RS232原理图

USB转TTL原理图

UART1库函数

void UART1_DeInit(void);
void UART1_Init(uint32_t BaudRate, UART1_WordLength_TypeDef WordLength, 
                UART1_StopBits_TypeDef StopBits, UART1_Parity_TypeDef Parity, 
                UART1_SyncMode_TypeDef SyncMode, UART1_Mode_TypeDef Mode);
void UART1_Cmd(FunctionalState NewState);
void UART1_ITConfig(UART1_IT_TypeDef UART1_IT, FunctionalState NewState);
void UART1_HalfDuplexCmd(FunctionalState NewState);
void UART1_IrDAConfig(UART1_IrDAMode_TypeDef UART1_IrDAMode);
void UART1_IrDACmd(FunctionalState NewState);
void UART1_LINBreakDetectionConfig(UART1_LINBreakDetectionLength_TypeDef   UART1_LINBreakDetectionLength);
void UART1_LINCmd(FunctionalState NewState);
void UART1_SmartCardCmd(FunctionalState NewState);
void UART1_SmartCardNACKCmd(FunctionalState NewState);

UART3库函数

void UART3_DeInit(void);
void UART3_Init(uint32_t BaudRate, UART3_WordLength_TypeDef WordLength, 
                UART3_StopBits_TypeDef StopBits, UART3_Parity_TypeDef Parity, 
                UART3_Mode_TypeDef Mode);
void UART3_Cmd(FunctionalState NewState);
void UART3_ITConfig(UART3_IT_TypeDef UART3_IT, FunctionalState NewState);
void UART3_LINBreakDetectionConfig(UART3_LINBreakDetectionLength_TypeDef UART3_LINBreakDetectionLength);
void UART3_LINConfig(UART3_LinMode_TypeDef UART3_Mode, 
                     UART3_LinAutosync_TypeDef UART3_Autosync, 
                     UART3_LinDivUp_TypeDef UART3_DivUp);
void UART3_LINCmd(FunctionalState NewState);
void UART3_ReceiverWakeUpCmd(FunctionalState NewState);
void UART3_WakeUpConfig( UART3_WakeUp_TypeDef UART3_WakeUp);

UART3库函数

uint8_t UART3_ReceiveData8(void);
uint16_t UART3_ReceiveData9(void);
void UART3_SendData8(uint8_t Data);
void UART3_SendData9(uint16_t Data);
void UART3_SendBreak(void);
void UART3_SetAddress(uint8_t UART3_Address);
FlagStatus UART3_GetFlagStatus(UART3_Flag_TypeDef UART3_FLAG);
void UART3_ClearFlag(UART3_Flag_TypeDef UART3_FLAG);
ITStatus UART3_GetITStatus(UART3_IT_TypeDef UART3_IT);
void UART3_ClearITPendingBit(UART3_IT_TypeDef UART3_IT);

【众拳】剑齿虎STM8开发板的实验代码下载：