feat(uart): C wrapper to end related Serial object

Author: SuGlider

cores/esp32/HardwareSerial.cpp

@@ -61,6 +61,31 @@ HardwareSerial Serial5(5);
 extern void HWCDCSerialEvent(void) __attribute__((weak));
 #endif
 
+// C-callable helper used by HAL when pins are detached and the high-level
+// HardwareSerial instance must be finalized.
+extern "C" void hal_uart_notify_pins_detached(int uart_num) {
+  log_d("hal_uart_notify_pins_detached: Notifying HardwareSerial for UART%d", uart_num);
+  switch (uart_num) {
+    case UART_NUM_0: Serial0.end(); break;
+#if SOC_UART_NUM > 1
+    case UART_NUM_1: Serial1.end(); break;
+#endif
+#if SOC_UART_NUM > 2
+    case UART_NUM_2: Serial2.end(); break;
+#endif
+#if SOC_UART_NUM > 3
+    case UART_NUM_3: Serial3.end(); break;
+#endif
+#if SOC_UART_NUM > 4
+    case UART_NUM_4: Serial4.end(); break;
+#endif
+#if SOC_UART_NUM > 5
+    case UART_NUM_4: Serial5.end(); break;
+#endif
+    default: break;
+  }
+}
+
 #if USB_SERIAL_IS_DEFINED == 1  // Native USB CDC Event
 // Used by Hardware Serial for USB CDC events
 extern void USBSerialEvent(void) __attribute__((weak));

cores/esp32/esp32-hal-uart.c

@@ -42,6 +42,9 @@
 static int s_uart_debug_nr = 0;         // UART number for debug output
 #define REF_TICK_BAUDRATE_LIMIT 250000  // this is maximum UART badrate using REF_TICK as clock
 
+/* C prototype for the notifier implemented in HardwareSerial.cpp */
+extern void hal_uart_notify_pins_detached(int uart_num);
+
 struct uart_struct_t {
 
 #if !CONFIG_DISABLE_HAL_LOCKS
@@ -293,7 +296,7 @@ static bool _uartDetachBus_RX(void *busptr) {
   }
   if (bus->_txPin < 0) { // both rx and tx pins are detached, terminate the uart driver
     log_d("_uartDetachBus_RX: both RX and TX pins detached for UART%d, terminating driver", bus->num);
-    uartEnd(bus->num);
+    hal_uart_notify_pins_detached(bus->num);
     return true;
   }
   return _uartDetachPins(bus->num, bus->_rxPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
@@ -312,7 +315,7 @@ static bool _uartDetachBus_TX(void *busptr) {
   }
   if (bus->_rxPin < 0) { // both rx and tx pins are detached, terminate the uart driver
     log_d("_uartDetachBus_TX: both RX and TX pins detached for UART%d, terminating driver", bus->num);
-    uartEnd(bus->num);
+    hal_uart_notify_pins_detached(bus->num);
     return true;
   }
   return _uartDetachPins(bus->num, UART_PIN_NO_CHANGE, bus->_txPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);