mirror of
https://github.com/RIOT-OS/RIOT.git
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2a00ec13e5
This commit optimizes the `gpio_conf_t` type in the following regards: - The "base" `gpio_conf_t` is stripped from members that only some platforms support, e.g. drive strength, slew rate, and disabling of the Schmitt Trigger are no longer universally available but platform-specific extensions - The `gpio_conf_t` is now crammed into a bit-field that is 8 bit or 16 bit wide. This allows for storing lots of them e.g. in `driver_foo_params_t` or `uart_conf_t` etc. - A `union` of the `struct` with bit-field members and a `bits` is used to allow accessing all bits in a simple C statement and to ensure alignment for efficient handling of the type Co-authored-by: Gunar Schorcht <gunar@schorcht.net>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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* Copyright (C) 2015 HAW Hamburg
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* 2016 INRIA
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* 2021 Otto-von-Guericke-Universität Magdeburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_atmega_common
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* @ingroup drivers_periph_gpio_ll
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* @{
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*
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* @file
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* @brief Peripheral GPIO Low-Level API implementation for the ATmega GPIO peripheral
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*
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* @author René Herthel <rene-herthel@outlook.de>
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* @author Francisco Acosta <francisco.acosta@inria.fr>
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* @author Laurent Navet <laurent.navet@gmail.com>
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* @author Robert Hartung <hartung@ibr.cs.tu-bs.de>
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* @author Torben Petersen <petersen@ibr.cs.tu-bs.de>
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* @author Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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*
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* @}
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*/
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#include <errno.h>
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#include <string.h>
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#include "cpu.h"
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#include "irq.h"
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#include "periph/gpio_ll.h"
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static void _set_dir(gpio_port_t port, uint8_t pin, bool output)
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{
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atmega_gpio_port_t *p = (void *)port;
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if (output) {
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p->ddr |= 1U << pin;
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}
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else {
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p-> ddr &= ~(1U << pin);
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}
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}
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static bool _is_output(gpio_port_t port, uint8_t pin)
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{
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atmega_gpio_port_t *p = (void *)port;
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return (p->ddr >> pin) & 1U;
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}
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static void _set_pull_config(gpio_port_t port, uint8_t pin, gpio_pull_t pull)
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{
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atmega_gpio_port_t *p = (void *)port;
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p->port |= pull << pin;
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}
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int gpio_ll_init(gpio_port_t port, uint8_t pin, const gpio_conf_t *conf)
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{
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if ((conf->pull > GPIO_PULL_UP)
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|| (conf->state == GPIO_OUTPUT_OPEN_DRAIN)
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|| (conf->state == GPIO_OUTPUT_OPEN_SOURCE)) {
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return -ENOTSUP;
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}
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unsigned state = irq_disable();
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if (conf->initial_value) {
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gpio_ll_set(port, 1UL << pin);
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}
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else {
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gpio_ll_clear(port, 1UL << pin);
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}
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_set_dir(port, pin, conf->state == GPIO_OUTPUT_PUSH_PULL);
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if (conf->state == GPIO_INPUT) {
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_set_pull_config(port, pin, conf->pull);
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}
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irq_restore(state);
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return 0;
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}
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void gpio_ll_query_conf(gpio_conf_t *dest, gpio_port_t port, uint8_t pin)
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{
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assert(dest);
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memset(dest, 0, sizeof(*dest));
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if (_is_output(port, pin)) {
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dest->state = GPIO_OUTPUT_PUSH_PULL;
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dest->initial_value = (gpio_ll_read_output(port) >> pin) & 1U;
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}
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else {
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dest->state = GPIO_INPUT;
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dest->pull = (gpio_ll_read_output(port) >> pin) & 1U;
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dest->initial_value = (gpio_ll_read(port) >> pin) & 1U;
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}
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}
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