File content as of revision 181:57724642e740:

/* mbed Microcontroller Library
 * Copyright (c) 2015-2017 Nuvoton
 *
 * 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 "PortNames.h"
#include "mbed_error.h"

/**
 * Configure pin multi-function
 */
void pin_function(PinName pin, int data)
{
    MBED_ASSERT(pin != (PinName)NC);
    uint32_t pin_index = NU_PINNAME_TO_PIN(pin);
    uint32_t port_index = NU_PINNAME_TO_PORT(pin);
    __IO uint32_t *Px_x_MFP = ((__IO uint32_t *) &SYS->PA_L_MFP) + port_index * 2 + (pin_index / 8);
    uint32_t MFP_Msk = NU_MFP_MSK(pin_index);
    
    // E.g.: SYS->PA_L_MFP  = (SYS->PA_L_MFP & (~SYS_PA_L_MFP_PA0_MFP_Msk) ) | SYS_PA_L_MFP_PA0_MFP_SC0_CD  ;
    *Px_x_MFP  = (*Px_x_MFP & (~MFP_Msk)) | data;
}

/**
 * Configure pin pull-up/pull-down
 */
void pin_mode(PinName pin, PinMode mode)
{
    MBED_ASSERT(pin != (PinName)NC);
    uint32_t pin_index = NU_PINNAME_TO_PIN(pin);
    uint32_t port_index = NU_PINNAME_TO_PORT(pin);
    GPIO_T *gpio_base = NU_PORT_BASE(port_index);
    
    uint32_t mode_intern = GPIO_PMD_INPUT;
    
    switch (mode) {
        case PullUp:
            mode_intern = GPIO_PMD_INPUT;
            break;
            
        case PullDown:
        case PullNone:
            // NOTE: Not support
            return;
        
        case PushPull:
            mode_intern = GPIO_PMD_OUTPUT;
            break;
            
        case OpenDrain:
            mode_intern = GPIO_PMD_OPEN_DRAIN;
            break;
            
        case Quasi:
            // NOTE: Not support
            break;
    }
    
    GPIO_SetMode(gpio_base, 1 << pin_index, mode_intern);
}