学习STM32编程USART控制流水灯

　　关键代码usart。c：ifdefGNUCWithGCCRAISONANCE，smallprintf（optionLDLinkerLibrariesSmallprintfsettoYes）callsioputchar（）definePUTCHARPROTOTYPEintioputchar（intch）elsedefinePUTCHARPROTOTYPEintfputc（intch，FILEf）endifGNUCPUTCHARPROTOTYPE｛Placeyourimplementationoffputcheree。g。writeacharactertotheUSARTUSARTSendData（USART1，（uint8t）ch）；Loopuntiltheendoftransmissionwhile（USARTGetFlagStatus（USART1，USARTFLAGTC）RESET）｛｝｝ifUSART1RXENuint8tUSART1RXBuffer〔USARTRXMAX〕｛0｝；uint8tUSART1RXIndex0；uint8tUSART1RXOverFlag0；endifvoidUSART1Init（uint32tbaudRate）｛GPIOInitTypeDefGPIOInitSUSARTInitTypeDefUSARTInitSNVICInitTypeDefNVICInitSRCCAHB1PeriphClockCmd（RCCAHB1PeriphGPIOA，ENABLE）；RCCAPB2PeriphClockCmd（RCCAPB2PeriphUSART1，ENABLE）；GPIOPinAFConfig（GPIOA，GPIOPinSource9，GPIOAFUSART1）；GPIOPinAFConfig（GPIOA，GPIOPinSource10，GPIOAFUSART1）；GPIOInitStructure。GPIOPinGPIOPin9GPIOPin10；GPIOInitStructure。GPIOModeGPIOModeAF；GPIOInitStructure。GPIOOTypeGPIOOTypePP；GPIOInitStructure。GPIOSpeedGPIOFastSGPIOInitStructure。GPIOPuPdGPIOPuPdUP；GPIOInit（GPIOF，GPIOInitStructure）；USARTInitStructure。USARTBaudRatebaudRUSARTInitStructure。USARTWordLengthUSARTWordLength8b；USARTInitStructure。USARTStopBitsUSARTStopBits1；USARTInitStructure。USARTParityUSARTParityNo；USARTInitStructure。USARTHardwareFlowControlUSARTHardwareFlowControlNUSARTInitStructure。USARTModeUSARTModeRxUSARTModeTx；USARTInit（USART1，USARTInitStructure）；USARTCmd（USART1，ENABLE）；ifUSART1RXENUSARTITConfig（USART1，USARTITRXNE，ENABLE）；NVICInitStructure。NVICIRQChannelUSART1IRQn；NVICInitStructure。NVICIRQChannelPreemptionPriority1；NVICInitStructure。NVICIRQChannelSubPriority3；NVICInitStructure。NVICIRQChannelCmdENABLE；NVICInit（NVICInitStructure）；endif｝voidUSART1IRQHandler（void）｛uint8tRif（USARTGetITStatus（USART1，USARTITRXNE）！RESET）｛ResUSART1DR；ResUSARTReceiveData（USART1）；if（USART1RXIndexUSARTRXMAX）｛USART1RXIndex0；｝if（Res！）｛USART1RXBuffer〔USART1RXIndex〕R｝elseif（Res）｛USART1RXBuffer〔USART1RXIndex〕RUSART1RXOverFlag1；｝｝USARTClearFlag（USART1，USARTFLAGRXNE）；｝
　　main。c：LEDWorkModeTypeDefmyLEDWorkModeLEDMODE1；constcharstringMode1〔8〕mode1；constcharstringMode2〔8〕mode2；constcharstringMode3mode3；intmain（void）｛delayinit（168）；LEDInit（）；USART1Init（115200）；printf（SystemStarted！r）；while（1）｛if（USART1RXOverFlag1）｛if（strstr（（constchar）USART1RXBuffer，stringMode1）！NULL）｛printf（Iminmode1！r）；myLEDWorkModeLEDMODE1；｝elseif（strstr（（constchar）USART1RXBuffer，stringMode2）！NULL）｛printf（Iminmode2！r）；myLEDWorkModeLEDMODE2；｝elseif（strstr（（constchar）USART1RXBuffer，stringMode3）！NULL）｛printf（Iminmode3！r）；myLEDWorkModeLEDMODE3；｝USART1RXIndex0；USART1RXOverFlag0；memset（USART1RXBuffer，0，USARTRXMAX）；｝if（myLEDWorkModeLEDMODE1）｛LEDMode1（1000）；｝elseif（myLEDWorkModeLEDMODE2）｛LEDMode2（）；｝elseif（myLEDWorkModeLEDMODE3）｛LEDMode3（）；｝｝｝