File content as of revision 162:16168a1438f3:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 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 "mbed_assert.h"
#include "pinmap.h"
#include "mbed_error.h"


void pin_function(PinName pin, int function)
{
    // do nothing
    return;
}

void pin_mode(PinName pin, PinMode mode)
{
    MBED_ASSERT(pin != (PinName)NC);

    if ((pin == P0_10) || (pin == P0_11)) {
        // True open-drain pins can be configured for different I2C-bus speeds
        return;
    }

    __IO uint32_t *reg = (uint32_t *)(LPC_IOCON_BASE + (pin & 0xFF));

    if (mode == OpenDrain) {
        *reg |= (1 << 10);
    } else {
        uint32_t tmp = *reg;
        tmp &= ~(0x3 << 3);
        tmp |= (mode & 0x3) << 3;
        *reg = tmp;
    }
}