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68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
#include "sn74hc165.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace sn74hc165 {
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static const char *const TAG = "sn74hc165";
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void SN74HC165Component::setup() {
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ESP_LOGCONFIG(TAG, "Setting up SN74HC165...");
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// initialize pins
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this->clock_pin_->setup();
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this->data_pin_->setup();
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this->load_pin_->setup();
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this->clock_pin_->digital_write(false);
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this->load_pin_->digital_write(false);
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if (this->clock_inhibit_pin_ != nullptr) {
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this->clock_inhibit_pin_->setup();
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this->clock_inhibit_pin_->digital_write(true);
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}
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// read state from shift register
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this->read_gpio_();
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}
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void SN74HC165Component::loop() { this->read_gpio_(); }
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void SN74HC165Component::dump_config() { ESP_LOGCONFIG(TAG, "SN74HC165:"); }
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bool SN74HC165Component::digital_read_(uint16_t pin) {
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if (pin >= this->sr_count_ * 8) {
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ESP_LOGE(TAG, "Pin %u is out of range! Maximum pin number with %u chips in series is %u", pin, this->sr_count_,
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(this->sr_count_ * 8) - 1);
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return false;
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}
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return this->input_bits_[pin];
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}
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void SN74HC165Component::read_gpio_() {
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this->load_pin_->digital_write(false);
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delayMicroseconds(5);
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this->load_pin_->digital_write(true);
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delayMicroseconds(5);
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if (this->clock_inhibit_pin_ != nullptr)
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this->clock_inhibit_pin_->digital_write(false);
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for (int16_t i = (this->sr_count_ * 8) - 1; i >= 0; i--) {
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this->input_bits_[i] = this->data_pin_->digital_read();
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this->clock_pin_->digital_write(true);
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this->clock_pin_->digital_write(false);
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}
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if (this->clock_inhibit_pin_ != nullptr)
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this->clock_inhibit_pin_->digital_write(true);
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}
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float SN74HC165Component::get_setup_priority() const { return setup_priority::IO; }
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bool SN74HC165GPIOPin::digital_read() { return this->parent_->digital_read_(this->pin_); }
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std::string SN74HC165GPIOPin::dump_summary() const { return str_snprintf("%u via SN74HC165", 18, pin_); }
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} // namespace sn74hc165
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} // namespace esphome
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