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Change 4 chip limit on sn74hc595 to 256 (#4108)

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This commit is contained in:
Jesse Hills
2022-12-07 07:23:07 +13:00
committed by GitHub
parent 30a2fc1273
commit f34e797a0d
3 changed files with 32 additions and 34 deletions
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esphome/components/sn74hc595/sn74hc595.cpp
+12 -17
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@@ -28,24 +28,21 @@ void SN74HC595Component::setup() {
void SN74HC595Component::dump_config() { ESP_LOGCONFIG(TAG, "SN74HC595:"); }
bool SN74HC595Component::digital_read_(uint8_t pin) { return this->output_bits_ >> pin; }
void SN74HC595Component::digital_write_(uint8_t pin, bool value) {
uint32_t mask = 1UL << pin;
this->output_bits_ &= ~mask;
if (value)
this->output_bits_ |= mask;
void SN74HC595Component::digital_write_(uint16_t pin, bool value) {
if (pin >= this->sr_count_ * 8) {
ESP_LOGE(TAG, "Pin %u is out of range! Maximum pin number with %u chips in series is %u", pin, this->sr_count_,
(this->sr_count_ * 8) - 1);
return;
}
this->output_bits_[pin] = value;
this->write_gpio_();
}
bool SN74HC595Component::write_gpio_() {
for (int i = this->sr_count_ - 1; i >= 0; i--) {
uint8_t data = (uint8_t)(this->output_bits_ >> (8 * i) & 0xff);
for (int j = 0; j < 8; j++) {
this->data_pin_->digital_write(data & (1 << (7 - j)));
this->clock_pin_->digital_write(true);
this->clock_pin_->digital_write(false);
}
void SN74HC595Component::write_gpio_() {
for (auto bit = this->output_bits_.rbegin(); bit != this->output_bits_.rend(); bit++) {
this->data_pin_->digital_write(*bit);
this->clock_pin_->digital_write(true);
this->clock_pin_->digital_write(false);
}
// pulse latch to activate new values
@@ -56,8 +53,6 @@ bool SN74HC595Component::write_gpio_() {
if (this->have_oe_pin_) {
this->oe_pin_->digital_write(false);
}
return true;
}
float SN74HC595Component::get_setup_priority() const { return setup_priority::IO; }