btclock_v3/src/lib/epd.cpp

#include "epd.hpp"

#ifndef IS_BTCLOCK_S3
Native_Pin EPD_CS[NUM_SCREENS] = {
    Native_Pin(2),
    Native_Pin(4),
    Native_Pin(6),
    Native_Pin(10),
    Native_Pin(33),
    Native_Pin(21),
    Native_Pin(17),
#if NUM_SCREENS == 9
    // MCP23X17_Pin(mcp2, 7),
    Native_Pin(-1),
    Native_Pin(-1),
#endif
};
Native_Pin EPD_BUSY[NUM_SCREENS] = {
    Native_Pin(3),
    Native_Pin(5),
    Native_Pin(7),
    Native_Pin(9),
    Native_Pin(37),
    Native_Pin(18),
    Native_Pin(16),
};
MCP23X17_Pin EPD_RESET_MPD[NUM_SCREENS] = {
    MCP23X17_Pin(mcp1, 8),
    MCP23X17_Pin(mcp1, 9),
    MCP23X17_Pin(mcp1, 10),
    MCP23X17_Pin(mcp1, 11),
    MCP23X17_Pin(mcp1, 12),
    MCP23X17_Pin(mcp1, 13),
    MCP23X17_Pin(mcp1, 14),
};

Native_Pin EPD_DC = Native_Pin(14);
#else
Native_Pin EPD_DC = Native_Pin(38);

MCP23X17_Pin EPD_BUSY[NUM_SCREENS] = {
    MCP23X17_Pin(mcp1, 8),
    MCP23X17_Pin(mcp1, 9),
    MCP23X17_Pin(mcp1, 10),
    MCP23X17_Pin(mcp1, 11),
    MCP23X17_Pin(mcp1, 12),
    MCP23X17_Pin(mcp1, 13),
    MCP23X17_Pin(mcp1, 14),
    MCP23X17_Pin(mcp1, 4),
};

MCP23X17_Pin EPD_CS[NUM_SCREENS] = {
    MCP23X17_Pin(mcp2, 8),
    MCP23X17_Pin(mcp2, 10),
    MCP23X17_Pin(mcp2, 12),
    MCP23X17_Pin(mcp2, 14),
    MCP23X17_Pin(mcp2, 0),
    MCP23X17_Pin(mcp2, 2),
    MCP23X17_Pin(mcp2, 4),
    MCP23X17_Pin(mcp2, 6)
};

MCP23X17_Pin EPD_RESET_MPD[NUM_SCREENS] = {
    MCP23X17_Pin(mcp2, 9),
    MCP23X17_Pin(mcp2, 11),
    MCP23X17_Pin(mcp2, 13),
    MCP23X17_Pin(mcp2, 15),
    MCP23X17_Pin(mcp2, 1),
    MCP23X17_Pin(mcp2, 3),
    MCP23X17_Pin(mcp2, 5),
    MCP23X17_Pin(mcp2, 7),
};

#endif

GxEPD2_BW<GxEPD2_213_B74, GxEPD2_213_B74::HEIGHT> displays[NUM_SCREENS] = {
    GxEPD2_213_B74(&EPD_CS[0], &EPD_DC, &EPD_RESET_MPD[0], &EPD_BUSY[0]),
    GxEPD2_213_B74(&EPD_CS[1], &EPD_DC, &EPD_RESET_MPD[1], &EPD_BUSY[1]),
    GxEPD2_213_B74(&EPD_CS[2], &EPD_DC, &EPD_RESET_MPD[2], &EPD_BUSY[2]),
    GxEPD2_213_B74(&EPD_CS[3], &EPD_DC, &EPD_RESET_MPD[3], &EPD_BUSY[3]),
    GxEPD2_213_B74(&EPD_CS[4], &EPD_DC, &EPD_RESET_MPD[4], &EPD_BUSY[4]),
    GxEPD2_213_B74(&EPD_CS[5], &EPD_DC, &EPD_RESET_MPD[5], &EPD_BUSY[5]),
    GxEPD2_213_B74(&EPD_CS[6], &EPD_DC, &EPD_RESET_MPD[6], &EPD_BUSY[6]),
#ifdef IS_BTCLOCK_S3
    GxEPD2_213_B74(&EPD_CS[7], &EPD_DC, &EPD_RESET_MPD[6], &EPD_BUSY[7]),
#endif
};

std::array<String, NUM_SCREENS> currentEpdContent;
std::array<String, NUM_SCREENS> epdContent;
uint32_t lastFullRefresh[NUM_SCREENS];
TaskHandle_t tasks[NUM_SCREENS];
// TaskHandle_t epdTaskHandle = NULL;

#define UPDATE_QUEUE_SIZE 14
QueueHandle_t updateQueue;

// SemaphoreHandle_t epdUpdateSemaphore[NUM_SCREENS];

int fgColor = GxEPD_WHITE;
int bgColor = GxEPD_BLACK;

#define FONT_SMALL Antonio_SemiBold20pt7b
#define FONT_BIG Antonio_SemiBold90pt7b
#define FONT_MEDIUM Antonio_SemiBold40pt7b
std::mutex epdUpdateMutex;
std::mutex epdMutex[NUM_SCREENS];

uint8_t qrcode[800];

void forceFullRefresh()
{
    for (uint i = 0; i < NUM_SCREENS; i++)
    {
        lastFullRefresh[i] = NULL;
    }
}

void refreshFromMemory()
{
    for (uint i = 0; i < NUM_SCREENS; i++)
    {
        int *taskParam = new int;
        *taskParam = i;

        xTaskCreate([](void *pvParameters)
                    {
            const int epdIndex = *(int *)pvParameters;
            delete (int *)pvParameters;
           displays[epdIndex].refresh(false);
           vTaskDelete(NULL); },
                    "PrepareUpd", 4096, taskParam, tskIDLE_PRIORITY, NULL);
    }
}

void setupDisplays()
{
    std::lock_guard<std::mutex> lockMcp(mcpMutex);

    for (uint i = 0; i < NUM_SCREENS; i++)
    {
        displays[i].init(0, true, 30);
    }

    updateQueue = xQueueCreate(UPDATE_QUEUE_SIZE, sizeof(UpdateDisplayTaskItem));

    xTaskCreate(prepareDisplayUpdateTask, "PrepareUpd", 4096, NULL, 11, NULL);

    for (uint i = 0; i < NUM_SCREENS; i++)
    {
        // epdUpdateSemaphore[i] = xSemaphoreCreateBinary();
        // xSemaphoreGive(epdUpdateSemaphore[i]);

        int *taskParam = new int;
        *taskParam = i;

        xTaskCreate(updateDisplay, ("EpdUpd" + String(i)).c_str(), 2048, taskParam, 11, &tasks[i]); // create task
    }

    epdContent = {"B",
                  "T",
                  "C",
                  "L",
                  "O",
                  "C",
                  "K"};

    setEpdContent(epdContent);
}

void setEpdContent(std::array<String, NUM_SCREENS> newEpdContent)
{
    setEpdContent(newEpdContent, false);
}

void setEpdContent(std::array<String, NUM_SCREENS> newEpdContent, bool forceUpdate)
{
    std::lock_guard<std::mutex> lock(epdUpdateMutex);

    waitUntilNoneBusy();

    for (uint i = 0; i < NUM_SCREENS; i++)
    {
        if (newEpdContent[i].compareTo(currentEpdContent[i]) != 0 || forceUpdate)
        {
            epdContent[i] = newEpdContent[i];
            UpdateDisplayTaskItem dispUpdate = {i};
            xQueueSend(updateQueue, &dispUpdate, portMAX_DELAY);
        }
    }
}

void prepareDisplayUpdateTask(void *pvParameters)
{
    UpdateDisplayTaskItem receivedItem;

    while (1)
    {
        // Wait for a work item to be available in the queue
        if (xQueueReceive(updateQueue, &receivedItem, portMAX_DELAY))
        {
            uint epdIndex = receivedItem.dispNum;
            std::lock_guard<std::mutex> lock(epdMutex[epdIndex]);
           // displays[epdIndex].init(0, false); // Little longer reset duration because of MCP

            bool updatePartial = true;

            if (strstr(epdContent[epdIndex].c_str(), "/") != NULL)
            {
                String top = epdContent[epdIndex].substring(0, epdContent[epdIndex].indexOf("/"));
                String bottom = epdContent[epdIndex].substring(epdContent[epdIndex].indexOf("/") + 1);
                splitText(epdIndex, top, bottom, updatePartial);
            }
            else if (epdContent[epdIndex].startsWith(F("qr")))
            {
                renderQr(epdIndex, epdContent[epdIndex], updatePartial);
            }
            else if (epdContent[epdIndex].length() > 5)
            {
                renderText(epdIndex, epdContent[epdIndex], updatePartial);
            }
            else
            {

                if (epdContent[epdIndex].length() > 1)
                {
                    showChars(epdIndex, epdContent[epdIndex], updatePartial, &FONT_MEDIUM);
                }
                else
                {
                    showDigit(epdIndex, epdContent[epdIndex].c_str()[0], updatePartial, &FONT_BIG);
                }
            }

            xTaskNotifyGive(tasks[epdIndex]);
        }
    }
}

extern "C" void updateDisplay(void *pvParameters) noexcept
{
    const int epdIndex = *(int *)pvParameters;
    delete (int *)pvParameters;

    for (;;)
    {
        // Wait for the task notification
        ulTaskNotifyTake(pdTRUE, portMAX_DELAY);

        std::lock_guard<std::mutex> lock(epdMutex[epdIndex]);

        {
            std::lock_guard<std::mutex> lockMcp(mcpMutex);

            displays[epdIndex].init(0, false, 40);
        }
        uint count = 0;
        while (EPD_BUSY[epdIndex].digitalRead() == HIGH || count < 10)
        {
            vTaskDelay(pdMS_TO_TICKS(100));
            count++;
        }

        bool updatePartial = true;

        // Full Refresh every x minutes
        if (!lastFullRefresh[epdIndex] || (millis() - lastFullRefresh[epdIndex]) > (preferences.getUInt("fullRefreshMin", DEFAULT_MINUTES_FULL_REFRESH) * 60 * 1000))
        {
            updatePartial = false;
        }

        char tries = 0;
        while (tries < 3)
        {
            if (displays[epdIndex].displayWithReturn(updatePartial))
            {
                displays[epdIndex].powerOff();
                currentEpdContent[epdIndex] = epdContent[epdIndex];
                if (!updatePartial)
                    lastFullRefresh[epdIndex] = millis();

                if (eventSourceTaskHandle != NULL)
                    xTaskNotifyGive(eventSourceTaskHandle);

                break;
            }

            vTaskDelay(pdMS_TO_TICKS(100));
            tries++;
        }
    }
}

void splitText(const uint dispNum, const String &top, const String &bottom, bool partial)
{
    displays[dispNum].setRotation(2);
    displays[dispNum].setFont(&FONT_SMALL);
    displays[dispNum].setTextColor(getFgColor());

    // Top text
    int16_t ttbx, ttby;
    uint16_t ttbw, ttbh;
    displays[dispNum].getTextBounds(top, 0, 0, &ttbx, &ttby, &ttbw, &ttbh);
    uint16_t tx = ((displays[dispNum].width() - ttbw) / 2) - ttbx;
    uint16_t ty = ((displays[dispNum].height() - ttbh) / 2) - ttby - ttbh / 2 - 12;

    // Bottom text
    int16_t tbbx, tbby;
    uint16_t tbbw, tbbh;
    displays[dispNum].getTextBounds(bottom, 0, 0, &tbbx, &tbby, &tbbw, &tbbh);
    uint16_t bx = ((displays[dispNum].width() - tbbw) / 2) - tbbx;
    uint16_t by = ((displays[dispNum].height() - tbbh) / 2) - tbby + tbbh / 2 + 12;

    // Make separator as wide as the shortest text.
    uint16_t lineWidth, lineX;
    if (tbbw < ttbh)
        lineWidth = tbbw;
    else
        lineWidth = ttbw;
    lineX = round((displays[dispNum].width() - lineWidth) / 2);

    displays[dispNum].fillScreen(getBgColor());
    displays[dispNum].setCursor(tx, ty);
    displays[dispNum].print(top);
    displays[dispNum].fillRoundRect(lineX, displays[dispNum].height() / 2 - 3, lineWidth, 6, 3, getFgColor());
    displays[dispNum].setCursor(bx, by);
    displays[dispNum].print(bottom);
}

void showDigit(const uint dispNum, char chr, bool partial, const GFXfont *font)
{
    String str(chr);
    displays[dispNum].setRotation(2);
    displays[dispNum].setFont(font);
    displays[dispNum].setTextColor(getFgColor());
    int16_t tbx, tby;
    uint16_t tbw, tbh;
    displays[dispNum].getTextBounds(str, 0, 0, &tbx, &tby, &tbw, &tbh);
    // center the bounding box by transposition of the origin:
    uint16_t x = ((displays[dispNum].width() - tbw) / 2) - tbx;
    uint16_t y = ((displays[dispNum].height() - tbh) / 2) - tby;
    displays[dispNum].fillScreen(getBgColor());
    displays[dispNum].setCursor(x, y);
    displays[dispNum].print(str);
}

void showChars(const uint dispNum, const String &chars, bool partial, const GFXfont *font)
{
    displays[dispNum].setRotation(2);
    displays[dispNum].setFont(font);
    displays[dispNum].setTextColor(getFgColor());
    int16_t tbx, tby;
    uint16_t tbw, tbh;
    displays[dispNum].getTextBounds(chars, 0, 0, &tbx, &tby, &tbw, &tbh);
    // center the bounding box by transposition of the origin:
    uint16_t x = ((displays[dispNum].width() - tbw) / 2) - tbx;
    uint16_t y = ((displays[dispNum].height() - tbh) / 2) - tby;
    displays[dispNum].fillScreen(getBgColor());
    displays[dispNum].setCursor(x, y);
    displays[dispNum].print(chars);
}

int getBgColor()
{
    return bgColor;
}

int getFgColor()
{
    return fgColor;
}

void setBgColor(int color)
{
    bgColor = color;
}

void setFgColor(int color)
{
    fgColor = color;
}

std::array<String, NUM_SCREENS> getCurrentEpdContent()
{
    return currentEpdContent;
}
void renderText(const uint dispNum, const String &text, bool partial)
{
    displays[dispNum].setRotation(2);
    displays[dispNum].setPartialWindow(0, 0, displays[dispNum].width(), displays[dispNum].height());
    displays[dispNum].fillScreen(GxEPD_WHITE);
    displays[dispNum].setTextColor(GxEPD_BLACK);
    displays[dispNum].setCursor(0, 50);

    std::stringstream ss;
    ss.str(text.c_str());

    std::string line;

    while (std::getline(ss, line, '\n'))
    {
        if (line.rfind("*", 0) == 0)
        {
            line.erase(std::remove(line.begin(), line.end(), '*'), line.end());

            displays[dispNum].setFont(&FreeSansBold9pt7b);
            displays[dispNum].println(line.c_str());
        }
        else
        {
            displays[dispNum].setFont(&FreeSans9pt7b);
            displays[dispNum].println(line.c_str());
        }
    }
}

void renderQr(const uint dispNum, const String &text, bool partial)
{
#ifdef USE_QR

    uint8_t tempBuffer[800];
    bool ok = qrcodegen_encodeText(text.substring(2).c_str(), tempBuffer, qrcode, qrcodegen_Ecc_LOW,
                                   qrcodegen_VERSION_MIN, qrcodegen_VERSION_MAX, qrcodegen_Mask_AUTO, true);

    const int size = qrcodegen_getSize(qrcode);

    const int padding = floor(float(displays[dispNum].width() - (size * 4)) / 2);
    const int paddingY = floor(float(displays[dispNum].height() - (size * 4)) / 2);
    displays[dispNum].setRotation(2);

    displays[dispNum].setPartialWindow(0, 0, displays[dispNum].width(), displays[dispNum].height());
    displays[dispNum].fillScreen(GxEPD_WHITE);
    const int border = 0;

    for (int y = -border; y < size * 4 + border; y++)
    {
        for (int x = -border; x < size * 4 + border; x++)
        {
            displays[dispNum].drawPixel(padding + x, paddingY + y, qrcodegen_getModule(qrcode, floor(float(x) / 4), floor(float(y) / 4)) ? GxEPD_BLACK : GxEPD_WHITE);
        }
    }
#endif
}

void waitUntilNoneBusy()
{
    for (int i = 0; i < NUM_SCREENS; i++)
    {
        uint count = 0;
        while (EPD_BUSY[i].digitalRead())
        {
            count++;
            vTaskDelay(10);
            if (count == 200)
            {
                // displays[i].init(0, false);
                vTaskDelay(100);
            }
            else if (count > 205)
            {
                Serial.printf("Busy timeout %d", i);
                break;
            }
        }
    }
}