vf6xx: initial GPIO support
This adds GPIO module support. GPIO can be controlled using the GPIO number as stated in the reference manual, similar to Linux. Also 32-bit access to whole ports is possible. Reading a GPIO is possible without muxing the pad as GPIO, however writing a GPIO needs the pad to be muxed as GPIO.
This commit is contained in:
Stefan Agner
Frantisek Burian
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a1d456521d
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2e1cbcae22
80
include/libopencm3/vf6xx/gpio.h
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80
include/libopencm3/vf6xx/gpio.h
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@ -0,0 +1,80 @@
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/** @defgroup VF6xx_gpio_defines GPIO Defines
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*
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* @brief <b>Defined Constants and Types for the VF6xx GPIO Module</b>
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*
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* @ingroup VF6xx_defines
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*
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* @version 1.0.0
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*
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* @author @htmlonly © @endhtmlonly 2014
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* Stefan Agner <stefan@agner.ch>
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*
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* @date 03 July 2014
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*
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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) 2014 Stefan Agner <stefan@agner.ch>
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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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#ifndef LIBOPENCM3_VF6XX_GPIO_H
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#define LIBOPENCM3_VF6XX_GPIO_H
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#include <libopencm3/cm3/common.h>
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#include <libopencm3/vf6xx/memorymap.h>
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/* --- Convenience macros -------------------------------------------------- */
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/****************************************************************************/
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/** @defgroup gpio_reg_base GPIO register base addresses
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@ingroup VF6xx_gpio_defines
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@{*/
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#define GPIO(port) (GPIO_BASE + (0x040 * (port)))
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#define GPIO0 (GPIO_BASE + 0x000)
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#define GPIO1 (GPIO_BASE + 0x040)
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#define GPIO2 (GPIO_BASE + 0x080)
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#define GPIO3 (GPIO_BASE + 0x0C0)
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#define GPIO4 (GPIO_BASE + 0x100)
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#define GPIO_OFFSET(gpio) (0x1 << (gpio % 32))
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/* --- GPIO registers ------------------------------------------------------ */
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#define GPIO_PDOR(gpio_base) MMIO32(gpio_base + 0x00)
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#define GPIO_PSOR(gpio_base) MMIO32(gpio_base + 0x04)
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#define GPIO_PCOR(gpio_base) MMIO32(gpio_base + 0x08)
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#define GPIO_PTOR(gpio_base) MMIO32(gpio_base + 0x0C)
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#define GPIO_PDIR(gpio_base) MMIO32(gpio_base + 0x10)
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/* --- Function prototypes ------------------------------------------------- */
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#include <libopencm3/cm3/common.h>
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BEGIN_DECLS
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void gpio_set(uint32_t gpio);
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void gpio_clear(uint32_t gpio);
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bool gpio_get(uint32_t gpio);
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void gpio_toggle(uint32_t gpio);
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uint32_t gpio_port_read(uint32_t gpioport);
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void gpio_port_write(uint32_t gpioport, uint32_t data);
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END_DECLS
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#endif
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@ -52,4 +52,7 @@
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#define UART4_BASE (PERIPH_BASE_AIPS1 + 0x29000)
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#define UART5_BASE (PERIPH_BASE_AIPS1 + 0x2A000)
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/* GPIO module */
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#define GPIO_BASE (PERIPH_BASE + 0xff000)
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#endif
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@ -34,7 +34,7 @@ CFLAGS = -Os -g \
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-mcpu=cortex-m4 -mthumb $(FP_FLAGS) -Wstrict-prototypes \
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-ffunction-sections -fdata-sections -MD -DVF6XX
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ARFLAGS = rcs
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OBJS = ccm.o uart.o
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OBJS = ccm.o uart.o gpio.o
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VPATH += ../cm3
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131
lib/vf6xx/gpio.c
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131
lib/vf6xx/gpio.c
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/** @defgroup VF6xx_gpio GPIO
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*
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* @ingroup VF6xx
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*
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* @section vf6xx_gpio_api_ex GPIO API.
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*
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* @brief <b>VF6xx General-Purpose Input/Output (GPIO)</b>
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*
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* @author @htmlonly © @endhtmlonly 2014 Stefan Agner <stefan@agner.ch>
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*
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* @date 03 July 2014
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*
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* This library supports the GPIO module in the VF6xx SoC of Freescale.
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* Access is provided by GPIO number according to the Pinmux list of the
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* Reference Manual, similar as GPIOs are available on Linux.
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*
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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) 2014 Stefan Agner <stefan@agner.ch>
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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/vf6xx/gpio.h>
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#include <libopencm3/vf6xx/ccm.h>
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/*---------------------------------------------------------------------------*/
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/** @brief Set GPIO
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Set GPIO by GPIO number according to MUX list
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@param[in] gpio unsigned 32 bit. GPIO number
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*/
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void gpio_set(uint32_t gpio)
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{
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uint32_t port = GPIO(gpio / 32);
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GPIO_PSOR(port) = GPIO_OFFSET(gpio);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Set GPIO
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Clears GPIO by GPIO number according to MUX list
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@param[in] gpio unsigned 32 bit. GPIO number
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*/
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void gpio_clear(uint32_t gpio)
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{
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uint32_t port = GPIO(gpio / 32);
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GPIO_PCOR(port) = GPIO_OFFSET(gpio);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Get GPIOs logic state
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Get logic level of GPIO given by GPIO number according to MUX list. Reading
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a GPIO value is possible even if the port is not muxed for GPIO.
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@param[in] gpio unsigned 32 bit. GPIO number
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@returns the logic state of the given GPIO.
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*/
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bool gpio_get(uint32_t gpio)
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{
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uint32_t port = GPIO(gpio / 32);
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return !!(GPIO_PDIR(port) & GPIO_OFFSET(gpio));
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Toggles GPIO
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Toggles GPIO by GPIO number according to MUX list
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@param[in] gpio unsigned 32 bit. GPIO number
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*/
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void gpio_toggle(uint32_t gpio)
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{
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uint32_t port = GPIO(gpio / 32);
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GPIO_PTOR(port) = GPIO_OFFSET(gpio);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Read a whole GPIO Port
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Gets all 32 GPIOs of a Port.
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@param[in] gpioport unsigned 32 bit. GPIO port @ref gpio_reg_base
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@returns the logic states of the given GPIO port.
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*/
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uint32_t gpio_port_read(uint32_t gpioport)
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{
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return GPIO_PDIR(gpioport);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Write a whole GPIO Port
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Sets all 32 GPIOs of a Port.
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@param[in] gpioport unsigned 32 bit. GPIO port @ref gpio_reg_base
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@param[in] gpio unsigned 32 bit. 1 for a logic 1 driven at port, 0 for a logic
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0 driven at port.
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*/
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void gpio_port_write(uint32_t gpioport, uint32_t data)
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{
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GPIO_PDOR(gpioport) = data;
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}
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/**@}*/
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