chore: snapshot before shared RS485 bus integration

components/evse_link/include/evse_link_framing.h

@@ -5,21 +5,36 @@
 #include <stdbool.h>
 #include "driver/uart.h"
 
-// UART instance and configuration
-#define UART_PORT UART_NUM_2
+// UART baud/buffer configuration
 #define UART_BAUDRATE 9600
 #define UART_RX_BUF_SIZE 256
 
-// GPIO pin assignments for RS-485 UART
-// Ajuste conforme seu hardware
-#define MB_UART_TXD 17
-#define MB_UART_RXD 16
-#define MB_UART_RTS 2 // pino DE/RE do transceiver RS-485
+// Select EVSE-Link physical layer at compile time.
+// 0 = production RS485: UART2 GPIO17/16 + RTS/DE GPIO2
+// 1 = emergency/internal UART TTL: UART1 GPIO21/22, no RS485/RTS
+#ifndef EVSE_LINK_USE_UART_TTL
+#define EVSE_LINK_USE_UART_TTL 0
+#endif
 
-#define TX_PIN MB_UART_TXD
-#define RX_PIN MB_UART_RXD
-#define RTS_PIN MB_UART_RTS
+#if EVSE_LINK_USE_UART_TTL
 
+#define UART_PORT UART_NUM_1
+#define TX_PIN 21
+#define RX_PIN 22
+#define RTS_PIN UART_PIN_NO_CHANGE
+#define EVSE_LINK_UART_MODE UART_MODE_UART
+#define EVSE_LINK_PHY_NAME "UART_TTL"
+
+#else
+
+#define UART_PORT UART_NUM_2
+#define TX_PIN 17
+#define RX_PIN 16
+#define RTS_PIN 2
+#define EVSE_LINK_UART_MODE UART_MODE_RS485_HALF_DUPLEX
+#define EVSE_LINK_PHY_NAME "RS485"
+
+#endif
 // Frame delimiters
 #define MAGIC_START 0x7E
 #define MAGIC_END 0x7F