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@@ -0,0 +1,182 @@
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+/**
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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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+
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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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+
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+#include "gds.h"
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+#include "gds_private.h"
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+
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+#define SHADOW_BUFFER
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+#define PAGE_BLOCK 1024
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+
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+#define min(a,b) (((a) < (b)) ? (a) : (b))
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+
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+static char TAG[] = "SH1122";
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+
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+struct PrivateSpace {
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+ uint8_t *iRAM, *Shadowbuffer;
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+ uint8_t PageSize;
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+};
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+
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+// Functions are not declared to minimize # of lines
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+
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+static void SetColumnAddress( struct GDS_Device* Device, uint8_t Start, uint8_t End ) {
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+ Device->WriteCommand( Device, 0x10 | (Start >> 4) );
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+ Device->WriteCommand( Device, 0x00 | (Start & 0x0f) );
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+}
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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, 0xB0 );
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+ Device->WriteCommand( Device, Start );
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+}
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+
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+static void Update( struct GDS_Device* Device ) {
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+ struct PrivateSpace *Private = (struct PrivateSpace*) Device->Private;
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+
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+ // RAM is by columns of 4 pixels ...
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+ SetColumnAddress( Device, 0, Device->Width / 4 - 1);
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+
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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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+ bool dirty = false;
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+
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+ for (int r = 0, page = 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 = Device->Width / 2 / 2; --c >= 0;) {
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+ if (*optr != *iptr) {
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+ dirty = true;
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+ *optr = *iptr;
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+ }
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+ iptr++; optr++;
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+ }
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+
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+ // one line done, check for page boundary
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+ if (++page == Private->PageSize) {
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+ if (dirty) {
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+ SetRowAddress( Device, r - page + 1, r );
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+ if (Private->iRAM) {
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+ memcpy(Private->iRAM, Private->Shadowbuffer + (r - page + 1) * Device->Width / 2, page * Device->Width / 2 );
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+ Device->WriteData( Device, Private->iRAM, Device->Width * page / 2 );
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+ } else {
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+ Device->WriteData( Device, Private->Shadowbuffer + (r - page + 1) * Device->Width / 2, page * Device->Width / 2);
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+ }
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+ dirty = false;
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+ }
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+ page = 0;
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+ }
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+ }
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+#else
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+ SetRowAddress( Device, 0, Device->Height - 1 );
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+ for (int r = 0; r < Device->Height; r += Private->PageSize) {
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+ if (Private->iRAM) {
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+ memcpy(Private->iRAM, Device->Framebuffer + r * Device->Width / 2, Private->PageSize * Device->Width / 2 );
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+ Device->WriteData( Device, Private->iRAM, Private->PageSize * Device->Width / 2 );
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+ } else {
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+ Device->WriteData( Device, Device->Framebuffer + r * Device->Width / 2, Private->PageSize * Device->Width / 2 );
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+ }
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+ }
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+#endif
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+}
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+
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+static void DrawPixelFast4( struct GDS_Device* Device, int X, int Y, int Color ) {
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+ uint8_t* FBOffset = Device->Framebuffer + ( (Y * Device->Width >> 1) + (X >> 1));
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+ *FBOffset = X & 0x01 ? ((*FBOffset & 0xf0) | (Color & 0x0f)) : (*FBOffset & 0x0f) | ((Color & 0x0f) << 4);
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+}
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+
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+static void SetLayout( struct GDS_Device* Device, struct GDS_Layout *Layout ) {
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+ if (Layout->HFlip) {
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+ Device->WriteCommand( Device, 0x40 + 0x20 );
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+ Device->WriteCommand( Device, 0xA1 );
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+ } else {
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+ Device->WriteCommand( Device, 0x40 + 0x00 );
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+ Device->WriteCommand( Device, 0xA0 );
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+ }
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+ Device->WriteCommand( Device, Layout->VFlip ? 0xC8 : 0xC0 );
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+ Device->WriteCommand( Device, Layout->Invert ? 0xA7 : 0xA6 );
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+}
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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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+
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+static void SetContrast( struct GDS_Device* Device, uint8_t Contrast ) {
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+ Device->WriteCommand( Device, 0x81 );
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+ Device->WriteCommand( Device, Contrast );
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+}
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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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+
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+ // find a page size that is not too small is an integer of height
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+ Private->PageSize = min(8, PAGE_BLOCK / (Device->Width / 2));
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+ while (Private->PageSize && Device->Height != (Device->Height / Private->PageSize) * Private->PageSize) Private->PageSize--;
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+
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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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+
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+ // only use iRAM for SPI
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+ if (Device->IF == GDS_IF_SPI) {
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+ Private->iRAM = heap_caps_malloc( Private->PageSize * Device->Width / 2, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA );
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+ }
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+
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+ ESP_LOGI(TAG, "SH1122 page %u, iRAM %p", Private->PageSize, Private->iRAM);
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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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+ Device->WriteCommand( Device, 0xA5 );
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+
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+ // Display Offset
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+ Device->WriteCommand( Device, 0xD3 );
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+ Device->WriteCommand( Device, 0 );
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+
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+ // set flip modes
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+ struct GDS_Layout Layout = { };
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+ Device->SetLayout( Device, &Layout );
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+
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+ // set Clocks => check value
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+ Device->WriteCommand( Device, 0xD5 );
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+ Device->WriteCommand( Device, ( 0x04 << 4 ) | 0x00 );
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+
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+ // MUX Ratio => fixed
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+ Device->WriteCommand( Device, 0xA8 );
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+ Device->WriteCommand( Device, Device->Height - 1);
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+
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+ // no Display Inversion
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+ Device->WriteCommand( Device, 0xA6 );
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+
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+ // gone with the wind
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+ Device->WriteCommand( Device, 0xA4 );
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+ Device->DisplayOn( Device );
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+ Device->Update( Device );
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+
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+ return true;
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+}
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+
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+static const struct GDS_Device SH1122 = {
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+ .DisplayOn = DisplayOn, .DisplayOff = DisplayOff, .SetContrast = SetContrast,
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+ .DrawPixelFast = DrawPixelFast4,
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+ .SetLayout = SetLayout,
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+ .Update = Update, .Init = Init,
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+ .Mode = GDS_GRAYSCALE, .Depth = 4,
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+ .HighNibble = true,
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+};
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+
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+struct GDS_Device* SH1122_Detect(char *Driver, struct GDS_Device* Device) {
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+ if (!strcasestr(Driver, "SH1122")) return NULL;
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+
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+ if (!Device) Device = calloc(1, sizeof(struct GDS_Device));
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+ *Device = SH1122;
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+
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+ return Device;
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+}
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