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eloraiby/stm32_ssd1306.c

Created August 20, 2021 13:59
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stm32_ssd1306.c
//
// Copyright 2020-Present (c) Wael El Oraiby
//
// 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 "stm32_ssd1306.h"
uint8_t font_8x8_regular[2048] = {
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};
uint8_t font_8x8_bold[2048] = {
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0x0E, 0x9F, 0x91, 0xB1, 0xFB, 0x4A, 0x00, 0x00, 0x3A, 0x7A, 0x40, 0x40, 0x7A, 0x7A, 0x40, 0x00, 0x38, 0x7C, 0x54, 0x55, 0x5D, 0x19, 0x00, 0x00, 0x02, 0x23, 0x75, 0x55, 0x55, 0x7D, 0x7B, 0x42, 0x21, 0x75, 0x54, 0x54, 0x7D, 0x79, 0x40, 0x00, 0x21, 0x75, 0x55, 0x54, 0x7C, 0x78, 0x40, 0x00, 0x20, 0x74, 0x57, 0x57, 0x7C, 0x78, 0x40, 0x00, 0x18, 0x3C, 0xA4, 0xA4, 0xE4, 0x40, 0x00, 0x00, 0x02, 0x3B, 0x7D, 0x55, 0x55, 0x5D, 0x1B, 0x02, 0x39, 0x7D, 0x54, 0x54, 0x5D, 0x19, 0x00, 0x00, 0x39, 0x7D, 0x55, 0x54, 0x5C, 0x18, 0x00, 0x00, 0x01, 0x45, 0x7C, 0x7C, 0x41, 0x01, 0x00, 0x00, 0x02, 0x03, 0x45, 0x7D, 0x7D, 0x43, 0x02, 0x00, 0x01, 0x45, 0x7D, 0x7C, 0x40, 0x00, 0x00, 0x00, 0x79, 0x7D, 0x16, 0x12, 0x16, 0x7D, 0x79, 0x00, 0x70, 0x78, 0x2B, 0x2B, 0x78, 0x70, 0x00, 0x00, 0x44, 0x7C, 0x7C, 0x55, 0x55, 0x45, 0x00, 0x00, 0x20, 0x74, 0x54, 0x54, 0x7C, 0x7C, 0x54, 0x54, 0x7C, 0x7E, 0x0B, 0x09, 0x7F, 0x7F, 0x49, 0x00, 0x32, 0x7B, 0x49, 0x49, 0x7B, 0x32, 0x00, 0x00, 0x32, 0x7A, 0x48, 0x48, 0x7A, 0x32, 0x00, 0x00, 0x32, 0x7A, 0x4A, 0x48, 0x78, 0x30, 0x00, 0x00, 0x3A, 0x7B, 0x41, 0x41, 0x7B, 0x7A, 0x40, 0x00, 0x3A, 0x7A, 0x42, 0x40, 0x78, 0x78, 0x40, 0x00, 0x9A, 0xBA, 0xA0, 0xA0, 0xFA, 0x7A, 0x00, 0x00, 0x01, 0x19, 0x3C, 0x66, 0x66, 0x3C, 0x19, 0x01, 0x3D, 0x7D, 0x40, 0x40, 0x7D, 0x3D, 0x00, 0x00, 0x18, 0x3C, 0x24, 0xE7, 0xE7, 0x24, 0x24, 0x00, 0x68, 0x7E, 0x7F, 0x49, 0x43, 0x66, 0x20, 0x00, 0x2B, 0x2F, 0xFC, 0xFC, 0x2F, 0x2B, 0x00, 0x00, 0xFF, 0xFF, 0x09, 0x09, 0x2F, 0xF6, 0xF8, 0xA0, 0x40, 0xC0, 0x88, 0xFE, 0x7F, 0x09, 0x03, 0x02,
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};
// static
// void
// SSD1306_write_command(SSD1306_Instance* instance, uint8_t command) {
// HAL_I2C_Mem_Write(instance->hi2c, instance->address, 0x00, 1, &command, 1, HAL_MAX_DELAY);
// }
static
void
SSD1306_write_commands(SSD1306_Instance* instance, uint8_t* commands, uint16_t size) {
HAL_I2C_Mem_Write(instance->hi2c, instance->address, 0x00, 1, commands, size, HAL_MAX_DELAY);
}
static
void
SSD1306_write_data(SSD1306_Instance* instance, uint8_t* data, uint16_t size) {
HAL_I2C_Mem_Write(instance->hi2c, instance->address, 0x40, 1, data, size, HAL_MAX_DELAY);
}
SSD1306_Instance*
SSD1306_init(SSD1306_Instance* instance, I2C_HandleTypeDef* hi2c) {
HAL_Delay(100);
instance->hi2c = hi2c;
instance->address = SSD1306_I2C_ADDRESS;
SSD1306_clear(instance);
if (HAL_I2C_IsDeviceReady(instance->hi2c, instance->address, 1, HAL_MAX_DELAY) != HAL_OK) {
return NULL;
}
HAL_Delay(10);
// ADAFruit translation!
uint8_t init_command_list[] = {
0xAE, // LCD off
0xD5, // clock div
0xF0, // ratio
0xA8, // multiplex
63, // LINES - 1
0xD3, // display offset
0x00, // is 0
0x40, // set start line
0x8D, // set vcc
0x14, // external
0x20, // memory mode
0x10, // page mode
0xA1, // seg remap
0xC8, // coms can decrement
0x00,
0xDA, // coms pins
0x12, // 128x32
0x81, // contrast
0x55, // high
0xD9, // set precharge,
0x22,
0xDB, // com detect,
0x40,
0xA4, // delay on resume
0xA6, // normal display
0x2E, // deactivate scroll
0xAF, // LCD on
};
SSD1306_write_commands(instance, init_command_list, sizeof(init_command_list));
SSD1306_flush(instance);
return instance;
}
void
SSD1306_flush(SSD1306_Instance* instance) {
uint8_t l;
for (l = 0; l < 8; l++) {
uint8_t cmds[] = {
0xB0 + l,
0x00,
0x10,
};
SSD1306_write_commands(instance, cmds, sizeof(cmds));
SSD1306_write_data(instance, &(instance->buffer[SSD1306_WIDTH * l]), SSD1306_WIDTH);
}
}
static
void
SSD1306_write_char(SSD1306_Instance* instance, uint8_t cx, uint8_t cy, char ch, FONT_TYPE ty) {
uint8_t* font = (ty == FONT_REGULAR) ? font_8x8_regular : font_8x8_bold;
for(uint8_t x = 0; x < 8; ++x) {
uint8_t byte = font[ch * 8 + x];
for(uint8_t y = 0; y < 8; ++y) {
if( byte & (1 << y) ) {
SSD1306_set_pixel(instance, cx + x, cy + y);
} else {
SSD1306_clear_pixel(instance, cx + x, cy + y);
}
}
}
}
void
SSD1306_write_string(SSD1306_Instance* instance, uint8_t cx, uint8_t cy, char* str, FONT_TYPE ty) {
while (*str) {
if(*str == '\n') {
cx = 0;
cy += 8;
}
SSD1306_write_char(instance, cx, cy, *str, ty);
cx += 8;
str++;
}
}
Raw
stm32_ssd1306.h
//
// Copyright 2020-Present (c) Wael El Oraiby
//
// 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 "stm32f1xx_hal.h"
#include <stdlib.h>
#include <string.h>
enum {
SSD1306_I2C_ADDRESS = (0x3C << 1), // 0x78
SSD1306_WIDTH = 128,
SSD1306_HEIGHT = 64,
};
typedef enum {
FONT_REGULAR = 0,
FONT_BOLD = 1,
} FONT_TYPE;
typedef struct {
I2C_HandleTypeDef* hi2c; // i2c port
uint8_t address; // i2c address
uint8_t buffer[SSD1306_WIDTH * SSD1306_HEIGHT / 8];
} SSD1306_Instance;
SSD1306_Instance* SSD1306_init (SSD1306_Instance* instance, I2C_HandleTypeDef* hi2c);
void SSD1306_flush (SSD1306_Instance* instance);
static inline void SSD1306_clear (SSD1306_Instance* instance) { memset(instance->buffer, 0, sizeof(instance->buffer)); }
static inline void SSD1306_fill (SSD1306_Instance* instance) { memset(instance->buffer, 0xFF, sizeof(instance->buffer)); }
void SSD1306_write_string(SSD1306_Instance* instance, uint8_t cx, uint8_t cy, char* str, FONT_TYPE ty);
static inline
void
SSD1306_set_pixel(SSD1306_Instance* instance, uint8_t x, uint8_t y) {
x &= 0x7F;
y &= 0x3F;
instance->buffer[x + (y / 8) * SSD1306_WIDTH] |= 1 << (y % 8);
}
static inline
void
SSD1306_clear_pixel(SSD1306_Instance* instance, uint8_t x, uint8_t y) {
x &= 0x7F;
y &= 0x3F;
instance->buffer[x + (y / 8) * SSD1306_WIDTH] &= ~(1 << (y % 8));
}
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