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69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
// Based on the TC74 datasheet https://ww1.microchip.com/downloads/en/DeviceDoc/21462D.pdf
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#include "tc74.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace tc74 {
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static const char *const TAG = "tc74";
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static const uint8_t TC74_REGISTER_TEMPERATURE = 0x00;
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static const uint8_t TC74_REGISTER_CONFIGURATION = 0x01;
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static const uint8_t TC74_DATA_READY_MASK = 0x40;
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// It is possible the "Data Ready" bit will not be set if the TC74 has not been powered on for at least 250ms, so it not
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// being set does not constitute a failure.
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void TC74Component::setup() {
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ESP_LOGCONFIG(TAG, "Setting up TC74...");
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uint8_t config_reg;
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if (this->read_register(TC74_REGISTER_CONFIGURATION, &config_reg, 1) != i2c::ERROR_OK) {
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this->mark_failed();
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return;
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}
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this->data_ready_ = config_reg & TC74_DATA_READY_MASK;
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}
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void TC74Component::update() { this->read_temperature_(); }
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void TC74Component::dump_config() {
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LOG_SENSOR("", "TC74", this);
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LOG_I2C_DEVICE(this);
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if (this->is_failed()) {
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ESP_LOGE(TAG, "Connection with TC74 failed!");
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}
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LOG_UPDATE_INTERVAL(this);
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}
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void TC74Component::read_temperature_() {
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if (!this->data_ready_) {
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uint8_t config_reg;
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if (this->read_register(TC74_REGISTER_CONFIGURATION, &config_reg, 1) != i2c::ERROR_OK) {
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this->status_set_warning();
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return;
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}
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if (config_reg & TC74_DATA_READY_MASK) {
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this->data_ready_ = true;
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} else {
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ESP_LOGD(TAG, "TC74 not ready");
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return;
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}
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}
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uint8_t temperature_reg;
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if (this->read_register(TC74_REGISTER_TEMPERATURE, &temperature_reg, 1) != i2c::ERROR_OK) {
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this->status_set_warning();
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return;
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}
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ESP_LOGD(TAG, "Got Temperature=%d °C", temperature_reg);
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this->publish_state(temperature_reg);
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this->status_clear_warning();
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}
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float TC74Component::get_setup_priority() const { return setup_priority::DATA; }
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} // namespace tc74
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} // namespace esphome
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