Software UART 程序设计指引.docx

Software UART 程序设计指引.docx

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SoftwareUART程序设计指引

概述：

SoftUART需要一个标准的输出口和一个标准的外部中断输入口。

数据的传输需要一个8位定时器产生对应波特率的1个bit和1/2个bit时间。

传输和接收数据的格式包含一个起始位、数据位、停止位和校验位。

SoftwareUART需要以下的资源：

ØOutputportforTx

ØInputportforRx（下降沿触发的中断输入口）

Ø8-bittimercontrolregisters

波特率的设置：

软件UART使用一个8位定时器设置波特率，每一个BIT的时间计算为1,000,000/波特率，例如对应于9600的波特率，每一个BIT的时间为1,000,000/9600=104.1667us

范例程序：

下面的程序示例了一个SOFTUART的功能。

程序起始时调用了一个初始化程序来设置输入输出口和8位定时器

流程图：

;****************************************

;MiDeaAirConditionerUART

;AssembledbyRA78K0Slanguage

;Filename:

SoftwareUART.asm

;Date:

;****************************************

$PROCESSOR（9166）

$INCLUDE（Header.inc）

;========================================

;public&externalvariabledefinesegment

;========================================

publicP_UartInit;

;publicP_UartReceive;UARTcommunicationreceivesubroutine

;publicP_UartSend;UARTcommunicationtransmitsubroutine

publicINTP2;

publicINTTM82

publicT_TranTim;

publicV_RxData

publicV_RecAddress

publicV_TraAddress

publicV_BitNum

publicCommTime

publicF_TransFG;

publicF_ReceiFG

extrnV_ModeRun;

extrnV_ModeRunB

extrnV_ModeSet;

extrnV_FanSet

extrnV_KeyData

extrnV_PowerLevel;

extrnV_TempD;

extrnT_05HZ;

extbitF_Commerror;

extbitF_MachineA;

extbitF_TranTim

extbitF_TAAlarm

extbitF_TEAlarm

extbitF_TEHighPro

extbitF_TEHighPro1

extbitF_TELowPro

extbitF_RatingTest;

extbitF_RateTest;

extbitF_CompMin3

extbitF_Defrost;

extbitF_Comp;

extbitF_OutAlarm;

extbitF_ForceCool;

extbitF_Auto

extbitF_BackOil;

extbitF_ModeError;

extbitF_Single;

extbitF_Buzzer;

extbitF_SystemOn;

extbitF_PowerUp

;extbitF_NoForce

;========================================

;Equates

;Bittimeofsomebaudratesbasedonfx=4.19MHz

;Counterresolution

;========================================

BitTime_BaudRate400equ82;

HBtTime_BaudRate400equ41;

TxDataPDirequPM3.1;TXdatadir

RxDataPDirequPM3.2;RXdatadir

;========================================

;bitsegmentDEFINE

;========================================

BITSBSEG;

F_ReceiFGdbit;

F_TransFGdbit;

F_BitStaFgdbit;

;========================================

;datasegmentDEFINE

;========================================

DATA3DSEGSADDRP

V_RecAddress:

ds2

V_TraAddress:

ds2

;----------------------------------------

DATS0DSEGSADDRP

RecBuf0:

ds1;UARTreceivedatabuffer

RecBuf1:

ds1

RecBuf2:

ds1

RecBuf3:

ds1

RecBuf4:

ds1

RecBuf5:

ds1

RecBuf6:

ds1

RecBuf7:

ds1

RecBuf8:

ds1

RecBuf9:

ds1

RecBuf10:

ds1

TraBuf0:

ds1;UARTtransmitdatabuffer

TraBuf1:

ds1

TraBuf2:

ds1

TraBuf3:

ds1

TraBuf4:

ds1

TraBuf5:

ds1

TraBuf6:

ds1

TraBuf7:

ds1

TraBuf8:

ds1

TraBuf9:

ds1

TraBuf10:

ds1

V_RxData:

ds1

V_BitNum:

ds1

T_TranTim:

ds1;UARTcommunicationtimervariable

CommTime:

ds1;transmittimecounter

OutParAdr:

ds1;outdoorparametertableaddress

V_Verify:

ds1

;----------------------------------------

UARTPROCSEG

;========================================

;Modulename:

P_UartInit

;

;DESCRIPTION:

;.ThismoduleistoinitializeUARTcontrolandmode

;registers.

;

;OPERATION:

;.SetdualportstoinputforRxandoutputforTx

;andlatchtheTxporttohigh.

;.Dataformat:

;.1startbit,8-bitdata,2stopbits,noparitybit.

;.Setbaudrateto400.

;.EnableRxandTxoperation.

;.Clearallvariablesandflagsforserialdatatransfer.

;========================================

P_UartInit:

set1RxDataPDir;Inputdirection

clr1TxDataPDir;Outputdirection

set1Pt_TxD20;Settohigh

;\\

set1pmk2;

movintm0,#00100000b;settheINTP2fallingedge

clr1pif2;enableINTP2interrupt

clr1pmk2;

;\\

clr1tce82;

clr1tmmk82;

clr1F_BitStaFg;

movwax,#RecBuf0;

movwV_RecAddress,ax;

ret;

;========================================

;

;========================================

INTP2:

btF_BitStaFg,$INTP2Rt;

clr1tce82;

movtmc82,#00000010b;32.7KHZ

movCR82,#HBtTime_BaudRate400;waitforhalfabittime

set1tce82;enabletmc82operation

INTP2Rt:

reti;

;========================================

INTTM82:

di;

pushpsw;

pushax;

pushbc;

pushde;

pushhl;

bfF_TransFG,$ReceivePro;

brTransPro;

;----------------------------------------

ReceivePro:

btF_BitStaFg,$Rxlp;

bfPt_RxD20,$BitSta;

clr1tce82;disabletmc82operation

brINTTM82Rt;

;

BitSta:

set1F_BitStaFg;

set1pmk2;

movV_BitNum,#0;

movV_RxData,#0;

movCR82,#BitTime_BaudRate400;

brINTTM82Rt;

;----------------------------------------

Rxlp:

incV_BitNum;

cmpV_BitNum,#9;

bnc$rxVerifyBit

clr1cy;

bfPt_RxD20,$rx10;

set1cy;

rx10:

mova,V_RxData;

rorca,1;

movV_RxData,a;

brINTTM82Rt;

;----------------------------------------

rxVerifyBit:

cmpV_BitNum,#10;

bnc$rxStopBit;

brINTTM82Rt;

;----------------------------------------

rxStopBit:

cmpV_BitNum,#11;

bnc$rxStopBit2;

rxStopBit1:

bfPt_RxD20,$RecError;

brINTTM82Rt;

rxStopBit2:

btPt_RxD20,$SRecProc;

RecError:

clr1F_BitStaFg;

clr1pif2;

clr1pmk2;

movRecBuf0,#0;

movwax,#RecBuf0;

movwV_RecAddress,ax;

brINTTM82Rt;

;----------------------------------------

SRecProc:

clr1F_BitStaFg;

clr1pif2;

clr1pmk2;

movwax,V_RecAddress;

movwhl,ax;

mova,V_RxData;

mov[hl],a;

incwhl;

movwax,hl;

movwV_RecAddress,ax;

cmpwax,#RecBuf1;

bnz$SRecEnd;

cmpRecBuf0,#0f0h;

bz$SRecEnd;

brRecError

SRecEnd:

movwax,V_RecAddress;

cmpwax,#RecBuf10;

bnc$SRecEnd1;

brINTTM82Rt;

SRecEnd1:

movwax,#RecBuf0;

movwV_RecAddress,ax;

set1F_ReceiFG;

brINTTM82Rt;

;========================================

TransPro:

incV_BitNum;

cmpV_BitNum,#12;

bc$TxBit;

;----------------------------------------

TxByte:

movV_BitNum,#0;

movwax,V_TraAddress;

movwhl,ax;

mova,[hl];

movV_RxData,a;

incwhl;

movwax,hl;

movwV_TraAddress,ax;

cmpwax,#TraBuf10;

bc$TraStart;

bz$TraStart;

movwax,#0;

movwV_TraAddress,ax;

clr1F_TransFG;

clr1tce82;

clr1F_BitStaFg;

clr1pif2;

clr1pmk2;

brINTTM82Rt;

TraStart:

clr1Pt_TxD20;

movV_Verify,#0;

movCR82,#BitTime_BaudRate400;

brINTTM82Rt;

;----------------------------------------

TxBit:

cmpV_BitNum,#9;

bnc$TxVerify;

clr1cy;

mova,V_RxData;

rorca,1;

movV_RxData,a;

bc$TxBit1;

clr1Pt_TxD20;

brTxBit2;

TxBit1:

set1Pt_TxD20;

TxBit2:

addcV_Verify,#0;

brINTTM82Rt;

;----------------------------------------

TxVerify:

cmpV_BitNum,#10;

bnc$TxStop;

clr1cy;

mova,V_Verify;

rorca,1;

bc$TxVerify1;

set1Pt_TxD20;

brINTTM82Rt;

TxVerify1:

clr1Pt_TxD20;

brINTTM82Rt;

;----------------------------------------

TxStop:

cmpV_BitNum,#11;

bnc$TxStop1;

set1Pt_TxD20;

brINTTM82Rt;

TxStop1:

set1Pt_TxD20;

INTTM82Rt:

pophl;

popde;

popbc;

popax;

poppsw;

ei;

reti;

;========================================

;

;========================================

P_UartReceive:

btF_ReceiFG,$CommCheck;

cmpCommTime,#120;2min通讯保护

bnc$CommError;

ret;

CommError:

set1F_Commerror;

movCommTime,#0;

movRecBuf0,#0;

movRecBuf1,#0;

movRecBuf2,#0;

movRecBuf3,#0;

movRecBuf4,#0;

movRecBuf5,#0;

movRecBuf6,#0;

movRecBuf7,#0;

movRecBuf8,#0;

movRecBuf9,#0;

movTraBuf0,#0;

movTraBuf1,#0;

movTraBuf2,#0;

movTraBuf3,#0;

movTraBuf4,#0;

movTraBuf5,#0;

movTraBuf6,#0;

movTraBuf7,#0;

movTraBuf8,#0;

movTraBuf9,#0;

call!

P_UartInit;

ret;

CommCheck:

clr1F_ReceiFG;

;----------------------------------------

cmpRecBuf0,#0f0h;

bz$ByteTwo;

ret;

ByteTwo:

cmpRecBuf1,#00h;

bz$CheckSum;

ret;

CheckSum:

movb,#9;

movwhl,#RecBuf0;

CALL!

P_CalParaSum1;

cmpa,RecBuf9;

bz$ReceiveOk;

ret;

;----------------------------------------

ReceiveOk:

clr1tce82;

set1pmk2;

clr1F_Commerror;

movCommTime,#0;

set1F_TranTim;

movT_TranTim,#0;

;----------------------------------------\\接收解码

cmpRecBuf2,#0;

bnz$HeatMod;

movV_ModeRunB,#C_ModeOff;

brTempDCheck;

HeatMod:

cmpRecBuf2,#1;

BNZ$CoolMod;

movV_ModeRunB,#C_ModeHeat;

brTempDCheck;

CoolMod:

cmpRecBuf2,#2;

bnz$DryMod;

movV_ModeRunB,#C_ModeCool;

brTempDCheck;

DryMod:

cmpRecBuf2,#3;

bnz$FanMod;

movV_ModeRunB,#C_ModeDry;

brTempDCheck;

FanMod:

movV_ModeRunB,#C_ModeFan;

brTempDCheck;

;----------------------------------------

TempDCheck:

mova,RecBuf3;

cmpa,#10;

bnc$TempDCheck10;

adda,#10;

TempDCheck10:

suba,#10;

movV_TempD,a;

;----------------------------------------

mova,RecBuf4;

bta.0,$Symbol01;

clr1F_MachineA;副机

brSymbol10;

Symbol01:

set1F_MachineA;主机

Symbol10:

bta.1,$Symbol11;

clr1F_Defrost;

brSymbol20;

Symbol11:

set1F_Defrost;

Symbol20:

bta.2,$Symbol21;

clr1F_Comp;

brSymbol30;

Symbol21:

set1F_Comp;

Symbol30:

bta.3,$Symbol31;

clr1F_RateTest;

brSymbol40;

Symbol31:

set1F_RateTest;

Symbol40:

bta.5,$Symbol41;

;clr1F_NoForce;

btF_MachineA,$Symbol50;

bfF_ForceCool,$Symbol50;

clr1F_ForceCool;

movV_ModeSet,#C_ModeOff;

movV_FanSet,#C_FanOff;

set1F_Buzzer;

clr1pmk0;

clr1F_SystemOn;

brSymbol50;