[nextion] memory optimization (#9164)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/nextion/nextion.cpp

@@ -164,7 +164,7 @@ void Nextion::dump_config() {
 #endif  // USE_NEXTION_MAX_COMMANDS_PER_LOOP
 
   if (this->touch_sleep_timeout_ != 0) {
-    ESP_LOGCONFIG(TAG, "  Touch Timeout:  %" PRIu32, this->touch_sleep_timeout_);
+    ESP_LOGCONFIG(TAG, "  Touch Timeout:  %" PRIu16, this->touch_sleep_timeout_);
   }
 
   if (this->wake_up_page_ != -1) {
@@ -302,11 +302,11 @@ void Nextion::loop() {
     }
 
     // Check if a startup page has been set and send the command
-    if (this->start_up_page_ != -1) {
+    if (this->start_up_page_ >= 0) {
       this->goto_page(this->start_up_page_);
     }
 
-    if (this->wake_up_page_ != -1) {
+    if (this->wake_up_page_ >= 0) {
       this->set_wake_up_page(this->wake_up_page_);
     }
 
@@ -418,12 +418,12 @@ void Nextion::process_nextion_commands_() {
       ESP_LOGN(TAG, "Add 0xFF");
     }
 
-    this->nextion_event_ = this->command_data_[0];
+    const uint8_t nextion_event = this->command_data_[0];
 
     to_process_length -= 1;
     to_process = this->command_data_.substr(1, to_process_length);
 
-    switch (this->nextion_event_) {
+    switch (nextion_event) {
       case 0x00:  // instruction sent by user has failed
         ESP_LOGW(TAG, "Invalid instruction");
         this->remove_from_q_();
@@ -562,9 +562,9 @@ void Nextion::process_nextion_commands_() {
           break;
         }
 
-        uint16_t x = (uint16_t(to_process[0]) << 8) | to_process[1];
-        uint16_t y = (uint16_t(to_process[2]) << 8) | to_process[3];
-        uint8_t touch_event = to_process[4];  // 0 -> release, 1 -> press
+        const uint16_t x = (uint16_t(to_process[0]) << 8) | to_process[1];
+        const uint16_t y = (uint16_t(to_process[2]) << 8) | to_process[3];
+        const uint8_t touch_event = to_process[4];  // 0 -> release, 1 -> press
         ESP_LOGD(TAG, "Touch %s at %u,%u", touch_event ? "PRESS" : "RELEASE", x, y);
         break;
       }
@@ -820,15 +820,14 @@ void Nextion::process_nextion_commands_() {
         break;
       }
       default:
-        ESP_LOGW(TAG, "Unknown event: 0x%02X", this->nextion_event_);
+        ESP_LOGW(TAG, "Unknown event: 0x%02X", nextion_event);
         break;
     }
 
-    // ESP_LOGN(TAG, "nextion_event_ deleting from 0 to %d", to_process_length + COMMAND_DELIMITER.length() + 1);
     this->command_data_.erase(0, to_process_length + COMMAND_DELIMITER.length() + 1);
   }
 
-  uint32_t ms = App.get_loop_component_start_time();
+  const uint32_t ms = App.get_loop_component_start_time();
 
   if (!this->nextion_queue_.empty() && this->nextion_queue_.front()->queue_time + this->max_q_age_ms_ < ms) {
     for (size_t i = 0; i < this->nextion_queue_.size(); i++) {
@@ -960,7 +959,6 @@ void Nextion::update_components_by_prefix(const std::string &prefix) {
 }
 
 uint16_t Nextion::recv_ret_string_(std::string &response, uint32_t timeout, bool recv_flag) {
-  uint16_t ret = 0;
   uint8_t c = 0;
   uint8_t nr_of_ff_bytes = 0;
   bool exit_flag = false;
@@ -1003,8 +1001,7 @@ uint16_t Nextion::recv_ret_string_(std::string &response, uint32_t timeout, bool
   if (ff_flag)
     response = response.substr(0, response.length() - 3);  // Remove last 3 0xFF
 
-  ret = response.length();
-  return ret;
+  return response.length();
 }
 
 /**

esphome/components/nextion/nextion.h

@@ -1190,11 +1190,11 @@ class Nextion : public NextionBase, public PollingComponent, public uart::UARTDe
    * After 30 seconds the display will go to sleep. Note: the display will only wakeup by a restart or by setting up
    * `thup`.
    */
-  void set_touch_sleep_timeout(uint32_t touch_sleep_timeout);
+  void set_touch_sleep_timeout(uint16_t touch_sleep_timeout);
 
   /**
    * Sets which page Nextion loads when exiting sleep mode. Note this can be set even when Nextion is in sleep mode.
-   * @param wake_up_page The page id, from 0 to the lage page in Nextion. Set 255 (not set to any existing page) to
+   * @param wake_up_page The page id, from 0 to the last page in Nextion. Set -1 (not set to any existing page) to
    * wakes up to current page.
    *
    * Example:
@@ -1204,11 +1204,11 @@ class Nextion : public NextionBase, public PollingComponent, public uart::UARTDe
    *
    * The display will wake up to page 2.
    */
-  void set_wake_up_page(uint8_t wake_up_page = 255);
+  void set_wake_up_page(int16_t wake_up_page = -1);
 
   /**
    * Sets which page Nextion loads when connecting to ESPHome.
-   * @param start_up_page The page id, from 0 to the lage page in Nextion. Set 255 (not set to any existing page) to
+   * @param start_up_page The page id, from 0 to the last page in Nextion. Set -1 (not set to any existing page) to
    * wakes up to current page.
    *
    * Example:
@@ -1218,7 +1218,7 @@ class Nextion : public NextionBase, public PollingComponent, public uart::UARTDe
    *
    * The display will go to page 2 when it establishes a connection to ESPHome.
    */
-  void set_start_up_page(uint8_t start_up_page = 255) { this->start_up_page_ = start_up_page; }
+  void set_start_up_page(int16_t start_up_page = -1) { this->start_up_page_ = start_up_page; }
 
   /**
    * Sets if Nextion should auto-wake from sleep when touch press occurs.
@@ -1330,7 +1330,7 @@ class Nextion : public NextionBase, public PollingComponent, public uart::UARTDe
   std::deque<NextionQueue *> waveform_queue_;
   uint16_t recv_ret_string_(std::string &response, uint32_t timeout, bool recv_flag);
   void all_components_send_state_(bool force_update = false);
-  uint64_t comok_sent_ = 0;
+  uint32_t comok_sent_ = 0;
   bool remove_from_q_(bool report_empty = true);
 
   /**
@@ -1340,12 +1340,10 @@ class Nextion : public NextionBase, public PollingComponent, public uart::UARTDe
   bool ignore_is_setup_ = false;
 
   bool nextion_reports_is_setup_ = false;
-  uint8_t nextion_event_;
-
   void process_nextion_commands_();
   void process_serial_();
   bool is_updating_ = false;
-  uint32_t touch_sleep_timeout_ = 0;
+  uint16_t touch_sleep_timeout_ = 0;
   int16_t wake_up_page_ = -1;
   int16_t start_up_page_ = -1;
   bool auto_wake_on_touch_ = true;

esphome/components/nextion/nextion_commands.cpp

@@ -10,12 +10,12 @@ static const char *const TAG = "nextion";
 // Sleep safe commands
 void Nextion::soft_reset() { this->send_command_("rest"); }
 
-void Nextion::set_wake_up_page(uint8_t wake_up_page) {
+void Nextion::set_wake_up_page(int16_t wake_up_page) {
   this->wake_up_page_ = wake_up_page;
   this->add_no_result_to_queue_with_set_internal_("wake_up_page", "wup", wake_up_page, true);
 }
 
-void Nextion::set_touch_sleep_timeout(uint32_t touch_sleep_timeout) {
+void Nextion::set_touch_sleep_timeout(uint16_t touch_sleep_timeout) {
   if (touch_sleep_timeout < 3) {
     ESP_LOGD(TAG, "Sleep timeout out of bounds (3-65535)");
     return;