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// #################################################################################################
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// # < neo430_pwm.c - PWM controller helper functions > #
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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 NEO430 Processor - https://github.com/stnolting/neo430 #
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// #################################################################################################
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#include "neo430.h"
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#include "neo430_pwm.h"
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/* ------------------------------------------------------------
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* INFO Reset and activate PWM controller
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* PARAM prsc: Clock prescaler for PWM clock
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* PARAM size: 1=use 8-bit counter, 0=use 4-bit counter
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* PARAM gpio_pwm: Use channel 3 for GPIO.output modulation when 1
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* ------------------------------------------------------------ */
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void neo430_pwm_enable(const uint16_t prsc, const uint16_t size, const uint16_t gpio_pwm) {
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PWM_CT = 0; // reset
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PWM_CT = (1<<PWM_CT_EN) | (prsc<<PWM_CT_PRSC0) | (size<<PWM_CT_SIZE_SEL) | (gpio_pwm<<PWM_CT_GPIO_PWM);
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}
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/* ------------------------------------------------------------
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* INFO Disable PWM controller
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* ------------------------------------------------------------ */
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void neo430_pwm_disable(void) {
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PWM_CT = 0;
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}
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/* ------------------------------------------------------------
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* INFO Set duty cycle of channel
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* PARAM channel 0..3
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* PARAM 8-bit duty cycle
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* ------------------------------------------------------------ */
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void neo430_pwm_set(uint8_t channel, uint8_t dc) {
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uint16_t duty_cycle = 0;
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// get current state
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if (channel & 2) // channel 2 or 3
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duty_cycle = PWM_CH32;
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else // channel 1 or 0
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duty_cycle = PWM_CH10;
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// modify high or low part (even or odd channel)
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if (channel & 1) { // channel 1 or 3
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duty_cycle &= 0x00ff;
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duty_cycle |= ((uint16_t)dc) << 8;
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}
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else { // channel 0 or 2
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duty_cycle &= 0xff00;
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duty_cycle |= ((uint16_t)dc) << 0;
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}
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// write back
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if (channel & 2) // channel 2 or 3
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PWM_CH32 = duty_cycle;
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else // channel 1 or 0
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PWM_CH10 = duty_cycle;
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}
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