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;
22 static void gpio_enable(void)
26 /* Enable AHB clock to the GPIO domain. */
27 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 6);
29 /* Peripheral reset control to GPIO and GPIO INT, a "1" bring it out of reset. */
30 LPC_SYSCON->PRESETCTRL &= ~(1 << 10);
31 LPC_SYSCON->PRESETCTRL |= (1 << 10);
34 uint32_t gpio_set(PinName pin)
39 return (1 << ((int)pin >> PIN_SHIFT));
42 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)
58 pin_mode(obj->pin, mode);
61 void gpio_dir(gpio_t *obj, PinDirection direction)
63 MBED_ASSERT(obj->pin != (PinName)NC);
66 *obj->reg_dir &= ~obj->mask;
69 *obj->reg_dir |= obj->mask;