{/*-- ID:7,字符:"案",ASCII编码:B0B8,对应字:宽x高=12x12,画布:宽W=16 高H=12,共24字节*/0x04,0x00,0x7F,0xF0,0xC8,0x20,0x7F,0xF0,0x11,0x00,0x0E,0x00,0x71,0xC0,0x04,0x00,0xFF,0xF0,0x15,0x00,0x24,0xC0,0xC4,0x30,},{/*-- ID:8,字符:"例",ASCII编码:C0FD,对应字:宽x高=12x12,画布:宽W=16 高H=12,共24字节*/0x10,0x10,0x1F,0x90,0x24,0x50,0x27,0x50,0x69,0x50,0xA9,0x50,0x35,0x50,0x22,0x50,0x22,0x10,0x24,0x10,0x28,0x50,0x30,0x20}};ssd1306_Fill(Black);for (size_t i = 0; i < sizeof(fonts)/sizeof(fonts[0]); i++) {ssd1306_DrawRegion(i * H, 18, W, H, fonts[i], sizeof(fonts[0]), S);         //y= 18 居中显示}ssd1306_UpdateScreen();sleep(1);
}void Ssd1306TestTask(void* arg)
{(void) arg;i2c_config_t i2c_initer = {.clk_flags = 0,                         // 选择默认时钟源.master.clk_speed = 50000,             // 指定速率为100Kbit,最大可以为400Kbit.mode = I2C_MODE_MASTER,                // 主机模式.scl_io_num = 17,                        // 指定SCL的GPIO口.scl_pullup_en = true,                  // SCL接上拉电阻.sda_io_num = 16,                        // 指定SDA的GPIO口.sda_pullup_en = true,                  // SDA接上拉电阻};if(i2c_param_config(I2C_NUM_0, &i2c_initer) == ESP_OK){printf("i2c parm config success\r\n");}else{printf("config fail\r\n");}if(i2c_driver_install(I2C_NUM_0,I2C_MODE_MASTER,0,0,0) == ESP_OK ){printf("i2c driver install success\r\n");}else{printf("driver fail\r\n");}//WatchDogDisable();usleep(20*1000);ssd1306_Init();ssd1306_Fill(Black);ssd1306_SetCursor(0, 0);while (1) {TestDrawChinese1();ssd1306_UpdateScreen();usleep(10000);TestDrawChinese2();ssd1306_UpdateScreen();usleep(10000);}
}void Ssd1306TestDemo(void)
{osThreadAttr_t attr;attr.name = "Ssd1306Task";attr.attr_bits = 0U;attr.cb_mem = NULL;attr.cb_size = 0U;attr.stack_mem = NULL;attr.stack_size = 10240;attr.priority = osPriorityNormal;if (osThreadNew(Ssd1306TestTask, NULL, &attr) == NULL) {printf("[Ssd1306TestDemo] Falied to create Ssd1306TestTask!\n");}
}
OHOS_APP_RUN(Ssd1306TestDemo);

代码分析：

OLED屏幕分为页寻址模式，水平地址模式，垂直地址模式。

这里用的是页寻址模式，页寻址模式如下图，把整个OLED屏幕分成了八页，说白了就是把OLED的屏幕把宽平均分成了八份。比如想要在第0列第三行的开头显示一个点那就是按位来配置，0000 0100（0x08）。

通过I2C时序与SSD1306显存进行通信，把取好的字模数组中的每一项取出并点亮对应的像素点即可

实验现象

按下ESP32开发板上的EN键,即可观察到实验现象:

OLED屏显示汉字

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