81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
#include "mcp9808.h"
|
|
#include "esphome/core/log.h"
|
|
|
|
namespace esphome {
|
|
namespace mcp9808 {
|
|
|
|
static const uint8_t MCP9808_REG_AMBIENT_TEMP = 0x05;
|
|
static const uint8_t MCP9808_REG_MANUF_ID = 0x06;
|
|
static const uint8_t MCP9808_REG_DEVICE_ID = 0x07;
|
|
|
|
static const uint16_t MCP9808_MANUF_ID = 0x0054;
|
|
static const uint16_t MCP9808_DEV_ID = 0x0400;
|
|
|
|
static const uint8_t MCP9808_AMBIENT_CLEAR_FLAGS = 0x1F;
|
|
static const uint8_t MCP9808_AMBIENT_CLEAR_SIGN = 0x0F;
|
|
static const uint8_t MCP9808_AMBIENT_TEMP_NEGATIVE = 0x10;
|
|
|
|
static const char *const TAG = "mcp9808";
|
|
|
|
void MCP9808Sensor::setup() {
|
|
ESP_LOGCONFIG(TAG, "Running setup for '%s'", this->name_.c_str());
|
|
|
|
uint16_t manu = 0;
|
|
if (!this->read_byte_16(MCP9808_REG_MANUF_ID, &manu) || manu != MCP9808_MANUF_ID) {
|
|
this->mark_failed();
|
|
ESP_LOGE(TAG, "Incorrect manufacturer ID (%X) for '%s'", manu, this->name_.c_str());
|
|
return;
|
|
}
|
|
uint16_t dev_id = 0;
|
|
if (!this->read_byte_16(MCP9808_REG_DEVICE_ID, &dev_id) || dev_id != MCP9808_DEV_ID) {
|
|
this->mark_failed();
|
|
ESP_LOGE(TAG, "Incorrect device ID (%X) for '%s'", dev_id, this->name_.c_str());
|
|
return;
|
|
}
|
|
}
|
|
void MCP9808Sensor::dump_config() {
|
|
ESP_LOGCONFIG(TAG, "%s:", this->name_.c_str());
|
|
LOG_I2C_DEVICE(this);
|
|
if (this->is_failed()) {
|
|
ESP_LOGE(TAG, ESP_LOG_MSG_COMM_FAIL_FOR, this->name_.c_str());
|
|
}
|
|
LOG_UPDATE_INTERVAL(this);
|
|
LOG_SENSOR(" ", "Temperature", this);
|
|
}
|
|
void MCP9808Sensor::update() {
|
|
uint16_t raw_temp;
|
|
if (!this->read_byte_16(MCP9808_REG_AMBIENT_TEMP, &raw_temp)) {
|
|
this->status_set_warning();
|
|
return;
|
|
}
|
|
if (raw_temp == 0xFFFF) {
|
|
this->status_set_warning();
|
|
return;
|
|
}
|
|
|
|
float temp = NAN;
|
|
uint8_t msb = (uint8_t) ((raw_temp & 0xff00) >> 8);
|
|
uint8_t lsb = raw_temp & 0x00ff;
|
|
|
|
msb = msb & MCP9808_AMBIENT_CLEAR_FLAGS;
|
|
|
|
if ((msb & MCP9808_AMBIENT_TEMP_NEGATIVE) == MCP9808_AMBIENT_TEMP_NEGATIVE) {
|
|
msb = msb & MCP9808_AMBIENT_CLEAR_SIGN;
|
|
temp = (256 - ((uint16_t) (msb) *16 + lsb / 16.0f)) * -1;
|
|
} else {
|
|
temp = (uint16_t) (msb) *16 + lsb / 16.0f;
|
|
}
|
|
|
|
if (std::isnan(temp)) {
|
|
this->status_set_warning();
|
|
return;
|
|
}
|
|
|
|
ESP_LOGD(TAG, "%s: Got temperature=%.4f°C", this->name_.c_str(), temp);
|
|
this->publish_state(temp);
|
|
this->status_clear_warning();
|
|
}
|
|
float MCP9808Sensor::get_setup_priority() const { return setup_priority::DATA; }
|
|
|
|
} // namespace mcp9808
|
|
} // namespace esphome
|