Add GD32 GPIO & USB host headers, remove old HAL

Introduce GD32 GPIO and USB host interfaces and clean up legacy HAL/debug files. Added lib-gd32/include/gpio.h (inline GPIO helpers, enums and wrappers) and lib-gd32/include/device/host/host.h (usb::host enums and accessors). Adjusted lib-gd32/include/gd32_gpio.h by moving GPIO interrupt macros to the common GD32 section. Removed obsolete files in lib-hal: debug/emac/gd32/emac_debug.cpp, include/gd32/hal_gpio.h and include/hal_gpio.h as part of the HAL consolidation/refactor.

Author: vanvught

lib-gd32/include/device/host/host.h

@@ -0,0 +1,43 @@
+/*
+ * host.h
+ */
+
+#ifndef DEVICE_USB_HOSTMSC_H_
+#define DEVICE_USB_HOSTMSC_H_
+
+
+namespace usb::host {
+
+enum class Status {
+	NOT_AVAILABLE,
+	DISCONNECTED,
+	RESET,
+	SPEED_AVAILALBE,
+	ATTACHED,
+	CONNECTED,
+	ENUMERATION_COMPLETED,
+	READY,
+	DEVICE_NOT_SUPPORTED,
+	UNRECOVERABLE_ERROR
+};
+
+enum class Speed {
+	FAULT,
+	LOW,
+	FULL,
+	HIGH
+};
+
+enum class Class {
+	NOT_SUPPORTED,
+	MSC,
+	HID
+};
+
+Status get_status();
+Speed get_speed();
+Class get_class();
+} // namespace usb::host
+
+
+#endif /* DEVICE_USB_HOSTMSC_H_ */

lib-gd32/include/gd32_gpio.h

@@ -37,8 +37,6 @@
 #define GPIO_PULL_UP          GPIO_MODE_IPU
 #define GPIO_PULL_DOWN        GPIO_MODE_IPD
 #define GPIO_PULL_DISABLE     GPIO_MODE_IN_FLOATING
-#define GPIO_INT_CFG_NEG_EDGE EXTI_TRIG_FALLING
-#define GPIO_INT_CFG_BOTH     EXTI_TRIG_BOTH
 #elif defined(GD32F4XX) || defined(GD32H7XX)
 #define GPIO_FSEL_OUTPUT      GPIO_MODE_OUTPUT
 #define GPIO_FSEL_INPUT       GPIO_MODE_INPUT
@@ -47,6 +45,9 @@
 #define GPIO_PULL_DISABLE     GPIO_PUPD_NONE
 #endif
 
+#define GPIO_INT_CFG_NEG_EDGE EXTI_TRIG_FALLING
+#define GPIO_INT_CFG_BOTH     EXTI_TRIG_BOTH
+
 #if defined(GD32F4XX)
 #define GPIOx_OCTL_OFFSET 0x14U;
 #define GPIOx_BOP_OFFSET  0x18U;

lib-gd32/include/gpio.h

@@ -0,0 +1,87 @@
+/**
+ * @file gpio.h
+ * @brief GD32
+ */
+/* Copyright (C) 2026 by Arjan van Vught mailto:info@gd32-dmx.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef GPIO_H_
+#define GPIO_H_
+
+#include <cstdint>
+
+#include "gd32_gpio.h"
+#include "gd32_board.h" // IWYU pragma: keep
+
+namespace gpio {
+enum class Select { 
+  kInput = GPIO_FSEL_INPUT, 
+  kOutput = GPIO_FSEL_OUTPUT 
+};
+
+enum class Pull { 
+  kDisable = GPIO_PULL_DISABLE, 
+  kUp = GPIO_PULL_UP, 
+  kDown = GPIO_PULL_DOWN 
+};
+
+enum class IntConfig {
+//  kPosEdge = 
+//  kNegEdge = 
+  kHighLev = GPIO_INT_CFG_NEG_EDGE,
+//  kLowLev = GPIO_INT_CFG_LOW_LEV,
+  kDoubleEdge = EXTI_TRIG_BOTH  
+};
+
+inline void Fsel(uint32_t gpio, Select fsel) {
+    Gd32GpioFsel(gpio, static_cast<uint32_t>(fsel));
+}
+
+inline void SetPud(uint32_t gpio, Pull pull) {
+    Gd32GpioSetPud(gpio, static_cast<uint32_t>(pull));
+}
+
+inline void IntCfg(uint32_t gpio, IntConfig int_cfg) {
+    Gd32GpioIntCfg(gpio, static_cast<uint32_t>(int_cfg));
+}
+
+inline void Set(uint32_t pin) {
+    Gd32GpioSet(pin);
+}
+
+inline void Clr(uint32_t pin) {
+    Gd32GpioClr(pin);
+}
+
+inline void Write(uint32_t pin, uint32_t value) {
+    if (value != 0) {
+        Set(pin);
+    } else {
+        Clr(pin);
+    }
+}
+
+inline uint8_t Lev(uint32_t pin) {
+    return Gd32GpioLev(pin);
+}
+} // namespace gpio
+
+#endif // GPIO_H_