src/bsp/lk/platform/nrf51xxx/gpio.c

/*
 * Copyright (c) 2015 Eric Holland
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include <debug.h>
#include <assert.h>
#include <dev/gpio.h>
#include <platform/nrf51.h>
#include <platform/gpio.h>

int gpio_config(unsigned nr, unsigned flags)
{
    DEBUG_ASSERT(nr <= NRF_MAX_PIN_NUMBER);

    unsigned init;

    if (flags & GPIO_OUTPUT) {

            NRF_GPIO->PIN_CNF[nr] = GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos     | \
                                    GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos  | \
                                    GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos   | \
                                    GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos;
    } else { // GPIO_INPUT
		if (flags & GPIO_PULLUP) {
            init    =   GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos;
        } else if (flags & GPIO_PULLDOWN) {
            init    =   GPIO_PIN_CNF_PULL_Pulldown << GPIO_PIN_CNF_PULL_Pos;
		} else {
            init    =   GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos;
		}
        NRF_GPIO->PIN_CNF[nr] = GPIO_PIN_CNF_DIR_Input      <<  GPIO_PIN_CNF_DIR_Pos    | \
                                GPIO_PIN_CNF_INPUT_Connect  <<  GPIO_PIN_CNF_INPUT_Pos  | \
                                init;
	}
	return 0;
}

void gpio_set(unsigned nr, unsigned on)
{
        DEBUG_ASSERT(nr <= NRF_MAX_PIN_NUMBER);

        if (on > 0) {
            NRF_GPIO->OUTSET = 1 << nr;
        } else {
            NRF_GPIO->OUTCLR = 1 << nr;
        }
}

int gpio_get(unsigned nr)
{
        DEBUG_ASSERT( nr <= NRF_MAX_PIN_NUMBER );

        if ( NRF_GPIO->IN & ( 1 << nr) ) {
               return 1;
         } else {
               return 0;
         }
}