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994d22bb71
Co-authored-by: Takashi Toyoshima <toyoshim@google.com> Co-authored-by: Shun Ikejima <ikejima@google.com>
40 lines
1.0 KiB
C++
40 lines
1.0 KiB
C++
// Copyright 2025 Google Inc.
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// Use of this source code is governed by an Apache License that can be found
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// in the LICENSE file.
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#include "photo_sensor.h"
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#include "hardware/gpio.h"
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//#define NO_SENSOR_PULL
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PhotoSensor::PhotoSensor(int8_t bit0,
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int8_t bit1,
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int8_t bit2,
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int8_t bit3,
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int8_t bit4,
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int8_t bit5)
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: bits({bit0, bit1, bit2, bit3, bit4, bit5}) {
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for (int8_t gpio : bits) {
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gpio_init(gpio);
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gpio_set_dir(gpio, GPIO_IN);
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#ifdef NO_SENSOR_PULL
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gpio_disable_pulls(gpio);
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#else
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// Built-in 50-80K pull-up is expected, but the actual value appears to
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// depend on the RP2040's shipping years?
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gpio_pull_up(gpio);
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#endif // NO_SENSOR_PULL
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}
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}
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uint8_t PhotoSensor::Read() {
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uint8_t value = 0;
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for (size_t bit = 0; bit < bits.size(); ++bit) {
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if (bits[bit] == kNotUsed) {
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break;
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}
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value |= gpio_get(bits[bit]) ? (1 << bit) : 0;
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}
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return value;
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} |