@jimit 在 GPS + GSM 中说：
@richardmike4 Hi Richard,
Some modules use the same GPIO - in this case only one module can be actively used at a time.
It would be a good idea to add some jumpers on such modules to select the communication pins.
There is plenty of space on the board for that purpose.
For example, GPS & GSM modules, apart from the fact that they cannot be used at the same time, are completely unusable on M5Stack with psRAM on which pins 16&17 are used to access psRAM.