/* mbed Microcontroller Library
 * Copyright (c) 2006-2020 ARM Limited
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "port_api.h"
#include "pinmap.h"
#include "gpio_api.h"
#include "gpio_addrdefine.h"

PinName port_pin(PortName port, int pin_n) {
    return (PinName)((port * 0x10) + pin_n);
}

void port_init(port_t *obj, PortName port, int mask, PinDirection dir) {
    uint32_t i;

    obj->port = port;
    obj->mask = mask;
    obj->reg_dir = (volatile uint16_t *)PDR(port);
    obj->reg_out = (volatile uint8_t  *)PODR(port);
    obj->reg_in  = (volatile uint8_t  *)PIDR(port);

    // The function is set per pin: reuse gpio logic
    for (i = 0; i < 8; i++) {
        if (obj->mask & (1 << i)) {
            gpio_set(port_pin(obj->port, i));
        }
    }

    port_dir(obj, dir);
}

void port_mode(port_t *obj, PinMode mode) {
    uint32_t i;
    // The mode is set per pin: reuse pinmap logic
    for (i = 0; i < 8; i++) {
        if (obj->mask & (1 << i)) {
            pin_mode(port_pin(obj->port, i), mode);
        }
    }
}

void port_dir(port_t *obj, PinDirection dir) {
    uint32_t i;

    for (i = 0; i < 8; i++) {
        if (obj->mask & (1 << i)) {
            switch (dir) {
                case PIN_INPUT :
                    *obj->reg_dir &= ~((uint16_t)(0x3 << (obj->port * 2)));
                    *obj->reg_dir |= (0x2 << (obj->port * 2));
                    break;
                case PIN_OUTPUT:
                    *obj->reg_dir |= (0x3 << (obj->port * 2));
                    break;
                default:
                    /* do nothing */
                    break;
            }
        }
    }
}

void port_write(port_t *obj, int value) {
    *obj->reg_out = (*obj->reg_in & ~obj->mask) | (value & obj->mask);
}

int port_read(port_t *obj) {
    return (*obj->reg_in & obj->mask);
}