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// Copyright 2021 IOsetting <iosetting(at)outlook.com>
//
// 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.
#include "ssd1306.h"
/* Absolute value */
#define ABS(x) ((x) > 0 ? (x) : -(x))
#if SSD1306_MODE_I2C
extern I2C_HandleTypeDef hi2c;
#else
extern SPI_HandleTypeDef hspi;
#endif
/* SSD1306 data buffer */
static uint8_t SSD1306_Buffer_all[SSD1306_WIDTH * SSD1306_HEIGHT / 8];
/* Private SSD1306 structure */
typedef struct {
uint16_t CurrentX;
uint16_t CurrentY;
uint8_t Inverted;
uint8_t Initialized;
} SSD1306_t;
/* Private variable */
static SSD1306_t SSD1306;
uint8_t SSD1306_Init(void)
{
#if SSD1306_MODE_I2C
HAL_Delay(100);
#else
SSD1306_RESET_LOW;
HAL_Delay(50);
SSD1306_RESET_HIGH;
HAL_Delay(50);
#endif
/* Init LCD */
SSD1306_WriteCommand(0xAE); //display off
/**
* Set the lower start column address of pointer by command 00h~0Fh.
* Set the upper start column address of pointer by command 10h~1Fh.
*/
SSD1306_WriteCommand(0x00); //---set low column address
SSD1306_WriteCommand(0x10); //---set high column address
/** set contrast control register, 2 bytes, 0x00 - 0xFF */
SSD1306_WriteCommand(0x81);
SSD1306_WriteCommand(0x7F);
/** 0xA4,Output follows RAM content
* 0xA5,Output ignores RAM content */
SSD1306_WriteCommand(0xA4);
/** 0xA6, Normal display (RESET)
* 0xA7, Inverse display */
SSD1306_WriteCommand(0xA6);
/* 0x20,Set Memory Addressing Mode, 2 bytes,
* 0x00,Horizontal Addressing Mode (slide horizontally and goto next page)
* 0x01,Vertical Addressing Mode (slide vertically and goto next column)
* 0x02,Page Addressing Mode (RESET) (slide horizontally and remain in the same page)
* 0x03,Invalid
*/
SSD1306_WriteCommand(0x20);
SSD1306_WriteCommand(0x00);
/**
* Set the page start address of the target display location by command B0h to B7h
* For Page Addressing Mode only
*/
SSD1306_WriteCommand(0xB0);
/**
* Set Page Address, 3 bytes
* For Horizontal and Vertical Addressing Mode only
*/
SSD1306_WriteCommand(0x22);
SSD1306_WriteCommand(0x00); // From Page 0
SSD1306_WriteCommand(0x07); // To Page 7
/**
* COM Output Scan Direction
* 0xC0: normal mode (RESET) Scan from COM0 to COM[N –1]
* 0xC8: remapped mode. Scan from COM[N-1] to COM0 */
SSD1306_WriteCommand(0xC8); //Set COM Output Scan Direction
/**
* Set display RAM display start line register from 0-63 */
SSD1306_WriteCommand(0x40);
/**
* Segment Re-map
* 0xA0: column address 0 is mapped to SEG0 (RESET),
* 0xA1: column address 127 is mapped to SEG0 */
SSD1306_WriteCommand(0xA1);
/**
* Set MUX ratio to N+1 MUX
* N=A[5:0]: from 16MUX to 64MUX, RESET=111111b (i.e. 63d, 64MUX)
* A[5:0] from 0 to 14 are invalid entry.*/
SSD1306_WriteCommand(0xA8);
SSD1306_WriteCommand(0x3F);
/**
* Set Display Offset, Set vertical shift by COM from 0d~63d
* The value is reset to 00h after RESET */
SSD1306_WriteCommand(0xD3);
SSD1306_WriteCommand(0x00); // offset in vertical
/**
* Set COM Pins Hardware Configuration
* A[4]=0b, Sequential COM pin configuration
* A[4]=1b(RESET), Alternative COM pin configuration
* A[5]=0b(RESET), Disable COM Left/Right remap
* A[5]=1b, Enable COM Left/Right remap */
SSD1306_WriteCommand(0xDA);
SSD1306_WriteCommand(0x12); // A[4]=0, A[5]=1
/**
* Set Display Divide Ratio/Oscillator Frequency
* */
SSD1306_WriteCommand(0xD5);
SSD1306_WriteCommand(0xF0); // divide ratio
/**
* Set Pre-charge Period */
SSD1306_WriteCommand(0xD9);
SSD1306_WriteCommand(0x22);
/**
* Set V COMH Deselect Level
* 0x00: 0.65 * Vcc
* 0x10: 0.77 * Vcc (RESET)
* 0x11: 0.83 * Vcc
* */
SSD1306_WriteCommand(0xDB);
SSD1306_WriteCommand(0x10);
/** charge pump setting
* 0x10: Disable charge pump(RESET)
* 0x14: Enable charge pump during display on
*/
SSD1306_WriteCommand(0x8D);
SSD1306_WriteCommand(0x14);
/** 0xAE, Display OFF (sleep mode),
* 0xAF, Display ON in normal mode */
SSD1306_WriteCommand(0xAF);
/* Clear screen */
SSD1306_Fill(SSD1306_COLOR_BLACK);
/* Update screen */
SSD1306_UpdateScreen();
/* Set default values */
SSD1306.CurrentX = 0;
SSD1306.CurrentY = 0;
/* Initialized OK */
SSD1306.Initialized = 1;
/* Return OK */
return 1;
}
void SSD1306_UpdateScreen(void)
{
#if SSD1306_MODE_I2C
HAL_I2C_Write(&hi2c, SSD1306_I2C_ADDR, 0x40, SSD1306_Buffer_all, SSD1306_WIDTH * SSD1306_HEIGHT / 8);
#else
SSD1306_DC_HIGH;
SSD1306_CS_LOW;
HAL_SPI_Transmit(&hspi, SSD1306_Buffer_all, SSD1306_WIDTH * SSD1306_HEIGHT / 8, SSD1306_TIMEOUT);
SSD1306_CS_HIGH;
#endif
}
void SSD1306_ToggleInvert(void)
{
uint16_t i;
/* Toggle invert */
SSD1306.Inverted = !SSD1306.Inverted;
/* Do memory toggle */
for (i = 0; i < sizeof(SSD1306_Buffer_all); i++)
{
SSD1306_Buffer_all[i] = ~SSD1306_Buffer_all[i];
}
}
void SSD1306_Fill(uint8_t color)
{
if (SSD1306.Inverted)
{
color = (uint8_t)!color;
}
/* Set memory */
memset(SSD1306_Buffer_all, (color == SSD1306_COLOR_BLACK) ? 0x00 : 0xFF, SSD1306_WIDTH * SSD1306_HEIGHT / 8);
}
void SSD1306_DrawPixel(uint16_t x, uint16_t y, uint8_t color)
{
if (x >= SSD1306_WIDTH || y >= SSD1306_HEIGHT)
{
/* Error */
return;
}
/* Check if pixels are inverted */
if (SSD1306.Inverted)
{
color = (uint8_t)!color;
}
/* Set color */
if (color == SSD1306_COLOR_WHITE)
{
SSD1306_Buffer_all[x + (y / 8) * SSD1306_WIDTH] |= 1 << (y % 8);
}
else
{
SSD1306_Buffer_all[x + (y / 8) * SSD1306_WIDTH] &= ~(1 << (y % 8));
}
}
void SSD1306_GotoXY(uint16_t x, uint16_t y)
{
/* Set write pointers */
SSD1306.CurrentX = x;
SSD1306.CurrentY = y;
}
char SSD1306_Putc(char ch, FontDef_t* font, uint8_t color)
{
uint32_t i, b, j, k;
for (i = 0; i < font->height; i++)
{
for (j = 0; j < font->bytes; j++)
{
b = font->data[((ch - 32) * font->height + i) * font->bytes + j];
if (font->order == 0)
{
for (k = 0; k < 8 && k < font->width - j * 8; k++)
{
if ((b << k) & 0x80)
{
SSD1306_DrawPixel(SSD1306.CurrentX + (j * 8) + k, (SSD1306.CurrentY + i), (uint8_t) color);
}
else
{
SSD1306_DrawPixel(SSD1306.CurrentX + (j * 8) + k, (SSD1306.CurrentY + i), (uint8_t) !color);
}
}
}
else
{
for (k = 0; k < 8 && k < font->width - j * 8; k++)
{
if (b & (0x0001 << k))
{
SSD1306_DrawPixel(SSD1306.CurrentX + (j * 8) + k, (SSD1306.CurrentY + i), (uint8_t) color);
}
else
{
SSD1306_DrawPixel(SSD1306.CurrentX + (j * 8) + k, (SSD1306.CurrentY + i), (uint8_t) !color);
}
}
}
}
}
/* Increase pointer */
SSD1306.CurrentX += font->width;
/* Return character written */
return ch;
}
char SSD1306_Puts(char* str, FontDef_t* Font, uint8_t color)
{
/* Write characters */
while (*str)
{
/* Write character by character */
if (SSD1306_Putc(*str, Font, color) != *str)
{
/* Return error */
return *str;
}
/* Increase string pointer */
str++;
}
/* Everything OK, zero should be returned */
return *str;
}
void SSD1306_DrawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint8_t c)
{
int16_t dx, dy, sx, sy, err, e2, i, tmp;
/* Check for overflow */
if (x0 >= SSD1306_WIDTH)
{
x0 = SSD1306_WIDTH - 1;
}
if (x1 >= SSD1306_WIDTH)
{
x1 = SSD1306_WIDTH - 1;
}
if (y0 >= SSD1306_HEIGHT)
{
y0 = SSD1306_HEIGHT - 1;
}
if (y1 >= SSD1306_HEIGHT)
{
y1 = SSD1306_HEIGHT - 1;
}
dx = (x0 < x1) ? (x1 - x0) : (x0 - x1);
dy = (y0 < y1) ? (y1 - y0) : (y0 - y1);
sx = (x0 < x1) ? 1 : -1;
sy = (y0 < y1) ? 1 : -1;
err = ((dx > dy) ? dx : -dy) / 2;
if (dx == 0)
{
if (y1 < y0)
{
tmp = y1;
y1 = y0;
y0 = tmp;
}
if (x1 < x0)
{
tmp = x1;
x1 = x0;
x0 = tmp;
}
/* Vertical line */
for (i = y0; i <= y1; i++)
{
SSD1306_DrawPixel(x0, i, c);
}
/* Return from function */
return;
}
if (dy == 0)
{
if (y1 < y0)
{
tmp = y1;
y1 = y0;
y0 = tmp;
}
if (x1 < x0)
{
tmp = x1;
x1 = x0;
x0 = tmp;
}
/* Horizontal line */
for (i = x0; i <= x1; i++)
{
SSD1306_DrawPixel(i, y0, c);
}
/* Return from function */
return;
}
while (1)
{
SSD1306_DrawPixel(x0, y0, c);
if (x0 == x1 && y0 == y1)
{
break;
}
e2 = err;
if (e2 > -dx)
{
err -= dy;
x0 += sx;
}
if (e2 < dy)
{
err += dx;
y0 += sy;
}
}
}
void SSD1306_DrawCircle(int16_t x0, int16_t y0, int16_t r, uint8_t c)
{
int16_t f = 1 - r;
int16_t ddF_x = 1;
int16_t ddF_y = -2 * r;
int16_t x = 0;
int16_t y = r;
SSD1306_DrawPixel(x0, y0 + r, c);
SSD1306_DrawPixel(x0, y0 - r, c);
SSD1306_DrawPixel(x0 + r, y0, c);
SSD1306_DrawPixel(x0 - r, y0, c);
while (x < y)
{
if (f >= 0)
{
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;
SSD1306_DrawPixel(x0 + x, y0 + y, c);
SSD1306_DrawPixel(x0 - x, y0 + y, c);
SSD1306_DrawPixel(x0 + x, y0 - y, c);
SSD1306_DrawPixel(x0 - x, y0 - y, c);
SSD1306_DrawPixel(x0 + y, y0 + x, c);
SSD1306_DrawPixel(x0 - y, y0 + x, c);
SSD1306_DrawPixel(x0 + y, y0 - x, c);
SSD1306_DrawPixel(x0 - y, y0 - x, c);
}
}
void SSD1306_Image(uint8_t *img, uint8_t frame, uint8_t x, uint8_t y)
{
uint32_t i, b, j;
b = 0;
if(frame >= img[2])
return;
uint32_t start = (frame * (img[3] + (img[4] << 8)));
/* Go through font */
for (i = 0; i < img[1]; i++) {
for (j = 0; j < img[0]; j++) {
SSD1306_DrawPixel(x + j, (y + i), (uint8_t) (img[b/8 + 5 + start] >> (b%8)) & 1);
b++;
}
}
}
void SSD1306_ON(void)
{
SSD1306_WriteCommand(0x8D);
SSD1306_WriteCommand(0x14);
SSD1306_WriteCommand(0xAF);
}
void SSD1306_OFF(void)
{
SSD1306_WriteCommand(0x8D);
SSD1306_WriteCommand(0x10);
SSD1306_WriteCommand(0xAE);
}
void SSD1306_WriteCommand(uint8_t command)
{
#if SSD1306_MODE_I2C
HAL_I2C_Write(&hi2c, SSD1306_I2C_ADDR, 0x00, &command, 1);
// Fix: add 1ms delay to make it work under low i2c clock
HAL_Delay(1);
#else
SSD1306_DC_LOW;
SSD1306_CS_LOW;
HAL_SPI_Transmit(&hspi, &command, 1, SSD1306_TIMEOUT);
SSD1306_CS_HIGH;
SSD1306_DC_HIGH;
#endif
}
void SSD1306_WriteData(uint8_t data)
{
#if SSD1306_MODE_I2C
HAL_I2C_Write(&hi2c, SSD1306_I2C_ADDR, 0x40, &data, 1);
#else
SSD1306_CS_LOW;
HAL_SPI_Transmit(&hspi, &data, 1, SSD1306_TIMEOUT);
SSD1306_CS_HIGH;
#endif
}
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