[STM32F0:GPIO] File renamed to meet the content
This commit is contained in:
BuFran
committed by
Piotr Esden-Tempski
Piotr Esden-Tempski
parent
fc02aa6162
commit
eb7d29e115
206
lib/stm32/common/gpio_common_f0234.c
Normal file
206
lib/stm32/common/gpio_common_f0234.c
Normal file
@@ -0,0 +1,206 @@
|
||||
/** @addtogroup gpio_file
|
||||
|
||||
@author @htmlonly © @endhtmlonly 2009
|
||||
Uwe Hermann <uwe@hermann-uwe.de>
|
||||
@author @htmlonly © @endhtmlonly 2012
|
||||
Ken Sarkies <ksarkies@internode.on.net>
|
||||
|
||||
Each I/O port has 16 individually configurable bits. Many I/O pins share GPIO
|
||||
functionality with a number of alternate functions and must be configured to
|
||||
the alternate function mode if these are to be accessed. A feature is available
|
||||
to remap alternative functions to a limited set of alternative pins in the
|
||||
event of a clash of requirements.
|
||||
|
||||
The data registers associated with each port for input and output are 32 bit
|
||||
with the upper 16 bits unused. The output buffer must be written as a 32 bit
|
||||
word, but individual bits may be set or reset separately in atomic operations
|
||||
to avoid race conditions during interrupts. Bits may also be individually
|
||||
locked to prevent accidental configuration changes. Once locked the
|
||||
configuration cannot be changed until after the next reset.
|
||||
|
||||
Each port bit can be configured as analog or digital input, the latter can be
|
||||
floating or pulled up or down. As outputs they can be configured as either
|
||||
push-pull or open drain, digital I/O or alternate function, and with maximum
|
||||
output speeds of 2MHz, 10MHz, or 50MHz.
|
||||
|
||||
On reset all ports are configured as digital floating input.
|
||||
|
||||
@section gpio_api_ex Basic GPIO Handling API.
|
||||
|
||||
Example 1: Push-pull digital output actions with pullup on ports C2 and C9
|
||||
|
||||
@code
|
||||
gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT,
|
||||
GPIO_PUPD_PULLUP, GPIO2 | GPIO9);
|
||||
gpio_output_options(GPIOC, GPIO_OTYPE_PP,
|
||||
GPIO_OSPEED_25MHZ, GPIO2 | GPIO9);
|
||||
gpio_set(GPIOC, GPIO2 | GPIO9);
|
||||
gpio_clear(GPIOC, GPIO2);
|
||||
gpio_toggle(GPIOC, GPIO2 | GPIO9);
|
||||
gpio_port_write(GPIOC, 0x204);
|
||||
@endcode
|
||||
|
||||
Example 2: Digital input on port C12 with pullup
|
||||
|
||||
@code
|
||||
gpio_mode_setup(GPIOC, GPIO_MODE_INPUT,
|
||||
GPIO_PUPD_PULLUP, GPIO12);
|
||||
reg16 = gpio_port_read(GPIOC);
|
||||
@endcode
|
||||
|
||||
*/
|
||||
/*
|
||||
* This file is part of the libopencm3 project.
|
||||
*
|
||||
* Copyright (C) 2011 Fergus Noble <fergusnoble@gmail.com>
|
||||
*
|
||||
* 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/stm32/gpio.h>
|
||||
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/** @brief Set GPIO Pin Mode
|
||||
|
||||
Sets the Pin Direction and Analog/Digital Mode, and Output Pin Pullup,
|
||||
for a set of GPIO pins on a given GPIO port.
|
||||
|
||||
@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
|
||||
@param[in] mode Unsigned int8. Pin mode @ref gpio_mode
|
||||
@param[in] pull_up_down Unsigned int8. Pin pullup/pulldown configuration @ref
|
||||
gpio_pup
|
||||
@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
|
||||
If multiple pins are to be set, use bitwise OR '|' to separate
|
||||
them.
|
||||
*/
|
||||
void gpio_mode_setup(uint32_t gpioport, uint8_t mode, uint8_t pull_up_down,
|
||||
uint16_t gpios)
|
||||
{
|
||||
uint16_t i;
|
||||
uint32_t moder, pupd;
|
||||
|
||||
/*
|
||||
* We want to set the config only for the pins mentioned in gpios,
|
||||
* but keeping the others, so read out the actual config first.
|
||||
*/
|
||||
moder = GPIO_MODER(gpioport);
|
||||
pupd = GPIO_PUPDR(gpioport);
|
||||
|
||||
for (i = 0; i < 16; i++) {
|
||||
if (!((1 << i) & gpios)) {
|
||||
continue;
|
||||
}
|
||||
|
||||
moder &= ~GPIO_MODE_MASK(i);
|
||||
moder |= GPIO_MODE(i, mode);
|
||||
pupd &= ~GPIO_PUPD_MASK(i);
|
||||
pupd |= GPIO_PUPD(i, pull_up_down);
|
||||
}
|
||||
|
||||
/* Set mode and pull up/down control registers. */
|
||||
GPIO_MODER(gpioport) = moder;
|
||||
GPIO_PUPDR(gpioport) = pupd;
|
||||
}
|
||||
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/** @brief Set GPIO Output Options
|
||||
|
||||
When the pin is set to output mode, this sets the configuration (analog/digital
|
||||
and open drain/push pull) and speed, for a set of GPIO pins on a given GPIO
|
||||
port.
|
||||
|
||||
@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
|
||||
@param[in] otype Unsigned int8. Pin output type @ref gpio_output_type
|
||||
@param[in] speed Unsigned int8. Pin speed @ref gpio_speed
|
||||
@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
|
||||
If multiple pins are to be set, use bitwise OR '|' to separate
|
||||
them.
|
||||
*/
|
||||
void gpio_set_output_options(uint32_t gpioport, uint8_t otype, uint8_t speed,
|
||||
uint16_t gpios)
|
||||
{
|
||||
uint16_t i;
|
||||
uint32_t ospeedr;
|
||||
|
||||
if (otype == 0x1) {
|
||||
GPIO_OTYPER(gpioport) |= gpios;
|
||||
} else {
|
||||
GPIO_OTYPER(gpioport) &= ~gpios;
|
||||
}
|
||||
|
||||
ospeedr = GPIO_OSPEEDR(gpioport);
|
||||
|
||||
for (i = 0; i < 16; i++) {
|
||||
if (!((1 << i) & gpios)) {
|
||||
continue;
|
||||
}
|
||||
ospeedr &= ~GPIO_OSPEED_MASK(i);
|
||||
ospeedr |= GPIO_OSPEED(i, speed);
|
||||
}
|
||||
|
||||
GPIO_OSPEEDR(gpioport) = ospeedr;
|
||||
}
|
||||
|
||||
/*---------------------------------------------------------------------------*/
|
||||
/** @brief Set GPIO Alternate Function Selection
|
||||
|
||||
Set the alternate function mapping number for each pin. Most pins have
|
||||
alternate functions associated with them. When set to AF mode, a pin may be
|
||||
used for one of its allocated alternate functions selected by the number given
|
||||
here. To determine the number to be used for the desired function refer to the
|
||||
individual datasheet for the particular device. A table is given under the Pin
|
||||
Selection chapter.
|
||||
|
||||
Note that a number of pins may be set but only with a single AF number. In
|
||||
practice this would rarely be useful as each pin is likely to require a
|
||||
different number.
|
||||
|
||||
@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
|
||||
@param[in] alt_func_num Unsigned int8. Pin alternate function number @ref
|
||||
gpio_af_num
|
||||
@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
|
||||
If multiple pins are to be set, use bitwise OR '|' to separate
|
||||
them.
|
||||
*/
|
||||
void gpio_set_af(uint32_t gpioport, uint8_t alt_func_num, uint16_t gpios)
|
||||
{
|
||||
uint16_t i;
|
||||
uint32_t afrl, afrh;
|
||||
|
||||
afrl = GPIO_AFRL(gpioport);
|
||||
afrh = GPIO_AFRH(gpioport);
|
||||
|
||||
for (i = 0; i < 8; i++) {
|
||||
if (!((1 << i) & gpios)) {
|
||||
continue;
|
||||
}
|
||||
afrl &= ~GPIO_AFR_MASK(i);
|
||||
afrl |= GPIO_AFR(i, alt_func_num);
|
||||
}
|
||||
|
||||
for (i = 8; i < 16; i++) {
|
||||
if (!((1 << i) & gpios)) {
|
||||
continue;
|
||||
}
|
||||
afrh &= ~GPIO_AFR_MASK(i - 8);
|
||||
afrh |= GPIO_AFR(i - 8, alt_func_num);
|
||||
}
|
||||
|
||||
GPIO_AFRL(gpioport) = afrl;
|
||||
GPIO_AFRH(gpioport) = afrh;
|
||||
}
|
||||
/**@}*/
|
||||
|
||||
Reference in New Issue
Block a user