Maybe dx1 internal quartz 37Mhz, but in your platform defined 26Mhz.
do you mean that the expected speed on WL_GPIO_2 is 115200 baud ?
Can you (or someone else) confirm that this pin of this chip has a uart-like signal at that speed ?
BTW, i don't know what internal Quartz in used in 1DX module (Murata people ? are you reading us ?). I have been unable to find this information in the specification document I have access to.
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37/26 ~ 160/115,2. it is my note. In log i see 26M firmware loaded.
I know that possible use 26M or 37M with 43438 chip and firmware different.
You self confirmed about that this pin of this chip has a uart-like signal.
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XTAL in the module is 37M
I don't know the crystal frequency into the module, but the software is happy when 37,4MHz is declared.