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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Jeff Epler for Adafruit Industries
*
* 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 <stddef.h>
#include "py/mphal.h"
#include "common-hal/rgbmatrix/RGBMatrix.h"
#include "shared-bindings/pwmio/PWMOut.h"
#include "shared-module/rgbmatrix/RGBMatrix.h"
#include "src/rp2_common/hardware_pwm/include/hardware/pwm.h"
#include "src/rp2_common/hardware_irq/include/hardware/irq.h"
void *common_hal_rgbmatrix_timer_allocate(rgbmatrix_rgbmatrix_obj_t *self) {
// Choose a PWM channel based on the first RGB pin
uint8_t slice = pwm_gpio_to_slice_num(self->rgb_pins[0]);
uint8_t channel = pwm_gpio_to_channel(self->rgb_pins[0]);
int result = pwmout_allocate(slice, channel, true, 125000000 / 3);
if (result == PWMOUT_OK) {
// return value must be nonzero (but slice and channel can both be
// zero), so set bit 16...
pwmout_never_reset(slice, channel);
return (void *)(intptr_t)(slice | (channel << 8) | 0x10000);
}
return NULL;
}
void common_hal_rgbmatrix_timer_enable(void *ptr) {
int8_t slice = ((intptr_t)ptr) & 0xff;
pwm_set_enabled(slice, false);
pwm_clear_irq(slice);
pwm_set_enabled(slice, true);
}
void common_hal_rgbmatrix_timer_disable(void *ptr) {
int8_t slice = ((intptr_t)ptr) & 0xff;
pwm_set_enabled(slice, false);
irq_set_enabled(PWM_IRQ_WRAP, false);
pwm_clear_irq(slice);
}
void common_hal_rgbmatrix_timer_free(void *ptr) {
intptr_t value = (intptr_t)ptr;
uint8_t slice = value & 0xff;
uint8_t channel = value >> 8;
pwm_set_enabled(slice, false);
irq_set_enabled(PWM_IRQ_WRAP, false);
pwm_clear_irq(slice);
pwmout_free(slice, channel);
return;
}
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