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  | /* | |
| * In ESP 12 modules, spec. D1 Mini mounted, GPIO9 and GPIO10 can sort of be freed up. | |
| * GPIO9 is connected to flash HOLD | |
| * GPIO10 is connected to flash WP | |
| * | |
| * In DIO mode, these pins should be free, but remain connected to the flash chip. | |
| * Using GPIO9 will crash the module sooner or later, GPIO10 is relatively safe, but | |
| * don't fuzz it. Might be good enough for SPI CS or similar, no data rates pl0x. | |
| */ |