Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/TARGET_NXP/TARGET_LPC81X/gpio_api.c@165:2dd56e6daeec, 2017-05-23 (annotated)

Committer:
ranaumarnaeem
Date:
Tue May 23 12:54:50 2017 +0000
Revision:
165:2dd56e6daeec
Parent:
149:156823d33999 
jhjg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 17 #include "gpio_api.h"
<> 144:ef7eb2e8f9f7 18 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 19
<> 144:ef7eb2e8f9f7 20 static int gpio_enabled = 0;
<> 144:ef7eb2e8f9f7 21 static void gpio_enable(void) {
<> 144:ef7eb2e8f9f7 22 gpio_enabled = 1;
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 /* Enable AHB clock to the GPIO domain. */
<> 144:ef7eb2e8f9f7 25 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 /* Peripheral reset control to GPIO and GPIO INT, a "1" bring it out of reset. */
<> 144:ef7eb2e8f9f7 28 LPC_SYSCON->PRESETCTRL &= ~(0x1<<10);
<> 144:ef7eb2e8f9f7 29 LPC_SYSCON->PRESETCTRL |= (0x1<<10);
<> 144:ef7eb2e8f9f7 30 }
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 uint32_t gpio_set(PinName pin) {
<> 144:ef7eb2e8f9f7 33 int f = 0;
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 if (!gpio_enabled)
<> 144:ef7eb2e8f9f7 36 gpio_enable();
<> 144:ef7eb2e8f9f7 37
<> 144:ef7eb2e8f9f7 38 pin_function(pin, f);
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 return (1 << ((int)pin & 0x1F));
<> 144:ef7eb2e8f9f7 41 }
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 void gpio_init(gpio_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 44 obj->pin = pin;
<> 144:ef7eb2e8f9f7 45 if (pin == (PinName)NC)
<> 144:ef7eb2e8f9f7 46 return;
<> 144:ef7eb2e8f9f7 47
<> 144:ef7eb2e8f9f7 48 obj->mask = gpio_set(pin);
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 obj->reg_set = &LPC_GPIO_PORT->SET0;
<> 144:ef7eb2e8f9f7 51 obj->reg_clr = &LPC_GPIO_PORT->CLR0;
<> 144:ef7eb2e8f9f7 52 obj->reg_in = &LPC_GPIO_PORT->PIN0;
<> 144:ef7eb2e8f9f7 53 obj->reg_dir = &LPC_GPIO_PORT->DIR0;
<> 144:ef7eb2e8f9f7 54 }
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 void gpio_mode(gpio_t *obj, PinMode mode) {
<> 144:ef7eb2e8f9f7 57 pin_mode(obj->pin, mode);
<> 144:ef7eb2e8f9f7 58 }
<> 144:ef7eb2e8f9f7 59
<> 144:ef7eb2e8f9f7 60 void gpio_dir(gpio_t *obj, PinDirection direction) {
<> 144:ef7eb2e8f9f7 61 MBED_ASSERT(obj->pin != (PinName)NC);
<> 144:ef7eb2e8f9f7 62 switch (direction) {
<> 144:ef7eb2e8f9f7 63 case PIN_INPUT :
<> 144:ef7eb2e8f9f7 64 *obj->reg_dir &= ~obj->mask;
<> 144:ef7eb2e8f9f7 65 break;
<> 144:ef7eb2e8f9f7 66 case PIN_OUTPUT:
<> 144:ef7eb2e8f9f7 67 *obj->reg_dir |= obj->mask;
<> 144:ef7eb2e8f9f7 68 break;
<> 144:ef7eb2e8f9f7 69 }
<> 144:ef7eb2e8f9f7 70 }