File content as of revision 168:9672193075cf:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2017 ARM Limited
 *
 * 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"

#define MAX_GPIO_PINS  16

PinName port_pin(PortName port, int pin_n)
{
    if (pin_n < 0 || pin_n > MAX_GPIO_PINS) {
        error("Invalid GPIO pin number %d", pin_n);
    }

    return (PinName)((port << PORT_SHIFT) | pin_n);
}

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

    switch (port) {
        case Port0:
            port_reg = (CMSDK_GPIO_TypeDef *)(CMSDK_GPIO0_BASE);
            break;
        case Port1:
            port_reg = (CMSDK_GPIO_TypeDef *)(CMSDK_GPIO1_BASE);
            break;
        case Port2:
            port_reg = (CMSDK_GPIO_TypeDef *)(CMSDK_GPIO2_BASE);
            break;
        case Port3:
            port_reg = (CMSDK_GPIO_TypeDef *)(CMSDK_GPIO3_BASE);
            break;
    }

    obj->port       = port;
    obj->mask       = mask;
    obj->reg_in     = &port_reg->DATAOUT;
    obj->reg_dir    = &port_reg->OUTENABLESET;
    obj->reg_dirclr = &port_reg->OUTENABLECLR;

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

void port_dir(port_t *obj, PinDirection dir)
{
    switch (dir) {
        case PIN_INPUT:
            *obj->reg_dir &= ~obj->mask;
            break;
        case PIN_OUTPUT:
            *obj->reg_dir |= obj->mask;
            break;
    }
}

void port_write(port_t *obj, int value)
{
    *obj->reg_in = value;
}

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