(完整word版)STM32的485最简单例程

1、485最基本的半双工通信配置采用STM32F103ZET6串口3连接485芯片通信口，485芯片的A,B通过485转串口模块与电脑相连，完成在串口软件上输入输出功能。串口3,配置函数：voidUSART3_Config(void)(GPIO_InitTypeDefGPIO_InitStructure;USART_InitTypeDefUSART_InitStructure;NVIC_InitTypeDefNVIC_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE);RCC_A

2、PB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);/USART3_TX->PB10,USART3_RX>PB11GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOB,&GPIO_InitStructure);GPIO_InitStructure.GPIO_Pin=GPIO_Pin_11;GP

3、IO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_Init(GPIOB,&GPIO_InitStructure);USART_InitStructure.USART_BaudRate=115200;/1200;USART_InitStructure.USART_WordLength=USART_WordLength_8b;USART_InitStructure.USART_StopBits=USART_StopBits_1;USART_

4、InitStructure.USART_Parity=USART_Parity_No;/USART_Parity_Even;USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;USART_Init(USART3,&USART_InitStructure);NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);NVIC_InitSt

5、ructure.NVIC_IRQChannel=USART3_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_Init(&NVIC_InitStructure);#ifdefPDU_USART3_DMAUSART_ITConfig(USART3,USART_IT_IDLE,ENABLE);#else/EnabletheUS

6、ARTReceiveinterrupt:thisinterruptisgeneratedwhenthe/USART3receivedataregisterisnotempty/USART_ClearITPendingBit(USART3,USART_IT_TC);USART_ClearFlag(USART3,USART_FLAG_TC);USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);USART_ITConfig(USART3,USART_IT_TC,ENABLE);/USART_ITConfig(USART3,USART_IT_TXE,ENABLE);

7、USART_ClearFlag(USART3,USART_FLAG_TC);#endifUSART_Cmd(USART3,ENABLE);USART_ClearFlag(USART3,USART_FLAG_TC);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE|RCC_APB2Periph_AFIO,ENABLE);GPIO_InitStructure.GPIO_Pin=GPIO_Pin_15;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed=GPIO_

8、Speed_50MHz;GPIO_Init(GPIOE,&GPIO_InitStructure);RS_485_TX_ENABLE();PUTCHAR_PROTOTYPE/*Placeyourimplementationoffputchere*/*e.g.writeacharactertotheUSART*/USART_SendData(USART3,(uint8_t)ch);/USART_SendData(USART1,(uint8_t)ch);/*Loopuntiltheendoftransmission*/while(USART_GetFlagStatus(USART1,USAR

9、T_FLAG_TC)=RESET)while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)=RESET)returnch;中断函数：voidUSART3_IRQHandler(void)(if(USART_GetITStatus(USART3,USART_IT_IDLE)!=RESET)(USART_ClearITPendingBit(USART3,USART_IT_IDLE);if(USART_GetFlagStatus(USART3,USART_FLAG_RXNE)!=RESET)USART_ClearFlag(USART3,USART_FLAG_R

10、XNE);TIM3_Init(1000,7200);BLUE_ON();if(cnt>=32)cnt=0;elsedatacnt=USART_ReceiveData(USART3);cnt+;if(USART_GetITStatus(USART3,USART_IT_TC)!=RESET)|(USART_GetITStatus(USART3,USART_IT_TXE)!=RESET)USART_ClearITPendingBit(USART3,USART_IT_TC);USART_ClearITPendingBit(USART3,USART_IT_TXE);/USART_SendData(

11、USART3,0XFFFF);voidTIM3_IRQHandler(void)if(TIM_GetITStatus(TIM3,TIM_IT_Update)!=RESET)TIM_ClearITPendingBit(TIM3,TIM_IT_Update);TIM3_DeInit();BLUE_OFF();/printf("rn%x",cnt);cnt=0;staticvoidNVIC_TIM3Configuration(void)(NVIC_InitTypeDefNVIC_InitStructure;/*SettheVectorTablebaseaddressat0x080

12、00000*/NVIC_SetVectorTable(NVIC_VectTab_FLASH,0x0000);/*EnabletheTIM3gloabalInterrupt*/NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;NVIC_Init(&NVIC_

13、InitStructure);定时器：voidTIM3_Init(uint16_ttcon,uint16_tpsc)(TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;/TIM3clockenableRCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);/resettimerTIM_DeInit(TIM3);/Timebaseconfiguration/valuetoreloadTIM_TimeBaseStructure.TIM_Period=(tcon-1);/pre-scalervalueagainst

14、systemclockTIM_TimeBaseStructure.TIM_Prescaler=(psc-1);/scalervalueagainstsystemclockTIM_TimeBaseStructure.TIM_ClockDivision=0;/countingmodeTIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;/inittimerTIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);/ClearTIM3updatependingflagTIM_ClearITPendi

15、ngBit(TIM3,TIM_IT_Update);/TIMITenableofover-countingTIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);/configtimer'sinterruptionfunctionNVIC_TIM3Configuration();/EnableTIM3counterTIM_Cmd(TIM3,ENABLE);voidTIM3_DeInit(void)/DisableTIM3counterTIM_Cmd(TIM3,DISABLE);/ResettimerTIM_DeInit(TIM3);/DisableTIM3clo

16、ckRCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,DISABLE);/tim3_stat=0x00;主函数：#ifdef_GNF_#ifdef_GNUC_/*WithGCC/RAISONANCE,smallprintf(optionLDLinker->Libraries->Smallprintfsetto'Yes')calls_io_putchar()*/#definePUTCHAR_PROTOTYPEint_io_putchar(intch)#else#definePUTCHAR_PROTOTYPEintfputc(intc

17、h,FILE*f)#endif/*_GNUC_*/#endif/*_GNF_*/voidDelay(uint32_ttick)(while(tick-);*/*Privatefunctionprototypes-externunsignedchardatasize;externvolatileunsignedcharcnt;/* FunctionName* Description* Input* Output* Return* Attention:main:Mainprogram:None:None:None:None*/intmain(void)(/*USARTconfiguration*/USART3_Config();RED_ON();BLUE_ON();GREEN_ON();Delay(100000);BLUE_OFF();RED_OFF();