35 lines
1018 B
C
35 lines
1018 B
C
/**
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* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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// Output PWM signals on pins 0 and 1
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#include "pico/stdlib.h"
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#include "hardware/pwm.h"
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int main() {
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///tag::setup_pwm[]
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// Tell GPIO 0 and 1 they are allocated to the PWM
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gpio_set_function(0, GPIO_FUNC_PWM);
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gpio_set_function(1, GPIO_FUNC_PWM);
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// Find out which PWM slice is connected to GPIO 0 (it's slice 0)
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uint slice_num = pwm_gpio_to_slice_num(0);
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// Set period of 4 cycles (0 to 3 inclusive)
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pwm_set_wrap(slice_num, 3);
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// Set channel A output high for one cycle before dropping
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pwm_set_chan_level(slice_num, PWM_CHAN_A, 1);
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// Set initial B output high for three cycles before dropping
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pwm_set_chan_level(slice_num, PWM_CHAN_B, 3);
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// Set the PWM running
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pwm_set_enabled(slice_num, true);
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///end::setup_pwm[]
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// Note we could also use pwm_set_gpio_level(gpio, x) which looks up the
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// correct slice and channel for a given GPIO.
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}
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