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57 lines
1.7 KiB
Plaintext
57 lines
1.7 KiB
Plaintext
; Copyright (c) 2019 Arduino LLC. All right reserved.
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;
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; This library is free software; you can redistribute it and/or
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; modify it under the terms of the GNU Lesser General Public
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; License as published by the Free Software Foundation; either
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; version 2.1 of the License, or (at your option) any later version.
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;
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; This library is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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; See the GNU Lesser General Public License for more details.
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;
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; You should have received a copy of the GNU Lesser General Public
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; License along with this library; if not, write to the Free Software
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; Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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.program pdm_pio
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.side_set 1
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.wrap_target
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; prova a cambiare edge
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;sample on falling edge
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push iffull noblock side 1
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;nop side 1
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;nop side 0
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in pins, 1 side 0
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;nop side 0
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.wrap
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% c-sdk {
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#include "hardware/gpio.h"
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static inline void pdm_pio_program_init(PIO pio, uint sm, uint offset, uint clkPin, uint dataPin, float clkDiv) {
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pio_sm_config c = pdm_pio_program_get_default_config(offset);
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sm_config_set_sideset(&c, 1, false, false);
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//sm_config_set_in_shift(&c, false, true, 8);
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sm_config_set_in_shift(&c, false, false, 8);
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sm_config_set_in_pins(&c, dataPin);
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sm_config_set_sideset_pins(&c, clkPin);
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sm_config_set_clkdiv(&c, clkDiv);
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pio_sm_set_consecutive_pindirs(pio, sm, dataPin, 1, false);
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pio_sm_set_consecutive_pindirs(pio, sm, clkPin, 1, true);
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pio_sm_set_pins_with_mask(pio, sm, 0, (1u << clkPin) );
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//pio_gpio_init(pio, dataPin);
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pio_gpio_init(pio, clkPin);
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pio_sm_init(pio, sm, offset, &c);
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pio_sm_set_enabled(pio, sm, true);
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}
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%}
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