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Fix bogus reading on no communication with MAX31865 (#3505)
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3 changed files with 12 additions and 0 deletions
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@ -103,6 +103,7 @@ esphome/components/lilygo_t5_47/touchscreen/* @jesserockz
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esphome/components/lock/* @esphome/core
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esphome/components/logger/* @esphome/core
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esphome/components/ltr390/* @sjtrny
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esphome/components/max31865/* @DAVe3283
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esphome/components/max44009/* @berfenger
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esphome/components/max7219digit/* @rspaargaren
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esphome/components/max9611/* @mckaymatthew
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@ -94,6 +94,14 @@ void MAX31865Sensor::read_data_() {
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const uint16_t rtd_resistance_register = this->read_register_16_(RTD_RESISTANCE_MSB_REG);
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this->write_config_(0b11000000, 0b00000000);
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// Check for bad connection
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if (rtd_resistance_register == 0b0000000000000000 || rtd_resistance_register == 0b1111111111111111) {
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ESP_LOGE(TAG, "SPI bus read all 0 or all 1 (0x%04X), check MAX31865 wiring & power.", rtd_resistance_register);
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this->publish_state(NAN);
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this->status_set_error();
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return;
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}
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// Check faults
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const uint8_t faults = this->read_register_(FAULT_STATUS_REG);
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if ((has_fault_ = faults & 0b00111100)) {
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@ -11,6 +11,9 @@ from esphome.const import (
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UNIT_CELSIUS,
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)
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CODEOWNERS = ["@DAVe3283"]
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DEPENDENCIES = ["spi"]
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max31865_ns = cg.esphome_ns.namespace("max31865")
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MAX31865Sensor = max31865_ns.class_(
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"MAX31865Sensor", sensor.Sensor, cg.PollingComponent, spi.SPIDevice
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