Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_Freescale/TARGET_K20XX/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) 2006-2015 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 uint32_t gpio_set(PinName pin) {
elessair 0:f269e3021894 21 MBED_ASSERT(pin != (PinName)NC);
elessair 0:f269e3021894 22 pin_function(pin, 1);
elessair 0:f269e3021894 23 return 1 << ((pin & 0x7F) >> 2);
elessair 0:f269e3021894 24 }
elessair 0:f269e3021894 25
elessair 0:f269e3021894 26 void gpio_init(gpio_t *obj, PinName pin) {
elessair 0:f269e3021894 27 obj->pin = pin;
elessair 0:f269e3021894 28 if (pin == (PinName)NC)
elessair 0:f269e3021894 29 return;
elessair 0:f269e3021894 30
elessair 0:f269e3021894 31 obj->mask = gpio_set(pin);
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 unsigned int port = (unsigned int)pin >> PORT_SHIFT;
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 GPIO_Type *reg = (GPIO_Type *)(PTA_BASE + port * 0x40);
elessair 0:f269e3021894 36 obj->reg_set = &reg->PSOR;
elessair 0:f269e3021894 37 obj->reg_clr = &reg->PCOR;
elessair 0:f269e3021894 38 obj->reg_in = &reg->PDIR;
elessair 0:f269e3021894 39 obj->reg_dir = &reg->PDDR;
elessair 0:f269e3021894 40 }
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 void gpio_mode(gpio_t *obj, PinMode mode) {
elessair 0:f269e3021894 43 pin_mode(obj->pin, mode);
elessair 0:f269e3021894 44 }
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 void gpio_dir(gpio_t *obj, PinDirection direction) {
elessair 0:f269e3021894 47 MBED_ASSERT(obj->pin != (PinName)NC);
elessair 0:f269e3021894 48 switch (direction) {
elessair 0:f269e3021894 49 case PIN_INPUT :
elessair 0:f269e3021894 50 *obj->reg_dir &= ~obj->mask;
elessair 0:f269e3021894 51 break;
elessair 0:f269e3021894 52 case PIN_OUTPUT:
elessair 0:f269e3021894 53 *obj->reg_dir |= obj->mask;
elessair 0:f269e3021894 54 break;
elessair 0:f269e3021894 55 }
elessair 0:f269e3021894 56 }