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 GPIO and IOCON domain. */
26 LPC_SYSCON->SYSAHBCLKCTRL |= ((1 << 16) | (1 << 6));
29 uint32_t gpio_set(PinName pin) {
30 MBED_ASSERT(pin != (PinName)NC);
34 int func = ((pin == P0_0) || // reset
35 (pin == P0_10) || // SWCLK
36 (pin == P0_12) || // TMS
37 (pin == P0_13) || // TDO
38 (pin == P0_14) || // TRST
39 (pin == P0_15)) ? (1) : (0); // SWDIO
41 pin_function(pin, func);
43 return (1UL << ((int)pin >> PIN_SHIFT & 0x1F));
46 void gpio_init(gpio_t *obj, PinName pin) {
48 if (pin == (PinName)NC)
51 obj->mask = gpio_set(pin);
53 unsigned int port = (unsigned int)(pin >> PORT_SHIFT);
55 obj->reg_set = &LPC_GPIO_PORT->SET[port];
56 obj->reg_clr = &LPC_GPIO_PORT->CLR[port];
57 obj->reg_in = &LPC_GPIO_PORT->PIN[port];
58 obj->reg_dir = &LPC_GPIO_PORT->DIR[port];
61 void gpio_mode(gpio_t *obj, PinMode mode) {
62 pin_mode(obj->pin, mode);
65 void gpio_dir(gpio_t *obj, PinDirection direction) {
66 MBED_ASSERT(obj->pin != (PinName)NC);
69 *obj->reg_dir &= ~obj->mask;
72 *obj->reg_dir |= obj->mask;