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ink-board/main/display/eink_display_handler.cpp

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#include "display/eink_display_handler.h"
#include "display/constants.h"
#include "common/constants.h"
#include "esp_lcd_touch_gt911.h"
#include "esp_log.h"
#include <driver/i2c.h>
#include <vector>
#include "common/semaphore_guard.h"
#define TAG "EInkDisplayHandler"
#define DISPLAY_BUFFER_SIZE (EINK_HEIGHT* EINK_WIDTH) / 8 // 1 bit per pixels
#define MINIMUM_PIN_SETUP_DELAY_MS 10
#define MINIMUM_POWER_ON_DELAY_MS 100
#define PARTIAL_REFRESH_THRESHOLD 5 // Full refresh every N partial refreshes
// Static flag to prevent multiple instances (these buffers are large, only one display allowed)
static bool display_instance_exists = false;
EInkDisplayHandler::EInkDisplayHandler() {
if (display_instance_exists) {
ESP_LOGE(TAG, "Only one EInkDisplayHandler instance allowed!");
return;
}
display_instance_exists = true;
black_data_ = static_cast<uint8_t*>(heap_caps_malloc(DISPLAY_BUFFER_SIZE, MALLOC_CAP_SPIRAM));
white_data_ = static_cast<uint8_t*>(heap_caps_malloc(DISPLAY_BUFFER_SIZE, MALLOC_CAP_SPIRAM));
draw_buffer_ = static_cast<uint8_t*>(heap_caps_malloc(DISPLAY_BUFFER_SIZE, MALLOC_CAP_SPIRAM));
old_buffer_ = static_cast<uint8_t*>(heap_caps_malloc(DISPLAY_BUFFER_SIZE, MALLOC_CAP_SPIRAM));
// Check for allocation failures
if (!black_data_ || !white_data_ || !draw_buffer_ || !old_buffer_) {
ESP_LOGE(TAG, "Failed to allocate display buffers!");
return;
}
memset(black_data_, 0xFF, DISPLAY_BUFFER_SIZE); // eink uses 1 for black
memset(white_data_, 0x00, DISPLAY_BUFFER_SIZE);
memset(draw_buffer_, 0x00, DISPLAY_BUFFER_SIZE); // start with all white (0 = white in e-ink)
memset(old_buffer_, 0x00, DISPLAY_BUFFER_SIZE); // start with all white (0 = white in e-ink)
refresh_mutex_ = xSemaphoreCreateMutex();
if (refresh_mutex_ == nullptr) {
ESP_LOGE(TAG, "Failed to create refresh mutex");
}
}
EInkDisplayHandler::~EInkDisplayHandler() {
if (refresh_mutex_ != nullptr) {
vSemaphoreDelete(refresh_mutex_);
}
if (tp_handle_ != nullptr) {
esp_lcd_touch_del(tp_handle_);
}
if (tp_io_handle_ != nullptr) {
esp_lcd_panel_io_del(tp_io_handle_);
}
if (black_data_ != nullptr) {
heap_caps_free(black_data_);
black_data_ = nullptr;
}
if (white_data_ != nullptr) {
heap_caps_free(white_data_);
white_data_ = nullptr;
}
if (draw_buffer_ != nullptr) {
heap_caps_free(draw_buffer_);
draw_buffer_ = nullptr;
}
if (old_buffer_ != nullptr) {
heap_caps_free(old_buffer_);
old_buffer_ = nullptr;
}
display_instance_exists = false;
}
esp_err_t EInkDisplayHandler::deep_sleep_display(void) {
ESP_LOGV(TAG, "Putting display into deep sleep mode...");
if (is_deep_sleep_) {
ESP_LOGW(TAG, "Display is already in deep sleep mode");
return ESP_OK;
}
{
esp_err_t err = ESP_OK;
TransactionGuard transaction_guard(this->epd_handler_);
err = transaction_guard.begin(pdMS_TO_TICKS(5000));
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to begin transaction for deep sleep: %s", esp_err_to_name(err));
return err;
}
epd_handler_.wait_for_idle();
err = epd_handler_.epd_write_cmd(0x02, transaction_guard.transaction_id()); // power off
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send power off command: %s", esp_err_to_name(err));
return err;
}
epd_handler_.wait_for_idle();
err = epd_handler_.epd_write_cmd(0x07, transaction_guard.transaction_id()); //deep sleep
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send deep sleep command: %s", esp_err_to_name(err));
return err;
}
err = epd_handler_.epd_write_data(0xA5, transaction_guard.transaction_id());
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send deep sleep data: %s", esp_err_to_name(err));
return err;
}
is_deep_sleep_ = true;
return err;
}
}
esp_err_t EInkDisplayHandler::refresh_display() {
esp_err_t err = ESP_OK;
if (is_deep_sleep_) {
err = full_write(draw_buffer_, true);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Full write failed during refresh_display: %s", esp_err_to_name(err));
return err;
}
} else {
// refresh does not correctly work after recovering from deep sleep due to sram reset
{
ESP_LOGV(TAG, "Waiting for display to be idle...");
TransactionGuard transaction_guard(this->epd_handler_);
err = transaction_guard.begin(pdMS_TO_TICKS(10000));
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to begin transaction for display refresh: %s", esp_err_to_name(err));
return err;
}
if (is_deep_sleep_) {
epd_init_internal_(transaction_guard.transaction_id());
}
epd_handler_.wait_for_idle();
ESP_LOGV(TAG, "Starting display refresh...");
err = epd_handler_.epd_write_cmd(0x92, transaction_guard.transaction_id()); // enter normal mode
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to enter normal mode: %s", esp_err_to_name(err));
return err;
}
err = epd_handler_.epd_write_cmd(0x12, transaction_guard.transaction_id()); // display refresh
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send display refresh command: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS)); // at least 200us delay
epd_handler_.wait_for_idle();
}
}
{
SemaphoreGuard guard(refresh_mutex_);
if (guard.take(pdMS_TO_TICKS(5000)) != pdTRUE) {
ESP_LOGE(TAG, "Refresh mutex timeout in refresh_display");
return ESP_ERR_TIMEOUT;
}
partial_refresh_count_ = 0;
force_full_refresh_ = false;
}
ESP_LOGV(TAG, "Refresh complete");
return ESP_OK;
}
esp_err_t EInkDisplayHandler::full_write(const uint8_t* framebuffer, const bool white_basemap) {
ESP_LOGV(TAG, "Starting full refresh (3 seconds)...");
esp_err_t err = ESP_OK;
{
TransactionGuard transaction_guard(this->epd_handler_);
err = transaction_guard.begin(pdMS_TO_TICKS(10000));
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to begin transaction for full refresh: %s", esp_err_to_name(err));
return err;
}
if (is_deep_sleep_) {
epd_init_internal_(transaction_guard.transaction_id());
}
write_to_buffer_(framebuffer, RefreshArea { 0, 0, DISPLAY_WIDTH - 1, DISPLAY_HEIGHT - 1 });
epd_handler_.wait_for_idle();
// Step 0: Enter normal mode
err = epd_handler_.epd_write_cmd(0x92, transaction_guard.transaction_id()); // enter normal mode
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to enter normal mode: %s", esp_err_to_name(err));
return err;
}
// Step 1: Write old data (0x10) - Arduino uses 0xFF (all white) for base map
{
err = epd_handler_.epd_write_cmd(0x10, transaction_guard.transaction_id());
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send old data command: %s", esp_err_to_name(err));
return err;
}
err = epd_handler_.transfer_spi_data(white_basemap ? black_data_ : white_data_, DISPLAY_BUFFER_SIZE, transaction_guard.transaction_id()); // Send all white data (0xFF)
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send all white data for old data: %s", esp_err_to_name(err));
return err;
}
}
// Step 2: Write new data (0x13)
{
err = epd_handler_.epd_write_cmd(0x13, transaction_guard.transaction_id());
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send new data command: %s", esp_err_to_name(err));
return err;
}
err = epd_handler_.transfer_spi_data(draw_buffer_, DISPLAY_BUFFER_SIZE, transaction_guard.transaction_id()); // Send new framebuffer data
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send framebuffer data for new data: %s", esp_err_to_name(err));
return err;
}
}
// Step 3: Trigger display refresh (DRF)
err = epd_handler_.epd_write_cmd(0x12, transaction_guard.transaction_id());
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send display refresh command: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS)); // at least 200us delay
ESP_LOGV(TAG, "Display refresh triggered, BUSY pin: %d", gpio_get_level(PIN_BUSY));
// Wait for refresh to complete
epd_handler_.wait_for_idle();
}
err = deep_sleep_display();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to enter deep sleep after full refresh: %s", esp_err_to_name(err));
return err;
}
refresh_area_.reset();
memcpy(old_buffer_, draw_buffer_, DISPLAY_BUFFER_SIZE);
ESP_LOGV(TAG, "Full refresh complete");
return ESP_OK;
}
// TODO: Partial refresh is inverted in color
esp_err_t EInkDisplayHandler::partial_refresh(const uint8_t* incoming_partial_framebuffer, const RefreshArea& incoming_area, const bool is_last_partial_update) {
ESP_LOGV(TAG, "Starting partial refresh (0.3 seconds)...");
esp_err_t err = ESP_OK;
write_to_buffer_(incoming_partial_framebuffer, incoming_area);
// Always expand refresh_area_ to include incoming_area
refresh_area_.expand_to_include(incoming_area);
if (!is_last_partial_update) {
ESP_LOGV(TAG, "Partial refresh skipped (not last partial update)");
return ESP_OK;
}
{
TransactionGuard transaction_guard(this->epd_handler_);
err = transaction_guard.begin(pdMS_TO_TICKS(5000));
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to begin transaction for partial refresh: %s", esp_err_to_name(err));
return err;
}
// Wake display from deep sleep INSIDE the transaction to prevent race conditions
if (is_deep_sleep_) {
err = epd_init_internal_(transaction_guard.transaction_id());
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize EPD for partial refresh: %s", esp_err_to_name(err));
return err;
}
err = refresh_old_buffer_(transaction_guard.transaction_id());
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to refresh old buffer during partial refresh init: %s", esp_err_to_name(err));
return err;
}
}
RefreshArea area = refresh_area_;
if (area.x1 % 8 != 0 || area.x2 % 8 != 7) {
ESP_LOGE(TAG, "Partial refresh area x1 and x2 must be byte-aligned (x1 %% 8 == 0 and x2 %% 8 == 7)");
ESP_LOGV(TAG, "Given area: x1=%d, x2=%d", area.x1, area.x2);
return ESP_ERR_INVALID_ARG;
}
// Calculate partial buffer size based on the refresh area
const uint32_t area_width_bytes = (area.x2 - area.x1 + 1) / 8;
const uint32_t area_height = area.y2 - area.y1 + 1;
const size_t partial_buffer_size = area_width_bytes * area_height;
// uint8_t* partial_buffer = new uint8_t[partial_buffer_size];
uint8_t* partial_buffer = static_cast<uint8_t*>(heap_caps_malloc(partial_buffer_size, MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL));
if (partial_buffer == nullptr) {
ESP_LOGE(TAG, "Failed to allocate partial buffer for partial refresh");
return ESP_ERR_NO_MEM;
}
// Copy the relevant area from draw_buffer_ to partial_buffer
for (int32_t row = 0; row < area_height; ++row) {
uint32_t fb_y = area.y1 + row;
uint32_t fb_x_byte_start = area.x1 / 8;
uint8_t* fb_ptr = &draw_buffer_[fb_y * (DISPLAY_WIDTH / 8) + fb_x_byte_start];
uint8_t* dest_ptr = &partial_buffer[row * area_width_bytes];
memcpy(dest_ptr, fb_ptr, area_width_bytes);
}
epd_handler_.wait_for_idle();
// Step 1 VCOM setting
std::vector<uint8_t> vcom_data = { 0xA9, 0x07 };
err = epd_handler_.epd_write_cmd_with_data(0x50, vcom_data, transaction_guard.transaction_id()); // VCOM for partial refresh
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to set VCOM for partial refresh: %s", esp_err_to_name(err));
return err;
}
// Step 2: Enter partial refresh mode
err = epd_handler_.epd_write_cmd(0x91, transaction_guard.transaction_id()); // Enter partial mode
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to enter partial refresh mode: %s", esp_err_to_name(err));
return err;
}
// Step 3: Set partial window
{
// ------DD
// DDDDD000
// ------DD
// DDDDD111
// ------DD
// DDDDDDDD
// ------DD
// DDDDDDDD
// -------D
// area should be multiple of 8 in x direction
const int32_t x_bank_start = area.x1 >> 3;
const int32_t x_bank_end = area.x2 >> 3;
std::vector<uint8_t> window_data = {
// x start, [9:8] bit -> 6 and 7 bits of x_bank_start
static_cast<uint8_t>((x_bank_start >> 5) & 0x03),
// x start, [7:3] bit + 3 bits of 0 -> 5 bits of x_bank_start and pad 3 LSBs as 0
static_cast<uint8_t>((x_bank_start & 0x1F) << 3),
// x end, [9:8] bit
static_cast<uint8_t>((x_bank_end >> 5) & 0x03),
// x end, [7:3] bit + 3 bits of 1
static_cast<uint8_t>(((x_bank_end & 0x1F) << 3) | 0x07),
// y start, [9:8] bit
static_cast<uint8_t>((area.y1 >> 8) & 0x03),
// y start, [7:0] bit
static_cast<uint8_t>(area.y1 & 0xFF),
// y end, [9:8] bit
static_cast<uint8_t>((area.y2 >> 8) & 0x03),
// y end, [7:0] bit
static_cast<uint8_t>(area.y2 & 0xFF),
0x01 // Gates scan both inside and outside of the partial window
};
ESP_LOGV(TAG, "Setting partial window: x1=%d, y1=%d, x2=%d, y2=%d",
area.x1, area.y1, area.x2, area.y2);
ESP_LOGV(TAG, "Partial window data: %02X %02X %02X %02X %02X %02X %02X %02X",
window_data[0], window_data[1], window_data[2], window_data[3], window_data[4],
window_data[5], window_data[6], window_data[7]);
err = epd_handler_.epd_write_cmd_with_data(0x90, window_data, transaction_guard.transaction_id()); // Set partial window
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send set partial window command: %s", esp_err_to_name(err));
return err;
}
}
// Step 5: Write new data (0x13)
{
err = epd_handler_.epd_write_cmd(0x13, transaction_guard.transaction_id());
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send new data command for partial refresh: %s", esp_err_to_name(err));
heap_caps_free(partial_buffer);
return err;
}
// Send only the partial area data, not the full display buffer
ESP_LOGV(TAG, "Sending new partial buffer: %zu bytes (area: %dx%d)",
partial_buffer_size, area_width_bytes * 8, area_height);
err = epd_handler_.transfer_spi_data(partial_buffer, partial_buffer_size, transaction_guard.transaction_id(), true); // Inverted for partial refresh
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send partial_buffer data for partial refresh: %s", esp_err_to_name(err));
heap_caps_free(partial_buffer);
return err;
}
memcpy(old_buffer_, draw_buffer_, DISPLAY_BUFFER_SIZE);
}
// Clean up partial buffer
heap_caps_free(partial_buffer);
// Step 6: Trigger partial display refresh (DRF)
// Use 0x12 (Display Update) command - same as full refresh, per sample code
err = epd_handler_.epd_write_cmd(0x12, transaction_guard.transaction_id());
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send display refresh command for partial refresh: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS)); // at least 200us delay
epd_handler_.wait_for_idle();
// Step 7: Exit partial mode
err = epd_handler_.epd_write_cmd(0x92, transaction_guard.transaction_id());
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to exit partial refresh mode: %s", esp_err_to_name(err));
return err;
}
}
ESP_LOGV(TAG, "Partial refresh complete");
err = deep_sleep_display();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to enter deep sleep after partial refresh: %s", esp_err_to_name(err));
return err;
}
if (force_full_refresh_) {
ESP_LOGV(TAG, "Full refresh already requested, skipping partial refresh count increment");
err = refresh_display();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to perform forced full refresh: %s", esp_err_to_name(err));
return err;
}
return ESP_OK;
}
{
SemaphoreGuard guard(refresh_mutex_);
if (guard.take(pdMS_TO_TICKS(5000)) != pdTRUE) {
ESP_LOGE(TAG, "Refresh mutex timeout in partial_refresh");
return ESP_ERR_TIMEOUT;
}
if (partial_refresh_count_ < UINT32_MAX) {
partial_refresh_count_++;
}
if (partial_refresh_count_ >= PARTIAL_REFRESH_THRESHOLD) {
ESP_LOGV(TAG, "Partial refresh count %u reached threshold %u, next refresh will be full",
partial_refresh_count_, PARTIAL_REFRESH_THRESHOLD);
force_full_refresh_ = true;
partial_refresh_count_ = 0;
}
}
refresh_area_.reset();
return ESP_OK;
}
esp_err_t EInkDisplayHandler::clear_display(void) {
ESP_LOGV(TAG, "Clearing display to all white...");
esp_err_t err = full_write(white_data_, false);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to clear display: %s", esp_err_to_name(err));
return err;
}
ESP_LOGV(TAG, "Display cleared to all white");
return ESP_OK;
}
void EInkDisplayHandler::write_to_buffer_(const uint8_t* src_buffer, const RefreshArea& area) {
// Copy the relevant area from src_buffer to draw_buffer_
const uint32_t area_width_bytes = (area.x2 - area.x1 + 1) / 8;
const uint32_t area_height = area.y2 - area.y1 + 1;
for (int32_t row = 0; row < area_height; ++row) {
uint32_t fb_y = area.y1 + row;
uint32_t fb_x_byte_start = area.x1 / 8;
const uint8_t* src_ptr = &src_buffer[row * area_width_bytes];
uint8_t* dest_ptr = &draw_buffer_[fb_y * (DISPLAY_WIDTH / 8) + fb_x_byte_start];
memcpy(dest_ptr, src_ptr, area_width_bytes);
}
}
// Request a full refresh on next flush
void EInkDisplayHandler::request_full_refresh(void) {
SemaphoreGuard guard(refresh_mutex_);
if (guard.take(pdMS_TO_TICKS(100))) {
force_full_refresh_ = true;
partial_refresh_count_ = 0;
ESP_LOGV(TAG, "Full refresh requested");
} else {
ESP_LOGE(TAG, "Failed to take refresh mutex to request full refresh");
}
}
esp_err_t EInkDisplayHandler::init_devices(EventGroupHandle_t system_event_group) {
esp_err_t err;
err = init_display_pins_();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize display pins: %s", esp_err_to_name(err));
return err;
}
err = this->epd_handler_.init();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize EPD handler: %s", esp_err_to_name(err));
return err;
}
err = init_touch_();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize touch: %s", esp_err_to_name(err));
return err;
}
// if system_event_group is provided, set display ready bits
if (system_event_group != nullptr) {
// Indicate that display is ready
xEventGroupSetBits(system_event_group, DISPLAY_READY_BIT | TOUCH_CALIBRATED_BIT);
ESP_LOGV(TAG, "Display marked as ready");
}
return ESP_OK;
}
esp_err_t EInkDisplayHandler::init_display_pins_(void) {
ESP_LOGV(TAG, "Initializing E-Ink display handler...");
esp_err_t ret;
// Initialize GPIO pins
gpio_config_t io_conf = {};
io_conf.pin_bit_mask = (1ULL << PIN_DC) | (1ULL << PIN_RST);
io_conf.mode = GPIO_MODE_OUTPUT;
io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
io_conf.intr_type = GPIO_INTR_DISABLE;
ret = gpio_config(&io_conf);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to configure GPIO pins: %s", esp_err_to_name(ret));
return ret;
}
// Configure BUSY pin as input (no pull-up like sample code)
io_conf.pin_bit_mask = (1ULL << PIN_BUSY);
io_conf.mode = GPIO_MODE_INPUT;
io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
ret = gpio_config(&io_conf);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to configure BUSY pin: %s", esp_err_to_name(ret));
return ret;
}
return ESP_OK;
}
esp_err_t EInkDisplayHandler::epd_init_internal_(uint32_t transaction_id) {
ESP_LOGV(TAG, "Initializing EPD...");
esp_err_t err;
// 1. Hardware Reset
err = gpio_set_level(PIN_RST, 0);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to set PIN_RST low: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS));
err = gpio_set_level(PIN_RST, 1);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to set PIN_RST high: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS));
// 2. Initialization Sequence
std::vector<uint8_t> panel_setting_data = { 0x1F };
err = epd_handler_.epd_write_cmd_with_data(0x00, panel_setting_data, transaction_id); // Panel Setting
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send Panel Setting command: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS));
std::vector<uint8_t> vcom_data = { 0x10, 0x07 };
err = epd_handler_.epd_write_cmd_with_data(0x50, vcom_data, transaction_id); // VCOM
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send VCOM command: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS));
err = epd_handler_.epd_write_cmd(0x04, transaction_id); // Power ON
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send Power ON command: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_POWER_ON_DELAY_MS)); // Wait for power on
// Check BUSY pin with detailed logging
ESP_LOGV(TAG, "Waiting for EPD to be ready after power on...");
ESP_LOGV(TAG, "BUSY pin level after power on: %d (0=BUSY, 1=FREE)", gpio_get_level(PIN_BUSY));
epd_handler_.wait_for_idle();
std::vector<uint8_t> booster_data = { 0x27, 0x27, 0x18, 0x17 };
err = epd_handler_.epd_write_cmd_with_data(0x06, booster_data, transaction_id); // Booster Soft Start
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send Booster Soft Start command: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS));
// Enhanced display drive commands
std::vector<uint8_t> e0_data = { 0x02 };
err = epd_handler_.epd_write_cmd_with_data(0xE0, e0_data, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send Enhanced Display Drive command: %s", esp_err_to_name(err));
return err;
}
std::vector<uint8_t> e5_data = { 0x5A };
err = epd_handler_.epd_write_cmd_with_data(0xE5, e5_data, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send Enhanced Display Drive command: %s", esp_err_to_name(err));
return err;
}
is_deep_sleep_ = false;
return err;
}
// Internal version that uses an existing transaction (no separate TransactionGuard)
esp_err_t EInkDisplayHandler::epd_init_partial_internal_(uint32_t transaction_id) {
ESP_LOGV(TAG, "Initializing EPD for partial refresh (internal)...");
esp_err_t err = ESP_OK;
// 1. Hardware Reset
err = gpio_set_level(PIN_RST, 0);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to set PIN_RST low: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS));
err = gpio_set_level(PIN_RST, 1);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to set PIN_RST high: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS));
// 2. Panel Setting
std::vector<uint8_t> panel_setting_data = { 0x1F };
err = epd_handler_.epd_write_cmd_with_data(0x00, panel_setting_data, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send Panel Setting command: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_PIN_SETUP_DELAY_MS));
// 3. Power ON
err = epd_handler_.epd_write_cmd(0x04, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send Power ON command: %s", esp_err_to_name(err));
return err;
}
vTaskDelay(pdMS_TO_TICKS(MINIMUM_POWER_ON_DELAY_MS));
epd_handler_.wait_for_idle();
// 4. Partial initialization sequence - Enhanced Display Drive
std::vector<uint8_t> e0_data = { 0x02 };
err = epd_handler_.epd_write_cmd_with_data(0xE0, e0_data, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send Enhanced Display Drive command (E0): %s", esp_err_to_name(err));
return err;
}
std::vector<uint8_t> e5_data = { 0x6E };
err = epd_handler_.epd_write_cmd_with_data(0xE5, e5_data, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send Enhanced Display Drive command (E5): %s", esp_err_to_name(err));
return err;
}
is_deep_sleep_ = false;
err = refresh_old_buffer_(transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to refresh old buffer during partial init: %s", esp_err_to_name(err));
return err;
}
ESP_LOGV(TAG, "EPD partial init (internal) complete");
return ESP_OK;
}
esp_err_t EInkDisplayHandler::init_touch_() {
ESP_LOGV(TAG, "Initializing touch...");
esp_err_t err;
// 1. Initialize I2C Bus
i2c_config_t conf = {};
conf.mode = I2C_MODE_MASTER;
conf.sda_io_num = PIN_TOUCH_SDA;
conf.scl_io_num = PIN_TOUCH_SCL;
conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
conf.master.clk_speed = 400000;
err = i2c_param_config(I2C_NUM_0, &conf);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to configure I2C parameters: %s", esp_err_to_name(err));
return err;
}
err = i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, 0, 0, 0);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to install I2C driver: %s", esp_err_to_name(err));
return err;
}
ESP_LOGV("DisplayHandler", "I2C driver installed");
// 2. Initialize GT911
ESP_LOGV("DisplayHandler", "Initializing GT911 touch controller...");
esp_lcd_panel_io_i2c_config_t tp_io_config = {};
// temporarily disable -Wmissing-field-initializers, as ESP_LCD_TOUCH_IO_I2C_GT911_CONFIG macro does not set all fields
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
esp_lcd_panel_io_i2c_config_t default_tp_io_config = ESP_LCD_TOUCH_IO_I2C_GT911_CONFIG();
#pragma GCC diagnostic pop
tp_io_config.dev_addr = default_tp_io_config.dev_addr;
tp_io_config.control_phase_bytes = default_tp_io_config.control_phase_bytes;
tp_io_config.dc_bit_offset = default_tp_io_config.dc_bit_offset;
tp_io_config.lcd_cmd_bits = default_tp_io_config.lcd_cmd_bits;
tp_io_config.flags = default_tp_io_config.flags;
esp_lcd_new_panel_io_i2c(I2C_NUM_0, &tp_io_config, &tp_io_handle_);
// GT911-specific config with I2C address (0x5D = INT low during reset)
static esp_lcd_touch_io_gt911_config_t gt911_config = {
.dev_addr = ESP_LCD_TOUCH_IO_I2C_GT911_ADDRESS // 0x5D
};
esp_lcd_touch_config_t tp_cfg = {};
tp_cfg.x_max = DISPLAY_WIDTH;
tp_cfg.y_max = DISPLAY_HEIGHT;
tp_cfg.rst_gpio_num = PIN_TOUCH_RST;
tp_cfg.int_gpio_num = PIN_TOUCH_IRQ;
tp_cfg.driver_data = &gt911_config; // Pass GT911-specific config for automatic reset
err = esp_lcd_touch_new_i2c_gt911(tp_io_handle_, &tp_cfg, &tp_handle_);
if (err == ESP_OK && tp_handle_ != nullptr) {
ESP_LOGV(TAG, "GT911 touch controller initialized successfully");
} else {
ESP_LOGE(TAG, "GT911 touch controller initialization failed: %s", esp_err_to_name(err));
tp_handle_ = nullptr;
}
return err;
}
esp_err_t EInkDisplayHandler::refresh_old_buffer_(uint32_t transaction_id) {
ESP_LOGV(TAG, "Refreshing display SRAM to restore state after wake...");
esp_err_t err;
err = epd_handler_.epd_write_cmd(0x92, transaction_id); // enter normal mode
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to enter normal mode: %s", esp_err_to_name(err));
return err;
}
// Write OLD data (0x10) as all 0x00 (white in e-ink terms)
// This tells the controller: "assume display was all white"
// Matches sample's EPD_WhiteScreen_ALL() which uses 0x00 for old SRAM
// The differential refresh: old=0 + new=0 → stay white, old=0 + new=1 → drive to black
err = epd_handler_.epd_write_cmd(0x10, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send old data command: %s", esp_err_to_name(err));
return err;
}
// Send the old buffer as old data
err = epd_handler_.transfer_spi_data(old_buffer_, DISPLAY_BUFFER_SIZE, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send white baseline to old SRAM: %s", esp_err_to_name(err));
return err;
}
// Write NEW data (0x13) with the actual display content
// This restores the display to show old_buffer_ content
err = epd_handler_.epd_write_cmd(0x13, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send new data command: %s", esp_err_to_name(err));
return err;
}
// Send the last displayed content to new SRAM
err = epd_handler_.transfer_spi_data(old_buffer_, DISPLAY_BUFFER_SIZE, transaction_id);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to send display content to new SRAM: %s", esp_err_to_name(err));
return err;
}
ESP_LOGV(TAG, "Display SRAM restored successfully");
return ESP_OK;
}
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