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targets/hal/TARGET_NXP/TARGET_LPC81X/gpio_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 17 #include "gpio_api.h"
bogdanm 0:9b334a45a8ff 18 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 19
bogdanm 0:9b334a45a8ff 20 static int gpio_enabled = 0;
bogdanm 0:9b334a45a8ff 21 static void gpio_enable(void) {
bogdanm 0:9b334a45a8ff 22 gpio_enabled = 1;
bogdanm 0:9b334a45a8ff 23
bogdanm 0:9b334a45a8ff 24 /* Enable AHB clock to the GPIO domain. */
bogdanm 0:9b334a45a8ff 25 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
bogdanm 0:9b334a45a8ff 26
bogdanm 0:9b334a45a8ff 27 /* Peripheral reset control to GPIO and GPIO INT, a "1" bring it out of reset. */
bogdanm 0:9b334a45a8ff 28 LPC_SYSCON->PRESETCTRL &= ~(0x1<<10);
bogdanm 0:9b334a45a8ff 29 LPC_SYSCON->PRESETCTRL |= (0x1<<10);
bogdanm 0:9b334a45a8ff 30 }
bogdanm 0:9b334a45a8ff 31
bogdanm 0:9b334a45a8ff 32 uint32_t gpio_set(PinName pin) {
bogdanm 0:9b334a45a8ff 33 int f = 0;
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 if (!gpio_enabled)
bogdanm 0:9b334a45a8ff 36 gpio_enable();
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38 pin_function(pin, f);
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 return (1 << ((int)pin & 0x1F));
bogdanm 0:9b334a45a8ff 41 }
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 void gpio_init(gpio_t *obj, PinName pin) {
bogdanm 0:9b334a45a8ff 44 obj->pin = pin;
bogdanm 0:9b334a45a8ff 45 if (pin == (PinName)NC)
bogdanm 0:9b334a45a8ff 46 return;
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 obj->mask = gpio_set(pin);
bogdanm 0:9b334a45a8ff 49
bogdanm 0:9b334a45a8ff 50 obj->reg_set = &LPC_GPIO_PORT->SET0;
bogdanm 0:9b334a45a8ff 51 obj->reg_clr = &LPC_GPIO_PORT->CLR0;
bogdanm 0:9b334a45a8ff 52 obj->reg_in = &LPC_GPIO_PORT->PIN0;
bogdanm 0:9b334a45a8ff 53 obj->reg_dir = &LPC_GPIO_PORT->DIR0;
bogdanm 0:9b334a45a8ff 54 }
bogdanm 0:9b334a45a8ff 55
bogdanm 0:9b334a45a8ff 56 void gpio_mode(gpio_t *obj, PinMode mode) {
bogdanm 0:9b334a45a8ff 57 pin_mode(obj->pin, mode);
bogdanm 0:9b334a45a8ff 58 }
bogdanm 0:9b334a45a8ff 59
bogdanm 0:9b334a45a8ff 60 void gpio_dir(gpio_t *obj, PinDirection direction) {
bogdanm 0:9b334a45a8ff 61 MBED_ASSERT(obj->pin != (PinName)NC);
bogdanm 0:9b334a45a8ff 62 switch (direction) {
bogdanm 0:9b334a45a8ff 63 case PIN_INPUT :
bogdanm 0:9b334a45a8ff 64 *obj->reg_dir &= ~obj->mask;
bogdanm 0:9b334a45a8ff 65 break;
bogdanm 0:9b334a45a8ff 66 case PIN_OUTPUT:
bogdanm 0:9b334a45a8ff 67 *obj->reg_dir |= obj->mask;
bogdanm 0:9b334a45a8ff 68 break;
bogdanm 0:9b334a45a8ff 69 }
bogdanm 0:9b334a45a8ff 70 }