diff options
Diffstat (limited to 'libopencm3/lib/sam/common/gpio.c')
| -rw-r--r-- | libopencm3/lib/sam/common/gpio.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/libopencm3/lib/sam/common/gpio.c b/libopencm3/lib/sam/common/gpio.c new file mode 100644 index 0000000..75929f8 --- /dev/null +++ b/libopencm3/lib/sam/common/gpio.c @@ -0,0 +1,64 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2012 Gareth McMullin <gareth@blacksphere.co.nz> + * + * This library is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this library. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <libopencm3/sam/gpio.h> + +void gpio_init(uint32_t port, uint32_t pins, enum gpio_flags flags) +{ + switch (flags & 3) { + case GPIO_FLAG_GPINPUT: + /* input mode doesn't really exist, so we make a high + * output in open-drain mode + */ + PIO_SODR(port) = pins; + flags |= GPIO_FLAG_OPEN_DRAIN; + /* fall through */ + case GPIO_FLAG_GPOUTPUT: + PIO_OER(port) = pins; + PIO_PER(port) = pins; + break; + case GPIO_FLAG_PERIPHA: + PIO_ABSR(port) &= ~pins; + PIO_PDR(port) = pins; + break; + case GPIO_FLAG_PERIPHB: + PIO_ABSR(port) |= pins; + PIO_PDR(port) = pins; + } + + if (flags & GPIO_FLAG_OPEN_DRAIN) { + PIO_MDER(port) = pins; + } else { + PIO_MDDR(port) = pins; + } + + if (flags & GPIO_FLAG_PULL_UP) { + PIO_PUER(port) = pins; + } else { + PIO_PUDR(port) = pins; + } +} + +void gpio_toggle(uint32_t gpioport, uint32_t gpios) +{ + uint32_t odsr = PIO_ODSR(gpioport); + PIO_CODR(gpioport) = odsr & gpios; + PIO_SODR(gpioport) = ~odsr & gpios; +} + |