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STM32F7 - Power Fault

Question asked by nic17 on Oct 1, 2016
Latest reply on Feb 22, 2017 by KIC8462852 EPIC204278916
I am working on connecting a ESP8266-01 WiFi chip to the STM32F769NI-DISCO board. I have enabled UART5 in STM32CUBE and put EXT_SCL, EXT_RST and EXT_SDA into high impedance mode by putting them as inputs with NOPULL (as per the user manual: page 20). Once I connect the boards, I get a Fault Power error with LED LD7 blinking. I have root caused this to Pin 6 (CH_PD/EXT_RST). The Fault Power does not show if that wire is not connected.