EL4121 Embedded System / mbed-os

mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

targets/TARGET_NXP/TARGET_LPC81X/gpio_api.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /* mbed Microcontroller Library
be_bryan 0:b74591d5ab33 2 * Copyright (c) 2006-2013 ARM Limited
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Licensed under the Apache License, Version 2.0 (the "License");
be_bryan 0:b74591d5ab33 5 * you may not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 6 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 7 *
be_bryan 0:b74591d5ab33 8 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 9 *
be_bryan 0:b74591d5ab33 10 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 11 * distributed under the License is distributed on an "AS IS" BASIS,
be_bryan 0:b74591d5ab33 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 13 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 14 * limitations under the License.
be_bryan 0:b74591d5ab33 15 */
be_bryan 0:b74591d5ab33 16 #include "mbed_assert.h"
be_bryan 0:b74591d5ab33 17 #include "gpio_api.h"
be_bryan 0:b74591d5ab33 18 #include "pinmap.h"
be_bryan 0:b74591d5ab33 19
be_bryan 0:b74591d5ab33 20 static int gpio_enabled = 0;
be_bryan 0:b74591d5ab33 21 static void gpio_enable(void) {
be_bryan 0:b74591d5ab33 22 gpio_enabled = 1;
be_bryan 0:b74591d5ab33 23
be_bryan 0:b74591d5ab33 24 /* Enable AHB clock to the GPIO domain. */
be_bryan 0:b74591d5ab33 25 LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
be_bryan 0:b74591d5ab33 26
be_bryan 0:b74591d5ab33 27 /* Peripheral reset control to GPIO and GPIO INT, a "1" bring it out of reset. */
be_bryan 0:b74591d5ab33 28 LPC_SYSCON->PRESETCTRL &= ~(0x1<<10);
be_bryan 0:b74591d5ab33 29 LPC_SYSCON->PRESETCTRL |= (0x1<<10);
be_bryan 0:b74591d5ab33 30 }
be_bryan 0:b74591d5ab33 31
be_bryan 0:b74591d5ab33 32 uint32_t gpio_set(PinName pin) {
be_bryan 0:b74591d5ab33 33 int f = 0;
be_bryan 0:b74591d5ab33 34
be_bryan 0:b74591d5ab33 35 if (!gpio_enabled)
be_bryan 0:b74591d5ab33 36 gpio_enable();
be_bryan 0:b74591d5ab33 37
be_bryan 0:b74591d5ab33 38 pin_function(pin, f);
be_bryan 0:b74591d5ab33 39
be_bryan 0:b74591d5ab33 40 return (1 << ((int)pin & 0x1F));
be_bryan 0:b74591d5ab33 41 }
be_bryan 0:b74591d5ab33 42
be_bryan 0:b74591d5ab33 43 void gpio_init(gpio_t *obj, PinName pin) {
be_bryan 0:b74591d5ab33 44 obj->pin = pin;
be_bryan 0:b74591d5ab33 45 if (pin == (PinName)NC)
be_bryan 0:b74591d5ab33 46 return;
be_bryan 0:b74591d5ab33 47
be_bryan 0:b74591d5ab33 48 obj->mask = gpio_set(pin);
be_bryan 0:b74591d5ab33 49
be_bryan 0:b74591d5ab33 50 obj->reg_set = &LPC_GPIO_PORT->SET0;
be_bryan 0:b74591d5ab33 51 obj->reg_clr = &LPC_GPIO_PORT->CLR0;
be_bryan 0:b74591d5ab33 52 obj->reg_in = &LPC_GPIO_PORT->PIN0;
be_bryan 0:b74591d5ab33 53 obj->reg_dir = &LPC_GPIO_PORT->DIR0;
be_bryan 0:b74591d5ab33 54 }
be_bryan 0:b74591d5ab33 55
be_bryan 0:b74591d5ab33 56 void gpio_mode(gpio_t *obj, PinMode mode) {
be_bryan 0:b74591d5ab33 57 pin_mode(obj->pin, mode);
be_bryan 0:b74591d5ab33 58 }
be_bryan 0:b74591d5ab33 59
be_bryan 0:b74591d5ab33 60 void gpio_dir(gpio_t *obj, PinDirection direction) {
be_bryan 0:b74591d5ab33 61 MBED_ASSERT(obj->pin != (PinName)NC);
be_bryan 0:b74591d5ab33 62 switch (direction) {
be_bryan 0:b74591d5ab33 63 case PIN_INPUT :
be_bryan 0:b74591d5ab33 64 *obj->reg_dir &= ~obj->mask;
be_bryan 0:b74591d5ab33 65 break;
be_bryan 0:b74591d5ab33 66 case PIN_OUTPUT:
be_bryan 0:b74591d5ab33 67 *obj->reg_dir |= obj->mask;
be_bryan 0:b74591d5ab33 68 break;
be_bryan 0:b74591d5ab33 69 }
be_bryan 0:b74591d5ab33 70 }