/**
* Copyright (c) 2017-2018 Tara Keeling
* 2020 Philippe G.
*
* This software is released under the MIT License.
* https://opensource.org/licenses/MIT
*/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include <esp_log.h>
#include "gds.h"
#include "gds_private.h"
static char TAG[] = "SSD1675";
const unsigned char EPD_lut_full_update[] = {
0x80,0x60,0x40,0x00,0x00,0x00,0x00, //LUT0: BB: VS 0 ~7
0x10,0x60,0x20,0x00,0x00,0x00,0x00, //LUT1: BW: VS 0 ~7
0x80,0x60,0x40,0x00,0x00,0x00,0x00, //LUT2: WB: VS 0 ~7
0x10,0x60,0x20,0x00,0x00,0x00,0x00, //LUT3: WW: VS 0 ~7
0x00,0x00,0x00,0x00,0x00,0x00,0x00, //LUT4: VCOM: VS 0 ~7
0x03,0x03,0x00,0x00,0x02, // TP0 A~D RP0
0x09,0x09,0x00,0x00,0x02, // TP1 A~D RP1
0x03,0x03,0x00,0x00,0x02, // TP2 A~D RP2
0x00,0x00,0x00,0x00,0x00, // TP3 A~D RP3
0x00,0x00,0x00,0x00,0x00, // TP4 A~D RP4
0x00,0x00,0x00,0x00,0x00, // TP5 A~D RP5
0x00,0x00,0x00,0x00,0x00, // TP6 A~D RP6
0x15,0x41,0xA8,0x32,0x30,0x0A,
};
const unsigned char EPD_lut_partial_update[]= { //20 bytes
0x00,0x00,0x00,0x00,0x00,0x00,0x00, //LUT0: BB: VS 0 ~7
0x80,0x00,0x00,0x00,0x00,0x00,0x00, //LUT1: BW: VS 0 ~7
0x40,0x00,0x00,0x00,0x00,0x00,0x00, //LUT2: WB: VS 0 ~7
0x00,0x00,0x00,0x00,0x00,0x00,0x00, //LUT3: WW: VS 0 ~7
0x00,0x00,0x00,0x00,0x00,0x00,0x00, //LUT4: VCOM: VS 0 ~7
0x0A,0x00,0x00,0x00,0x00, // TP0 A~D RP0
0x00,0x00,0x00,0x00,0x00, // TP1 A~D RP1
0x00,0x00,0x00,0x00,0x00, // TP2 A~D RP2
0x00,0x00,0x00,0x00,0x00, // TP3 A~D RP3
0x00,0x00,0x00,0x00,0x00, // TP4 A~D RP4
0x00,0x00,0x00,0x00,0x00, // TP5 A~D RP5
0x00,0x00,0x00,0x00,0x00, // TP6 A~D RP6
0x15,0x41,0xA8,0x32,0x30,0x0A,
};
struct PrivateSpace {
int ReadyPin;
uint16_t Height;
};
// Functions are not declared to minimize # of lines
void WaitReady( struct GDS_Device* Device) {
struct PrivateSpace *Private = (struct PrivateSpace*) Device->Private;
if (Private->ReadyPin >= 0) {
int count = 4*1000;
while (gpio_get_level( Private->ReadyPin ) && count) {
vTaskDelay( pdMS_TO_TICKS(100) );
count -= 100;
}
} else {
vTaskDelay( pdMS_TO_TICKS(2000) );
}
}
static void WriteByte( struct GDS_Device* Device, uint8_t Data ) {
Device->WriteData( Device, &Data, 1 );
}
static void SetColumnAddress( struct GDS_Device* Device, uint8_t Start, uint8_t End ) {
// start might be greater than end if we decrement
Device->WriteCommand( Device, 0x44 );
Device->WriteData( Device, &Start, 1 );
Device->WriteData( Device, &End, 1 );
// we obviously want to start ... from the start
Device->WriteCommand( Device, 0x4e );
WriteByte( Device, Start );
}
static void SetRowAddress( struct GDS_Device* Device, uint16_t Start, uint16_t End ) {
// start might be greater than end if we decrement
Device->WriteCommand( Device, 0x45 );
WriteByte( Device, Start );
WriteByte( Device, Start >> 8 );
WriteByte( Device, End );
WriteByte( Device, End >> 8 );
// we obviously want to start ... from the start
Device->WriteCommand( Device, 0x4f );
WriteByte( Device, Start );
WriteByte( Device, Start >> 8 );
}
static void Update( struct GDS_Device* Device ) {
uint8_t *iptr = Device->Framebuffer;
Device->WriteCommand( Device, 0x24 );
// this is awfully slow, but e-ink are slow anyway ...
for (int i = Device->FramebufferSize; --i >= 0;) {
WriteByte( Device, ~*iptr++ );
}
Device->WriteCommand( Device, 0x22 );
WriteByte( Device, 0xC7);
Device->WriteCommand( Device, 0X20 );
WaitReady( Device );
}
// remember that for these ELD drivers W and H are "inverted"
static void IRAM_ATTR DrawPixelFast( struct GDS_Device* Device, int X, int Y, int Color ) {
uint32_t YBit = ( Y & 0x07 );
Y>>= 3;
uint8_t* FBOffset = Device->Framebuffer + ( ( Y * Device->Width ) + X );
*FBOffset = ( Color == GDS_COLOR_BLACK ) ? *FBOffset & ~BIT( 7-YBit ) : *FBOffset | BIT( 7-YBit );
}
static void ClearWindow( struct GDS_Device* Device, int x1, int y1, int x2, int y2, int Color ) {
for (int r = y1; r <= y2; r++) {
for (int c = x1; c <= x2; c++) {
DrawPixelFast( Device, c, r, Color );
}
}
}
static void DrawBitmapCBR(struct GDS_Device* Device, uint8_t *Data, int Width, int Height, int Color ) {
if (!Height) Height = Device->Height;
if (!Width) Width = Device->Width;
// just do row/column swap
for (int r = 0; r < Height; r++) {
uint8_t *optr = Device->Framebuffer + r*Device->Width, *iptr = Data + r;
for (int c = Width; --c >= 0;) {
*optr++ = *iptr;
iptr += Height;
}
}
}
static bool Init( struct GDS_Device* Device ) {
struct PrivateSpace *Private = (struct PrivateSpace*) Device->Private;
// need to re-adjust framebuffer because these are non % 8
Private->Height = Device->Height;
if (Device->Height & 0x07) Device->Height = ((Device->Height >> 3) + 1) << 3;
Device->FramebufferSize = Device->Width * Device->Height / 8;
Device->Framebuffer = calloc(1, Device->FramebufferSize);
NullCheck( Device->Framebuffer, return false );
if (Private->ReadyPin >= 0) {
gpio_pad_select_gpio( Private->ReadyPin );
gpio_set_pull_mode( Private->ReadyPin, GPIO_PULLUP_ONLY);
gpio_set_direction( Private->ReadyPin, GPIO_MODE_INPUT );
}
// soft reset
vTaskDelay(pdMS_TO_TICKS( 2000 ));
Device->WriteCommand( Device, 0x12 );
WaitReady( Device );
Device->WriteCommand( Device, 0x74 );
WriteByte( Device, 0x54 );
Device->WriteCommand( Device, 0x7e );
WriteByte( Device, 0x3B );
Device->WriteCommand( Device, 0x3c );
WriteByte( Device, 0x03 );
Device->WriteCommand( Device, 0x2c );
WriteByte( Device, 0x55 );
Device->WriteCommand( Device, 0x03 );
WriteByte( Device, EPD_lut_full_update[70] );
Device->WriteCommand( Device, 0x04 );
WriteByte( Device, EPD_lut_full_update[71] );
WriteByte( Device, EPD_lut_full_update[72] );
WriteByte( Device, EPD_lut_full_update[73] );
Device->WriteCommand( Device, 0x3a );
WriteByte( Device, EPD_lut_full_update[74] );
Device->WriteCommand( Device, 0x3b );
WriteByte( Device, EPD_lut_full_update[75] );
Device->WriteCommand( Device, 0X32 );
for (int i = 0; i < 70; i++) {
WriteByte( Device, EPD_lut_full_update[i] );
}
// now deal with funny X/Y layout (W and H are "inverted")
Device->WriteCommand( Device, 0x01 );
WriteByte( Device, Device->Width - 1 );
WriteByte( Device, (Device->Width - 1) >> 8 );
WriteByte( Device, (0 << 0) );
/*
Start from 0, Ymax, incX, decY. Starting from X=Height would be difficult
as we would hit the extra bits added because height % 8 != 0 and they are
not written by the DrawPixel. By starting from X=0 we are aligned and
doing incY is like a clockwise 90° rotation (vs otherwise we would virtually
do a counter-clockwise rotation but again have the "border" issue.
*/
Device->WriteCommand( Device, 0x11 );
WriteByte( Device, (1 << 2) | (0 << 1) | (1 << 0));
// must be in order with increment/decrement i.e start might be > end if we decrement
SetColumnAddress( Device, 0x0, (Device->Height >> 3) - 1 );
SetRowAddress ( Device, Device->Width - 1, 0 );
WaitReady( Device );
Update( Device );
return true;
}
static const struct GDS_Device SSD1675 = {
.DrawBitmapCBR = DrawBitmapCBR, .ClearWindow = ClearWindow,
.DrawPixelFast = DrawPixelFast,
.Update = Update, .Init = Init,
};
struct GDS_Device* SSD1675_Detect(char *Driver, struct GDS_Device* Device) {
if (!strcasestr(Driver, "SSD1675")) return NULL;
if (!Device) Device = calloc(1, sizeof(struct GDS_Device));
*Device = SSD1675;
Device->Depth = 1;
Device->Alloc = GDS_ALLOC_NONE;
char *p;
struct PrivateSpace* Private = (struct PrivateSpace*) Device->Private;
Private->ReadyPin = -1;
if ((p = strcasestr(Driver, "ready")) != NULL) Private->ReadyPin = atoi(strchr(p, '=') + 1);
ESP_LOGI(TAG, "SSD1675 driver with ready GPIO %d", Private->ReadyPin);
return Device;
}