93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Basic GPIO handling API.
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*
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* Examples:
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* gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
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* GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
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* gpio_set(GPIOB, GPIO4);
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* gpio_clear(GPIOG, GPIO2 | GPIO9);
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* gpio_get(GPIOC, GPIO1);
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* gpio_toggle(GPIOA, GPIO7);
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* reg16 = gpio_port_read(GPIOD);
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* gpio_port_write(GPIOF, 0xc8fe);
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*
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* TODO:
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* - GPIO remapping support
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*/
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#include <libopenstm32.h>
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void gpio_set_mode(u32 gpioport, u8 mode, u8 cnf, u16 gpios)
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{
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u16 i, movingbit = 1, offset = 0;
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u32 crl = 0, crh = 0;
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for (i = 0; i < 16; i++) {
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if ((movingbit & gpios) != movingbit) {
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movingbit <<= 1;
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continue;
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}
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offset = (i < 8) ? (i * 4) : ((i - 8) * 4);
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if (i < 8)
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crl |= (mode << offset) | (cnf << (offset + 2));
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else
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crh |= (mode << offset) | (cnf << (offset + 2));
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}
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GPIO_CRL(gpioport) = crl;
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GPIO_CRH(gpioport) = crh;
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}
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void gpio_set(u32 gpioport, u16 gpios)
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{
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GPIO_BSRR(gpioport) = gpios;
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}
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void gpio_clear(u32 gpioport, u16 gpios)
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{
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GPIO_BRR(gpioport) = gpios;
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}
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u16 gpio_get(u32 gpioport, u16 gpios)
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{
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return gpio_port_read(gpioport) & gpios;
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}
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/* TODO: Should work for multiple GPIOs? */
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void gpio_toggle(u32 gpioport, u16 gpio)
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{
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if ((gpio_port_read(gpioport) & gpio) == gpio)
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gpio_clear(gpioport, gpio);
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else
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gpio_set(gpioport, gpio);
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}
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u16 gpio_port_read(u32 gpioport)
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{
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return (u16)GPIO_IDR(gpioport);
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}
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void gpio_port_write(u32 gpioport, u16 data)
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{
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GPIO_ODR(gpioport) = data;
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}
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