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https://github.com/esphome/esphome.git
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100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
#include "sn74hc595.h"
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#include "esphome/core/log.h"
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#include <ranges>
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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::pre_setup_() {
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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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}
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void SN74HC595Component::post_setup_() {
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this->latch_pin_->setup();
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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 SN74HC595GPIOComponent::setup() {
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this->pre_setup_();
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this->clock_pin_->setup();
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this->data_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->post_setup_();
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}
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#ifdef USE_SPI
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void SN74HC595SPIComponent::setup() {
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this->pre_setup_();
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this->spi_setup();
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this->post_setup_();
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}
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#endif
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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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if (value) {
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this->output_bytes_[pin / 8] |= (1 << (pin % 8));
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} else {
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this->output_bytes_[pin / 8] &= ~(1 << (pin % 8));
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}
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this->write_gpio();
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}
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void SN74HC595GPIOComponent::write_gpio() {
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for (uint8_t &output_byte : std::ranges::reverse_view(this->output_bytes_)) {
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for (int8_t i = 7; i >= 0; i--) {
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bool bit = (output_byte >> i) & 1;
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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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}
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SN74HC595Component::write_gpio();
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}
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#ifdef USE_SPI
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void SN74HC595SPIComponent::write_gpio() {
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for (uint8_t &output_byte : std::ranges::reverse_view(this->output_bytes_)) {
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this->enable();
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this->write_byte(output_byte);
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this->disable();
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}
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SN74HC595Component::write_gpio();
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}
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#endif
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void SN74HC595Component::write_gpio() {
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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 { return str_snprintf("%u via SN74HC595", 18, pin_); }
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} // namespace sn74hc595
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} // namespace esphome
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