Refractored epd handler

main/display/epd_handler.h

@@ -0,0 +1,41 @@
+#pragma once
+#include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
+#include "driver/spi_master.h"
+#include "common/semaphore_guard.h"
+#include <vector>
+#include "display/transaction_guard.h"
+
+class EPDHandler : public WithTransaction {
+public:
+  EPDHandler();
+  ~EPDHandler();
+  esp_err_t init();
+
+  esp_err_t epd_write_cmd(const uint8_t cmd, uint32_t transaction_id);
+  esp_err_t epd_write_data(const uint8_t data, uint32_t transaction_id);
+  esp_err_t epd_write_cmd_with_data(const uint8_t cmd, std::vector<uint8_t>& data, uint32_t transaction_id);
+  esp_err_t transfer_spi_data(const uint8_t* data, const size_t& length, uint32_t transaction_id);
+
+  bool is_busy(void) const;
+  void wait_for_idle(void) const;
+
+private:
+
+  esp_err_t dangerous_epd_write_cmd_without_lock_(const uint8_t cmd);
+  esp_err_t dangerous_epd_write_data_without_lock_(const uint8_t data);
+
+  esp_err_t begin_transaction_(TickType_t timeout, uint32_t& out_id) override;
+  esp_err_t end_transaction_(void) override;
+  // given a transaction ID, wait for current transaction to complete. The transaction ID will determine if the wait is needed.
+  esp_err_t wait_for_transaction_end_(TickType_t timeout, uint32_t awaiting_transaction_id, SemaphoreGuard& out_transaction_guard);
+
+  spi_device_handle_t spi_ = nullptr;
+
+  SemaphoreHandle_t spi_mutex_ = nullptr;
+  SemaphoreHandle_t spi_transaction_mutex_ = nullptr;
+
+  uint32_t spi_transaction_id = 0; // For tracking SPI transactions
+
+  friend class TransactionGuard;
+};