329 lines
7.9 KiB
C
329 lines
7.9 KiB
C
/*
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* SSD1306_oled.c
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*
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* Created on: Apr 5, 2021
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* Author: bartool
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*/
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#include "main.h"
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#include "SSD1306_oled.h"
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#include "string.h"
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I2C_HandleTypeDef *oled_i2c;
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#ifndef TEST
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static uint8_t buffer_oled[SSD1306_BUF_SIZE];
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#else
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uint8_t buffer_oled[SSD1306_BUF_SIZE];
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#endif
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void SSD1306_SendCommand(uint8_t cmd)
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{
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HAL_I2C_Mem_Write(oled_i2c, SSD1306_ADDRESS<<1, 0x00, 1, &cmd, 1, SSD1306_TIMEOUT);
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}
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void SSD1306_SendData(uint8_t *data, uint16_t size)
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{
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HAL_I2C_Mem_Write(oled_i2c, SSD1306_ADDRESS<<1, 0x40, 1, data, size, SSD1306_TIMEOUT);
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}
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void SSD1306_clear(uint8_t color)
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{
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switch(color)
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{
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case WHITE:
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memset(buffer_oled, 0xFF, SSD1306_BUF_SIZE);
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break;
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case BLACK:
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memset(buffer_oled, 0x00, SSD1306_BUF_SIZE);
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break;
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}
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}
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void SSD1306_display_all(void)
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{
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SSD1306_SendCommand(SSD1306_PAGEADDR);
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SSD1306_SendCommand(0);
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SSD1306_SendCommand(0xFF);
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SSD1306_SendCommand(SSD1306_COLUMNADDR);
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SSD1306_SendCommand(0);
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SSD1306_SendCommand(SSD1306_LCDWIDTH - 1);
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SSD1306_SendData(buffer_oled, SSD1306_BUF_SIZE);
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}
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uint8_t SSD1306_display_page(void)
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{
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static uint8_t page = 0;
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SSD1306_SendCommand(SSD1306_PAGEADDR);
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SSD1306_SendCommand(page);
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SSD1306_SendCommand(page);
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SSD1306_SendCommand(SSD1306_COLUMNADDR);
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SSD1306_SendCommand(0);
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SSD1306_SendCommand(SSD1306_LCDWIDTH - 1);
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SSD1306_SendData(buffer_oled + (page * SSD1306_LCDWIDTH), SSD1306_LCDWIDTH);
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// page++;
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if (++page > 7)
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{
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page = 0;
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return SSD1306_SENDALL;
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}
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else
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{
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return SSD1306_SENDPAGE;
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}
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}
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void SSD1306_Init(I2C_HandleTypeDef *i2c)
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{
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oled_i2c = i2c;
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SSD1306_SendCommand(SSD1306_DISPLAYOFF);
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SSD1306_SendCommand(SSD1306_SETDISPLAYCLOCKDIV);
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SSD1306_SendCommand(0x80);
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SSD1306_SendCommand(SSD1306_SETMULTIPLEX);
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SSD1306_SendCommand(SSD1306_LCDHEIGHT - 1);
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SSD1306_SendCommand(SSD1306_SETDISPLAYOFFSET);
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SSD1306_SendCommand(0x0);
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SSD1306_SendCommand(SSD1306_SETSTARTLINE | 0x0);
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SSD1306_SendCommand(SSD1306_CHARGEPUMP);
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SSD1306_SendCommand(0x14);
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SSD1306_SendCommand(SSD1306_MEMORYMODE);
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SSD1306_SendCommand(0x00);
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SSD1306_SendCommand(SSD1306_SEGREMAP | 0x1);
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SSD1306_SendCommand(SSD1306_COMSCANDEC);
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uint8_t comPins = 0x02;
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uint8_t contrast = 0x8F;
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if ((SSD1306_LCDWIDTH == 128) && (SSD1306_LCDHEIGHT == 32)) {
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comPins = 0x02;
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contrast = 0x0F;
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} else if ((SSD1306_LCDWIDTH == 128) && (SSD1306_LCDHEIGHT == 64)) {
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comPins = 0x12;
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contrast = 0xCF;
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} else if ((SSD1306_LCDWIDTH == 96) && (SSD1306_LCDHEIGHT == 16)) {
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comPins = 0x2; // ada x12
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contrast = 0xAF;
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}
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SSD1306_SendCommand(SSD1306_SETCOMPINS);
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SSD1306_SendCommand(comPins);
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SSD1306_SendCommand(SSD1306_SETCONTRAST);
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SSD1306_SendCommand(contrast);
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SSD1306_SendCommand(SSD1306_SETPRECHARGE); // 0xd9
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SSD1306_SendCommand(0xF1);
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SSD1306_SendCommand(SSD1306_SETVCOMDETECT);
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SSD1306_SendCommand(0x40);
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SSD1306_SendCommand(SSD1306_DISPLAYALLON_RESUME);
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SSD1306_SendCommand(SSD1306_NORMALDISPLAY);
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SSD1306_SendCommand(SSD1306_DEACTIVATE_SCROLL);
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SSD1306_SendCommand(SSD1306_DISPLAYON);
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}
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void ssd1306_set_pixel(uint8_t x, uint8_t y, uint8_t bw)
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{
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if (x > SSD1306_LCDWIDTH || y > SSD1306_LCDHEIGHT) return;
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switch (bw)
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{
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case WHITE:
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buffer_oled[(y/8) * SSD1306_LCDWIDTH + x] |= (1<<(y%8));
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break;
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case BLACK:
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buffer_oled[(y/8) * SSD1306_LCDWIDTH + x] &= ~(1<<(y%8));
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break;
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case INVERSE:
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buffer_oled[(y/8) * SSD1306_LCDWIDTH + x] ^= (1<<(y%8));
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break;
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}
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}
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// void ssd1306_write_to_buffer(const uint8_t* data, uint8_t width, uint8_t height, int8_t pos_x, int8_t pos_y)
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// {
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// int16_t max_x, max_y;
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// uint8_t shift_x = 0, temp, row = 0;
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// uint16_t buf_idx = 0, index = 0;
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// // right boundry
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// if (width + pos_x > SSD1306_LCDWIDTH) max_x = SSD1306_LCDWIDTH;
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// else max_x = width + pos_x;
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// // left boundry
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// if (pos_x < 0)
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// {
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// shift_x = pos_x * -1;
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// pos_x = 0;
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// }
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// // bottom boundry
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// if (height + pos_y > SSD1306_LCDHEIGHT) max_y = SSD1306_LCDHEIGHT;
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// else max_y = height + pos_y;
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// max_y = max_y / 8 + (max_y % 8 == 0 ? 0 : 1);
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// // top boundry
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// if (pos_y < 0)
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// {
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// uint8_t abs_pos_y = pos_y * -1;
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// row = abs_pos_y/8 + (abs_pos_y % 8 == 0 ? 0 : 1);
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// pos_y = (8 - abs_pos_y%8)%8;
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// }
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// uint8_t shift = pos_y % 8;
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// uint8_t mask_lsb = 0xFF >> (8 - shift);
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// uint8_t mask_msb = 0xFF << shift;
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// for (uint8_t y = pos_y / 8; y < max_y; y++)
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// {
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// index = width * row + shift_x;
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// for (uint8_t x = pos_x; x < max_x; x++, index++)
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// {
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// buf_idx = y * SSD1306_LCDWIDTH + x;
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// temp = buffer_oled[buf_idx];
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// if (index < width * ((height + 7) / 8))
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// temp = data[index] << shift | (temp & mask_lsb);
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// // else if (height%8 != 0)
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// // mask_msb = 0xFF << ((pos_y + height)%8);
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// if (shift != 0 && index >= width)
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// temp = data[index - width] >> (8 - shift) | (temp & mask_msb);
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// buffer_oled[buf_idx] = temp;
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// }
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// row++;
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// }
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// }
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void ssd1306_clear_buffer (uint8_t width, uint8_t height, uint8_t pos_x, uint8_t pos_y)
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{
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uint16_t max_x, max_y, index = 0, temp, row = 0;
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if (width + pos_x > SSD1306_LCDWIDTH) max_x = SSD1306_LCDWIDTH;
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else max_x = width + pos_x;
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if (height + pos_y > SSD1306_LCDHEIGHT) max_y = SSD1306_LCDHEIGHT;
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else max_y = height + pos_y;
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max_y = max_y / 8 + (max_y % 8 == 0 ? 0 : 1);
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uint8_t shift = pos_y % 8;
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uint8_t mask_right = 0xFF >> shift;
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uint8_t mask_left = 0xFF << (8 - shift);
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for (uint8_t y = pos_y / 8; y < max_y; y++, index = width * row)
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{
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for (uint8_t x = pos_x; x < max_x; x++, index++)
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{
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temp = buffer_oled[y * SSD1306_LCDWIDTH + x];
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if (index < width * height/8)
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temp &= mask_left;
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if (index >= width)
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temp &= mask_right;
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buffer_oled[y * SSD1306_LCDWIDTH + x] = temp;
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}
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row++;
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}
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}
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/**
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* @brief A function that writes a bitmap into the buffer at the given position.
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* 0,0 -------->x
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* |
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* |
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* \ /
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* y
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* @param bitmap A pointer to bitmap array.
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* @param bitmap_width Bitmap witdh in pixels.
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* @param bitmap_height Bitmap height in pixels.
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* @param pos_x Position x in the display
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* @param pos_y Position y in the display
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*/
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void SSD1306_write_to_buffer(const uint8_t* bitmap, uint8_t bitmap_width, uint8_t bitmap_height, int8_t pos_x, int8_t pos_y)
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{
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if (bitmap_width + pos_x < 0 || bitmap_height + pos_y < 0) return;
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uint16_t tmp_buf16, bitmap_idx, bitmap_max_idx;
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uint8_t buf_row_first, buf_row_last, buf_col_first, buf_col_last;
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uint8_t bitmap_col, bitmap_row, bitmap_row_first;
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uint8_t mask_buf, shift;
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if (pos_x < 0) {
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bitmap_col = pos_x * -1;
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buf_col_first = 0;
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} else {
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bitmap_col = 0;
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buf_col_first = pos_x;
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}
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if (pos_y < 0) {
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shift = (pos_y * -1);
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bitmap_row_first = shift / 8;
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buf_row_first = 0;
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} else {
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shift = pos_y;
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bitmap_row_first = 0;
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buf_row_first = pos_y / 8;
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}
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if ((bitmap_width + pos_x) > SSD1306_LCDWIDTH) {
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buf_col_last = SSD1306_LCDWIDTH;
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} else {
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buf_col_last = bitmap_width + pos_x;
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}
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if (bitmap_height + pos_y > SSD1306_LCDHEIGHT) {
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buf_row_last = SSD1306_LCDHEIGHT / 8;
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} else {
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buf_row_last = (bitmap_height + pos_y + 7) / 8;
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}
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bitmap_max_idx = bitmap_width * ((bitmap_height + 7) / 8);
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for(uint8_t col = buf_col_first; col < buf_col_last; col++, bitmap_col++)
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{
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tmp_buf16 = 0;
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bitmap_row = bitmap_row_first;
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for( uint8_t buf_row = buf_row_first; buf_row < buf_row_last; buf_row++, bitmap_row++ )
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{
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bitmap_idx = bitmap_width * bitmap_row + bitmap_col;
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mask_buf = 0;
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if (bitmap_row == 0 && pos_y > 0) {
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mask_buf |= 0xFF >> (8 - (shift % 8));
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}
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uint8_t shifted_pixels_left = (pos_y + bitmap_height) - bitmap_row * 8;
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if (shifted_pixels_left < 8) {
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mask_buf |= (0xFF << shifted_pixels_left);
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}
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tmp_buf16 |= buffer_oled[buf_row * SSD1306_LCDWIDTH + col] & mask_buf;
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if (bitmap_idx < bitmap_max_idx)
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{
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if (pos_y < 0) {
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tmp_buf16 |= bitmap[bitmap_idx] >> (shift % 8);
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} else {
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tmp_buf16 |= bitmap[bitmap_idx] << (shift % 8);
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}
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}
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buffer_oled[buf_row * SSD1306_LCDWIDTH + col] = (uint8_t) tmp_buf16;
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tmp_buf16 = tmp_buf16 >> 8;
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}
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}
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}
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