1 /* mbed Microcontroller Library
2 * Copyright (c) 2006-2013 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;
21 static void gpio_enable(void) {
24 /* Enable AHB clock to the GPIO domain. */
25 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
27 /* Peripheral reset control to GPIO and GPIO INT, a "1" bring it out of reset. */
28 LPC_SYSCON->PRESETCTRL &= ~(0x1<<10);
29 LPC_SYSCON->PRESETCTRL |= (0x1<<10);
32 uint32_t gpio_set(PinName pin) {
40 return (1 << ((int)pin & 0x1F));
43 void gpio_init(gpio_t *obj, PinName pin) {
45 if (pin == (PinName)NC)
48 obj->mask = gpio_set(pin);
50 obj->reg_set = &LPC_GPIO_PORT->SET0;
51 obj->reg_clr = &LPC_GPIO_PORT->CLR0;
52 obj->reg_in = &LPC_GPIO_PORT->PIN0;
53 obj->reg_dir = &LPC_GPIO_PORT->DIR0;
56 void gpio_mode(gpio_t *obj, PinMode mode) {
57 pin_mode(obj->pin, mode);
60 void gpio_dir(gpio_t *obj, PinDirection direction) {
61 MBED_ASSERT(obj->pin != (PinName)NC);
64 *obj->reg_dir &= ~obj->mask;
67 *obj->reg_dir |= obj->mask;