tlc5947.cpp

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#include "tlc5947.h"
#include "esphome/core/log.h"
 
namespace esphome::tlc5947 {
 
static const char *const TAG = "tlc5947";
 
void TLC5947::setup() {
  this->data_pin_->setup();
  this->data_pin_->digital_write(true);
  this->clock_pin_->setup();
  this->clock_pin_->digital_write(true);
  this->lat_pin_->setup();
  this->lat_pin_->digital_write(true);
  if (this->outenable_pin_ != nullptr) {
    this->outenable_pin_->setup();
    this->outenable_pin_->digital_write(false);
  }
 
  this->pwm_amounts_.resize(this->num_chips_ * N_CHANNELS_PER_CHIP, 0);
}
void TLC5947::dump_config() {
  ESP_LOGCONFIG(TAG,
                "TLC5947:\n"
                "  Number of chips: %u",
                this->num_chips_);
  LOG_PIN("  Data Pin: ", this->data_pin_);
  LOG_PIN("  Clock Pin: ", this->clock_pin_);
  LOG_PIN("  LAT Pin: ", this->lat_pin_);
  LOG_PIN("  OE Pin: ", this->outenable_pin_);
}
 
void TLC5947::loop() {
  if (!this->update_)
    return;
 
  this->lat_pin_->digital_write(false);
 
  // push the data out, MSB first, 12 bit word per channel, 24 channels per chip
  for (int32_t ch = N_CHANNELS_PER_CHIP * num_chips_ - 1; ch >= 0; ch--) {
    uint16_t word = pwm_amounts_[ch];
    for (uint8_t bit = 0; bit < 12; bit++) {
      this->clock_pin_->digital_write(false);
      this->data_pin_->digital_write(word & 0x800);
      word <<= 1;
 
      this->clock_pin_->digital_write(true);
      this->clock_pin_->digital_write(true);  // TWH0>12ns, so we should be fine using this as delay
    }
  }
 
  this->clock_pin_->digital_write(false);
 
  // latch the values, so they will be applied
  this->lat_pin_->digital_write(true);
  delayMicroseconds(1);  // TWH1 > 30ns
  this->lat_pin_->digital_write(false);
 
  this->update_ = false;
}
 
void TLC5947::set_channel_value(uint16_t channel, uint16_t value) {
  if (channel >= this->num_chips_ * N_CHANNELS_PER_CHIP)
    return;
  if (this->pwm_amounts_[channel] != value) {
    this->update_ = true;
  }
  this->pwm_amounts_[channel] = value;
}
 
}  // namespace esphome::tlc5947