191 lines
8.3 KiB
C
191 lines
8.3 KiB
C
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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) 2024, 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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* @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 general purpose timer 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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* Reset, enable and configure general purpose 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] threshold Threshold value, counter will reset to zero when reaching this.
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* @param[in] match_irq Fire interrupt when counter matches threshold value.
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**************************************************************************/
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void neorv32_gptmr_setup(int prsc, uint32_t threshold, int match_irq) {
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NEORV32_GPTMR->CTRL = 0; // reset configuration
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NEORV32_GPTMR->THRES = threshold;
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NEORV32_GPTMR->COUNT = 0; // reset counter
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uint32_t tmp = 0;
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tmp |= (uint32_t)(1 & 0x01) << GPTMR_CTRL_EN;
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tmp |= (uint32_t)(prsc & 0x07) << GPTMR_CTRL_PRSC0;
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tmp |= (uint32_t)(match_irq & 0x01) << GPTMR_CTRL_IRQM;
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NEORV32_GPTMR->CTRL = tmp;
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}
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/**********************************************************************//**
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* Configure timer capture feature.
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* @note This function needs to be called after the general GPTMR setup #neorv32_gptmr_setup.
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*
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* @param[in] rising Capture on rising edge.
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* @param[in] falling Capture on falling edge.
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* @param[in] filter Enable filtering of capture input.
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* @param[in] capture_irq Fire interrupt when on capture trigger.
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**************************************************************************/
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void neorv32_gptmr_capture(int rising, int falling, int filter, int capture_irq) {
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uint32_t tmp = NEORV32_GPTMR->CTRL;
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tmp |= (uint32_t)(rising & 0x01) << GPTMR_CTRL_RISE;
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tmp |= (uint32_t)(falling & 0x01) << GPTMR_CTRL_FALL;
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tmp |= (uint32_t)(filter & 0x01) << GPTMR_CTRL_FILTER;
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tmp |= (uint32_t)(capture_irq & 0x01) << GPTMR_CTRL_IRQC;
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NEORV32_GPTMR->CTRL = tmp;
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}
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/**********************************************************************//**
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* Disable general purpose 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 general purpose 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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* Check if timer match has triggered. Clear trigger flag in that case.
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*
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* @return 1 if match trigger has fired, 0 if not.
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**************************************************************************/
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int neorv32_gptmr_trigger_matched(void) {
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uint32_t tmp = NEORV32_GPTMR->CTRL;
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if (tmp & (1 << GPTMR_CTRL_TRIGM)) {
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tmp &= ~((uint32_t)(1 << GPTMR_CTRL_TRIGM));
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NEORV32_GPTMR->CTRL = tmp;
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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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* Check if capture input has triggered. Clear trigger flag in that case.
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*
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* @return 1 if capture trigger has fired, 0 if not.
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**************************************************************************/
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int neorv32_gptmr_trigger_captured(void) {
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uint32_t tmp = NEORV32_GPTMR->CTRL;
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if (tmp & (1 << GPTMR_CTRL_TRIGC)) {
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tmp &= ~((uint32_t)(1 << GPTMR_CTRL_TRIGC));
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NEORV32_GPTMR->CTRL = tmp;
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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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* Reset general purpose timer's counter register (timer-mode only).
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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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/**********************************************************************//**
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* Get current counter value.
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*
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* @return Current counter value.
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**************************************************************************/
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uint32_t neorv32_gptmr_counter_get(void) {
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return NEORV32_GPTMR->COUNT;
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}
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/**********************************************************************//**
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* Get latest capture value.
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*
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* @return Capture timer value.
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**************************************************************************/
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uint32_t neorv32_gptmr_capture_get(void) {
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return NEORV32_GPTMR->CAPTURE;
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}
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