Implement Multi-Bus CAN Interfaces

common-libaries/mcp2521_hardware_interface/include/mcp2521_hardware_esp_bus.hpp

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "mcp2521_hardware_esp.hpp"
+
+#include "driver/gpio.h"
+#include "driver/spi_master.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+struct spi_message_t {
+    spi_transaction_t *transaction;
+    QueueHandle_t queue;
+    spi_device_handle_t spi_device_handle;
+};
+
+/**
+ * @brief Hardware handle for MCP2521 over SPI in a multi-Bus-Setup on ESP32 
+ * This should not be created directly, use the MCP2521_HardwareHandleFactory_ESPBus instead
+ */
+class MCP2521_HardwareHandle_ESPBus : public MCP2521_HardwareHandle_ESP {
+    using MCP2521_HardwareHandle_ESP::MCP2521_HardwareHandle_ESP;
+private:
+    QueueHandle_t send_queue;
+    QueueHandle_t receive_queue;
+
+    /**
+     * @brief Wrapper around the spi_transmit function, that locks the spiMutex before calling spi_transmit.
+     * The muxtex is shared with all other MCP2521_HardwareHandle_ESPBus instances created by the same MCP2521_HardwareHandleFactory_ESPBus
+     * @overload
+     * 
+     * @param t ESP32 SPI Transaction struct
+     */
+    void spi_transmit(spi_transaction_t *t);
+public:
+    MCP2521_HardwareHandle_ESPBus(
+        QueueHandle_t send_queue,
+        spi_host_device_t spi_host,
+        spi_bus_config_t * bus_config,
+        gpio_num_t cs, 
+        gpio_num_t int_pin
+    );
+
+    void initPins(
+        gpio_num_t int_pin
+    );
+};