Import Mbed OS hard-float snapshot

targets/TARGET_GigaDevice/TARGET_GD32F30X/port_api.c

@@ -0,0 +1,120 @@
+/* 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 "port_api.h"
+#include "pinmap.h"
+#include "gpio_api.h"
+#include "mbed_error.h"
+
+#if DEVICE_PORTIN || DEVICE_PORTOUT
+
+extern uint32_t gpio_clock_enable(uint32_t port_idx);
+
+/** Get the pin name from the port's pin number
+ *
+ * @param port  The port name
+ * @param pin_n The pin number within the specified port
+ * @return The pin name for the port's pin number
+ * BIT[7:4] port number
+   BIT[3:0] pin number
+ */
+PinName port_pin(PortName port, int pin_n)
+{
+    return (PinName)(pin_n + (port << 4));
+}
+
+/** Initilize the port
+ *
+ * @param obj  The port object to initialize
+ * @param port The port name
+ * @param mask The bitmask to identify which bits in the port should be included (0 - ignore)
+ * @param dir  The port direction
+ */
+void port_init(port_t *obj, PortName port, int mask, PinDirection dir)
+{
+    uint32_t port_index = (uint32_t)port;
+    uint32_t gpio =  gpio_clock_enable(port_index);
+
+    obj->port      = port;
+    obj->mask      = mask;
+    obj->direction = dir;
+    obj->reg_in    = &GPIO_ISTAT(gpio);
+    obj->reg_out   = &GPIO_OCTL(gpio);
+
+    port_dir(obj, dir);
+}
+
+/** Set port direction (in/out)
+ *
+ * @param obj The port object
+ * @param dir The port direction to be set
+ */
+void port_dir(port_t *obj, PinDirection dir)
+{
+    uint32_t i;
+    obj->direction = dir;
+    for (i = 0; i < 16; i++) {
+        if (obj->mask & (1 << i)) {
+            if (dir == PIN_OUTPUT) {
+                pin_function(port_pin(obj->port, i), MODE_OUT_PP);
+            } else {
+                pin_function(port_pin(obj->port, i), MODE_IN_FLOATING);
+            }
+        }
+    }
+}
+
+/** Set the input port mode
+ *
+ * @param obj  The port object
+ * @param mode THe port mode to be set
+ */
+void port_mode(port_t *obj, PinMode mode)
+{
+    uint32_t i;
+    for (i = 0; i < 16; i++) {
+        if (obj->mask & (1 << i)) {
+            pin_mode(port_pin(obj->port, i), mode);
+        }
+    }
+}
+
+/** Write value to the port
+ *
+ * @param obj   The port object
+ * @param value The value to be set
+ */
+void port_write(port_t *obj, int value)
+{
+    *obj->reg_out = (*obj->reg_out & ~obj->mask) | (value & obj->mask);
+}
+
+/** Read the current value on the port
+ *
+ * @param obj The port object
+ * @return An integer with each bit corresponding to an associated port pin setting
+ */
+int port_read(port_t *obj)
+{
+    if (obj->direction == PIN_OUTPUT) {
+        return (*obj->reg_out & obj->mask);
+    } else {
+        return (*obj->reg_in & obj->mask);
+    }
+}
+
+#endif