Tux Leon / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_NXP/TARGET_LPC15XX/gpio_api.c@181:96ed750bd169, 2018-01-17 (annotated)

Committer:
Anna Bridge
Date:
Wed Jan 17 15:23:54 2018 +0000
Revision:
181:96ed750bd169
Parent:
149:156823d33999 
mbed-dev libray. Release version 158

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2014 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
<> 144:ef7eb2e8f9f7 22 static void gpio_enable(void) {
<> 144:ef7eb2e8f9f7 23 gpio_enabled = 1;
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 /* Enable AHB clock to the GPIO0/1/2 and IOCON domain. */
<> 144:ef7eb2e8f9f7 26 LPC_SYSCON->SYSAHBCLKCTRL0 |= (0xFUL << 13);
<> 144:ef7eb2e8f9f7 27 }
<> 144:ef7eb2e8f9f7 28
<> 144:ef7eb2e8f9f7 29 uint32_t gpio_set(PinName pin) {
<> 144:ef7eb2e8f9f7 30 MBED_ASSERT(pin != (PinName)NC);
<> 144:ef7eb2e8f9f7 31 if (!gpio_enabled)
<> 144:ef7eb2e8f9f7 32 gpio_enable();
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 return (1UL << ((int)pin & 0x1f));
<> 144:ef7eb2e8f9f7 35 }
<> 144:ef7eb2e8f9f7 36
<> 144:ef7eb2e8f9f7 37 void gpio_init(gpio_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 38 obj->pin = pin;
<> 144:ef7eb2e8f9f7 39 if (pin == (PinName)NC)
<> 144:ef7eb2e8f9f7 40 return;
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 obj->mask = gpio_set(pin);
<> 144:ef7eb2e8f9f7 43
<> 144:ef7eb2e8f9f7 44 unsigned int port = (unsigned int)(pin >> 5);
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 obj->reg_set = &LPC_GPIO_PORT->SET[port];
<> 144:ef7eb2e8f9f7 47 obj->reg_clr = &LPC_GPIO_PORT->CLR[port];
<> 144:ef7eb2e8f9f7 48 obj->reg_in = &LPC_GPIO_PORT->PIN[port];
<> 144:ef7eb2e8f9f7 49 obj->reg_dir = &LPC_GPIO_PORT->DIR[port];
<> 144:ef7eb2e8f9f7 50 }
<> 144:ef7eb2e8f9f7 51
<> 144:ef7eb2e8f9f7 52 void gpio_mode(gpio_t *obj, PinMode mode) {
<> 144:ef7eb2e8f9f7 53 pin_mode(obj->pin, mode);
<> 144:ef7eb2e8f9f7 54 }
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 void gpio_dir(gpio_t *obj, PinDirection direction) {
<> 144:ef7eb2e8f9f7 57 MBED_ASSERT(obj->pin != (PinName)NC);
<> 144:ef7eb2e8f9f7 58 switch (direction) {
<> 144:ef7eb2e8f9f7 59 case PIN_INPUT :
<> 144:ef7eb2e8f9f7 60 *obj->reg_dir &= ~obj->mask;
<> 144:ef7eb2e8f9f7 61 break;
<> 144:ef7eb2e8f9f7 62 case PIN_OUTPUT:
<> 144:ef7eb2e8f9f7 63 *obj->reg_dir |= obj->mask;
<> 144:ef7eb2e8f9f7 64 break;
<> 144:ef7eb2e8f9f7 65 }
<> 144:ef7eb2e8f9f7 66 }