neorv32/sw/lib/source/neorv32_gptmr.c

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2024-02-24 08:25:27 +00:00
// #################################################################################################
// # << NEORV32: neorv32_gptmr.c - General Purpose Timer (GPTMR) HW Driver >> #
// # ********************************************************************************************* #
// # BSD 3-Clause License #
// # #
// # Copyright (c) 2024, Stephan Nolting. All rights reserved. #
// # #
// # Redistribution and use in source and binary forms, with or without modification, are #
// # permitted provided that the following conditions are met: #
// # #
// # 1. Redistributions of source code must retain the above copyright notice, this list of #
// # conditions and the following disclaimer. #
// # #
// # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
// # conditions and the following disclaimer in the documentation and/or other materials #
// # provided with the distribution. #
// # #
// # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
// # endorse or promote products derived from this software without specific prior written #
// # permission. #
// # #
// # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
// # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
// # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
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// # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
// # OF THE POSSIBILITY OF SUCH DAMAGE. #
// # ********************************************************************************************* #
// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
// #################################################################################################
/**********************************************************************//**
* @file neorv32_gptmr.c
* @brief General purpose timer (GPTMR) HW driver source file.
*
* @note These functions should only be used if the GPTMR unit was synthesized (IO_GPTMR_EN = true).
**************************************************************************/
#include "neorv32.h"
#include "neorv32_gptmr.h"
/**********************************************************************//**
* Check if general purpose timer unit was synthesized.
*
* @return 0 if GPTMR was not synthesized, 1 if GPTMR is available.
**************************************************************************/
int neorv32_gptmr_available(void) {
if (NEORV32_SYSINFO->SOC & (1 << SYSINFO_SOC_IO_GPTMR)) {
return 1;
}
else {
return 0;
}
}
/**********************************************************************//**
* Reset, enable and configure general purpose timer.
*
* @param[in] prsc Clock prescaler select (0..7). See #NEORV32_CLOCK_PRSC_enum.
* @param[in] threshold Threshold value, counter will reset to zero when reaching this.
* @param[in] match_irq Fire interrupt when counter matches threshold value.
**************************************************************************/
void neorv32_gptmr_setup(int prsc, uint32_t threshold, int match_irq) {
NEORV32_GPTMR->CTRL = 0; // reset configuration
NEORV32_GPTMR->THRES = threshold;
NEORV32_GPTMR->COUNT = 0; // reset counter
uint32_t tmp = 0;
tmp |= (uint32_t)(1 & 0x01) << GPTMR_CTRL_EN;
tmp |= (uint32_t)(prsc & 0x07) << GPTMR_CTRL_PRSC0;
tmp |= (uint32_t)(match_irq & 0x01) << GPTMR_CTRL_IRQM;
NEORV32_GPTMR->CTRL = tmp;
}
/**********************************************************************//**
* Configure timer capture feature.
* @note This function needs to be called after the general GPTMR setup #neorv32_gptmr_setup.
*
* @param[in] rising Capture on rising edge.
* @param[in] falling Capture on falling edge.
* @param[in] filter Enable filtering of capture input.
* @param[in] capture_irq Fire interrupt when on capture trigger.
**************************************************************************/
void neorv32_gptmr_capture(int rising, int falling, int filter, int capture_irq) {
uint32_t tmp = NEORV32_GPTMR->CTRL;
tmp |= (uint32_t)(rising & 0x01) << GPTMR_CTRL_RISE;
tmp |= (uint32_t)(falling & 0x01) << GPTMR_CTRL_FALL;
tmp |= (uint32_t)(filter & 0x01) << GPTMR_CTRL_FILTER;
tmp |= (uint32_t)(capture_irq & 0x01) << GPTMR_CTRL_IRQC;
NEORV32_GPTMR->CTRL = tmp;
}
/**********************************************************************//**
* Disable general purpose timer.
**************************************************************************/
void neorv32_gptmr_disable(void) {
NEORV32_GPTMR->CTRL &= ~((uint32_t)(1 << GPTMR_CTRL_EN));
}
/**********************************************************************//**
* Enable general purpose timer.
**************************************************************************/
void neorv32_gptmr_enable(void) {
NEORV32_GPTMR->CTRL |= ((uint32_t)(1 << GPTMR_CTRL_EN));
}
/**********************************************************************//**
* Check if timer match has triggered. Clear trigger flag in that case.
*
* @return 1 if match trigger has fired, 0 if not.
**************************************************************************/
int neorv32_gptmr_trigger_matched(void) {
uint32_t tmp = NEORV32_GPTMR->CTRL;
if (tmp & (1 << GPTMR_CTRL_TRIGM)) {
tmp &= ~((uint32_t)(1 << GPTMR_CTRL_TRIGM));
NEORV32_GPTMR->CTRL = tmp;
return 1;
}
else {
return 0;
}
}
/**********************************************************************//**
* Check if capture input has triggered. Clear trigger flag in that case.
*
* @return 1 if capture trigger has fired, 0 if not.
**************************************************************************/
int neorv32_gptmr_trigger_captured(void) {
uint32_t tmp = NEORV32_GPTMR->CTRL;
if (tmp & (1 << GPTMR_CTRL_TRIGC)) {
tmp &= ~((uint32_t)(1 << GPTMR_CTRL_TRIGC));
NEORV32_GPTMR->CTRL = tmp;
return 1;
}
else {
return 0;
}
}
/**********************************************************************//**
* Reset general purpose timer's counter register (timer-mode only).
**************************************************************************/
void neorv32_gptmr_restart(void) {
NEORV32_GPTMR->COUNT = 0;
}
/**********************************************************************//**
* Get current counter value.
*
* @return Current counter value.
**************************************************************************/
uint32_t neorv32_gptmr_counter_get(void) {
return NEORV32_GPTMR->COUNT;
}
/**********************************************************************//**
* Get latest capture value.
*
* @return Capture timer value.
**************************************************************************/
uint32_t neorv32_gptmr_capture_get(void) {
return NEORV32_GPTMR->CAPTURE;
}