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109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
#include "max31855.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace max31855 {
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static const char *const TAG = "max31855";
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void MAX31855Sensor::update() {
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this->enable();
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delay(1);
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// conversion initiated by rising edge
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this->disable();
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// Conversion time typ: 170ms, max: 220ms
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auto f = std::bind(&MAX31855Sensor::read_data_, this);
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this->set_timeout("value", 220, f);
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}
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void MAX31855Sensor::setup() {
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ESP_LOGCONFIG(TAG, "Setting up MAX31855Sensor '%s'...", this->name_.c_str());
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this->spi_setup();
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}
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void MAX31855Sensor::dump_config() {
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ESP_LOGCONFIG(TAG, "MAX31855:");
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LOG_PIN(" CS Pin: ", this->cs_);
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LOG_UPDATE_INTERVAL(this);
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LOG_SENSOR(" ", "Thermocouple", this);
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if (this->temperature_reference_) {
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LOG_SENSOR(" ", "Reference", this->temperature_reference_);
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} else {
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ESP_LOGCONFIG(TAG, " Reference temperature disabled.");
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}
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}
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float MAX31855Sensor::get_setup_priority() const { return setup_priority::DATA; }
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void MAX31855Sensor::read_data_() {
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this->enable();
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delay(1);
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uint8_t data[4];
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this->read_array(data, 4);
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this->disable();
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const uint32_t mem = encode_uint32(data[0], data[1], data[2], data[3]);
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// Verify we got data
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if (mem != 0xFFFFFFFF) {
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this->status_clear_error();
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} else {
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ESP_LOGE(TAG, "No data received from MAX31855 (0x%08" PRIX32 "). Check wiring!", mem);
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this->publish_state(NAN);
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if (this->temperature_reference_) {
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this->temperature_reference_->publish_state(NAN);
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}
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this->status_set_error();
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return;
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}
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// Internal reference temperature always works
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if (this->temperature_reference_) {
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int16_t val = (mem & 0x0000FFF0) >> 4;
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if (val & 0x0800) {
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val |= 0xF000; // Pad out 2's complement
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}
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const float t_ref = float(val) * 0.0625f;
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ESP_LOGD(TAG, "Got reference temperature: %.4f°C", t_ref);
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this->temperature_reference_->publish_state(t_ref);
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}
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// Check thermocouple faults
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if (mem & 0x00000001) {
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ESP_LOGW(TAG, "Thermocouple open circuit (not connected) fault from MAX31855 (0x%08" PRIX32 ")", mem);
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this->publish_state(NAN);
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this->status_set_warning();
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return;
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}
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if (mem & 0x00000002) {
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ESP_LOGW(TAG, "Thermocouple short circuit to ground fault from MAX31855 (0x%08" PRIX32 ")", mem);
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this->publish_state(NAN);
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this->status_set_warning();
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return;
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}
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if (mem & 0x00000004) {
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ESP_LOGW(TAG, "Thermocouple short circuit to VCC fault from MAX31855 (0x%08" PRIX32 ")", mem);
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this->publish_state(NAN);
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this->status_set_warning();
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return;
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}
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if (mem & 0x00010000) {
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ESP_LOGW(TAG, "Got faulty reading from MAX31855 (0x%08" PRIX32 ")", mem);
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this->publish_state(NAN);
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this->status_set_warning();
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return;
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}
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// Decode thermocouple temperature
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int16_t val = (mem & 0xFFFC0000) >> 18;
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if (val & 0x2000) {
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val |= 0xC000; // Pad out 2's complement
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}
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const float t_sense = float(val) * 0.25f;
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ESP_LOGD(TAG, "Got thermocouple temperature: %.2f°C", t_sense);
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this->publish_state(t_sense);
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this->status_clear_warning();
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}
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} // namespace max31855
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} // namespace esphome
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