1 /* mbed Microcontroller Library
2 * Copyright (c) 2006-2014 ARM Limited
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 #include "mbed_assert.h"
20 static int gpio_enabled = 0;
22 static void gpio_enable(void) {
25 /* Enable AHB clock to the GPIO0/1/2 and IOCON domain. */
26 LPC_SYSCON->SYSAHBCLKCTRL0 |= (0xFUL << 13);
29 uint32_t gpio_set(PinName pin) {
30 MBED_ASSERT(pin != (PinName)NC);
34 return (1UL << ((int)pin & 0x1f));
37 void gpio_init(gpio_t *obj, PinName pin) {
39 if (pin == (PinName)NC)
42 obj->mask = gpio_set(pin);
44 unsigned int port = (unsigned int)(pin >> 5);
46 obj->reg_set = &LPC_GPIO_PORT->SET[port];
47 obj->reg_clr = &LPC_GPIO_PORT->CLR[port];
48 obj->reg_in = &LPC_GPIO_PORT->PIN[port];
49 obj->reg_dir = &LPC_GPIO_PORT->DIR[port];
52 void gpio_mode(gpio_t *obj, PinMode mode) {
53 pin_mode(obj->pin, mode);
56 void gpio_dir(gpio_t *obj, PinDirection direction) {
57 MBED_ASSERT(obj->pin != (PinName)NC);
60 *obj->reg_dir &= ~obj->mask;
63 *obj->reg_dir |= obj->mask;