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// #################################################################################################
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// # << NEORV32: neorv32_gptmr.c - General Purpose Timer (GPTMR) HW Driver >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2021, 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_gptmr.c
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* @author Stephan Nolting
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* @brief General purpose timer (GPTMR) HW driver source file.
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*
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* @note These functions should only be used if the GPTMR unit was synthesized (IO_GPTMR_EN = true).
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**************************************************************************/
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#include "neorv32.h"
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#include "neorv32_gptmr.h"
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/**********************************************************************//**
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* Check if GPTMR unit was synthesized.
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*
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* @return 0 if GPTMR was not synthesized, 1 if GPTMR is available.
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**************************************************************************/
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int neorv32_gptmr_available(void) {
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if (NEORV32_SYSINFO.SOC & (1 << SYSINFO_SOC_IO_GPTMR)) {
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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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* Enable and configure GP timer.
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*
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* @param[in] prsc Clock prescaler select (0..7). See #NEORV32_CLOCK_PRSC_enum.
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* @param[in] mode 0=single-shot mode, 1=continuous mode
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* @param[in] threshold Threshold value to trigger interrupt.
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**************************************************************************/
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void neorv32_gptmr_setup(uint8_t prsc, uint8_t mode, uint32_t threshold) {
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NEORV32_GPTMR.CTRL = 0; // reset control
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NEORV32_GPTMR.THRES = threshold;
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NEORV32_GPTMR.COUNT = 0; // reset counter
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uint32_t ct_enable = 1;
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ct_enable = ct_enable << GPTMR_CTRL_EN;
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uint32_t ct_prsc = (uint32_t)(prsc & 0x07);
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ct_prsc = ct_prsc << GPTMR_CTRL_PRSC0;
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uint32_t ct_mode = (uint32_t)(mode & 0x01);
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ct_mode = ct_mode << GPTMR_CTRL_MODE;
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NEORV32_GPTMR.CTRL = ct_enable | ct_prsc | ct_mode;
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}
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/**********************************************************************//**
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* Disable GP timer.
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**************************************************************************/
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void neorv32_gptmr_disable(void) {
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NEORV32_GPTMR.CTRL &= ~((uint32_t)(1 << GPTMR_CTRL_EN));
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}
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/**********************************************************************//**
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* Enable GP timer.
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**************************************************************************/
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void neorv32_gptmr_enable(void) {
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NEORV32_GPTMR.CTRL |= ((uint32_t)(1 << GPTMR_CTRL_EN));
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}
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/**********************************************************************//**
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* Reset GP timer's counter register.
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**************************************************************************/
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void neorv32_gptmr_restart(void) {
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NEORV32_GPTMR.COUNT = 0;
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}
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