circuitpython/ports/esp8266/common-hal/pulseio/PWMOut.c

128 lines
4.5 KiB
C

/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <stdint.h>
#include "esppwm.h"
#include "py/runtime.h"
#include "shared-bindings/pulseio/PWMOut.h"
#include "supervisor/shared/translate.h"
#include "eagle_soc.h"
#include "c_types.h"
#include "gpio.h"
#define PWM_FREQ_MAX 1000
// Shared with pybpwm
extern bool pwm_inited;
bool first_channel_variable;
void pwmout_reset(void) {
first_channel_variable = false;
}
void common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self, const mcu_pin_obj_t* pin, uint16_t duty, uint32_t frequency,
bool variable_frequency) {
if (frequency > PWM_FREQ_MAX) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
translate("Maximum PWM frequency is %dhz."), PWM_FREQ_MAX));
} else if (frequency < 1) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError,
translate("Minimum PWM frequency is 1hz.")));
}
// start the PWM subsystem if it's not already running
if (!pwm_inited) {
pwm_init();
pwm_inited = true;
pwm_set_freq(frequency, 0);
first_channel_variable = variable_frequency;
} else if (first_channel_variable || pwm_get_freq(0) != frequency) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
translate("Multiple PWM frequencies not supported. PWM already set to %dhz."), pwm_get_freq(0)));
}
self->channel = pwm_add(pin->gpio_number,
pin->peripheral,
pin->gpio_function);
self->pin = pin;
if (self->channel == -1) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
translate("PWM not supported on pin %d"), pin->gpio_number));
}
}
bool common_hal_pulseio_pwmout_deinited(pulseio_pwmout_obj_t* self) {
return self->pin == mp_const_none;
}
void common_hal_pulseio_pwmout_deinit(pulseio_pwmout_obj_t* self) {
if (common_hal_pulseio_pwmout_deinited(self)) {
return;
}
pwm_delete(self->channel);
pwm_start();
if (self->pin->gpio_number < 16) {
uint32_t pin_mask = 1 << self->pin->gpio_number;
gpio_output_set(0x0, 0x0, 0x0, pin_mask);
PIN_FUNC_SELECT(self->pin->peripheral, 0);
PIN_PULLUP_DIS(self->pin->peripheral);
}
self->pin = mp_const_none;
}
void common_hal_pulseio_pwmout_set_duty_cycle(pulseio_pwmout_obj_t* self, uint16_t duty) {
// We get 16 bits of duty in but the underlying code is only ten bit.
pwm_set_duty(duty >> 6, self->channel);
pwm_start();
}
uint16_t common_hal_pulseio_pwmout_get_duty_cycle(pulseio_pwmout_obj_t* self) {
return pwm_get_duty(self->channel) << 6;
}
void common_hal_pulseio_pwmout_set_frequency(pulseio_pwmout_obj_t* self, uint32_t frequency) {
if (frequency > PWM_FREQ_MAX) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_OSError,
translate("Maximum PWM frequency is %dhz."), PWM_FREQ_MAX));
} else if (frequency < 1) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError,
translate("Minimum PWM frequency is 1hz.")));
}
pwm_set_freq(frequency, 0);
}
uint32_t common_hal_pulseio_pwmout_get_frequency(pulseio_pwmout_obj_t* self) {
return pwm_get_freq(0);
}
bool common_hal_pulseio_pwmout_get_variable_frequency(pulseio_pwmout_obj_t* self) {
return first_channel_variable;
}