119 lines
4.2 KiB
C
119 lines
4.2 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Glenn Ruben Bakke
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include "mphalport.h"
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#include "hal_pwm.h"
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#ifdef HAL_PWM_MODULE_ENABLED
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#define PWM_COUNTER_TOP 16000 // 16MHz divided by 16000-> 1ms
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volatile uint16_t g_pwm_seq[4];
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volatile uint16_t g_pwm_period;
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static const uint32_t hal_pwm_frequency_lookup[] = {
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PWM_PRESCALER_PRESCALER_DIV_1, // 16MHz
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PWM_PRESCALER_PRESCALER_DIV_2, // 8MHz
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PWM_PRESCALER_PRESCALER_DIV_4, // 4MHz
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PWM_PRESCALER_PRESCALER_DIV_8, // 2MHz
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PWM_PRESCALER_PRESCALER_DIV_16, // 1MHz
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PWM_PRESCALER_PRESCALER_DIV_32, // 500kHz
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PWM_PRESCALER_PRESCALER_DIV_64, // 250kHz
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PWM_PRESCALER_PRESCALER_DIV_128 // 125kHz
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};
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void hal_pwm_init(NRF_PWM_Type * p_instance, hal_pwm_init_t const * p_pwm_init) {
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g_pwm_period = p_pwm_init->period;
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uint16_t pulse_width = ((g_pwm_period * p_pwm_init->duty)/100);
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if (p_pwm_init->pulse_width > 0) {
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pulse_width = p_pwm_init->pulse_width;
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}
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if (p_pwm_init->mode == HAL_PWM_MODE_HIGH_LOW) {
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g_pwm_seq[0] = g_pwm_period - pulse_width;
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g_pwm_seq[1] = g_pwm_period - pulse_width;
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} else {
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g_pwm_seq[0] = pulse_width;
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g_pwm_seq[1] = pulse_width;
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}
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g_pwm_seq[2] = 0;
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g_pwm_seq[3] = 0;
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p_instance->PSEL.OUT[0] = (p_pwm_init->pwm_pin << PWM_PSEL_OUT_PIN_Pos)
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| (PWM_PSEL_OUT_CONNECT_Connected << PWM_PSEL_OUT_CONNECT_Pos);
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p_instance->ENABLE = (PWM_ENABLE_ENABLE_Enabled << PWM_ENABLE_ENABLE_Pos);
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p_instance->MODE = (PWM_MODE_UPDOWN_Up << PWM_MODE_UPDOWN_Pos);
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p_instance->PRESCALER = (hal_pwm_frequency_lookup[p_pwm_init->freq] << PWM_PRESCALER_PRESCALER_Pos);
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p_instance->COUNTERTOP = (p_pwm_init->period << PWM_COUNTERTOP_COUNTERTOP_Pos);
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p_instance->LOOP = (PWM_LOOP_CNT_Disabled << PWM_LOOP_CNT_Pos);
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p_instance->DECODER = (PWM_DECODER_LOAD_Individual << PWM_DECODER_LOAD_Pos)
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| (PWM_DECODER_MODE_RefreshCount << PWM_DECODER_MODE_Pos);
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p_instance->SEQ[0].PTR = ((uint32_t)(g_pwm_seq) << PWM_SEQ_PTR_PTR_Pos);
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p_instance->SEQ[0].CNT = ((sizeof(g_pwm_seq) / sizeof(uint16_t)) << PWM_SEQ_CNT_CNT_Pos);
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p_instance->SEQ[0].REFRESH = 0;
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p_instance->SEQ[0].ENDDELAY = 0;
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}
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void hal_pwm_start(NRF_PWM_Type * p_instance) {
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p_instance->TASKS_SEQSTART[0] = 1;
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}
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void hal_pwm_stop(NRF_PWM_Type * p_instance) {
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p_instance->TASKS_SEQSTART[0] = 0;
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p_instance->ENABLE = (PWM_ENABLE_ENABLE_Disabled << PWM_ENABLE_ENABLE_Pos);
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}
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void hal_pwm_freq_set(NRF_PWM_Type * p_instance, uint16_t freq) {
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#if 0
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p_instance->PRESCALER = (hal_pwm_frequency_lookup[freq] << PWM_PRESCALER_PRESCALER_Pos);
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#endif
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}
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void hal_pwm_period_set(NRF_PWM_Type * p_instance, uint16_t period) {
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#if 0
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g_pwm_period = period;
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p_instance->COUNTERTOP = (g_pwm_period << PWM_COUNTERTOP_COUNTERTOP_Pos);
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#endif
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}
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void hal_pwm_duty_set(NRF_PWM_Type * p_instance, uint8_t duty) {
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#if 0
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uint16_t duty_cycle = ((g_pwm_period * duty)/100);
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g_pwm_seq[0] = duty_cycle;
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g_pwm_seq[1] = duty_cycle;
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#endif
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}
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#endif // HAL_PWM_MODULE_ENABLED
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