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// #################################################################################################
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// # << NEORV32: neorv32_gpio.c - General Purpose Input/Output Port HW Driver (Source) >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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// # #
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// # Redistribution and use in source and binary forms, with or without modification, are #
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// # permitted provided that the following conditions are met: #
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// # #
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// # 1. Redistributions of source code must retain the above copyright notice, this list of #
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// # conditions and the following disclaimer. #
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// # #
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// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
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// # conditions and the following disclaimer in the documentation and/or other materials #
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// # provided with the distribution. #
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// # #
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// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
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// # endorse or promote products derived from this software without specific prior written #
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// # permission. #
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// # #
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// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
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// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
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// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
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// # OF THE POSSIBILITY OF SUCH DAMAGE. #
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// # ********************************************************************************************* #
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// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
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// #################################################################################################
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/**********************************************************************//**
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* @file neorv32_gpio.c
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* @author Stephan Nolting
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* @brief General purpose input/output port unit (GPIO) HW driver source file.
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*
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* @note These functions should only be used if the GPIO unit was synthesized (IO_GPIO_USE = true).
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**************************************************************************/
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#include "neorv32.h"
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#include "neorv32_gpio.h"
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/**********************************************************************//**
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* Check if GPIO unit was synthesized.
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*
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* @return 0 if GPIO was not synthesized, 1 if GPIO is available.
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**************************************************************************/
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int neorv32_gpio_available(void) {
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if (neorv32_cpu_csr_read(CSR_MFEATURES) & (1 << CPU_MFEATURES_IO_GPIO)) {
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return 1;
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}
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else {
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return 0;
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}
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}
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/**********************************************************************//**
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* Set single pin of GPIO's output port.
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*
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* @param[in] pin Pin number to be set (0..15).
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**************************************************************************/
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void neorv32_gpio_pin_set(uint8_t pin) {
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pin &= 0x0f;
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GPIO_OUTPUT = GPIO_OUTPUT | (uint16_t)(1 << pin);
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}
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/**********************************************************************//**
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* Clear single pin of GPIO's output port.
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*
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* @param[in] pin Pin number to be cleared (0..15).
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**************************************************************************/
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void neorv32_gpio_pin_clr(uint8_t pin) {
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pin &= 0x0f;
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GPIO_OUTPUT = GPIO_OUTPUT & ~((uint16_t)(1 << pin));
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}
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/**********************************************************************//**
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* Toggle single pin of GPIO's output port.
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*
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* @param[in] pin Pin number to be toggled (0..15).
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**************************************************************************/
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void neorv32_gpio_pin_toggle(uint8_t pin) {
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pin &= 0x0f;
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GPIO_OUTPUT = GPIO_OUTPUT ^ (uint16_t)(1 << pin);
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}
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/**********************************************************************//**
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* Get single pin of GPIO's input port.
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*
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* @param[in] pin Pin to be read (0..15).
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* @return uint16_t: =0 if pin is low, !=0 if pin is high.
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**************************************************************************/
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uint16_t neorv32_gpio_pin_get(uint8_t pin) {
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pin &= 0x0f;
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return GPIO_INPUT & (uint16_t)(1 << pin);
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}
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/**********************************************************************//**
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* Set complete GPIO output port.
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*
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* @param[in] port_data New port value.
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**************************************************************************/
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void neorv32_gpio_port_set(uint16_t port_data) {
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GPIO_OUTPUT = port_data;
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}
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/**********************************************************************//**
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* Get complete GPIO input port.
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*
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* @return Current input port state.
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**************************************************************************/
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uint16_t neorv32_gpio_port_get(void) {
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return GPIO_INPUT;
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}
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