Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_NXP/TARGET_LPC15XX/gpio_api.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 * Copyright (c) 2006-2014 ARM Limited
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 5 * you may not use this file except in compliance with the License.
elessair 0:f269e3021894 6 * You may obtain a copy of the License at
elessair 0:f269e3021894 7 *
elessair 0:f269e3021894 8 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 9 *
elessair 0:f269e3021894 10 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 11 * distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 13 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 14 * limitations under the License.
elessair 0:f269e3021894 15 */
elessair 0:f269e3021894 16 #include "mbed_assert.h"
elessair 0:f269e3021894 17 #include "gpio_api.h"
elessair 0:f269e3021894 18 #include "pinmap.h"
elessair 0:f269e3021894 19
elessair 0:f269e3021894 20 static int gpio_enabled = 0;
elessair 0:f269e3021894 21
elessair 0:f269e3021894 22 static void gpio_enable(void) {
elessair 0:f269e3021894 23 gpio_enabled = 1;
elessair 0:f269e3021894 24
elessair 0:f269e3021894 25 /* Enable AHB clock to the GPIO0/1/2 and IOCON domain. */
elessair 0:f269e3021894 26 LPC_SYSCON->SYSAHBCLKCTRL0 |= (0xFUL << 13);
elessair 0:f269e3021894 27 }
elessair 0:f269e3021894 28
elessair 0:f269e3021894 29 uint32_t gpio_set(PinName pin) {
elessair 0:f269e3021894 30 MBED_ASSERT(pin != (PinName)NC);
elessair 0:f269e3021894 31 if (!gpio_enabled)
elessair 0:f269e3021894 32 gpio_enable();
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 return (1UL << ((int)pin & 0x1f));
elessair 0:f269e3021894 35 }
elessair 0:f269e3021894 36
elessair 0:f269e3021894 37 void gpio_init(gpio_t *obj, PinName pin) {
elessair 0:f269e3021894 38 obj->pin = pin;
elessair 0:f269e3021894 39 if (pin == (PinName)NC)
elessair 0:f269e3021894 40 return;
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 obj->mask = gpio_set(pin);
elessair 0:f269e3021894 43
elessair 0:f269e3021894 44 unsigned int port = (unsigned int)(pin >> 5);
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 obj->reg_set = &LPC_GPIO_PORT->SET[port];
elessair 0:f269e3021894 47 obj->reg_clr = &LPC_GPIO_PORT->CLR[port];
elessair 0:f269e3021894 48 obj->reg_in = &LPC_GPIO_PORT->PIN[port];
elessair 0:f269e3021894 49 obj->reg_dir = &LPC_GPIO_PORT->DIR[port];
elessair 0:f269e3021894 50 }
elessair 0:f269e3021894 51
elessair 0:f269e3021894 52 void gpio_mode(gpio_t *obj, PinMode mode) {
elessair 0:f269e3021894 53 pin_mode(obj->pin, mode);
elessair 0:f269e3021894 54 }
elessair 0:f269e3021894 55
elessair 0:f269e3021894 56 void gpio_dir(gpio_t *obj, PinDirection direction) {
elessair 0:f269e3021894 57 MBED_ASSERT(obj->pin != (PinName)NC);
elessair 0:f269e3021894 58 switch (direction) {
elessair 0:f269e3021894 59 case PIN_INPUT :
elessair 0:f269e3021894 60 *obj->reg_dir &= ~obj->mask;
elessair 0:f269e3021894 61 break;
elessair 0:f269e3021894 62 case PIN_OUTPUT:
elessair 0:f269e3021894 63 *obj->reg_dir |= obj->mask;
elessair 0:f269e3021894 64 break;
elessair 0:f269e3021894 65 }
elessair 0:f269e3021894 66 }