File content as of revision 189:f392fc9709a3:

/* mbed Microcontroller Library
 * Copyright (c) 2017-2018 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 <arm_cmse.h>
#include "mbed_assert.h"
#include "pinmap.h"
#include "PortNames.h"
#include "mbed_error.h"
#include "partition_M2351.h"
#include "hal_secure.h"

/**
 * Configure pin multi-function
 */
void pin_function(PinName pin, int data)
{
    pin_function_s(pin, 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_MODE_INPUT;

    switch (mode) {
        case InputOnly:
            mode_intern = GPIO_MODE_INPUT;
            break;

        case PushPullOutput:
            mode_intern = GPIO_MODE_OUTPUT;
            break;

        case OpenDrain:
            mode_intern = GPIO_MODE_OPEN_DRAIN;
            break;

        case QuasiBidirectional:
            mode_intern = GPIO_MODE_QUASI;
            break;

        default:
            /* H/W doesn't support separate configuration for input pull mode/direction.
             * We expect upper layer would have translated input pull mode/direction
             * to I/O mode */
            return;
    }

    GPIO_SetMode(gpio_base, 1 << pin_index, mode_intern);

    /* Invalid combinations of PinMode/PinDirection
     *
     * We assume developer would avoid the following combinations of PinMode/PinDirection
     * which are invalid:
     * 1. InputOnly/PIN_OUTPUT
     * 2. PushPullOutput/PIN_INPUT
     */
}

#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
__NONSECURE_ENTRY
void pin_function_s(int32_t pin, int32_t data)
{
    MBED_ASSERT(pin != (PinName)NC);
    uint32_t pin_index = NU_PINNAME_TO_PIN(pin);
    uint32_t port_index = NU_PINNAME_TO_PORT(pin);
    
    /* Guard access to secure GPIO from non-secure domain */
    if (cmse_nonsecure_caller() && 
        (! (SCU_INIT_IONSSET_VAL & (1 << (port_index + 0))))) {
        error("Non-secure domain tries to control secure or undefined GPIO.");
    }

    __IO uint32_t *GPx_MFPx = ((__IO uint32_t *) &SYS->GPA_MFPL) + port_index * 2 + (pin_index / 8);
    uint32_t MFP_Msk = NU_MFP_MSK(pin_index);
    
    // E.g.: SYS->GPA_MFPL  = (SYS->GPA_MFPL & (~SYS_GPA_MFPL_PA0MFP_Msk) ) | SYS_GPA_MFPL_PA0MFP_SC0_CD  ;
    *GPx_MFPx  = (*GPx_MFPx & (~MFP_Msk)) | data;
}
#endif