/** * Copyright (c) 2017-2018 Tara Keeling * 2020 Philippe G. * * This software is released under the MIT License. * https://opensource.org/licenses/MIT */ #include #include #include #include #include #include #include "gds.h" #include "gds_private.h" #define SHADOW_BUFFER static char TAG[] = "SSD1306"; // Functions are not deckared to minimize # of lines static void SetColumnAddress( struct GDS_Device* Device, uint8_t Start, uint8_t End ) { Device->WriteCommand( Device, 0x21 ); Device->WriteCommand( Device, Start ); Device->WriteCommand( Device, End ); } static void SetPageAddress( struct GDS_Device* Device, uint8_t Start, uint8_t End ) { Device->WriteCommand( Device, 0x22 ); Device->WriteCommand( Device, Start ); Device->WriteCommand( Device, End ); } static void Update( struct GDS_Device* Device ) { #ifdef SHADOW_BUFFER // not sure the compiler does not have to redo all calculation in for loops, so local it is int width = Device->Width, rows = Device->Height / 8; uint8_t *optr = Device->Shadowbuffer, *iptr = Device->Framebuffer; // by row, find first and last columns that have been updated for (int r = 0; r < rows; r++) { uint8_t first = 0, last; for (int c = 0; c < width; c++) { if (*iptr != *optr) { if (!first) first = c + 1; last = c ; } *optr++ = *iptr++; } // now update the display by "byte rows" if (first--) { SetColumnAddress( Device, first, last ); SetPageAddress( Device, r, r); Device->WriteData( Device, Device->Shadowbuffer + r*width + first, last - first + 1); } } #else // automatic counter and end Page/Column SetColumnAddress( Device, 0, Device->Width - 1); SetPageAddress( Device, 0, Device->Height / 8 - 1); Device->WriteData( Device, Device->Framebuffer, Device->FramebufferSize ); #endif } static void SetHFlip( struct GDS_Device* Device, bool On ) { Device->WriteCommand( Device, On ? 0xA1 : 0xA0 ); } static void SetVFlip( struct GDS_Device *Device, bool On ) { Device->WriteCommand( Device, On ? 0xC8 : 0xC0 ); } static void DisplayOn( struct GDS_Device* Device ) { Device->WriteCommand( Device, 0xAF ); } static void DisplayOff( struct GDS_Device* Device ) { Device->WriteCommand( Device, 0xAE ); } static void SetContrast( struct GDS_Device* Device, uint8_t Contrast ) { Device->WriteCommand( Device, 0x81 ); Device->WriteCommand( Device, Contrast ); } static bool Init( struct GDS_Device* Device ) { Device->FramebufferSize = ( Device->Width * Device->Height ) / 8; Device->Framebuffer = calloc( 1, Device->FramebufferSize ); NullCheck( Device->Framebuffer, return false ); #ifdef SHADOW_BUFFER if (Device->IF == IF_I2C) Device->Shadowbuffer = malloc( Device->FramebufferSize ); else Device->Shadowbuffer = heap_caps_malloc( Device->FramebufferSize, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA ); NullCheck( Device->Shadowbuffer, return false ); memset(Device->Shadowbuffer, 0xFF, Device->FramebufferSize); #endif // need to be off and disable display RAM Device->DisplayOff( Device ); Device->WriteCommand( Device, 0xA5 ); // charge pump regulator, do direct init Device->WriteCommand( Device, 0x8D ); Device->WriteCommand( Device, 0x14 ); // COM pins HW config (alternative:EN if 64, DIS if 32, remap:DIS) - some display might need something difference Device->WriteCommand( Device, 0xDA ); Device->WriteCommand( Device, ((Device->Height == 64 ? 1 : 0) << 4) | (0 < 5) ); // MUX Ratio Device->WriteCommand( Device, 0xA8 ); Device->WriteCommand( Device, Device->Height - 1); // Display Offset Device->WriteCommand( Device, 0xD3 ); Device->WriteCommand( Device, 0 ); // Display Start Line Device->WriteCommand( Device, 0x40 + 0x00 ); Device->SetContrast( Device, 0x7F ); // set flip modes Device->SetVFlip( Device, false ); Device->SetHFlip( Device, false ); // no Display Inversion Device->WriteCommand( Device, 0xA6 ); // set Clocks Device->WriteCommand( Device, 0xD5 ); Device->WriteCommand( Device, ( 0x08 << 4 ) | 0x00 ); // set Adressing Mode Horizontal Device->WriteCommand( Device, 0x20 ); Device->WriteCommand( Device, 0 ); // gone with the wind Device->WriteCommand( Device, 0xA4 ); Device->DisplayOn( Device ); Device->Update( Device ); return true; } static const struct GDS_Device SSD1306 = { .DisplayOn = DisplayOn, .DisplayOff = DisplayOff, .SetContrast = SetContrast, .SetVFlip = SetVFlip, .SetHFlip = SetHFlip, .DrawPixelFast = GDS_DrawPixelFast, .Update = Update, .Init = Init, }; struct GDS_Device* SSD1306_Detect(char *Driver, struct GDS_Device* Device) { if (!strcasestr(Driver, "SSD1306")) return NULL; if (!Device) Device = calloc(1, sizeof(struct GDS_Device)); *Device = SSD1306; ESP_LOGI(TAG, "SSD1306 driver"); return Device; }