[文章]鸿蒙Hi3861小视频参赛：自家开发版上OLED屏幕显示各项内容
0
3
做做了OLED 屏幕显示图片，特殊符号，字母，条形，圆弧，动画播放等操作。
代码量比较大，这里只展示小部分代码。
#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 "wifiiot_i2c.h"
#include "wifiiot_errno.h"
#if defined(SSD1306_USE_I2C)
#define SSD1306_I2C_IDX WIFI_IOT_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)
{
uint32_t msPerTick = 1000 / osKernelGetTickFreq(); // 10ms
if (ms >= msPerTick) {
osDelay(ms / msPerTick);
}
uint32_t restMs = ms % msPerTick;
if (restMs > 0) {
usleep(restMs * 1000);
}
}
uint32_t HAL_GetTick(void)
{
uint32_t msPerTick = 1000 / osKernelGetTickFreq(); // 10ms
uint32_t tickMs = osKernelGetTickCount() * msPerTick;
uint32_t csPerMs = osKernelGetSysTimerFreq() / 1000; // 160K cycle/ms
uint32_t csPerTick = csPerMs * msPerTick; // 1600K cycles/tick
uint32_t restMs = osKernelGetSysTimerCount() % csPerTick / csPerMs;
return tickMs + restMs;
}
static uint32_t ssd1306_SendData(uint8_t* data, size_t size)
{
WifiIotI2cIdx id = SSD1306_I2C_IDX;
WifiIotI2cData i2cData = {0};
i2cData.sendBuf = data;
i2cData.sendLen = size;
return I2cWrite(id, SSD1306_I2C_ADDR, &i2cData);
}
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;
}
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 OLED
HAL_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 OLED
HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_RESET); // command
HAL_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 OLED
HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_SET); // data
HAL_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 OLED
ssd1306_Reset();
// Wait for the screen to boot
HAL_Delay(100);
// Init OLED
ssd1306_SetDisplayOn(0); //display off
ssd1306_WriteCommand(0x20); //Set Memory Addressing Mode
ssd1306_WriteCommand(0x00); // 00b,Horizontal Addressing Mode; 01b,Vertical Addressing Mode;
// 10b,Page Addressing Mode (RESET); 11b,Invalid
ssd1306_WriteCommand(0xB0); //Set Page Start Address for Page Addressing Mode,0-7
#ifdef SSD1306_MIRROR_VERT
ssd1306_WriteCommand(0xC0); // Mirror vertically
#else
ssd1306_WriteCommand(0xC8); //Set COM Output Scan Direction
#endif
ssd1306_WriteCommand(0x00); //---set low column address
ssd1306_WriteCommand(0x10); //---set high column address
ssd1306_WriteCommand(0x40); //--set start line address - CHECK
ssd1306_SetContrast(0xFF);
#ifdef SSD1306_MIRROR_HORIZ
ssd1306_WriteCommand(0xA0); // Mirror horizontally
#else
ssd1306_WriteCommand(0xA1); //--set segment re-map 0 to 127 - CHECK
#endif
#ifdef SSD1306_INVERSE_COLOR
ssd1306_WriteCommand(0xA7); //--set inverse color
#else
ssd1306_WriteCommand(0xA6); //--set normal color
#endif
// Set multiplex ratio.
#if (SSD1306_HEIGHT == 128)
// Found in the Luma Python lib for SH1106.
ssd1306_WriteCommand(0xFF);
#else
ssd1306_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!"
#endif
ssd1306_WriteCommand(0xA4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
ssd1306_WriteCommand(0xD3); //-set display offset - CHECK
ssd1306_WriteCommand(0x00); //-not offset
ssd1306_WriteCommand(0xD5); //--set display clock divide ratio/oscillator frequency
ssd1306_WriteCommand(0xF0); //--set divide ratio
ssd1306_WriteCommand(0xD9); //--set pre-charge period
ssd1306_WriteCommand(0x11); // 0x22 by default
ssd1306_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!"
#endif
ssd1306_WriteCommand(0xDB); //--set vcomh
ssd1306_WriteCommand(0x30); //0x20,0.77xVcc, 0x30,0.83xVcc
ssd1306_WriteCommand(0x8D); //--set DC-DC enable
ssd1306_WriteCommand(0x14); //
ssd1306_SetDisplayOn(1); //--turn on SSD1306 panel
// Clear screen
ssd1306_Fill(Black);
// Flush buffer to screen
ssd1306_UpdateScreen();
// Set default values for screen object
SSD1306.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 = (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 pages
uint8_t cmd[] = {
0X21, // 设置列起始和结束地址
0X00, // 列起始地址 0
0X7F, // 列终止地址 127
0X22, // 设置页起始和结束地址
0X00, // 页起始地址 0
0X07, // 页终止地址 7
};
uint32_t count = 0;
uint8_t data[sizeof(cmd)*2 + SSD1306_BUFFER_SIZE + 1] = {};
// copy cmd
for (uint32_t i = 0; i < sizeof(cmd)/sizeof(cmd[0]); i++) {
data[count++] = SSD1306_CTRL_CMD | SSD1306_MASK_CONT;
data[count++] = cmd;
}
// copy frame data
data[count++] = SSD1306_CTRL_DATA;
memcpy(&data[count], SSD1306_Buffer, sizeof(SSD1306_Buffer));
count += sizeof(SSD1306_Buffer);
// send to i2c bus
uint32_t retval = ssd1306_SendData(data, count);
if (retval != WIFI_IOT_SUCCESS) {
printf("ssd1306_UpdateScreen send frame data filed: %d!rn", 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 buffer
return;
}
// Check if pixel should be inverted
if(SSD1306.Inverted) {
color = (SSD1306_COLOR)!color;
}
// Draw in the right color
if(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 valid
if (ch < 32 || ch > 126)
return 0;
// Check remaining space on current line
if (SSD1306_WIDTH < (SSD1306.CurrentX + Font.FontWidth) ||
SSD1306_HEIGHT < (SSD1306.CurrentY + Font.FontHeight))
{
// Not enough space on current line
return 0;
}
// Use the font to write
for(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 taken
SSD1306.CurrentX += Font.FontWidth;
// Return written char for validation
return ch;
}
// Write full string to screenbuffer
char ssd1306_DrawString(char* str, FontDef Font, SSD1306_COLOR color) {
// Write until null-byte
while (*str) {
if (ssd1306_DrawChar(*str, Font, color) != *str) {
// Char could not be written
return *str;
}
// Next char
str++;
}
// Everything ok
return *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.x, par_vertex.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 36
float 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!rn", 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 on
SSD1306.DisplayOn = 1;
} else {
value = 0xAE; // Display off
SSD1306.DisplayOn = 0;
}
ssd1306_WriteCommand(value);
}
uint8_t ssd1306_GetDisplayOn() {
return SSD1306.DisplayOn;
}
本部分功能实现，参考与引用了许思维老师的部分公开代码。
做了OLED 屏幕显示图片，特殊符号，字母，条形，圆弧，动画播放等操作。
代码量比较大，这里只展示小部分代码。
#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 "wifiiot_i2c.h"
#include "wifiiot_errno.h"
#if defined(SSD1306_USE_I2C)
#define SSD1306_I2C_IDX WIFI_IOT_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)
{
uint32_t msPerTick = 1000 / osKernelGetTickFreq(); // 10ms
if (ms >= msPerTick) {
osDelay(ms / msPerTick);
}
uint32_t restMs = ms % msPerTick;
if (restMs > 0) {
usleep(restMs * 1000);
}
}
uint32_t HAL_GetTick(void)
{
uint32_t msPerTick = 1000 / osKernelGetTickFreq(); // 10ms
uint32_t tickMs = osKernelGetTickCount() * msPerTick;
uint32_t csPerMs = osKernelGetSysTimerFreq() / 1000; // 160K cycle/ms
uint32_t csPerTick = csPerMs * msPerTick; // 1600K cycles/tick
uint32_t restMs = osKernelGetSysTimerCount() % csPerTick / csPerMs;
return tickMs + restMs;
}
static uint32_t ssd1306_SendData(uint8_t* data, size_t size)
{
WifiIotI2cIdx id = SSD1306_I2C_IDX;
WifiIotI2cData i2cData = {0};
i2cData.sendBuf = data;
i2cData.sendLen = size;
return I2cWrite(id, SSD1306_I2C_ADDR, &i2cData);
}
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;
}
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 OLED
HAL_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 OLED
HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_RESET); // command
HAL_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 OLED
HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_SET); // data
HAL_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 OLED
ssd1306_Reset();
// Wait for the screen to boot
HAL_Delay(100);
// Init OLED
ssd1306_SetDisplayOn(0); //display off
ssd1306_WriteCommand(0x20); //Set Memory Addressing Mode
ssd1306_WriteCommand(0x00); // 00b,Horizontal Addressing Mode; 01b,Vertical Addressing Mode;
// 10b,Page Addressing Mode (RESET); 11b,Invalid
ssd1306_WriteCommand(0xB0); //Set Page Start Address for Page Addressing Mode,0-7
#ifdef SSD1306_MIRROR_VERT
ssd1306_WriteCommand(0xC0); // Mirror vertically
#else
ssd1306_WriteCommand(0xC8); //Set COM Output Scan Direction
#endif
ssd1306_WriteCommand(0x00); //---set low column address
ssd1306_WriteCommand(0x10); //---set high column address
ssd1306_WriteCommand(0x40); //--set start line address - CHECK
ssd1306_SetContrast(0xFF);
#ifdef SSD1306_MIRROR_HORIZ
ssd1306_WriteCommand(0xA0); // Mirror horizontally
#else
ssd1306_WriteCommand(0xA1); //--set segment re-map 0 to 127 - CHECK
#endif
#ifdef SSD1306_INVERSE_COLOR
ssd1306_WriteCommand(0xA7); //--set inverse color
#else
ssd1306_WriteCommand(0xA6); //--set normal color
#endif
// Set multiplex ratio.
#if (SSD1306_HEIGHT == 128)
// Found in the Luma Python lib for SH1106.
ssd1306_WriteCommand(0xFF);
#else
ssd1306_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!"
#endif
ssd1306_WriteCommand(0xA4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
ssd1306_WriteCommand(0xD3); //-set display offset - CHECK
ssd1306_WriteCommand(0x00); //-not offset
ssd1306_WriteCommand(0xD5); //--set display clock divide ratio/oscillator frequency
ssd1306_WriteCommand(0xF0); //--set divide ratio
ssd1306_WriteCommand(0xD9); //--set pre-charge period
ssd1306_WriteCommand(0x11); // 0x22 by default
ssd1306_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!"
#endif
ssd1306_WriteCommand(0xDB); //--set vcomh
ssd1306_WriteCommand(0x30); //0x20,0.77xVcc, 0x30,0.83xVcc
ssd1306_WriteCommand(0x8D); //--set DC-DC enable
ssd1306_WriteCommand(0x14); //
ssd1306_SetDisplayOn(1); //--turn on SSD1306 panel
// Clear screen
ssd1306_Fill(Black);
// Flush buffer to screen
ssd1306_UpdateScreen();
// Set default values for screen object
SSD1306.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 = (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 pages
uint8_t cmd[] = {
0X21, // 设置列起始和结束地址
0X00, // 列起始地址 0
0X7F, // 列终止地址 127
0X22, // 设置页起始和结束地址
0X00, // 页起始地址 0
0X07, // 页终止地址 7
};
uint32_t count = 0;
uint8_t data[sizeof(cmd)*2 + SSD1306_BUFFER_SIZE + 1] = {};
// copy cmd
for (uint32_t i = 0; i < sizeof(cmd)/sizeof(cmd[0]); i++) {
data[count++] = SSD1306_CTRL_CMD | SSD1306_MASK_CONT;
data[count++] = cmd;
}
// copy frame data
data[count++] = SSD1306_CTRL_DATA;
memcpy(&data[count], SSD1306_Buffer, sizeof(SSD1306_Buffer));
count += sizeof(SSD1306_Buffer);
// send to i2c bus
uint32_t retval = ssd1306_SendData(data, count);
if (retval != WIFI_IOT_SUCCESS) {
printf("ssd1306_UpdateScreen send frame data filed: %d!rn", 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 buffer
return;
}
// Check if pixel should be inverted
if(SSD1306.Inverted) {
color = (SSD1306_COLOR)!color;
}
// Draw in the right color
if(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 valid
if (ch < 32 || ch > 126)
return 0;
// Check remaining space on current line
if (SSD1306_WIDTH < (SSD1306.CurrentX + Font.FontWidth) ||
SSD1306_HEIGHT < (SSD1306.CurrentY + Font.FontHeight))
{
// Not enough space on current line
return 0;
}
// Use the font to write
for(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 taken
SSD1306.CurrentX += Font.FontWidth;
// Return written char for validation
return ch;
}
// Write full string to screenbuffer
char ssd1306_DrawString(char* str, FontDef Font, SSD1306_COLOR color) {
// Write until null-byte
while (*str) {
if (ssd1306_DrawChar(*str, Font, color) != *str) {
// Char could not be written
return *str;
}
// Next char
str++;
}
// Everything ok
return *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.x, par_vertex.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 36
float 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!rn", 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 on
SSD1306.DisplayOn = 1;
} else {
value = 0xAE; // Display off
SSD1306.DisplayOn = 0;
}
ssd1306_WriteCommand(value);
}
uint8_t ssd1306_GetDisplayOn() {
return SSD1306.DisplayOn;
}
本部分功能实现，参考与引用了许思维老师的部分公开代码。
了OLED 屏幕显示图片，特殊符号，字母，条形，圆弧，动画播放等操作。
代码量比较大，这里只展示小部分代码。
#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 "wifiiot_i2c.h"
#include "wifiiot_errno.h"
#if defined(SSD1306_USE_I2C)
#define SSD1306_I2C_IDX WIFI_IOT_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)
{
uint32_t msPerTick = 1000 / osKernelGetTickFreq(); // 10ms
if (ms >= msPerTick) {
osDelay(ms / msPerTick);
}
uint32_t restMs = ms % msPerTick;
if (restMs > 0) {
usleep(restMs * 1000);
}
}
uint32_t HAL_GetTick(void)
{
uint32_t msPerTick = 1000 / osKernelGetTickFreq(); // 10ms
uint32_t tickMs = osKernelGetTickCount() * msPerTick;
uint32_t csPerMs = osKernelGetSysTimerFreq() / 1000; // 160K cycle/ms
uint32_t csPerTick = csPerMs * msPerTick; // 1600K cycles/tick
uint32_t restMs = osKernelGetSysTimerCount() % csPerTick / csPerMs;
return tickMs + restMs;
}
static uint32_t ssd1306_SendData(uint8_t* data, size_t size)
{
WifiIotI2cIdx id = SSD1306_I2C_IDX;
WifiIotI2cData i2cData = {0};
i2cData.sendBuf = data;
i2cData.sendLen = size;
return I2cWrite(id, SSD1306_I2C_ADDR, &i2cData);
}
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;
}
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 OLED
HAL_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 OLED
HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_RESET); // command
HAL_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 OLED
HAL_GPIO_WritePin(SSD1306_DC_Port, SSD1306_DC_Pin, GPIO_PIN_SET); // data
HAL_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 OLED
ssd1306_Reset();
// Wait for the screen to boot
HAL_Delay(100);
// Init OLED
ssd1306_SetDisplayOn(0); //display off
ssd1306_WriteCommand(0x20); //Set Memory Addressing Mode
ssd1306_WriteCommand(0x00); // 00b,Horizontal Addressing Mode; 01b,Vertical Addressing Mode;
// 10b,Page Addressing Mode (RESET); 11b,Invalid
ssd1306_WriteCommand(0xB0); //Set Page Start Address for Page Addressing Mode,0-7
#ifdef SSD1306_MIRROR_VERT
ssd1306_WriteCommand(0xC0); // Mirror vertically
#else
ssd1306_WriteCommand(0xC8); //Set COM Output Scan Direction
#endif
ssd1306_WriteCommand(0x00); //---set low column address
ssd1306_WriteCommand(0x10); //---set high column address
ssd1306_WriteCommand(0x40); //--set start line address - CHECK
ssd1306_SetContrast(0xFF);
#ifdef SSD1306_MIRROR_HORIZ
ssd1306_WriteCommand(0xA0); // Mirror horizontally
#else
ssd1306_WriteCommand(0xA1); //--set segment re-map 0 to 127 - CHECK
#endif
#ifdef SSD1306_INVERSE_COLOR
ssd1306_WriteCommand(0xA7); //--set inverse color
#else
ssd1306_WriteCommand(0xA6); //--set normal color
#endif
// Set multiplex ratio.
#if (SSD1306_HEIGHT == 128)
// Found in the Luma Python lib for SH1106.
ssd1306_WriteCommand(0xFF);
#else
ssd1306_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!"
#endif
ssd1306_WriteCommand(0xA4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
ssd1306_WriteCommand(0xD3); //-set display offset - CHECK
ssd1306_WriteCommand(0x00); //-not offset
ssd1306_WriteCommand(0xD5); //--set display clock divide ratio/oscillator frequency
ssd1306_WriteCommand(0xF0); //--set divide ratio
ssd1306_WriteCommand(0xD9); //--set pre-charge period
ssd1306_WriteCommand(0x11); // 0x22 by default
ssd1306_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!"
#endif
ssd1306_WriteCommand(0xDB); //--set vcomh
ssd1306_WriteCommand(0x30); //0x20,0.77xVcc, 0x30,0.83xVcc
ssd1306_WriteCommand(0x8D); //--set DC-DC enable
ssd1306_WriteCommand(0x14); //
ssd1306_SetDisplayOn(1); //--turn on SSD1306 panel
// Clear screen
ssd1306_Fill(Black);
// Flush buffer to screen
ssd1306_UpdateScreen();
// Set default values for screen object
SSD1306.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 = (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 pages
uint8_t cmd[] = {
0X21, // 设置列起始和结束地址
0X00, // 列起始地址 0
0X7F, // 列终止地址 127
0X22, // 设置页起始和结束地址
0X00, // 页起始地址 0
0X07, // 页终止地址 7
};
uint32_t count = 0;
uint8_t data[sizeof(cmd)*2 + SSD1306_BUFFER_SIZE + 1] = {};
// copy cmd
for (uint32_t i = 0; i < sizeof(cmd)/sizeof(cmd[0]); i++) {
data[count++] = SSD1306_CTRL_CMD | SSD1306_MASK_CONT;
data[count++] = cmd;
}
// copy frame data
data[count++] = SSD1306_CTRL_DATA;
memcpy(&data[count], SSD1306_Buffer, sizeof(SSD1306_Buffer));
count += sizeof(SSD1306_Buffer);
// send to i2c bus
uint32_t retval = ssd1306_SendData(data, count);
if (retval != WIFI_IOT_SUCCESS) {
printf("ssd1306_UpdateScreen send frame data filed: %d!rn", 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 buffer
return;
}
// Check if pixel should be inverted
if(SSD1306.Inverted) {
color = (SSD1306_COLOR)!color;
}
// Draw in the right color
if(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 valid
if (ch < 32 || ch > 126)
return 0;
// Check remaining space on current line
if (SSD1306_WIDTH < (SSD1306.CurrentX + Font.FontWidth) ||
SSD1306_HEIGHT < (SSD1306.CurrentY + Font.FontHeight))
{
// Not enough space on current line
return 0;
}
// Use the font to write
for(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 taken
SSD1306.CurrentX += Font.FontWidth;
// Return written char for validation
return ch;
}
// Write full string to screenbuffer
char ssd1306_DrawString(char* str, FontDef Font, SSD1306_COLOR color) {
// Write until null-byte
while (*str) {
if (ssd1306_DrawChar(*str, Font, color) != *str) {
// Char could not be written
return *str;
}
// Next char
str++;
}
// Everything ok
return *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.x, par_vertex.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 36
float 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!rn", 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 on
SSD1306.DisplayOn = 1;
} else {
value = 0xAE; // Display off
SSD1306.DisplayOn = 0;
}
ssd1306_WriteCommand(value);
}
uint8_t ssd1306_GetDisplayOn() {
return SSD1306.DisplayOn;
}
本部分功能实现，参考与引用了许思维老师的部分公开代码。
回帖高级模式
声明：本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人，不代表电子发烧友网立场。文章及其配图仅供工程师学习之用，如有内容图片侵权或者其他问题，请联系本站作侵删。 侵权投诉