28 lines
797 B
Plaintext
28 lines
797 B
Plaintext
;
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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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.program pio_serialiser
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; Just serialise a stream of bits. Take 32 bits from each FIFO record. LSB-first.
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.wrap_target
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out pins, 1
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.wrap
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% c-sdk {
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static inline void pio_serialiser_program_init(PIO pio, uint sm, uint offset, uint data_pin, float clk_div) {
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pio_gpio_init(pio, data_pin);
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pio_sm_set_consecutive_pindirs(pio, sm, data_pin, 1, true);
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pio_sm_config c = pio_serialiser_program_get_default_config(offset);
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sm_config_set_out_pins(&c, data_pin, 1);
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sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
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sm_config_set_clkdiv(&c, clk_div);
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sm_config_set_out_shift(&c, true, true, 32);
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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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