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Problem with USART with stm32f103c8t6 microcontroller

Question asked by sposito.matteo on Mar 25, 2013
Latest reply on Mar 29, 2013 by Clive One
Hi everyone!! I'm working on my very first project as engineer with a friend and colleague. We bought th eval board with the f4 and f100 series microcontroller on. We tested our code on both of them and everything's fine. As soon sketched and produced our board and soldered all the components we're not having the stm32f103c8t6 (the same family of the one on the f100 eval board) working on the USART. The other internal and external peripherals are working and we checked for errors or cc on the board or solders.
So we were wondering about if a external crystal oscillator is needed, any other ideas??