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audio_playback_and_record example add uart2

Question asked by dantas.dan on Jun 25, 2015
hello everyone.
this week i start to dev in stm32f4discovery
install cubeMX and get examples STM32Cube_FW_F4_v1.6.0

at this point i want to add an uart to send the "song" name to be played

i added the library stm32f4xx_hal_usart.c and stm32f4xx_hal_uart.c (in any case )
and when i try to build it generate the error
"STM32F4-DISCO\STM32F4-DISCO.axf: Error: L6218E: Undefined symbol HAL_UART_Init (referred from main.o)."
because of the line 677 - see print atach

there is any point i'm missing?

2) why is no the manage run-time environment icon (green box) not active? as others projects ...

thanks in advance
grettings from Portugal