mirror of
https://github.com/Threnklyn/esphome-dev.git
synced 2026-05-19 04:33:27 +02:00
Stefan Agner
78 lines
2.2 KiB
C++
78 lines
2.2 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_->pin_mode(OUTPUT);
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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_->pin_mode(OUTPUT);
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this->data_pin_->pin_mode(OUTPUT);
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this->latch_pin_->pin_mode(OUTPUT);
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this->clock_pin_->digital_write(LOW);
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this->data_pin_->digital_write(LOW);
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this->latch_pin_->digital_write(LOW);
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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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bool SN74HC595Component::digital_read_(uint8_t pin) { return this->output_bits_ >> pin; }
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void SN74HC595Component::digital_write_(uint8_t pin, bool value) {
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uint32_t mask = 1UL << pin;
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this->output_bits_ &= ~mask;
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if (value)
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this->output_bits_ |= mask;
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this->write_gpio_();
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}
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bool SN74HC595Component::write_gpio_() {
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for (int i = this->sr_count_ - 1; i >= 0; i--) {
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uint8_t data = (uint8_t)(this->output_bits_ >> (8 * i) & 0xff);
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for (int j = 0; j < 8; j++) {
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this->data_pin_->digital_write(data & (1 << (7 - j)));
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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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// 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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return true;
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}
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float SN74HC595Component::get_setup_priority() const { return setup_priority::IO; }
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void SN74HC595GPIOPin::setup() {}
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bool SN74HC595GPIOPin::digital_read() { return this->parent_->digital_read_(this->pin_) != this->inverted_; }
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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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SN74HC595GPIOPin::SN74HC595GPIOPin(SN74HC595Component *parent, uint8_t pin, bool inverted)
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: GPIOPin(pin, OUTPUT, inverted), parent_(parent) {}
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} // namespace sn74hc595
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} // namespace esphome
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