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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | mjames | 1 | /********************************************************************* |
| 4 | mjames | 2 | This is a library for our Monochrome OLEDs based on SSD1306 drivers |
| 2 | mjames | 3 | |
| 4 | mjames | 4 | Pick one up today in the adafruit shop! |
| 5 | ------> http://www.adafruit.com/category/63_98 |
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| 2 | mjames | 6 | |
| 4 | mjames | 7 | These displays use SPI to communicate, 4 or 5 pins are required to |
| 8 | interface |
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| 2 | mjames | 9 | |
| 4 | mjames | 10 | Adafruit invests time and resources providing this open source code, |
| 11 | please support Adafruit and open-source hardware by purchasing |
||
| 12 | products from Adafruit! |
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| 2 | mjames | 13 | |
| 4 | mjames | 14 | Written by Limor Fried/Ladyada for Adafruit Industries. |
| 15 | BSD license, check license.txt for more information |
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| 16 | All text above, and the splash screen below must be included in any redistribution |
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| 2 | mjames | 17 | |
| 4 | mjames | 18 | This code is taken from the ADAfruit library - it is used for playing with an OLED screen |
| 2 | mjames | 19 | |
| 4 | mjames | 20 | *********************************************************************/ |
| 2 | mjames | 21 | #include <stdint.h> |
| 22 | #include <string.h> |
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| 5 | mjames | 23 | #include "SSD1306.h" |
| 30 | mjames | 24 | #include "stm32l1xx_hal.h" |
| 2 | mjames | 25 | |
| 5 | mjames | 26 | |
| 2 | mjames | 27 | #define swap(x,y) { typeof(x)t = x; x=y; y=t; } |
| 28 | #define abs(x) ((x)>0?(x):-(x)) |
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| 29 | |||
| 30 | static uint8_t rotation = 0; |
||
| 4 | mjames | 31 | const uint16_t WIDTH = SSD1306_LCDWIDTH; |
| 2 | mjames | 32 | const uint16_t HEIGHT = SSD1306_LCDHEIGHT; |
| 33 | |||
| 34 | extern SPI_HandleTypeDef hspi1; |
||
| 35 | |||
| 36 | // the memory buffer for the LCD |
||
| 37 | |||
| 38 | // pointer to the current display - affects buffer used and also chipselect |
||
| 39 | static int cd = 0; |
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| 40 | |||
| 4 | mjames | 41 | uint8_t display_buffer[MAX_PHYS_DISPLAYS][SSD1306_LCDHEIGHT * SSD1306_LCDWIDTH |
| 42 | / 8]; |
||
| 2 | mjames | 43 | |
| 4 | mjames | 44 | inline uint8_t * display_address(void) { |
| 45 | return (uint8_t *) (&display_buffer[cd]); |
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| 2 | mjames | 46 | } |
| 47 | |||
| 4 | mjames | 48 | inline uint8_t getRotation(void) { |
| 2 | mjames | 49 | return rotation; |
| 50 | } |
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| 51 | |||
| 4 | mjames | 52 | inline int16_t width(void) { |
| 53 | switch (rotation) { |
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| 2 | mjames | 54 | case 0: |
| 55 | return WIDTH; |
||
| 56 | break; |
||
| 57 | case 1: |
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| 58 | return WIDTH; |
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| 59 | break; |
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| 60 | case 2: |
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| 61 | return HEIGHT; |
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| 62 | break; |
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| 63 | case 3: |
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| 64 | return -WIDTH; |
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| 65 | break; |
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| 4 | mjames | 66 | } |
| 67 | return 0; |
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| 2 | mjames | 68 | } |
| 69 | |||
| 4 | mjames | 70 | inline int16_t height(void) { |
| 71 | switch (rotation) { |
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| 2 | mjames | 72 | case 0: |
| 73 | return HEIGHT; |
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| 74 | break; |
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| 75 | case 1: |
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| 76 | return HEIGHT; |
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| 77 | break; |
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| 78 | case 2: |
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| 79 | return WIDTH; |
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| 80 | break; |
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| 81 | case 3: |
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| 82 | return -HEIGHT; |
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| 83 | break; |
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| 4 | mjames | 84 | } |
| 2 | mjames | 85 | return 0; |
| 86 | } |
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| 87 | |||
| 4 | mjames | 88 | inline void fastSPIwrite(uint8_t d) { |
| 89 | uint8_t buffer[1]; |
||
| 90 | buffer[0] = d; |
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| 2 | mjames | 91 | // todo chipselect based on 'cd' buffer choice |
| 5 | mjames | 92 | if(cd==0) |
| 93 | { |
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| 94 | HAL_GPIO_WritePin(SPI_NSS1_GPIO_Port, SPI_NSS1_Pin, GPIO_PIN_RESET); |
||
| 95 | } |
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| 96 | if(cd==1) |
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| 97 | { |
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| 98 | HAL_GPIO_WritePin(SPI_NSS2_GPIO_Port, SPI_NSS2_Pin, GPIO_PIN_RESET); |
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| 99 | } |
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| 2 | mjames | 100 | |
| 5 | mjames | 101 | |
| 4 | mjames | 102 | HAL_SPI_Transmit(&hspi1, buffer, 1, 2); |
| 2 | mjames | 103 | |
| 5 | mjames | 104 | if(cd==0) |
| 105 | { |
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| 106 | HAL_GPIO_WritePin(SPI_NSS1_GPIO_Port, SPI_NSS1_Pin, GPIO_PIN_SET); |
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| 107 | } |
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| 108 | if(cd==1) |
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| 109 | { |
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| 110 | HAL_GPIO_WritePin(SPI_NSS2_GPIO_Port, SPI_NSS2_Pin, GPIO_PIN_SET); |
||
| 111 | } |
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| 112 | |||
| 113 | |||
| 114 | |||
| 2 | mjames | 115 | } |
| 116 | |||
| 117 | // the most basic function, set a single pixel |
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| 118 | inline void drawPixel(int16_t x, int16_t y, uint16_t color) { |
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| 4 | mjames | 119 | if ((x < 0) || (x >= width()) || (y < 0) || (y >= height())) |
| 120 | return; |
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| 2 | mjames | 121 | |
| 4 | mjames | 122 | // check rotation, move pixel around if necessary |
| 123 | switch (getRotation()) { |
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| 124 | case 1: |
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| 125 | swap(x, y) |
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| 126 | ; |
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| 127 | x = WIDTH - x - 1; |
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| 128 | break; |
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| 129 | case 2: |
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| 130 | x = WIDTH - x - 1; |
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| 131 | y = HEIGHT - y - 1; |
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| 132 | break; |
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| 133 | case 3: |
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| 134 | swap(x, y) |
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| 135 | ; |
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| 136 | y = HEIGHT - y - 1; |
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| 137 | break; |
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| 138 | } |
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| 2 | mjames | 139 | |
| 4 | mjames | 140 | // x is which column |
| 141 | switch (color) { |
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| 142 | case BLACK: |
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| 143 | display_buffer[cd][x + (y / 8) * SSD1306_LCDWIDTH] &= ~(1 << (y & 7)); |
||
| 144 | break; |
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| 2 | mjames | 145 | |
| 4 | mjames | 146 | default: |
| 147 | case WHITE: |
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| 148 | display_buffer[cd][x + (y / 8) * SSD1306_LCDWIDTH] |= (1 << (y & 7)); |
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| 149 | break; |
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| 2 | mjames | 150 | |
| 4 | mjames | 151 | case INVERT: |
| 152 | display_buffer[cd][x + (y / 8) * SSD1306_LCDWIDTH] ^= (1 << (y & 7)); |
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| 153 | break; |
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| 154 | } |
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| 2 | mjames | 155 | } |
| 156 | |||
| 157 | void ssd1306_begin(uint8_t vccstate, uint8_t i2caddr) { |
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| 158 | |||
| 4 | mjames | 159 | HAL_GPIO_WritePin(SPI_RESET_GPIO_Port, SPI_RESET_Pin, GPIO_PIN_SET); |
| 2 | mjames | 160 | |
| 4 | mjames | 161 | // VDD (3.3V) goes high at start, lets just chill for a ms |
| 162 | HAL_Delay(1); |
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| 163 | // bring reset low |
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| 164 | HAL_GPIO_WritePin(SPI_RESET_GPIO_Port, SPI_RESET_Pin, GPIO_PIN_RESET); |
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| 165 | // wait 10ms |
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| 166 | HAL_Delay(10); |
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| 167 | // bring out of reset |
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| 168 | HAL_GPIO_WritePin(SPI_RESET_GPIO_Port, SPI_RESET_Pin, GPIO_PIN_SET); |
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| 169 | // turn on VCC (9V?) |
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| 2 | mjames | 170 | |
| 4 | mjames | 171 | for (cd = 0; cd < 2; cd++) { |
| 5 | mjames | 172 | select_display(cd); |
| 4 | mjames | 173 | #if defined SSD1306_128_32 |
| 174 | // Init sequence for 128x32 OLED module |
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| 175 | ssd1306_command(SSD1306_DISPLAYOFF);// 0xAE |
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| 176 | ssd1306_command(SSD1306_SETDISPLAYCLOCKDIV);// 0xD5 |
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| 177 | ssd1306_command(0x80);// the suggested ratio 0x80 |
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| 178 | ssd1306_command(SSD1306_SETMULTIPLEX);// 0xA8 |
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| 179 | ssd1306_command(0x1F); |
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| 180 | ssd1306_command(SSD1306_SETDISPLAYOFFSET);// 0xD3 |
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| 181 | ssd1306_command(0x0);// no offset |
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| 182 | ssd1306_command(SSD1306_SETSTARTLINE | 0x0);// line #0 |
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| 183 | ssd1306_command(SSD1306_CHARGEPUMP);// 0x8D |
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| 184 | if (vccstate == SSD1306_EXTERNALVCC) |
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| 185 | { ssd1306_command(0x10);} |
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| 186 | else |
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| 187 | { ssd1306_command(0x14);} |
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| 188 | ssd1306_command(SSD1306_MEMORYMODE); // 0x20 |
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| 189 | ssd1306_command(0x00);// 0x0 act like ks0108 |
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| 190 | ssd1306_command(SSD1306_SEGREMAP | 0x1); |
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| 191 | ssd1306_command(SSD1306_COMSCANDEC); |
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| 192 | ssd1306_command(SSD1306_SETCOMPINS);// 0xDA |
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| 193 | ssd1306_command(0x02); |
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| 194 | ssd1306_command(SSD1306_SETCONTRAST);// 0x81 |
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| 195 | ssd1306_command(0x8F); |
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| 196 | ssd1306_command(SSD1306_SETPRECHARGE);// 0xd9 |
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| 197 | if (vccstate == SSD1306_EXTERNALVCC) |
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| 198 | { ssd1306_command(0x22);} |
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| 199 | else |
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| 200 | { ssd1306_command(0xF1);} |
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| 201 | ssd1306_command(SSD1306_SETVCOMDETECT); // 0xDB |
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| 202 | ssd1306_command(0x40); |
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| 203 | ssd1306_command(SSD1306_DISPLAYALLON_RESUME);// 0xA4 |
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| 204 | ssd1306_command(SSD1306_NORMALDISPLAY);// 0xA6 |
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| 205 | #endif |
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| 2 | mjames | 206 | |
| 4 | mjames | 207 | #if defined SSD1306_128_64 |
| 208 | // Init sequence for 128x64 OLED module |
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| 209 | ssd1306_command(SSD1306_DISPLAYOFF); // 0xAE |
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| 210 | ssd1306_command(SSD1306_SETDISPLAYCLOCKDIV); // 0xD5 |
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| 211 | ssd1306_command(0x80); // the suggested ratio 0x80 |
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| 212 | ssd1306_command(SSD1306_SETMULTIPLEX); // 0xA8 |
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| 213 | ssd1306_command(0x3F); |
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| 214 | ssd1306_command(SSD1306_SETDISPLAYOFFSET); // 0xD3 |
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| 215 | ssd1306_command(0x0); // no offset |
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| 216 | ssd1306_command(SSD1306_SETSTARTLINE | 0x0); // line #0 |
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| 217 | ssd1306_command(SSD1306_CHARGEPUMP); // 0x8D |
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| 218 | if (vccstate == SSD1306_EXTERNALVCC) { |
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| 219 | ssd1306_command(0x10); |
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| 220 | } else { |
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| 221 | ssd1306_command(0x14); |
||
| 222 | } |
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| 223 | ssd1306_command(SSD1306_MEMORYMODE); // 0x20 |
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| 224 | ssd1306_command(0x00); // 0x0 act like ks0108 |
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| 225 | ssd1306_command(SSD1306_SEGREMAP | 0x1); |
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| 226 | ssd1306_command(SSD1306_COMSCANDEC); |
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| 227 | ssd1306_command(SSD1306_SETCOMPINS); // 0xDA |
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| 228 | ssd1306_command(0x12); |
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| 229 | ssd1306_command(SSD1306_SETCONTRAST); // 0x81 |
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| 230 | if (vccstate == SSD1306_EXTERNALVCC) { |
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| 231 | ssd1306_command(0x9F); |
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| 232 | } else { |
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| 233 | ssd1306_command(0xCF); |
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| 234 | } |
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| 235 | ssd1306_command(SSD1306_SETPRECHARGE); // 0xd9 |
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| 236 | if (vccstate == SSD1306_EXTERNALVCC) { |
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| 237 | ssd1306_command(0x22); |
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| 238 | } else { |
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| 239 | ssd1306_command(0xF1); |
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| 240 | } |
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| 241 | ssd1306_command(SSD1306_SETVCOMDETECT); // 0xDB |
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| 242 | ssd1306_command(0x40); |
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| 243 | ssd1306_command(SSD1306_DISPLAYALLON_RESUME); // 0xA4 |
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| 244 | ssd1306_command(SSD1306_NORMALDISPLAY); // 0xA6 |
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| 245 | #endif |
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| 2 | mjames | 246 | |
| 4 | mjames | 247 | ssd1306_command(SSD1306_DISPLAYON); //--turn on oled panel |
| 248 | } |
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| 5 | mjames | 249 | select_display(0); |
| 2 | mjames | 250 | } |
| 251 | |||
| 252 | void invertDisplay(uint8_t i) { |
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| 4 | mjames | 253 | if (i) { |
| 254 | ssd1306_command(SSD1306_INVERTDISPLAY); |
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| 255 | } else { |
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| 256 | ssd1306_command(SSD1306_NORMALDISPLAY); |
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| 257 | } |
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| 2 | mjames | 258 | } |
| 259 | |||
| 4 | mjames | 260 | void ssd1306_command(uint8_t c) { |
| 261 | HAL_GPIO_WritePin(SPI1CD_GPIO_Port, SPI1CD_Pin, GPIO_PIN_RESET); |
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| 2 | mjames | 262 | |
| 4 | mjames | 263 | fastSPIwrite(c); |
| 2 | mjames | 264 | |
| 265 | } |
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| 266 | |||
| 267 | // startscrollright |
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| 268 | // Activate a right handed scroll for rows start through stop |
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| 269 | // Hint, the display is 16 rows tall. To scroll the whole display, run: |
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| 270 | // display.scrollright(0x00, 0x0F) |
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| 4 | mjames | 271 | void startscrollright(uint8_t start, uint8_t stop) { |
| 2 | mjames | 272 | ssd1306_command(SSD1306_RIGHT_HORIZONTAL_SCROLL); |
| 273 | ssd1306_command(0X00); |
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| 274 | ssd1306_command(start); |
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| 275 | ssd1306_command(0X00); |
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| 276 | ssd1306_command(stop); |
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| 277 | ssd1306_command(0X00); |
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| 278 | ssd1306_command(0XFF); |
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| 279 | ssd1306_command(SSD1306_ACTIVATE_SCROLL); |
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| 280 | } |
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| 281 | |||
| 282 | // startscrollleft |
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| 283 | // Activate a right handed scroll for rows start through stop |
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| 284 | // Hint, the display is 16 rows tall. To scroll the whole display, run: |
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| 285 | // display.scrollright(0x00, 0x0F) |
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| 4 | mjames | 286 | void startscrollleft(uint8_t start, uint8_t stop) { |
| 2 | mjames | 287 | ssd1306_command(SSD1306_LEFT_HORIZONTAL_SCROLL); |
| 288 | ssd1306_command(0X00); |
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| 289 | ssd1306_command(start); |
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| 290 | ssd1306_command(0X00); |
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| 291 | ssd1306_command(stop); |
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| 292 | ssd1306_command(0X00); |
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| 293 | ssd1306_command(0XFF); |
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| 294 | ssd1306_command(SSD1306_ACTIVATE_SCROLL); |
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| 295 | } |
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| 296 | |||
| 297 | // startscrolldiagright |
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| 298 | // Activate a diagonal scroll for rows start through stop |
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| 299 | // Hint, the display is 16 rows tall. To scroll the whole display, run: |
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| 300 | // display.scrollright(0x00, 0x0F) |
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| 4 | mjames | 301 | void startscrolldiagright(uint8_t start, uint8_t stop) { |
| 302 | ssd1306_command(SSD1306_SET_VERTICAL_SCROLL_AREA); |
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| 2 | mjames | 303 | ssd1306_command(0X00); |
| 304 | ssd1306_command(SSD1306_LCDHEIGHT); |
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| 305 | ssd1306_command(SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL); |
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| 306 | ssd1306_command(0X00); |
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| 307 | ssd1306_command(start); |
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| 308 | ssd1306_command(0X00); |
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| 309 | ssd1306_command(stop); |
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| 310 | ssd1306_command(0X01); |
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| 311 | ssd1306_command(SSD1306_ACTIVATE_SCROLL); |
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| 312 | } |
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| 313 | |||
| 314 | // startscrolldiagleft |
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| 315 | // Activate a diagonal scroll for rows start through stop |
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| 316 | // Hint, the display is 16 rows tall. To scroll the whole display, run: |
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| 317 | // display.scrollright(0x00, 0x0F) |
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| 4 | mjames | 318 | void startscrolldiagleft(uint8_t start, uint8_t stop) { |
| 319 | ssd1306_command(SSD1306_SET_VERTICAL_SCROLL_AREA); |
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| 2 | mjames | 320 | ssd1306_command(0X00); |
| 321 | ssd1306_command(SSD1306_LCDHEIGHT); |
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| 322 | ssd1306_command(SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL); |
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| 323 | ssd1306_command(0X00); |
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| 324 | ssd1306_command(start); |
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| 325 | ssd1306_command(0X00); |
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| 326 | ssd1306_command(stop); |
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| 327 | ssd1306_command(0X01); |
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| 328 | ssd1306_command(SSD1306_ACTIVATE_SCROLL); |
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| 329 | } |
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| 330 | |||
| 4 | mjames | 331 | void stopscroll(void) { |
| 2 | mjames | 332 | ssd1306_command(SSD1306_DEACTIVATE_SCROLL); |
| 333 | } |
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| 334 | |||
| 335 | // Dim the display |
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| 336 | // dim = true: display is dimmed |
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| 337 | // dim = false: display is normal |
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| 4 | mjames | 338 | void dim(uint8_t dim) { |
| 339 | uint8_t contrast; |
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| 2 | mjames | 340 | |
| 4 | mjames | 341 | if (dim) { |
| 342 | contrast = 0; // Dimmed display |
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| 343 | } else { |
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| 344 | contrast = 0xCF; |
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| 345 | } |
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| 346 | // the range of contrast to too small to be really useful |
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| 347 | // it is useful to dim the display |
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| 348 | ssd1306_command(SSD1306_SETCONTRAST); |
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| 349 | ssd1306_command(contrast); |
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| 2 | mjames | 350 | } |
| 351 | |||
| 352 | void display(void) { |
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| 4 | mjames | 353 | ssd1306_command(SSD1306_COLUMNADDR); |
| 354 | ssd1306_command(0); // Column start address (0 = reset) |
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| 355 | ssd1306_command(131); // Column end address (127 = reset) |
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| 2 | mjames | 356 | |
| 4 | mjames | 357 | ssd1306_command(SSD1306_PAGEADDR); |
| 358 | ssd1306_command(0); // Page start address (0 = reset) |
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| 359 | ssd1306_command((SSD1306_LCDHEIGHT == 64) ? 7 : 3); // Page end address |
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| 2 | mjames | 360 | |
| 4 | mjames | 361 | int row; |
| 362 | int col = 2; |
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| 363 | for (row = 0; row < SSD1306_LCDHEIGHT / 8; row++) { |
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| 364 | // set the cursor to |
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| 365 | ssd1306_command(0xB0 + row); //set page address |
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| 366 | ssd1306_command(col & 0xf); //set lower column address |
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| 367 | ssd1306_command(0x10 | (col >> 4)); //set higher column address |
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| 2 | mjames | 368 | |
| 5 | mjames | 369 | |
| 4 | mjames | 370 | HAL_GPIO_WritePin(SPI1CD_GPIO_Port, SPI1CD_Pin, GPIO_PIN_SET); |
| 5 | mjames | 371 | if(cd==0) |
| 372 | { |
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| 373 | HAL_GPIO_WritePin(SPI_NSS1_GPIO_Port, SPI_NSS1_Pin, GPIO_PIN_RESET); |
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| 374 | } |
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| 375 | if(cd==1) |
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| 376 | { |
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| 377 | HAL_GPIO_WritePin(SPI_NSS2_GPIO_Port, SPI_NSS2_Pin, GPIO_PIN_RESET); |
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| 378 | } |
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| 379 | |||
| 380 | |||
| 381 | |||
| 382 | |||
| 4 | mjames | 383 | HAL_SPI_Transmit(&hspi1, |
| 384 | (uint8_t *) (&display_buffer[cd]) + row * SSD1306_LCDWIDTH, |
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| 385 | SSD1306_LCDWIDTH, 100); |
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| 5 | mjames | 386 | if(cd==0) |
| 387 | { |
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| 388 | HAL_GPIO_WritePin(SPI_NSS1_GPIO_Port, SPI_NSS1_Pin, GPIO_PIN_SET); |
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| 389 | } |
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| 390 | if(cd==1) |
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| 391 | { |
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| 392 | HAL_GPIO_WritePin(SPI_NSS2_GPIO_Port, SPI_NSS2_Pin, GPIO_PIN_SET); |
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| 393 | } |
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| 7 | mjames | 394 | HAL_GPIO_WritePin(SPI1CD_GPIO_Port, SPI1CD_Pin, GPIO_PIN_RESET); |
| 5 | mjames | 395 | |
| 4 | mjames | 396 | } |
| 2 | mjames | 397 | |
| 398 | } |
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| 399 | |||
| 400 | // clear everything |
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| 401 | void clearDisplay(void) { |
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| 4 | mjames | 402 | memset(&display_buffer[cd], 0, (SSD1306_LCDWIDTH * SSD1306_LCDHEIGHT / 8)); |
| 2 | mjames | 403 | } |
| 404 | |||
| 405 | void drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color) { |
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| 4 | mjames | 406 | boolean bSwap = false; |
| 407 | switch (rotation) { |
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| 408 | case 0: |
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| 409 | // 0 degree rotation, do nothing |
||
| 410 | break; |
||
| 411 | case 1: |
||
| 412 | // 90 degree rotation, swap x & y for rotation, then invert x |
||
| 413 | bSwap = true; |
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| 414 | swap(x, y) |
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| 415 | ; |
||
| 416 | x = WIDTH - x - 1; |
||
| 417 | break; |
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| 418 | case 2: |
||
| 419 | // 180 degree rotation, invert x and y - then shift y around for height. |
||
| 420 | x = WIDTH - x - 1; |
||
| 421 | y = HEIGHT - y - 1; |
||
| 422 | x -= (w - 1); |
||
| 423 | break; |
||
| 424 | case 3: |
||
| 425 | // 270 degree rotation, swap x & y for rotation, then invert y and adjust y for w (not to become h) |
||
| 426 | bSwap = true; |
||
| 427 | swap(x, y) |
||
| 428 | ; |
||
| 429 | y = HEIGHT - y - 1; |
||
| 430 | y -= (w - 1); |
||
| 431 | break; |
||
| 432 | } |
||
| 2 | mjames | 433 | |
| 4 | mjames | 434 | if (bSwap) { |
| 435 | drawFastVLineInternal(x, y, w, color); |
||
| 436 | } else { |
||
| 437 | drawFastHLineInternal(x, y, w, color); |
||
| 438 | } |
||
| 2 | mjames | 439 | } |
| 440 | |||
| 441 | void drawFastHLineInternal(int16_t x, int16_t y, int16_t w, uint16_t color) { |
||
| 4 | mjames | 442 | // Do bounds/limit checks |
| 443 | if (y < 0 || y >= HEIGHT) { |
||
| 444 | return; |
||
| 445 | } |
||
| 2 | mjames | 446 | |
| 4 | mjames | 447 | // make sure we don't try to draw below 0 |
| 448 | if (x < 0) { |
||
| 449 | w += x; |
||
| 450 | x = 0; |
||
| 451 | } |
||
| 2 | mjames | 452 | |
| 4 | mjames | 453 | // make sure we don't go off the edge of the display |
| 454 | if ((x + w) > WIDTH) { |
||
| 455 | w = (HEIGHT - x); |
||
| 456 | } |
||
| 2 | mjames | 457 | |
| 4 | mjames | 458 | // if our width is now negative, punt |
| 459 | if (w <= 0) { |
||
| 460 | return; |
||
| 461 | } |
||
| 2 | mjames | 462 | |
| 4 | mjames | 463 | // set up the pointer for movement through the buffer |
| 464 | register uint8_t *pBuf = display_address(); |
||
| 465 | // adjust the buffer pointer for the current row |
||
| 466 | pBuf += ((y / 8) * SSD1306_LCDWIDTH); |
||
| 467 | // and offset x columns in |
||
| 468 | pBuf += x; |
||
| 2 | mjames | 469 | |
| 4 | mjames | 470 | register uint8_t mask = 1 << (y & 7); |
| 2 | mjames | 471 | |
| 4 | mjames | 472 | if (color == WHITE) { |
| 473 | while (w--) { |
||
| 474 | *pBuf++ |= mask; |
||
| 475 | } |
||
| 476 | } else { |
||
| 477 | mask = ~mask; |
||
| 478 | while (w--) { |
||
| 479 | *pBuf++ &= mask; |
||
| 480 | } |
||
| 481 | } |
||
| 2 | mjames | 482 | } |
| 483 | |||
| 484 | void drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color) { |
||
| 4 | mjames | 485 | boolean bSwap = false; |
| 486 | switch (rotation) { |
||
| 487 | case 0: |
||
| 488 | break; |
||
| 489 | case 1: |
||
| 490 | // 90 degree rotation, swap x & y for rotation, then invert x and adjust x for h (now to become w) |
||
| 491 | bSwap = true; |
||
| 492 | swap(x, y) |
||
| 493 | ; |
||
| 494 | x = WIDTH - x - 1; |
||
| 495 | x -= (h - 1); |
||
| 496 | break; |
||
| 497 | case 2: |
||
| 498 | // 180 degree rotation, invert x and y - then shift y around for height. |
||
| 499 | x = WIDTH - x - 1; |
||
| 500 | y = HEIGHT - y - 1; |
||
| 501 | y -= (h - 1); |
||
| 502 | break; |
||
| 503 | case 3: |
||
| 504 | // 270 degree rotation, swap x & y for rotation, then invert y |
||
| 505 | bSwap = true; |
||
| 506 | swap(x, y) |
||
| 507 | ; |
||
| 508 | y = HEIGHT - y - 1; |
||
| 509 | break; |
||
| 510 | } |
||
| 2 | mjames | 511 | |
| 4 | mjames | 512 | if (bSwap) { |
| 513 | drawFastHLineInternal(x, y, h, color); |
||
| 514 | } else { |
||
| 515 | drawFastVLineInternal(x, y, h, color); |
||
| 516 | } |
||
| 2 | mjames | 517 | } |
| 518 | |||
| 519 | void drawFastVLineInternal(int16_t x, int16_t __y, int16_t __h, uint16_t color) { |
||
| 520 | |||
| 4 | mjames | 521 | // do nothing if we're off the left or right side of the screen |
| 522 | if (x < 0 || x >= WIDTH) { |
||
| 523 | return; |
||
| 524 | } |
||
| 2 | mjames | 525 | |
| 4 | mjames | 526 | // make sure we don't try to draw below 0 |
| 527 | if (__y < 0) { |
||
| 528 | // __y is negative, this will subtract enough from __h to account for __y being 0 |
||
| 529 | __h += __y; |
||
| 530 | __y = 0; |
||
| 2 | mjames | 531 | |
| 4 | mjames | 532 | } |
| 2 | mjames | 533 | |
| 4 | mjames | 534 | // make sure we don't go past the height of the display |
| 535 | if ((__y + __h) > HEIGHT) { |
||
| 536 | __h = (HEIGHT - __y); |
||
| 537 | } |
||
| 2 | mjames | 538 | |
| 4 | mjames | 539 | // if our height is now negative, punt |
| 540 | if (__h <= 0) { |
||
| 541 | return; |
||
| 542 | } |
||
| 2 | mjames | 543 | |
| 4 | mjames | 544 | // this display doesn't need ints for coordinates, use local byte registers for faster juggling |
| 545 | register uint8_t y = __y; |
||
| 546 | register uint8_t h = __h; |
||
| 2 | mjames | 547 | |
| 4 | mjames | 548 | // set up the pointer for fast movement through the buffer |
| 549 | register uint8_t *pBuf = display_address(); |
||
| 550 | // adjust the buffer pointer for the current row |
||
| 551 | pBuf += ((y / 8) * SSD1306_LCDWIDTH); |
||
| 552 | // and offset x columns in |
||
| 553 | pBuf += x; |
||
| 2 | mjames | 554 | |
| 4 | mjames | 555 | // do the first partial byte, if necessary - this requires some masking |
| 556 | register uint8_t mod = (y & 7); |
||
| 557 | if (mod) { |
||
| 558 | // mask off the high n bits we want to set |
||
| 559 | mod = 8 - mod; |
||
| 2 | mjames | 560 | |
| 4 | mjames | 561 | // note - lookup table results in a nearly 10% performance improvement in fill* functions |
| 562 | // register uint8_t mask = ~(0xFF >> (mod)); |
||
| 563 | static uint8_t premask[8] = { 0x00, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, |
||
| 564 | 0xFE }; |
||
| 565 | register uint8_t mask = premask[mod]; |
||
| 2 | mjames | 566 | |
| 4 | mjames | 567 | // adjust the mask if we're not going to reach the end of this byte |
| 568 | if (h < mod) { |
||
| 569 | mask &= (0XFF >> (mod - h)); |
||
| 570 | } |
||
| 2 | mjames | 571 | |
| 4 | mjames | 572 | if (color == WHITE) { |
| 573 | *pBuf |= mask; |
||
| 574 | } else { |
||
| 575 | *pBuf &= ~mask; |
||
| 576 | } |
||
| 2 | mjames | 577 | |
| 4 | mjames | 578 | // fast exit if we're done here! |
| 579 | if (h < mod) { |
||
| 580 | return; |
||
| 581 | } |
||
| 2 | mjames | 582 | |
| 4 | mjames | 583 | h -= mod; |
| 2 | mjames | 584 | |
| 4 | mjames | 585 | pBuf += SSD1306_LCDWIDTH; |
| 586 | } |
||
| 2 | mjames | 587 | |
| 4 | mjames | 588 | // write solid bytes while we can - effectively doing 8 rows at a time |
| 589 | if (h >= 8) { |
||
| 590 | // store a local value to work with |
||
| 591 | register uint8_t val = (color == WHITE) ? 255 : 0; |
||
| 2 | mjames | 592 | |
| 4 | mjames | 593 | do { |
| 594 | // write our value in |
||
| 595 | *pBuf = val; |
||
| 2 | mjames | 596 | |
| 4 | mjames | 597 | // adjust the buffer forward 8 rows worth of data |
| 598 | pBuf += SSD1306_LCDWIDTH; |
||
| 2 | mjames | 599 | |
| 4 | mjames | 600 | // adjust h & y (there's got to be a faster way for me to do this, but this should still help a fair bit for now) |
| 601 | h -= 8; |
||
| 602 | } while (h >= 8); |
||
| 603 | } |
||
| 2 | mjames | 604 | |
| 4 | mjames | 605 | // now do the final partial byte, if necessary |
| 606 | if (h) { |
||
| 607 | mod = h & 7; |
||
| 608 | // this time we want to mask the low bits of the byte, vs the high bits we did above |
||
| 609 | // register uint8_t mask = (1 << mod) - 1; |
||
| 610 | // note - lookup table results in a nearly 10% performance improvement in fill* functions |
||
| 611 | static uint8_t postmask[8] = { 0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, |
||
| 612 | 0x7F }; |
||
| 613 | register uint8_t mask = postmask[mod]; |
||
| 614 | if (color == WHITE) { |
||
| 615 | *pBuf |= mask; |
||
| 616 | } else { |
||
| 617 | *pBuf &= ~mask; |
||
| 618 | } |
||
| 619 | } |
||
| 2 | mjames | 620 | } |
| 621 | |||
| 622 | /* using Bresenham draw algorithm */ |
||
| 4 | mjames | 623 | void drawLine(int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint8_t color) { |
| 624 | int16_t x, y, dx, //deltas |
||
| 625 | dy, dx2, //scaled deltas |
||
| 626 | dy2, ix, //increase rate on the x axis |
||
| 627 | iy, //increase rate on the y axis |
||
| 628 | err; //the error term |
||
| 629 | uint16_t i; //looping variable |
||
| 2 | mjames | 630 | |
| 631 | // identify the first pixel |
||
| 4 | mjames | 632 | x = x1; |
| 633 | y = y1; |
||
| 2 | mjames | 634 | |
| 635 | // difference between starting and ending points |
||
| 636 | dx = x2 - x1; |
||
| 637 | dy = y2 - y1; |
||
| 638 | |||
| 639 | // calculate direction of the vector and store in ix and iy |
||
| 640 | if (dx >= 0) |
||
| 641 | ix = 1; |
||
| 642 | |||
| 4 | mjames | 643 | if (dx < 0) { |
| 2 | mjames | 644 | ix = -1; |
| 645 | dx = abs(dx); |
||
| 646 | } |
||
| 647 | |||
| 648 | if (dy >= 0) |
||
| 649 | iy = 1; |
||
| 650 | |||
| 4 | mjames | 651 | if (dy < 0) { |
| 2 | mjames | 652 | iy = -1; |
| 653 | dy = abs(dy); |
||
| 654 | } |
||
| 655 | |||
| 656 | // scale deltas and store in dx2 and dy2 |
||
| 657 | dx2 = dx * 2; |
||
| 658 | dy2 = dy * 2; |
||
| 659 | |||
| 660 | // all variables are set and it's time to enter the main loop. |
||
| 661 | |||
| 662 | if (dx > dy) // dx is the major axis |
||
| 4 | mjames | 663 | { |
| 2 | mjames | 664 | // initialize the error term |
| 665 | err = dy2 - dx; |
||
| 666 | |||
| 4 | mjames | 667 | for (i = 0; i <= dx; i++) { |
| 2 | mjames | 668 | drawPixel(x, y, color); |
| 4 | mjames | 669 | if (err >= 0) { |
| 2 | mjames | 670 | err -= dx2; |
| 671 | y += iy; |
||
| 672 | } |
||
| 673 | err += dy2; |
||
| 674 | x += ix; |
||
| 675 | } |
||
| 676 | } |
||
| 677 | |||
| 678 | else // dy is the major axis |
||
| 679 | { |
||
| 680 | // initialize the error term |
||
| 681 | err = dx2 - dy; |
||
| 682 | |||
| 4 | mjames | 683 | for (i = 0; i <= dy; i++) { |
| 2 | mjames | 684 | drawPixel(x, y, color); |
| 4 | mjames | 685 | if (err >= 0) { |
| 2 | mjames | 686 | err -= dy2; |
| 687 | x += ix; |
||
| 688 | } |
||
| 689 | err += dx2; |
||
| 690 | y += iy; |
||
| 691 | } |
||
| 692 | } |
||
| 693 | } |
||
| 694 | |||
| 4 | mjames | 695 | void select_display(int i) { |
| 696 | if (i < MAX_PHYS_DISPLAYS) { |
||
| 2 | mjames | 697 | cd = i; |
| 698 | } |
||
| 699 | } |