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How to use UART4 on a STM32L475IOT board? I want to connect a GPS module with NMEA output

Kde G.2
Associate

I use the STM32 System Workbench, tried examples of other boards. The system does not see my main.h and says: Symbol UART4 cannot be resolved. Compilation gives no errors, but in the source I see those undefines being red underlined.

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