mirror of https://github.com/ARMmbed/mbed-os.git
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2015 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "gpio_api.h"
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#include "pinmap.h"
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// function to enable the GPIO pin
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uint32_t gpio_set(PinName pin) {
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uint32_t pin_value = 0;
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if(pin <= 15) {
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pin_value = pin;
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} else if (pin >= 16 && pin <= 31) {
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pin_value = pin-16;
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} else if (pin >= 1001 && pin <= 1004) {
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/* Emulated LEDs */
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return (1);
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}
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pin_function(pin, 0);
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return (1 << pin_value);
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}
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//function to initialise the gpio pin
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// this links the board control bits for each pin
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// with the object created for the pin
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void gpio_init(gpio_t *obj, PinName pin) {
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if (pin == NC) {
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return;
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} else {
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int pin_value = 0;
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obj->pin = pin;
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if (pin <=15) {
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pin_value = pin;
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} else if (pin >= 16 && pin <= 31) {
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pin_value = pin-16;
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} else if (pin >= 1001 && pin <= 1004) {
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/* Emulated LEDs */
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return;
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}
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obj->mask = 0x1 << pin_value;
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obj->pin_number = pin;
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if (pin <=15) {
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obj->reg_data = &CMSDK_GPIO0->DATAOUT;
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obj->reg_in = &CMSDK_GPIO0->DATA;
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obj->reg_dir = &CMSDK_GPIO0->OUTENABLESET;
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obj->reg_dirclr = &CMSDK_GPIO0->OUTENABLECLR;
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} else if (pin >= 16 && pin <= 31) {
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obj->reg_data = &CMSDK_GPIO1->DATAOUT;
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obj->reg_in = &CMSDK_GPIO1->DATA;
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obj->reg_dir = &CMSDK_GPIO1->OUTENABLESET;
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obj->reg_dirclr = &CMSDK_GPIO1->OUTENABLECLR;
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}
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}
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}
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void gpio_mode(gpio_t *obj, PinMode mode) {
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pin_mode(obj->pin, mode);
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}
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void gpio_dir(gpio_t *obj, PinDirection direction) {
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if(obj->pin >= 0 && obj->pin <= 31) {
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switch (direction) {
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case PIN_INPUT : *obj->reg_dirclr = obj->mask; break;
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case PIN_OUTPUT: *obj->reg_dir |= obj->mask; break;
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}
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} else {
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return;
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}
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}
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int gpio_is_connected(const gpio_t *obj){
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if(obj->pin != (PinName)NC){
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return 1;
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} else {
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return 0;
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}
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}
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