mbed-os/targets/TARGET_ARM_FM/TARGET_FVP_MPS2/gpio_api.c

/* mbed Microcontroller Library
 * Copyright (c) 2006-2018 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 "gpio_api.h"
#include "pinmap.h"

// function to enable the GPIO pin
uint32_t gpio_set(PinName pin)
{
    return (1);
}

//function to initialise the gpio pin
// this links the board control bits for each pin
// with the object created for the pin
void gpio_init(gpio_t *obj, PinName pin)
{
    if (pin == NC) {
        return;
    } else {
        int pin_value = 0;
        obj->pin = pin;
        if (pin <= 15) {
            pin_value = pin;
        } else if (pin >= 16 && pin <= 31) {
            pin_value = pin - 16;
        } else if (pin >= 32 && pin <= 47) {
            pin_value = pin - 32;
        } else if (pin >= 48 && pin <= 51) {
            pin_value = pin - 48;
        } else if (pin == 100 || pin == 101) {
            pin_value = pin - 100;
        } else if (pin == 110 || pin == 111) {
            pin_value = pin - 110;
        } else if (pin >= 200 && pin <= 207) {
            pin_value = pin - 200;
        } else if (pin >= 210 && pin <= 217) {
            pin_value = pin - 210;
        } else if (pin == 303) {
            pin_value = pin - 302;
        } else if (pin == 307) {
            pin_value = pin - 307;
        } else if (pin == 308) {
            pin_value = pin - 305;
        } else if (pin == 309) {
            pin_value = pin - 305;
        } else if (pin == 310) {
            pin_value = pin - 305;
        } else if (pin == 311) {
            pin_value = pin - 305;
        } else if (pin == 323) {
            pin_value = pin - 315;
        } else if (pin == 334) {
            pin_value = pin - 325;
        } else if (pin == 653) {
            pin_value = pin - 646;
        }

        obj->mask = 0x1 << pin_value;
        obj->pin_number = pin;
        if (pin <= 15) {
            obj->reg_data = &CMSDK_GPIO0->DATAOUT ;
            obj->reg_in  =         &CMSDK_GPIO0->DATA ;
            obj->reg_dir =         &CMSDK_GPIO0->OUTENABLESET ;
            obj->reg_dirclr = &CMSDK_GPIO0->OUTENABLECLR ;
        } else if (pin >= 16 && pin <= 31) {
            obj->reg_data = &CMSDK_GPIO1->DATAOUT ;
            obj->reg_in  =         &CMSDK_GPIO1->DATA ;
            obj->reg_dir =         &CMSDK_GPIO1->OUTENABLESET ;
            obj->reg_dirclr = &CMSDK_GPIO1->OUTENABLECLR ;
        } else if (pin >= 32 && pin <= 47) {
            obj->reg_data = &CMSDK_GPIO2->DATAOUT;
            obj->reg_in  =         &CMSDK_GPIO2->DATA;
            obj->reg_dir =         &CMSDK_GPIO2->OUTENABLESET ;
            obj->reg_dirclr = &CMSDK_GPIO2->OUTENABLECLR ;
        }    else if (pin >= 48 && pin <= 51) {
            obj->reg_data = &CMSDK_GPIO3->DATAOUT;
            obj->reg_in  =         &CMSDK_GPIO3->DATA;
            obj->reg_dir =         &CMSDK_GPIO3->OUTENABLESET ;
            obj->reg_dirclr = &CMSDK_GPIO3->OUTENABLECLR ;
        } else if (pin == 100 || pin == 101) {
            obj->reg_data = &MPS2_FPGAIO->LED; //user leds
            obj->reg_in  =  &MPS2_FPGAIO->LED;
        } else if (pin == 110 || pin == 111) {
            obj->reg_data = &MPS2_FPGAIO->BUTTON; //user switches
            obj->reg_in = &MPS2_FPGAIO->BUTTON; //user switches
        } else if (pin >= 200 && pin <= 207) {
            obj->reg_data = &MPS2_SCC->LEDS; //mcc leds
            obj->reg_in = &MPS2_SCC->LEDS; //mcc leds
        } else if (pin >= 210 && pin <= 217) {
            obj->reg_in = &MPS2_SCC->SWITCHES; //mcc switches
        } else if (pin == 303 || pin == 307) {
            obj->reg_data = &MPS2_FPGAIO->MISC; //spi chip select = 303, clcd chip select = 307
        } else if (pin == 308 || pin == 309 || pin == 310 || pin == 311) {
            obj->reg_data = &MPS2_FPGAIO->MISC; //clcd control bits
        } else if (pin == 323 || pin == 334 || pin == 653) { //spi 3 chip select = 323, spi 4 chip select = 334, adc chip select = 653
            obj->reg_data = &MPS2_FPGAIO->MISC; //spi cs bits
        }

        if (pin == 323) {
            CMSDK_GPIO0->ALTFUNCSET |= 0x1000;
        } else if (pin == 334) {
            CMSDK_GPIO2->ALTFUNCSET |= 0x0040;
        } else if (pin == 653) {
            CMSDK_GPIO1->ALTFUNCSET |= 0x0001;
        }
    }
}

void gpio_mode(gpio_t *obj, PinMode mode)
{
    pin_mode(obj->pin, mode);
}

void gpio_dir(gpio_t *obj, PinDirection direction)
{
    if (obj->pin >= 0 && obj->pin <= 51) {
        switch (direction) {
            case PIN_INPUT :
                *obj->reg_dirclr = obj->mask;
                break;
            case PIN_OUTPUT:
                *obj->reg_dir |= obj->mask;
                break;
        }
    } else {
        return;
    }
}

int gpio_is_connected(const gpio_t *obj)
{
    if (obj->pin != (PinName)NC) {
        return 1;
    } else {
        return 0;
    }
}