Usart3Init(void); uint8_t Usart3IsReady(void); void Usart3DmaSend(uint8_t *data_buf, uint16_t lengh); void Usart_SendStr_length( USART_TypeDef * pUSARTx, uint8_t *str,uint32_t strlen ); void Usart_SendString( USART_TypeDef * pUSARTx, uint8_t *str); #endif /* __USART3_H...