Espressif Systems ESP8266 SDK Getting Started Manual page 34

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4. Applications, such as smart lights, work at a wide temperature range of -40 °C to
125 °C, and need to track and correct the frequency offset automatically. The
frequency offset at ambient temperature is large, so the initial offset correction
value is needed.
If the frequency offset is +160 kHz (at ambient temperature), users can set byte 112
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= 0x0B, byte 113 = (256 - 160/8) = 236 = 0xEC.
If the frequency offset is -160 kHz (at ambient temperature), users can set byte 112
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= 0x09, byte 113 = 160/8 = 20 = 0x14. But this may effect the digital peripheral
performance and needs substantive tests, so we do not recommend it.
We recommend Example 3.
When the configuration of RF initialization is done, click GenInitBin button to generate
esp_init_data_setting.bin.
In addition, users can click Default button to set the value of frequency offset to default, or
click LoadInitBin button to import a binary file for configuration.
Espressif 29 33 ! /!
6. Downloading the Firmware
2017.05