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mbed SDK library sources

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Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NXP/TARGET_LPC81X/gpio_api.c@46:bebbbd80dd87, 2013-11-11 (annotated)

Committer:
mbed_official
Date:
Mon Nov 11 13:30:09 2013 +0000
Revision:
46:bebbbd80dd87
Synchronized with git revision b2733e9b9af906952b295cd6abcf916bf79780ab

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 46:bebbbd80dd87 1 /* mbed Microcontroller Library
mbed_official 46:bebbbd80dd87 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 46:bebbbd80dd87 3 *
mbed_official 46:bebbbd80dd87 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 46:bebbbd80dd87 5 * you may not use this file except in compliance with the License.
mbed_official 46:bebbbd80dd87 6 * You may obtain a copy of the License at
mbed_official 46:bebbbd80dd87 7 *
mbed_official 46:bebbbd80dd87 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 46:bebbbd80dd87 9 *
mbed_official 46:bebbbd80dd87 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 46:bebbbd80dd87 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 46:bebbbd80dd87 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 46:bebbbd80dd87 13 * See the License for the specific language governing permissions and
mbed_official 46:bebbbd80dd87 14 * limitations under the License.
mbed_official 46:bebbbd80dd87 15 */
mbed_official 46:bebbbd80dd87 16 #include "gpio_api.h"
mbed_official 46:bebbbd80dd87 17 #include "pinmap.h"
mbed_official 46:bebbbd80dd87 18
mbed_official 46:bebbbd80dd87 19 static int gpio_enabled = 0;
mbed_official 46:bebbbd80dd87 20 static void gpio_enable(void) {
mbed_official 46:bebbbd80dd87 21 gpio_enabled = 1;
mbed_official 46:bebbbd80dd87 22
mbed_official 46:bebbbd80dd87 23 /* Enable AHB clock to the GPIO domain. */
mbed_official 46:bebbbd80dd87 24 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
mbed_official 46:bebbbd80dd87 25
mbed_official 46:bebbbd80dd87 26 /* Peripheral reset control to GPIO and GPIO INT, a "1" bring it out of reset. */
mbed_official 46:bebbbd80dd87 27 LPC_SYSCON->PRESETCTRL &= ~(0x1<<10);
mbed_official 46:bebbbd80dd87 28 LPC_SYSCON->PRESETCTRL |= (0x1<<10);
mbed_official 46:bebbbd80dd87 29 }
mbed_official 46:bebbbd80dd87 30
mbed_official 46:bebbbd80dd87 31 uint32_t gpio_set(PinName pin) {
mbed_official 46:bebbbd80dd87 32 int f = 0;
mbed_official 46:bebbbd80dd87 33
mbed_official 46:bebbbd80dd87 34 if (!gpio_enabled)
mbed_official 46:bebbbd80dd87 35 gpio_enable();
mbed_official 46:bebbbd80dd87 36
mbed_official 46:bebbbd80dd87 37 pin_function(pin, f);
mbed_official 46:bebbbd80dd87 38
mbed_official 46:bebbbd80dd87 39 return (1 << ((int)pin & 0x1F));
mbed_official 46:bebbbd80dd87 40 }
mbed_official 46:bebbbd80dd87 41
mbed_official 46:bebbbd80dd87 42 void gpio_init(gpio_t *obj, PinName pin, PinDirection direction) {
mbed_official 46:bebbbd80dd87 43 if(pin == NC) return;
mbed_official 46:bebbbd80dd87 44
mbed_official 46:bebbbd80dd87 45 obj->pin = pin;
mbed_official 46:bebbbd80dd87 46 obj->mask = gpio_set(pin);
mbed_official 46:bebbbd80dd87 47
mbed_official 46:bebbbd80dd87 48 obj->reg_set = &LPC_GPIO_PORT->SET0;
mbed_official 46:bebbbd80dd87 49 obj->reg_clr = &LPC_GPIO_PORT->CLR0;
mbed_official 46:bebbbd80dd87 50 obj->reg_in = &LPC_GPIO_PORT->PIN0;
mbed_official 46:bebbbd80dd87 51 obj->reg_dir = &LPC_GPIO_PORT->DIR0;
mbed_official 46:bebbbd80dd87 52
mbed_official 46:bebbbd80dd87 53 gpio_dir(obj, direction);
mbed_official 46:bebbbd80dd87 54 switch (direction) {
mbed_official 46:bebbbd80dd87 55 case PIN_OUTPUT: pin_mode(pin, PullNone); break;
mbed_official 46:bebbbd80dd87 56 case PIN_INPUT : pin_mode(pin, PullDown); break;
mbed_official 46:bebbbd80dd87 57 }
mbed_official 46:bebbbd80dd87 58 }
mbed_official 46:bebbbd80dd87 59
mbed_official 46:bebbbd80dd87 60 void gpio_mode(gpio_t *obj, PinMode mode) {
mbed_official 46:bebbbd80dd87 61 pin_mode(obj->pin, mode);
mbed_official 46:bebbbd80dd87 62 }
mbed_official 46:bebbbd80dd87 63
mbed_official 46:bebbbd80dd87 64 void gpio_dir(gpio_t *obj, PinDirection direction) {
mbed_official 46:bebbbd80dd87 65 switch (direction) {
mbed_official 46:bebbbd80dd87 66 case PIN_INPUT : *obj->reg_dir &= ~obj->mask; break;
mbed_official 46:bebbbd80dd87 67 case PIN_OUTPUT: *obj->reg_dir |= obj->mask; break;
mbed_official 46:bebbbd80dd87 68 }
mbed_official 46:bebbbd80dd87 69 }