STM32F10x 学习笔记6（USART实现串口通讯 2）

时间：11-20 来源：互联网点击：

*/
voidCOMBufferInit(void);
/************************************************************
*function:COMBufferIsEmpty
*parameter:charport,portcanbeCOM1/COM2
*return:char
*usage:Thisfunctioniscalledbyyourapplicationtosee
*ifanycharacterisavailablefromthecommunicationschannel.
*Ifatleastonecharacterisavailable,thefunctionreturns
*FALSE(0)otherwise,thefunctionreturnsTRUE(1).
*changelog:
*************************************************************/
unsignedcharCOMBufferIsEmpty(unsignedcharport);
/************************************************************
*function:COMBufferIsFull
*parameter:charport,portcanbeCOM1/COM2
*return:char
*usage:Thisfunctioniscalledbyyourapplicationtoseeifanymorecharacterscanbeplaced
*intheTxbuffer.Inotherwords,thisfunctionchecktoseeiftheTxbufferisfull.
*Ifthebufferisfull,thefunctionreturnsTRUEotherwise,thefunctionreturnsFALSE.
*changelog:
*************************************************************/
unsignedcharCOMBufferIsFull(unsignedcharport);
#endif

/*
*file:com_buffered.c
*author:LiYuan
*platform:STM32F107
*date:2013-5-5
*version:0.0.1
*description:UARTRingBuffer
**/
#include"stm32f10x_usart.h"
#include"com_buffered.h"
#defineOS_ENTER_CRITICAL()__set_PRIMASK(1)
#defineOS_EXIT_CRITICAL()__set_PRIMASK(0)
/**
*EnablesTransmiterinterrupt.
**/
staticvoidCOMEnableTxInt(unsignedcharport)
{
staticUSART_TypeDef*map[2]={USART1,USART2};
USART_ITConfig(map[port],USART_IT_TXE,ENABLE);
}
/*
*********************************************************************************************************
*DATATYPES
*********************************************************************************************************
*/
typedefstruct{
shortRingBufRxCtr;/*NumberofcharactersintheRxringbuffer*/
unsignedchar*RingBufRxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
unsignedchar*RingBufRxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
unsignedcharRingBufRx[COM_RX_BUF_SIZE];/*Ringbuffercharacterstorage(Rx)*/
shortRingBufTxCtr;/*NumberofcharactersintheTxringbuffer*/
unsignedchar*RingBufTxInPtr;/*Pointertowherenextcharacterwillbeinserted*/
unsignedchar*RingBufTxOutPtr;/*Pointerfromwherenextcharacterwillbeextracted*/
unsignedcharRingBufTx[COM_TX_BUF_SIZE];/*Ringbuffercharacterstorage(Tx)*/
}COM_RING_BUF;
/*
*********************************************************************************************************
*GLOBALVARIABLES
*********************************************************************************************************
*/
COM_RING_BUFCOM1Buf;
COM_RING_BUFCOM2Buf;
/************************************************************
*function:COMGetCharB
*parameter:charport,portcanbeCOM1/COM2
*parameter:char*errisapointertowhereanerrorcodewillbeplaced:
**errissettoCOM_NO_ERRifacharacterisavailable
**errissettoCOM_RX_EMPTYiftheRxbufferisempty
**errissettoCOM_BAD_CHifyouhavespecifiedaninvalidchannel
*return:char
*usage:Thisfunctioniscalledbyyourapplicationtoobtainacharacterfromthecommunications
*channel.
*changelog:
*************************************************************/
unsignedcharCOMGetCharB(unsignedcharport,unsignedchar*err)
{
//unsignedcharcpu_sr;
unsignedcharc;
COM_RING_BUF*pbuf;
switch(port)
{/*Obtainpointertocommunicationschannel*/
caseCOM1:
pbuf=&COM1Buf;
break;
caseCOM2:
pbuf=&COM2Buf;
break;
default:
*err=COM_BAD_CH;
return(0);
}
OS_ENTER_CRITICAL();
if(pbuf->RingBufRxCtr>0)/*Seeifbufferisempty*/
{
pbuf->RingBufRxCtr--;/*No,decrementcharactercount*/
c=*pbuf->RingBufRxOutPtr++;/*Getcharacterfrombuffer*/
if(pbuf->RingBufRxOutPtr==&pbuf->RingBufRx[COM_RX_BUF_SIZE])
{
pbuf->RingBufRxOutPtr=&pbuf->RingBufRx[0];/*WrapOUTpointer*/
}
OS_EXIT_CRITICAL();
*err=COM_NO_ERR;
return(c);
}else{
OS_EXIT_CRITICAL();
*err=COM_RX

上一篇：ARM Cortex-M3 学习笔记(5)
下一篇：如何成功入侵 Linux 服务器

STM32F10xUSAR串口通相关文章：

栏目分类