User's Manual

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6. Downloading the Firmware
The following section introduces how to modify the 112 ~ 114 byte parameters. Figure 6-3 shows
the initial configuration.
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Figure 6-3. 112 ～ 114 Byte Parameters
Modify the RF Initialization Parameters
Byte 114 is used to control THE RF initialization when ESP8266 is powered on. Table 6-5 provides
the parameter configuration.
Correct Frequency Offset
Byte 112 and byte 113 relate to the frequency offset correction. Table 6-6 provides the parameter
configuration.
📖 Note:
Supported by ESP8266_NONOS_SDK_V1.5.3 and ESP8266_RTOS_SDK_V1.3.0 and higher.
Table 6-5. Modify RF Initialization Parameters
Option
Description
byte 114 = 0
Only a VDD33 calibration is performed during the RF initialization. It takes about 2
ms and the least initial current.
byte 114 = 1
The default value is 1.
VDD33 and TX power calibrations are performed during the RF initialization. It takes
about 18 ms and small initial current.
byte 114 = 2
The same as when “ byte 114 = 0”.
byte 114 = 3
All calibrations are performed during the RF initialization. It takes about 200 ms and
large initial current.
📖 Note:
Supported by ESP8266_NONOS_SDK_V1.4.0 and ESP8266_RTOS_SDK_V1.3.0 and higher.
Table 6-6. Options for Frequency Offset Correction
Option
Description
The default value of byte 112 is 0.
bit 0
This bit is of the highest priority.
• bit 0 = 0: frequency offset cannot be corrected.
• bit 0 = 1: frequency offset can be corrected.
Espressif
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2017.11