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ESP8266 NONOS SDK V2.0.0 20160810

ESP8266_NONOS_SDK_V2.0.0_16_08_10 Release Notes

1. Changed the license of some source files to espressif MIT.
2. Updated libphy.a to 1055, fixed an issue of large current in Light-sleep.
3. Updated AT+ to 1.3.0:
   3.1 Added Light-sleep wakeup command, AT+WAKEUPGPIO;
   3.2 Fixed abnormal AT+CWDHCPS IP allocation;
   3.3 Added at_sdio demo under example directory.
4. Fixed probable system default when calling cur and def interfaces.
5. Fixed the issue of high current in Deep-sleep mode without disabling SPI first.
6. Fixed an issue where the SDK would crash when switching from AP to Station mode by calling wifi_set_phy_mode.
7. Updated secondary boot loader to v1.6:
   7.1 Supports AT + based on SDIO;
   7.2 Supports entering testing mode through GPIO.
8. Added support for MXIC Flash QIO mode.
9. Fixed exception caused during TCP handshake and retransmission.
10. Fixed issues in ESP-NOW.
11. Added ESP-PAIR (Simple-Pair) feature, for APIs please refer to ESP8266 SDK API Guide.
12. wpa2-enterprise time function derivation and time check disable can be set by users.
13. Support for PEAP/TTLS in wpa2-enterprise, for APIs please refer to ESP8266 SDK API Guide.
14. Added mqtt demos under examples directory.
15. Other issue fixes.
16. Resolved an issue that RF_Init_data sector may be broken in stress test. Provided a function user_rf_cal_sector_set which has to be added in application by software developer. More details about user_rf_cal_sector_set refer to documentation "2C-ESP8266__SDK__API Guide". (Resolved in ESP8266_NONOS_SDK_V1.5.4.1) 
17. Fix a potential risk that will cause rf not work after external reset. (Resolved in ESP8266_NONOS_SDK_V1.5.4.1)
18. Add SDIO AT support. (Resolved in ESP8266_NONOS_SDK_V1.5.4.1)
19. Fix a potential bug in espconn. (Resolved in ESP8266_NONOS_SDK_V1.5.4.1)

ESP8266_NONOS_SDK Notes:

1. esp_init_data.bin has to be downloaded into flash at least once.
2. Download blank.bin to initialize the sector stored RF_CAL parameter (set by user_rf_cal_sector_set), and download esp_init_data.bin into flash, when the system needs to be initialized, or RF needs to be calibrated again.

AT Notes:

1. Since the release of ESP8266_NONOS_SDK_V1.5.0, AT firmware is too large to use 4Mbit flash. Please choose flash with at least 8Mbit capacity. 
2. Firmware upgrade over-the-air process is changed a bit. We will upgrade the latest AT firmware to Espressif Cloud server only after it has been tested and the overall performance is guaranteed.Users may not be able to use AT+CIUPDATE in ESP8266_NONOS_SDK_V1.5.0 and other more advanced versions.
NON-OS SDK V2.0.0 2016.08.10
ESP8266 NONOS SDK V2.0.0 patch 20160809

ESP8266_NONOS_SDK_V2.0.0_patch release notes

This patch is based on ESP8266_NONOS_SDK_V2.0.0. While using it, users should use .a file in the package to overwrite the corresponding files subject to SDK/lib directory.

The updates are as follows:

1. Slow connection problems in some cases have been solved.

2. Provided an interface to enable automatic calibration of frequency offset: void system_phy_freq_trace_enable(bool enable); By default, the automatic calibration of frequency offset is off. To enable it, this function should be called in user_rf_pre_init(). Its parameter is true.

Note:

Users should confirm that only when ambient temperature is higher than the normal operating temperature range that crystal oscillator requires does this function need to be enabled. In general,  this function is not recommended to be enabled if ambient temperature is lower than 80 ℃.

NON-OS SDK V2.0.0 2016.08.08
ESP8266 NONOS SDK V2.1.0 20170505

ESP8266 Non OS SDK V2.1.0.

NON-OS SDK V2.1.0 2017.05.05
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