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Forum Post: RE: RTOS/TM4C123GH6ZRB: TCA9535 access using I2C before the BIOS start

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[quote user="Gowtham R"] GPIOPadConfigSet (GPIO_PORTB_BASE, GPIO_PIN_3, GPIO_STRENGTH_8MA_SC, GPIO_DIR_MODE_HW | GPIO_PIN_TYPE_OD);[/quote] I am almost certain that this function proves "harmful" to your earlier use of, " GPIOPinType() & GPIOPinConfigure() " - especially when I2C is employed. Removing that "PadConfig" call should prove quick & easy - and I suspect will succeed...

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