evse_link feature

components/evse_link/include/evse_link_framing.h

@@ -0,0 +1,42 @@
+#ifndef EVSE_LINK_FRAMING_H_
+#define EVSE_LINK_FRAMING_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "driver/uart.h"
+
+// UART configuration
+#define UART_PORT        UART_NUM_2
+#define UART_BAUDRATE    115200
+#define UART_RX_BUF_SIZE 256
+
+// GPIO pin assignments for UART
+#define TX_PIN           21  // GPIO21 -> RX on other board
+#define RX_PIN           22  // GPIO22 -> TX on other board
+
+// Frame delimiters
+#define MAGIC_START           0x7E
+#define MAGIC_END             0x7F
+
+// Maximum payload (excluding sequence byte)
+#define EVSE_LINK_MAX_PAYLOAD 254
+
+// Callback type for when a full frame is received
+typedef void (*evse_link_frame_cb_t)(uint8_t src, uint8_t dest,
+                                     const uint8_t *payload, uint8_t len);
+
+// Initialize framing module (mutex, UART driver, etc.)
+void evse_link_framing_init(void);
+
+// Send a framed payload to `dest` with length `len`
+// Includes source address in the header
+bool evse_link_framing_send(uint8_t dest, uint8_t src,
+                            const uint8_t *payload, uint8_t len);
+
+// Feed a received byte into the framing parser
+void evse_link_framing_recv_byte(uint8_t byte);
+
+// Register a callback for complete frames
+void evse_link_framing_register_cb(evse_link_frame_cb_t cb);
+
+#endif // EVSE_LINK_FRAMING_H_