163 lines
6.9 KiB
C
163 lines
6.9 KiB
C
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// #################################################################################################
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// # << NEORV32: neorv32_pwm.c - Pulse Width Modulation Controller (PWM) HW Driver >> #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # #
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// # Copyright (c) 2023, 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_pwm.c
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* @brief Pulse-Width Modulation Controller (PWM) HW driver source file.
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*
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* @note These functions should only be used if the PWM unit was synthesized (IO_PWM_EN = true).
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**************************************************************************/
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#include "neorv32.h"
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#include "neorv32_pwm.h"
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/**********************************************************************//**
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* Check if PWM unit was synthesized.
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*
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* @return 0 if PWM was not synthesized, 1 if PWM is available.
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**************************************************************************/
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int neorv32_pwm_available(void) {
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if (NEORV32_SYSINFO->SOC & (1 << SYSINFO_SOC_IO_PWM)) {
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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 pulse width modulation controller.
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* The PWM control register bits are listed in #NEORV32_PWM_CTRL_enum.
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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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**************************************************************************/
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void neorv32_pwm_setup(int prsc) {
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NEORV32_PWM->CTRL = 0; // reset
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uint32_t ct_enable = 1;
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ct_enable = ct_enable << PWM_CTRL_EN;
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uint32_t ct_prsc = (uint32_t)(prsc & 0x07);
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ct_prsc = ct_prsc << PWM_CTRL_PRSC0;
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NEORV32_PWM->CTRL = ct_enable | ct_prsc;
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}
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/**********************************************************************//**
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* Disable pulse width modulation controller.
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**************************************************************************/
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void neorv32_pwm_disable(void) {
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NEORV32_PWM->CTRL &= ~((uint32_t)(1 << PWM_CTRL_EN));
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}
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/**********************************************************************//**
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* Enable pulse width modulation controller.
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**************************************************************************/
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void neorv32_pwm_enable(void) {
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NEORV32_PWM->CTRL |= ((uint32_t)(1 << PWM_CTRL_EN));
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}
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/**********************************************************************//**
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* Get number of implemented channels.
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* @warning This function will override all duty cycle configuration registers.
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*
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* @return Number of implemented channels.
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**************************************************************************/
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int neorv32_pmw_get_num_channels(void) {
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neorv32_pwm_disable();
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int i = 0;
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uint32_t cnt = 0;
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for (i=0; i<12; i++) {
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neorv32_pwm_set(i, 1);
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cnt += neorv32_pwm_get(i);
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}
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return (int)cnt;
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}
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/**********************************************************************//**
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* Set duty cycle for channel.
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*
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* @param[in] channel Channel select (0..11).
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* @param[in] dc Duty cycle (8-bit, LSB-aligned).
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**************************************************************************/
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void neorv32_pwm_set(int channel, uint8_t dc) {
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if (channel > 11) {
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return; // out-of-range
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}
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const uint32_t dc_mask = 0xff;
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uint32_t dc_new = (uint32_t)dc;
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uint32_t tmp = NEORV32_PWM->DC[channel/4];
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tmp &= ~(dc_mask << ((channel % 4) * 8)); // clear previous duty cycle
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tmp |= dc_new << ((channel % 4) * 8); // set new duty cycle
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NEORV32_PWM->DC[channel/4] = tmp;
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}
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/**********************************************************************//**
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* Get duty cycle from channel.
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*
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* @param[in] channel Channel select (0..11).
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* @return Duty cycle (8-bit, LSB-aligned) of channel 'channel'.
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**************************************************************************/
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uint8_t neorv32_pwm_get(int channel) {
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if (channel > 11) {
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return 0; // out of range
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}
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uint32_t rd = NEORV32_PWM->DC[channel/4] >> (((channel % 4) * 8));
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return (uint8_t)rd;
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}
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