mirror of
https://github.com/sle118/squeezelite-esp32.git
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294 lines
10 KiB
C
294 lines
10 KiB
C
/**
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* Copyright (c) 2017-2018 Tara Keeling
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* 2020 Philippe G.
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*
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* This software is released under the MIT License.
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* https://opensource.org/licenses/MIT
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <esp_heap_caps.h>
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#include <esp_log.h>
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#include "gds.h"
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#include "gds_private.h"
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#define SHADOW_BUFFER
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#define USE_IRAM
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#define PAGE_BLOCK 2048
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#define ENABLE_WRITE 0x5c
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#define min(a, b) (((a) < (b)) ? (a) : (b))
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static char TAG[] = "SSD1351";
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struct PrivateSpace {
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uint8_t *iRAM, *Shadowbuffer;
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uint8_t ReMap, PageSize;
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};
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// Functions are not declared to minimize # of lines
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static void WriteByte(struct GDS_Device* Device, uint8_t Data) { Device->WriteData(Device, &Data, 1); }
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static void SetColumnAddress(struct GDS_Device* Device, uint8_t Start, uint8_t End) {
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Device->WriteCommand(Device, 0x15);
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WriteByte(Device, Start);
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WriteByte(Device, End);
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}
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static void SetRowAddress(struct GDS_Device* Device, uint8_t Start, uint8_t End) {
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Device->WriteCommand(Device, 0x75);
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WriteByte(Device, Start);
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WriteByte(Device, End);
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}
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static void Update16(struct GDS_Device* Device) {
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struct PrivateSpace* Private = (struct PrivateSpace*)Device->Private;
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#ifdef SHADOW_BUFFER
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uint32_t *optr = (uint32_t*)Private->Shadowbuffer, *iptr = (uint32_t*)Device->Framebuffer;
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int FirstCol = Device->Width / 2, LastCol = 0, FirstRow = -1, LastRow = 0;
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for(int r = 0; r < Device->Height; r++) {
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// look for change and update shadow (cheap optimization = width is always a multiple of 2)
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for(int c = 0; c < Device->Width / 2; c++, iptr++, optr++) {
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if(*optr != *iptr) {
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*optr = *iptr;
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if(c < FirstCol) FirstCol = c;
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if(c > LastCol) LastCol = c;
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if(FirstRow < 0) FirstRow = r;
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LastRow = r;
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}
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}
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// wait for a large enough window - careful that window size might increase by more than a line at once !
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if(FirstRow < 0 || ((LastCol - FirstCol + 1) * (r - FirstRow + 1) * 4 < PAGE_BLOCK && r != Device->Height - 1)) continue;
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FirstCol *= 2;
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LastCol = LastCol * 2 + 1;
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SetRowAddress(Device, FirstRow, LastRow);
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SetColumnAddress(Device, FirstCol, LastCol);
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Device->WriteCommand(Device, ENABLE_WRITE);
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int ChunkSize = (LastCol - FirstCol + 1) * 2;
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// own use of IRAM has not proven to be much better than letting SPI do its copy
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if(Private->iRAM) {
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uint8_t* optr = Private->iRAM;
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for(int i = FirstRow; i <= LastRow; i++) {
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memcpy(optr, Private->Shadowbuffer + (i * Device->Width + FirstCol) * 2, ChunkSize);
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optr += ChunkSize;
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if(optr - Private->iRAM < PAGE_BLOCK && i < LastRow) continue;
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Device->WriteData(Device, Private->iRAM, optr - Private->iRAM);
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optr = Private->iRAM;
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}
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} else
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for(int i = FirstRow; i <= LastRow; i++) {
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Device->WriteData(Device, Private->Shadowbuffer + (i * Device->Width + FirstCol) * 2, ChunkSize);
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}
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FirstCol = Device->Width / 2;
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LastCol = 0;
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FirstRow = -1;
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}
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#else
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// always update by full lines
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SetColumnAddress(Device, 0, Device->Width - 1);
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for(int r = 0; r < Device->Height; r += min(Private->PageSize, Device->Height - r)) {
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int Height = min(Private->PageSize, Device->Height - r);
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SetRowAddress(Device, r, r + Height - 1);
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Device->WriteCommand(Device, ENABLE_WRITE);
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if(Private->iRAM) {
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memcpy(Private->iRAM, Device->Framebuffer + r * Device->Width * 2, Height * Device->Width * 2);
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Device->WriteData(Device, Private->iRAM, Height * Device->Width * 2);
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} else {
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Device->WriteData(Device, Device->Framebuffer + r * Device->Width * 2, Height * Device->Width * 2);
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}
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}
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#endif
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}
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static void Update24(struct GDS_Device* Device) {
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struct PrivateSpace* Private = (struct PrivateSpace*)Device->Private;
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int FirstCol = (Device->Width * 3) / 2, LastCol = 0, FirstRow = -1, LastRow = 0;
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#ifdef SHADOW_BUFFER
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uint16_t *optr = (uint16_t*)Private->Shadowbuffer, *iptr = (uint16_t*)Device->Framebuffer;
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for(int r = 0; r < Device->Height; r++) {
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// look for change and update shadow (cheap optimization = width always / by 2)
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for(int c = 0; c < (Device->Width * 3) / 2; c++, optr++, iptr++) {
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if(*optr != *iptr) {
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*optr = *iptr;
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if(c < FirstCol) FirstCol = c;
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if(c > LastCol) LastCol = c;
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if(FirstRow < 0) FirstRow = r;
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LastRow = r;
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}
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}
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// do we have enough to send (cols are divided by 3/2)
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if(FirstRow < 0 || ((((LastCol - FirstCol + 1) * 2 + 3 - 1) / 3) * (r - FirstRow + 1) * 3 < PAGE_BLOCK && r != Device->Height - 1)) continue;
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FirstCol = (FirstCol * 2) / 3;
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LastCol = (LastCol * 2 + 1) / 3;
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SetRowAddress(Device, FirstRow, LastRow);
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SetColumnAddress(Device, FirstCol, LastCol);
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Device->WriteCommand(Device, ENABLE_WRITE);
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int ChunkSize = (LastCol - FirstCol + 1) * 3;
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// own use of IRAM has not proven to be much better than letting SPI do its copy
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if(Private->iRAM) {
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uint8_t* optr = Private->iRAM;
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for(int i = FirstRow; i <= LastRow; i++) {
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memcpy(optr, Private->Shadowbuffer + (i * Device->Width + FirstCol) * 3, ChunkSize);
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optr += ChunkSize;
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if(optr - Private->iRAM < PAGE_BLOCK && i < LastRow) continue;
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Device->WriteData(Device, Private->iRAM, optr - Private->iRAM);
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optr = Private->iRAM;
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}
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} else
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for(int i = FirstRow; i <= LastRow; i++) {
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Device->WriteData(Device, Private->Shadowbuffer + (i * Device->Width + FirstCol) * 3, ChunkSize);
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}
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FirstCol = (Device->Width * 3) / 2;
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LastCol = 0;
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FirstRow = -1;
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}
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#else
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// always update by full lines
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SetColumnAddress(Device, 0, Device->Width - 1);
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for(int r = 0; r < Device->Height; r += min(Private->PageSize, Device->Height - r)) {
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int Height = min(Private->PageSize, Device->Height - r);
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SetRowAddress(Device, r, r + Height - 1);
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Device->WriteCommand(Device, ENABLE_WRITE);
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if(Private->iRAM) {
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memcpy(Private->iRAM, Device->Framebuffer + r * Device->Width * 3, Height * Device->Width * 3);
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Device->WriteData(Device, Private->iRAM, Height * Device->Width * 3);
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} else {
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Device->WriteData(Device, Device->Framebuffer + r * Device->Width * 3, Height * Device->Width * 3);
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}
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}
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#endif
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}
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static void SetLayout(struct GDS_Device* Device, struct GDS_Layout* Layout) {
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struct PrivateSpace* Private = (struct PrivateSpace*)Device->Private;
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Private->ReMap = Layout->HFlip ? (Private->ReMap & ~(1 << 1)) : (Private->ReMap | (1 << 1));
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Private->ReMap = Layout->VFlip ? (Private->ReMap | (1 << 4)) : (Private->ReMap & ~(1 << 4));
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Device->WriteCommand(Device, 0xA0);
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WriteByte(Device, Private->ReMap);
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Device->WriteCommand(Device, Layout->Invert ? 0xA7 : 0xA6);
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}
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static void DisplayOn(struct GDS_Device* Device) { Device->WriteCommand(Device, 0xAF); }
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static void DisplayOff(struct GDS_Device* Device) { Device->WriteCommand(Device, 0xAE); }
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static void SetContrast(struct GDS_Device* Device, uint8_t Contrast) {
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Device->WriteCommand(Device, 0xC7);
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WriteByte(Device, Contrast >> 4);
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}
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static bool Init(struct GDS_Device* Device) {
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struct PrivateSpace* Private = (struct PrivateSpace*)Device->Private;
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int Depth = (Device->Depth + 8 - 1) / 8;
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Private->PageSize = min(8, PAGE_BLOCK / (Device->Width * Depth));
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#ifdef SHADOW_BUFFER
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Private->Shadowbuffer = malloc(Device->FramebufferSize);
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memset(Private->Shadowbuffer, 0xFF, Device->FramebufferSize);
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#endif
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#ifdef USE_IRAM
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Private->iRAM = heap_caps_malloc((Private->PageSize + 1) * Device->Width * Depth, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA);
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#endif
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ESP_LOGI(TAG, "SSD1351 with bit depth %u, page %u, iRAM %p", Device->Depth, Private->PageSize, Private->iRAM);
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// unlock (specially 0xA2)
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Device->WriteCommand(Device, 0xFD);
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WriteByte(Device, 0xB1);
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// set clocks
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/*
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Device->WriteCommand( Device, 0xB3 );
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WriteByte( Device, ( 0x08 << 4 ) | 0x00 );
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*/
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// need to be off and disable display RAM
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Device->DisplayOff(Device);
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// need COM split (5)
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Private->ReMap = (1 << 5);
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// Display Offset
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Device->WriteCommand(Device, 0xA2);
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WriteByte(Device, 0x00);
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// Display Start Line
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Device->WriteCommand(Device, 0xA1);
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WriteByte(Device, 0x00);
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// set flip modes & contrast
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Device->SetContrast(Device, 0x7F);
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struct GDS_Layout Layout = {};
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Device->SetLayout(Device, &Layout);
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// set Adressing Mode Horizontal
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Private->ReMap |= (0 << 2);
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// set screen depth (16/18)
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if(Device->Depth == 24) Private->ReMap |= (0x02 << 6);
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// write ReMap byte
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Device->WriteCommand(Device, 0xA0);
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WriteByte(Device, Private->ReMap);
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// no Display Inversion
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Device->WriteCommand(Device, 0xA6);
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// gone with the wind
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Device->DisplayOn(Device);
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Device->Update(Device);
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return true;
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}
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static const struct GDS_Device SSD1351 = {
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.DisplayOn = DisplayOn,
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.DisplayOff = DisplayOff,
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.SetContrast = SetContrast,
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.SetLayout = SetLayout,
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.Update = Update16,
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.Init = Init,
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.Mode = GDS_RGB565,
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.Depth = 16,
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};
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struct GDS_Device* SSD1351_Detect(sys_display_config* Driver, struct GDS_Device* Device) {
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int Depth;
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if(Driver->common.driver != sys_display_drivers_SSD1351) return NULL;
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if(!Device) Device = calloc(1, sizeof(struct GDS_Device));
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*Device = SSD1351;
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Depth = Driver->common.bitDepth != 0 ? Driver->common.bitDepth : 18;
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if(Depth == 18) {
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Device->Mode = GDS_RGB666;
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Device->Depth = 24;
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Device->Update = Update24;
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}
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return Device;
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} |