rebase and fix
This commit is contained in:
Ken Sarkies
139
lib/stm32/common/gpio_common_all.c
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139
lib/stm32/common/gpio_common_all.c
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/** @addtogroup gpio_file */
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/*
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* This file is part of the libopencm3 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 library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define WEAK __attribute__ ((weak))
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#include <libopencm3/stm32/gpio.h>
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/**@{*/
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/*-----------------------------------------------------------------------------*/
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/** @brief Set a Group of Pins Atomic
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Set one or more pins of the given GPIO port to 1 in an atomic operation.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
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If multiple pins are to be changed, use logical OR '|' to separate them.
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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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/*-----------------------------------------------------------------------------*/
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/** @brief Clear a Group of Pins Atomic
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Clear one or more pins of the given GPIO port to 0 in an atomic operation.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
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If multiple pins are to be changed, use logical OR '|' to separate them.
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*/
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void gpio_clear(u32 gpioport, u16 gpios)
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{
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GPIO_BSRR(gpioport) = (gpios << 16);
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}
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/*-----------------------------------------------------------------------------*/
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/** @brief Read a Group of Pins.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
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If multiple pins are to be read, use logical OR '|' to separate them.
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@return Unsigned int16 value of the pin values. The bit position of the pin value
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returned corresponds to the pin number.
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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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/*-----------------------------------------------------------------------------*/
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/** @brief Toggle a Group of Pins
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Toggle one or more pins of the given GPIO port. This is not an atomic operation.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
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If multiple pins are to be changed, use logical OR '|' to separate them.
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*/
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void gpio_toggle(u32 gpioport, u16 gpios)
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{
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GPIO_ODR(gpioport) ^= gpios;
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}
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/*-----------------------------------------------------------------------------*/
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/** @brief Read from a Port
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Read the current value of the given GPIO port. Only the lower 16 bits contain
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valid pin data.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@return Unsigned int16. The value held in the specified GPIO port.
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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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/*-----------------------------------------------------------------------------*/
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/** @brief Write to a Port
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Write a value to the given GPIO port.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@param[in] data Unsigned int16. The value to be written to the GPIO port.
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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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/*-----------------------------------------------------------------------------*/
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/** @brief Lock the Configuration of a Group of Pins
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The configuration of one or more pins of the given GPIO port is locked. There is
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no mechanism to unlock these via software. Unlocking occurs at the next reset.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
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If multiple pins are to be locked, use logical OR '|' to separate them.
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*/
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void gpio_port_config_lock(u32 gpioport, u16 gpios)
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{
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u32 reg32;
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/* Special "Lock Key Writing Sequence", see datasheet. */
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GPIO_LCKR(gpioport) = GPIO_LCKK | gpios; /* Set LCKK. */
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GPIO_LCKR(gpioport) = ~GPIO_LCKK & gpios; /* Clear LCKK. */
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GPIO_LCKR(gpioport) = GPIO_LCKK | gpios; /* Set LCKK. */
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reg32 = GPIO_LCKR(gpioport); /* Read LCKK. */
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reg32 = GPIO_LCKR(gpioport); /* Read LCKK again. */
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/* Tell the compiler the variable is actually used. It will get optimized out anyways. */
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reg32 = reg32;
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/* If (reg32 & GPIO_LCKK) is true, the lock is now active. */
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}
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/**@}*/
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195
lib/stm32/common/gpio_common_f24.c
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195
lib/stm32/common/gpio_common_f24.c
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@@ -0,0 +1,195 @@
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/** @addtogroup gpio_file
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@version 1.0.0
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@author @htmlonly © @endhtmlonly 2009 Uwe Hermann <uwe@hermann-uwe.de>
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@author @htmlonly © @endhtmlonly 2012 Ken Sarkies <ksarkies@internode.on.net>
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@date 18 August 2012
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Each I/O port has 16 individually configurable bits. Many I/O pins share GPIO
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functionality with a number of alternate functions and must be configured to the
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alternate function mode if these are to be accessed. A feature is available to
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remap alternative functions to a limited set of alternative pins in the event
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of a clash of requirements.
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The data registers associated with each port for input and output are 32 bit with
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the upper 16 bits unused. The output buffer must be written as a 32 bit word, but
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individual bits may be set or reset separately in atomic operations to avoid race
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conditions during interrupts. Bits may also be individually locked to prevent
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accidental configuration changes. Once locked the configuration cannot be changed
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until after the next reset.
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Each port bit can be configured as analog or digital input, the latter can be
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floating or pulled up or down. As outputs they can be configured as either
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push-pull or open drain, digital I/O or alternate function, and with maximum
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output speeds of 2MHz, 10MHz, or 50MHz.
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On reset all ports are configured as digital floating input.
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@section gpio_api_ex Basic GPIO Handling API.
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Example 1: Push-pull digital output actions on ports C2 and C9
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@code
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gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT,
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GPIO_PUPD_PULLUP, GPIO2 | GPIO9);
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gpio_output_options((GPIOC, GPIO_OTYPE_PP,
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GPIO_OSPEED_25MHZ, GPIO2 | GPIO9);
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gpio_set(GPIOC, GPIO2 | GPIO9);
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gpio_clear(GPIOC, GPIO2);
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gpio_toggle(GPIOC, GPIO2 | GPIO9);
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gpio_port_write(GPIOC, 0x204);
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@endcode
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Example 1: Digital input on port C12
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@code
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gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT,
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GPIO_PUPD_PULLUP, GPIO12);
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reg16 = gpio_port_read(GPIOC);
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@endcode
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LGPL License Terms @ref lgpl_license
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2011 Fergus Noble <fergusnoble@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**@{*/
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#include <libopencm3/stm32/common/gpio_common_all.h>
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#include <libopencm3/stm32/gpio.h>
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/*-----------------------------------------------------------------------------*/
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/** @brief Set GPIO Pin Mode
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Sets the Pin Direction and Analog/Digital Mode, and Output Pin Pullup,
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for a set of GPIO pins on a given GPIO port.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@param[in] mode Unsigned int8. Pin mode @ref gpio_mode
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@param[in] pull_up_down Unsigned int8. Pin pullup/pulldown configuration @ref gpio_pup
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@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
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If multiple pins are to be set, use logical OR '|' to separate them.
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*/
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void gpio_mode_setup(u32 gpioport, u8 mode, u8 pull_up_down, u16 gpios)
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{
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u16 i;
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u32 moder, pupd;
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/*
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* We want to set the config only for the pins mentioned in gpios,
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* but keeping the others, so read out the actual config first.
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*/
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moder = GPIO_MODER(gpioport);
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pupd = GPIO_PUPDR(gpioport);
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for (i = 0; i < 16; i++) {
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if (!((1 << i) & gpios))
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continue;
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moder &= ~GPIO_MODE_MASK(i);
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moder |= GPIO_MODE(i, mode);
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pupd &= ~GPIO_PUPD_MASK(i);
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pupd |= GPIO_PUPD(i, pull_up_down);
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}
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/* Set mode and pull up/down control registers. */
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GPIO_MODER(gpioport) = moder;
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GPIO_PUPDR(gpioport) = pupd;
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}
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/*-----------------------------------------------------------------------------*/
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/** @brief Set GPIO Output Options
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When the pin is set to output mode, this sets the configuration (analog/digital and
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open drain/push pull) and speed, for a set of GPIO pins on a given GPIO port.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@param[in] otype Unsigned int8. Pin output type @ref gpio_output_type
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@param[in] speed Unsigned int8. Pin speed @ref gpio_speed
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@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
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If multiple pins are to be set, use logical OR '|' to separate them.
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*/
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void gpio_set_output_options(u32 gpioport, u8 otype, u8 speed, u16 gpios)
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{
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u16 i;
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u32 ospeedr;
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if (otype == 0x1)
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GPIO_OTYPER(gpioport) |= gpios;
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else
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GPIO_OTYPER(gpioport) &= ~gpios;
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ospeedr = GPIO_OSPEEDR(gpioport);
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for (i = 0; i < 16; i++) {
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if (!((1 << i) & gpios))
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continue;
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ospeedr &= ~GPIO_OSPEED_MASK(i);
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ospeedr |= GPIO_OSPEED(i, speed);
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}
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GPIO_OSPEEDR(gpioport) = ospeedr;
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}
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/*-----------------------------------------------------------------------------*/
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/** @brief Set GPIO Alternate Function Selection
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Set the alternate function mapping number for each pin. Most pins have alternate
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functions associated with them. When set to AF mode, a pin may be used for one of
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its allocated alternate functions selected by the number given here. To determine
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the number to be used for the desired function refer to the individual datasheet
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for the particular device. A table is given under the Pin Selection chapter.
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Note that a number of pins may be set but only with a single AF number. In practice
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this would rarely be useful as each pin is likely to require a different number.
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@param[in] gpioport Unsigned int32. Port identifier @ref gpio_port_id
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@param[in] alt_func_num Unsigned int8. Pin alternate function number @ref gpio_af_num
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@param[in] gpios Unsigned int16. Pin identifiers @ref gpio_pin_id
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If multiple pins are to be set, use logical OR '|' to separate them.
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*/
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void gpio_set_af(u32 gpioport, u8 alt_func_num, u16 gpios)
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{
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u16 i;
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u32 afrl, afrh;
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afrl = GPIO_AFRL(gpioport);
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afrh = GPIO_AFRH(gpioport);
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for (i = 0; i < 8; i++) {
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if (!((1 << i) & gpios))
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continue;
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afrl &= ~GPIO_AFR_MASK(i);
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afrl |= GPIO_AFR(i, alt_func_num);
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}
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for (i = 8; i < 16; i++) {
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if (!((1 << i) & gpios))
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continue;
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afrl &= ~GPIO_AFR_MASK(i - 8);
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afrh |= GPIO_AFR(i - 8, alt_func_num);
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}
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GPIO_AFRL(gpioport) = afrl;
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GPIO_AFRH(gpioport) = afrh;
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}
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/**@}*/
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