nodemcu-firmware/sdk/esp_iot_sdk_v1.4.0/examples/at/!!!readme!!!.txt

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Notice: AT added some functions so it's larger than before, if you want to compile it, please compile it as 1024KB or larger flash in compilation STEP 5.
1<EFBFBD><EFBFBD>compile options
(1) COMPILE
Possible value: gcc
Default value:
If not set, use xt-xcc by default.
(2) BOOT
Possible value: none/old/new
none: no need boot
old: use boot_v1.1
new: use boot_v1.2+
Default value: none
(3) APP
Possible value: 0/1/2
0: original mode, generate eagle.app.v6.flash.bin and eagle.app.v6.irom0text.bin
1: generate user1
2: generate user2
Default value: 0
(3) SPI_SPEED
Possible value: 20/26.7/40/80
Default value: 40
(4) SPI_MODE
Possible value: QIO/QOUT/DIO/DOUT
Default value: QIO
(4) SPI_SIZE
Possible value: 0/2/3/4/5/6
Default value: 0
For example:
make COMPILE=gcc BOOT=new APP=1 SPI_SPEED=40 SPI_MODE=QIO SPI_SIZE_MAP=0
2<EFBFBD><EFBFBD>You can also use gen_misc to make and generate specific bin you needed.
Linux: ./gen_misc.sh
Windows: gen_misc.bat
Follow the tips and steps.