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SP1ML-915 custom firmware

Question asked by schwamb.pete on Oct 5, 2015
Latest reply on Feb 4, 2016 by argonne.dario
I'm wanting to load a custom firmware onto the SP1ML-915, as I'd like to implement abilities I can't get through the existing AT command set. 

Where can I find documentation about how the STM32L151RB is connected to the Spirit1 chip?  i.e. which spi on what pins? 

Also, does STM32CubeMX offer any help in setting up a base for a this type of firmware?  Would appreciate any pointers, as I'm fairly new to all of this.