78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/*
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* Copyright (c) 2015 Eric Holland
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <debug.h>
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#include <assert.h>
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#include <dev/gpio.h>
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#include <platform/nrf51.h>
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#include <platform/gpio.h>
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int gpio_config(unsigned nr, unsigned flags)
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{
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DEBUG_ASSERT(nr <= NRF_MAX_PIN_NUMBER);
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unsigned init;
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if (flags & GPIO_OUTPUT) {
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NRF_GPIO->PIN_CNF[nr] = GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos | \
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GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos | \
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GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos | \
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GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos;
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} else { // GPIO_INPUT
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if (flags & GPIO_PULLUP) {
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init = GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos;
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} else if (flags & GPIO_PULLDOWN) {
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init = GPIO_PIN_CNF_PULL_Pulldown << GPIO_PIN_CNF_PULL_Pos;
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} else {
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init = GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos;
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}
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NRF_GPIO->PIN_CNF[nr] = GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos | \
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GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos | \
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init;
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}
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return 0;
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}
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void gpio_set(unsigned nr, unsigned on)
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{
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DEBUG_ASSERT(nr <= NRF_MAX_PIN_NUMBER);
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if (on > 0) {
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NRF_GPIO->OUTSET = 1 << nr;
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} else {
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NRF_GPIO->OUTCLR = 1 << nr;
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}
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}
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int gpio_get(unsigned nr)
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{
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DEBUG_ASSERT( nr <= NRF_MAX_PIN_NUMBER );
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if ( NRF_GPIO->IN & ( 1 << nr) ) {
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return 1;
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} else {
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return 0;
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}
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}
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