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Fix bogus reading on no communication with MAX31865 (#3505)

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DAVe3283 2022-06-07 15:58:32 -06:00 committed by GitHub
parent 0d1028be2e
commit 03944e6cd8
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3 changed files with 12 additions and 0 deletions
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1
CODEOWNERS
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@ -103,6 +103,7 @@ esphome/components/lilygo_t5_47/touchscreen/* @jesserockz
esphome/components/lock/* @esphome/core esphome/components/lock/* @esphome/core
esphome/components/logger/* @esphome/core esphome/components/logger/* @esphome/core
esphome/components/ltr390/* @sjtrny esphome/components/ltr390/* @sjtrny
esphome/components/max31865/* @DAVe3283
esphome/components/max44009/* @berfenger esphome/components/max44009/* @berfenger
esphome/components/max7219digit/* @rspaargaren esphome/components/max7219digit/* @rspaargaren
esphome/components/max9611/* @mckaymatthew esphome/components/max9611/* @mckaymatthew

8
esphome/components/max31865/max31865.cpp
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@ -94,6 +94,14 @@ void MAX31865Sensor::read_data_() {
const uint16_t rtd_resistance_register = this->read_register_16_(RTD_RESISTANCE_MSB_REG); const uint16_t rtd_resistance_register = this->read_register_16_(RTD_RESISTANCE_MSB_REG);
this->write_config_(0b11000000, 0b00000000); this->write_config_(0b11000000, 0b00000000);
// Check for bad connection
if (rtd_resistance_register == 0b0000000000000000 || rtd_resistance_register == 0b1111111111111111) {
ESP_LOGE(TAG, "SPI bus read all 0 or all 1 (0x%04X), check MAX31865 wiring & power.", rtd_resistance_register);
this->publish_state(NAN);
this->status_set_error();
return;
}
// Check faults // Check faults
const uint8_t faults = this->read_register_(FAULT_STATUS_REG); const uint8_t faults = this->read_register_(FAULT_STATUS_REG);
if ((has_fault_ = faults & 0b00111100)) { if ((has_fault_ = faults & 0b00111100)) {

3
esphome/components/max31865/sensor.py
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@ -11,6 +11,9 @@ from esphome.const import (
UNIT_CELSIUS, UNIT_CELSIUS,
) )
CODEOWNERS = ["@DAVe3283"]
DEPENDENCIES = ["spi"]
max31865_ns = cg.esphome_ns.namespace("max31865") max31865_ns = cg.esphome_ns.namespace("max31865")
MAX31865Sensor = max31865_ns.class_( MAX31865Sensor = max31865_ns.class_(
"MAX31865Sensor", sensor.Sensor, cg.PollingComponent, spi.SPIDevice "MAX31865Sensor", sensor.Sensor, cg.PollingComponent, spi.SPIDevice