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https://github.com/licsber/micropython.git
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d693758ab2
Features are:
- 3 to 5 different frequency groups.
- Freq range of 1Hz - 24 MHz.
- Duty rate stays stable on freq change.
Keyword options to the PWM constructor:
- device=n Select a specific PWM device. If no device is specified, a free
device is chosen, if available at that pin.
- freq=nnnn
- duty_u16=nnnn
- duty_ns=nnnn
- invert=True/False Allowing two outputs on the same device/channel to have
complementary signals.
If both freq and duty are provided, PWM output will start immediately.
Pins at the same device have the same frequency. If the PWM output number
exceeds the number of channels at the PWM device, the effctive channel_no
is output_no % channel_count. So with a channel count of 4, output 7 is
assigned to channel 3. Pins at a certain channel have the same frequency
and duty rate, but may be seperately inverted.
140 lines
4.2 KiB
C
140 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) 2019-2021 Damien P. George
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* Copyright (c) 2022 Robert Hammelrath
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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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#ifndef MICROPY_INCLUDED_SAMD_MPHALPORT_H
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#define MICROPY_INCLUDED_SAMD_MPHALPORT_H
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#include "py/mpconfig.h"
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// ASF4
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#include "hal_gpio.h"
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#include "hpl_time_measure.h"
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#include "sam.h"
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extern int mp_interrupt_char;
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extern volatile uint32_t systick_ms;
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extern volatile uint32_t systick_ms_upper;
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void mp_hal_set_interrupt_char(int c);
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#define mp_hal_delay_us_fast mp_hal_delay_us
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static inline mp_uint_t mp_hal_ticks_ms(void) {
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return systick_ms;
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}
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static inline mp_uint_t mp_hal_ticks_us(void) {
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#if defined(MCU_SAMD21)
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return REG_TC4_COUNT32_COUNT;
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#elif defined(MCU_SAMD51)
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TC0->COUNT32.CTRLBSET.reg = TC_CTRLBSET_CMD_READSYNC;
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while (TC0->COUNT32.CTRLBSET.reg != 0) {
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}
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return REG_TC0_COUNT32_COUNT >> 3;
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#else
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return systick_ms * 1000;
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#endif
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}
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// ticks_cpu is limited to a 1 ms period, since the CPU SysTick counter
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// is used for the 1 ms SysTick_Handler interrupt.
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static inline mp_uint_t mp_hal_ticks_cpu(void) {
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return (system_time_t)SysTick->VAL;
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}
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static inline uint64_t mp_hal_time_ns(void) {
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return ((uint64_t)systick_ms + (uint64_t)systick_ms_upper * 0x100000000) * 1000000;
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}
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// C-level pin HAL
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#include "py/obj.h"
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#define MP_HAL_PIN_FMT "%u"
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#define mp_hal_pin_obj_t uint
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extern uint32_t machine_pin_open_drain_mask[];
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mp_hal_pin_obj_t mp_hal_get_pin_obj(mp_obj_t pin_in);
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void mp_hal_set_pin_mux(mp_hal_pin_obj_t pin, uint8_t mux);
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void mp_hal_clr_pin_mux(mp_hal_pin_obj_t pin);
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static inline unsigned int mp_hal_pin_name(mp_hal_pin_obj_t pin) {
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return pin;
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}
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static inline void mp_hal_pin_input(mp_hal_pin_obj_t pin) {
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gpio_set_pin_direction(pin, GPIO_DIRECTION_IN);
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machine_pin_open_drain_mask[pin / 32] &= ~(1 << (pin % 32));
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}
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static inline void mp_hal_pin_output(mp_hal_pin_obj_t pin) {
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gpio_set_pin_direction(pin, GPIO_DIRECTION_OUT);
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machine_pin_open_drain_mask[pin / 32] &= ~(1 << (pin % 32));
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}
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static inline void mp_hal_pin_open_drain(mp_hal_pin_obj_t pin) {
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gpio_set_pin_direction(pin, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(pin, GPIO_PULL_UP);
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machine_pin_open_drain_mask[pin / 32] |= 1 << (pin % 32);
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}
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static inline unsigned int mp_hal_get_pin_direction(mp_hal_pin_obj_t pin) {
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return (PORT->Group[pin / 32].DIR.reg & (1 << (pin % 32))) >> (pin % 32);
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}
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static inline int mp_hal_pin_read(mp_hal_pin_obj_t pin) {
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return gpio_get_pin_level(pin);
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}
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static inline void mp_hal_pin_write(mp_hal_pin_obj_t pin, int v) {
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gpio_set_pin_level(pin, v);
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}
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static inline void mp_hal_pin_low(mp_hal_pin_obj_t pin) {
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gpio_set_pin_level(pin, 0);
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}
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static inline void mp_hal_pin_high(mp_hal_pin_obj_t pin) {
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gpio_set_pin_level(pin, 1);
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}
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static inline void mp_hal_pin_od_low(mp_hal_pin_obj_t pin) {
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gpio_set_pin_direction(pin, GPIO_DIRECTION_OUT);
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gpio_set_pin_level(pin, 0);
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}
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static inline void mp_hal_pin_od_high(mp_hal_pin_obj_t pin) {
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gpio_set_pin_direction(pin, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(pin, GPIO_PULL_UP);
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}
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#endif // MICROPY_INCLUDED_SAMD_MPHALPORT_H
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