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Add support for the TLC5947 24-Channel, 12-Bit PWM LED Driver (#2066)

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Co-authored-by: Richard Nauber <richard@nauber.dev>
This commit is contained in:
rnauber
2021-07-29 11:16:04 +02:00
committed by GitHub
parent 8dbac20f8b
commit c6c857dfff
6 changed files with 223 additions and 0 deletions
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esphome/components/tlc5947/tlc5947.cpp
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#include "tlc5947.h"
#include "esphome/core/log.h"
namespace esphome {
namespace 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);
ESP_LOGCONFIG(TAG, "Done setting up TLC5947 output component.");
}
void TLC5947::dump_config() {
ESP_LOGCONFIG(TAG, "TLC5947:");
LOG_PIN(" Data Pin: ", this->data_pin_);
LOG_PIN(" Clock Pin: ", this->clock_pin_);
LOG_PIN(" LAT Pin: ", this->lat_pin_);
if (this->outenable_pin_ != nullptr)
LOG_PIN(" OE Pin: ", this->outenable_pin_);
ESP_LOGCONFIG(TAG, " Number of chips: %u", this->num_chips_);
}
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;
}
} // namespace tlc5947
} // namespace esphome