127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
/*
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* This file is part of the Micro Python 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 Damien P. George
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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 <stdio.h>
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#include <stdint.h>
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#include "esppwm.h"
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#include "py/runtime.h"
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#include "shared-bindings/pulseio/PWMOut.h"
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#include "eagle_soc.h"
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#include "c_types.h"
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#include "gpio.h"
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#define PWM_FREQ_MAX 1000
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// Shared with pybpwm
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extern bool pwm_inited;
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bool first_channel_variable;
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void pwmout_reset(void) {
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first_channel_variable = false;
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}
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void common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self, const mcu_pin_obj_t* pin, uint16_t duty, uint32_t frequency,
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bool variable_frequency) {
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if (frequency > PWM_FREQ_MAX) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
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"Maximum PWM frequency is %dhz.", PWM_FREQ_MAX));
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} else if (frequency < 1) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError,
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"Minimum PWM frequency is 1hz."));
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}
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// start the PWM subsystem if it's not already running
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if (!pwm_inited) {
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pwm_init();
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pwm_inited = true;
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pwm_set_freq(frequency, 0);
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first_channel_variable = variable_frequency;
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} else if (first_channel_variable || pwm_get_freq(0) != frequency) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
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"Multiple PWM frequencies not supported. PWM already set to %dhz.", pwm_get_freq(0)));
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}
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self->channel = pwm_add(pin->gpio_number,
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pin->peripheral,
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pin->gpio_function);
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self->pin = pin;
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if (self->channel == -1) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
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"PWM not supported on pin %d", pin->gpio_number));
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}
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}
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bool common_hal_pulseio_pwmout_deinited(pulseio_pwmout_obj_t* self) {
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return self->pin == mp_const_none;
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}
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void common_hal_pulseio_pwmout_deinit(pulseio_pwmout_obj_t* self) {
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if (common_hal_pulseio_pwmout_deinited(self)) {
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return;
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}
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pwm_delete(self->channel);
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pwm_start();
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if (self->pin->gpio_number < 16) {
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uint32_t pin_mask = 1 << self->pin->gpio_number;
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gpio_output_set(0x0, 0x0, 0x0, pin_mask);
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PIN_FUNC_SELECT(self->pin->peripheral, 0);
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PIN_PULLUP_DIS(self->pin->peripheral);
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}
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self->pin = mp_const_none;
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}
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void common_hal_pulseio_pwmout_set_duty_cycle(pulseio_pwmout_obj_t* self, uint16_t duty) {
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// We get 16 bits of duty in but the underlying code is only ten bit.
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pwm_set_duty(duty >> 6, self->channel);
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pwm_start();
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}
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uint16_t common_hal_pulseio_pwmout_get_duty_cycle(pulseio_pwmout_obj_t* self) {
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return pwm_get_duty(self->channel) << 6;
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}
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void common_hal_pulseio_pwmout_set_frequency(pulseio_pwmout_obj_t* self, uint32_t frequency) {
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if (frequency > PWM_FREQ_MAX) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
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"Maximum PWM frequency is %dhz.", PWM_FREQ_MAX));
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} else if (frequency < 1) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError,
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"Minimum PWM frequency is 1hz."));
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}
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pwm_set_freq(frequency, 0);
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}
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uint32_t common_hal_pulseio_pwmout_get_frequency(pulseio_pwmout_obj_t* self) {
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return pwm_get_freq(0);
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}
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bool common_hal_pulseio_pwmout_get_variable_frequency(pulseio_pwmout_obj_t* self) {
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return first_channel_variable;
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}
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