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/*
* 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;
}
}
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