Import Mbed OS hard-float snapshot

targets/TARGET_GigaDevice/TARGET_GD32F30X/gpio_api.c

@@ -0,0 +1,151 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2018 GigaDevice Semiconductor Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "gd32f30x_gpio.h"
+#include "mbed_assert.h"
+#include "gpio_api.h"
+#include "pinmap.h"
+#include "mbed_error.h"
+
+extern const int GD_GPIO_REMAP[];
+extern const int GD_GPIO_SPEED[];
+extern const int GD_GPIO_MODE[];
+
+/* Enable GPIO clock and return GPIO base address */
+uint32_t gpio_clock_enable(uint32_t port_idx)
+{
+    uint32_t gpio_add = 0;
+    switch (port_idx) {
+        case PORTA:
+            gpio_add = GPIOA;
+            rcu_periph_clock_enable(RCU_GPIOA);
+            break;
+        case PORTB:
+            gpio_add = GPIOB;
+            rcu_periph_clock_enable(RCU_GPIOB);
+            break;
+        case PORTC:
+            gpio_add = GPIOC;
+            rcu_periph_clock_enable(RCU_GPIOC);
+            break;
+        case PORTD:
+            gpio_add = GPIOD;
+            rcu_periph_clock_enable(RCU_GPIOD);
+            break;
+        case PORTE:
+            gpio_add = GPIOE;
+            rcu_periph_clock_enable(RCU_GPIOE);
+            break;
+        default:
+            error("port number not exist");
+            break;
+    }
+    return gpio_add;
+}
+
+/** Set the given pin as GPIO
+ *
+ * @param pin The pin to be set as GPIO
+ * @return The GPIO port mask for this pin
+ */
+uint32_t gpio_set(PinName pin)
+{
+
+    MBED_ASSERT(pin != (PinName)NC);
+    pin_function(pin, MODE_IN_FLOATING);
+    /* return pin mask */
+    return (uint32_t)(1 << ((uint32_t)pin & 0xF));
+}
+
+/** Initialize the GPIO pin
+ *
+ * @param obj The GPIO object to initialize
+ * @param pin The GPIO pin to initialize
+ */
+void gpio_init(gpio_t *obj, PinName pin)
+{
+    obj->pin = pin;
+    if (pin == (PinName)NC) {
+        return;
+    }
+    /* fill struct parameter for future use */
+    uint32_t port_index = GD_PORT_GET(pin);
+    uint32_t gpio = gpio_clock_enable(port_index);
+    obj->mask    = gpio_set(pin);
+    obj->gpio_periph  = gpio;
+}
+
+/** Set the input pin mode
+ *
+ * @param obj  The GPIO object
+ * @param mode The pin mode to be set
+ */
+void gpio_mode(gpio_t *obj, PinMode mode)
+{
+    pin_mode(obj->pin, mode);
+}
+
+/** Set the output value
+ *
+ * @param obj   The GPIO object
+ * @param value The value to be set
+ */
+void gpio_write(gpio_t *obj, int value)
+{
+    /* set or reset GPIO pin */
+    if (value) {
+        GPIO_BOP(obj->gpio_periph) = (1 << (uint32_t)GD_PIN_GET(obj->pin));
+    } else {
+        GPIO_BC(obj->gpio_periph) = (1 << (uint32_t)GD_PIN_GET(obj->pin));
+    }
+}
+
+/** Read the input value
+ *
+ * @param obj The GPIO object
+ * @return An integer value 1 or 0
+ */
+int gpio_read(gpio_t *obj)
+{
+    /* return state of GPIO pin */
+    return ((GPIO_ISTAT(obj->gpio_periph) & obj->mask) ? 1 : 0);
+}
+
+/* Checks if gpio object is connected (pin was not initialized with NC)
+ * @param pin The pin to be set as GPIO
+ * @return 0 if port is initialized with NC
+ **/
+int gpio_is_connected(const gpio_t *obj)
+{
+    return obj->pin != (PinName)NC;
+}
+
+/** Set the pin direction
+ *
+ * @param obj       The GPIO object
+ * @param direction The pin direction to be set
+ */
+void gpio_dir(gpio_t *obj, PinDirection direction)
+{
+
+    /* config GPIO pin as input or output */
+    if (direction == PIN_INPUT) {
+        gpio_para_init(obj->gpio_periph, GD_GPIO_MODE[MODE_IN_FLOATING], GD_GPIO_SPEED[0], (1 << (uint32_t)GD_PIN_GET(obj->pin)));
+    } else {
+        gpio_para_init(obj->gpio_periph, GD_GPIO_MODE[MODE_OUT_PP], GD_GPIO_SPEED[0], (1 << (uint32_t)GD_PIN_GET(obj->pin)));
+    }
+}