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26 lines
601 B
C
26 lines
601 B
C
/*
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* Copyright (C) 2019 Philipp-Alexander Blum <philipp-blum@jakiku.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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#include "periph/gpio.h"
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#include <stdint.h>
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uint8_t gpio_util_shiftin(gpio_t data_pin, gpio_t clock_pin)
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{
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uint8_t byte = 0x00;
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for (unsigned int i = 8; i > 0; i--) {
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gpio_set(clock_pin);
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if (gpio_read(data_pin) > 0) {
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byte |= (1 << (i - 1));
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}
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gpio_clear(clock_pin);
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}
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return byte;
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}
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