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| // should really use various NOPs here instead of while loop | |
| #define SPOUT(x) SPDR = x; \ | |
| while (!(SPSR & _BV(SPIF))) { } | |
| // should really use various NOPs here instead of while loop | |
| #define SPOUT2(x) SPDR = x; \ | |
| while (!(SPSR & _BV(SPIF))) { } | |
| // should really use various NOPs here instead of while loop | |
| #define SPOUT3(x) SPDR = x; \ | |
| while (!(SPSR & _BV(SPIF))) { } | |
| // For reference, this is the "closed loop" C++ version of paintScreen() | |
| // used prior to the above version. | |
| void Arduboy2Core::paintScreen(uint8_t image[], bool clear) | |
| { | |
| if (clear) | |
| { | |
| blank(); | |
| return; | |
| } | |
| uint8_t *buffr; | |
| uint8_t x, y, data; | |
| sendLCDCommand(0x2B); // Row Address Setting (height) | |
| sendLCDData(0x00); // COM0 -> COM160 | |
| sendLCDData(0x00); // | |
| sendLCDData(0x00); // | |
| sendLCDData(HEIGHT-1); //HEIGHT-1 | |
| for (x=0; x<WIDTH; x++) { | |
| // start at x column of page 0 | |
| buffr = &image + x; | |
| sendLCDCommand(0x2A); // Column Address Setting | |
| sendLCDData(0x00); | |
| sendLCDData(x); | |
| sendLCDData(0x00); | |
| sendLCDData(x); | |
| sendLCDCommand(0x2C); // write memory | |
| // iteratate over 8 vertical pages of SSD1306 hardware vertially | |
| for (y=8; y>0; y--) { | |
| data = *buffr; | |
| // 3 pixels horizontally, 2 pixels vertically | |
| // PURPOSSELY unrolling this loop | |
| if (data & 0b00000001) { SPOUT(0xFF); SPOUT2(0xFF); // #1 | |
| } else { SPOUT(0); SPOUT2(0); } | |
| if (data & 0b00000010) { SPOUT(0xFF); SPOUT2(0xFF); // #2 | |
| } else { SPOUT(0); SPOUT2(0); } | |
| if (data & 0b00000100) { SPOUT(0xFF); SPOUT2(0xFF); // #3 | |
| } else { SPOUT(0); SPOUT2(0); } | |
| if (data & 0b00001000) { SPOUT(0xFF); SPOUT2(0xFF); // #4 | |
| } else { SPOUT(0); SPOUT2(0); } | |
| if (data & 0b00010000) { SPOUT(0xFF); SPOUT2(0xFF); // #5 | |
| } else { SPOUT(0); SPOUT2(0); } | |
| if (data & 0b00100000) { SPOUT(0xFF); SPOUT2(0xFF); // #6 | |
| } else { SPOUT(0); SPOUT2(0); } | |
| if (data & 0b01000000) { SPOUT(0xFF); SPOUT2(0xFF); // #7 | |
| } else { SPOUT(0); SPOUT2(0); } | |
| if (data & 0b10000000) { SPOUT(0xFF); SPOUT3(0xFF); // #8 | |
| } else { SPOUT(0); SPOUT3(0); } | |
| buffr += 128; // skip to next page | |
| } | |
| } | |
| } |
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