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Using Printf() for usart in stm32f4 discovery board

Prabudda Geekiyanage

Hi
im new to the keil MDK .I want to use printf() for USART channels .after searching in the internet ,i found that i need to edit the redirect.c.So i added the redirect.c to my workspace . then i get following errors

.\TIM_PWM_Output\TIM_PWM_Output.axf: Error: L6218E: Undefined symbol SER_GetChar (referred from retarget.o).
.\TIM_PWM_Output\TIM_PWM_Output.axf: Error: L6218E: Undefined symbol SER_PutChar (referred from retarget.o).

i want to know where did i get wrong?

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