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71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
#include "sn74hc595.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace sn74hc595 {
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static const char *const TAG = "sn74hc595";
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void SN74HC595Component::setup() {
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ESP_LOGCONFIG(TAG, "Setting up SN74HC595...");
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if (this->have_oe_pin_) { // disable output
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this->oe_pin_->setup();
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this->oe_pin_->digital_write(true);
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}
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// initialize output pins
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this->clock_pin_->setup();
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this->data_pin_->setup();
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this->latch_pin_->setup();
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this->clock_pin_->digital_write(false);
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this->data_pin_->digital_write(false);
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this->latch_pin_->digital_write(false);
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// send state to shift register
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this->write_gpio_();
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}
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void SN74HC595Component::dump_config() { ESP_LOGCONFIG(TAG, "SN74HC595:"); }
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void SN74HC595Component::digital_write_(uint16_t pin, bool value) {
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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;
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}
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this->output_bits_[pin] = value;
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this->write_gpio_();
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}
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void SN74HC595Component::write_gpio_() {
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for (auto bit = this->output_bits_.rbegin(); bit != this->output_bits_.rend(); bit++) {
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this->data_pin_->digital_write(*bit);
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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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// pulse latch to activate new values
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this->latch_pin_->digital_write(true);
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this->latch_pin_->digital_write(false);
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// enable output if configured
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if (this->have_oe_pin_) {
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this->oe_pin_->digital_write(false);
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}
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}
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float SN74HC595Component::get_setup_priority() const { return setup_priority::IO; }
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void SN74HC595GPIOPin::digital_write(bool value) {
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this->parent_->digital_write_(this->pin_, value != this->inverted_);
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}
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std::string SN74HC595GPIOPin::dump_summary() const {
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char buffer[32];
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snprintf(buffer, sizeof(buffer), "%u via SN74HC595", pin_);
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return buffer;
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}
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} // namespace sn74hc595
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} // namespace esphome
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