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項(xiàng)目需要用MSComm控件實(shí)現(xiàn)射頻設(shè)備與PC的串口通信。先說一下設(shè)備發(fā)送命令后會(huì)返回的相應(yīng)的數(shù)據(jù):+ G5 M6 j/ S8 F) f; O1 X
! e. m9 Z' }) V: _* j: j當(dāng)發(fā)送命令"H!i"時(shí),為尋找芯片。
( H: {% P# {% [0 w當(dāng)設(shè)備連接正確又無芯片在感應(yīng)區(qū)時(shí),設(shè)備循環(huán)返回:0630 和 1537
2 \9 W ?7 e% v0 ?1 J! D y1 \! W當(dāng)設(shè)備當(dāng)設(shè)備連接正確而芯片又在感應(yīng)區(qū)時(shí),設(shè)備返回0630,稍有停頓,繼續(xù)返回4831+其他信息8 ?6 {% m4 p3 X; s3 n- d
2 B6 I% z+ T4 o, k. K, ^$ E當(dāng)芯片在感應(yīng)區(qū)時(shí),發(fā)送命令“R00000016U”,讀取芯片前十六字節(jié)數(shù)據(jù)) H5 x( s' @* j. U) A0 A
沒有錯(cuò)誤時(shí),設(shè)備返回:06307 d! |" X. ^& A5 e
此時(shí),發(fā)送命令“STX”,或十六進(jìn)制命令“02”
% L1 ^/ ~- C5 n4 s$ E設(shè)備返回前十六字節(jié)數(shù)據(jù)
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之后繼續(xù)發(fā)送命令“H!i”,尋找下一個(gè)芯片2 P* ], f4 ^) }' K& S
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( ]" \1 ~' z* u# p項(xiàng)目用MSComm進(jìn)行串口通信
_/ ^+ Y% l, Q# }需要將上述幾條命令循環(huán)起來。我用的是比較MSComm1.Input是否為爭(zhēng)取的返回值“4831”和“0630”。5 x2 o! F; \- U4 b4 R
用了三個(gè)timer來控制三條命令“H!i”、“R00000016U”和“STX”的發(fā)送。把發(fā)送命令都放在了timer_timer下。
5 A% Z+ h; V" i" u- ^% l4 |. e; k但是這樣的話,就用到了三個(gè)Private Sub MSComm1_oncomm()。系統(tǒng)報(bào)錯(cuò),“發(fā)現(xiàn)二義性名稱”。意思應(yīng)該是不能重復(fù)定義Private Sub MSComm1_oncomm()吧?) u$ i K4 k: }7 S
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, Y5 j% c3 E* V其實(shí)程序說簡(jiǎn)單些就是:7 B9 R# n9 e E. I5 L* v6 I2 ^, C
發(fā)送命令—>從數(shù)據(jù)返回區(qū)判定->發(fā)送命令->數(shù)據(jù)返回區(qū)判定->再發(fā)送命令->接收數(shù)據(jù)* }+ i+ e" r4 q7 j$ T
這個(gè)循環(huán)要怎么實(shí)現(xiàn)呢?4 a" K6 U+ t+ O# _& R! f- f7 o
先謝謝各位!
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& x2 t: N _# j2 f--------------------------------------------------------------------
+ R+ S+ \" j" V1 w$ A0 J; G下面是循環(huán)部分的代碼。系統(tǒng)報(bào)錯(cuò)
0 l, ~3 x/ ~! z( K' s+ ?Private Sub cmdStart_click(), U) `; u: P- v7 r: p: t: `$ K' \
Timer1.Enabled = True
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# _3 U, U+ J5 O- Z1 ~: h& DEnd Sub4 f& m+ B# [& H+ @/ \+ i
Private Sub timer1_timer()
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6 ~" M: r% _+ e: ]0 ~ MSComm1.OutBufferCount = 0 '先清空緩存, u9 \ z t1 W, v1 G
sendbuffer = "H!i"
?$ C$ X+ N$ E6 y6 N MSComm1.Output = sendbuffer
, g2 J; Z8 l3 J8 w5 N0 MEnd Sub1 P& h! h1 U% f( `2 i
'結(jié)束
9 |0 V& k( o+ m# Y9 L+ K$ Y' gPrivate Sub cmdStop_click()4 d) l3 ]& K( R- C& }
Timer1.Enabled = False
) ^+ v( M/ Q3 J Timer2.Enabled = False& u; ^" T0 d c9 K
Timer3.Enabled = False! L2 ^4 G3 F8 V* B
End Sub
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: B3 B' W6 a8 ]+ R; y'接收數(shù)據(jù); s6 X: f, |1 c+ j- r7 y! B S
Private Sub MSComm1_oncomm()
; I$ T5 ]6 }7 S8 i, d3 i Dim inbyte() As Byte
, B; E- f, ^% L& j Dim revbuffer As String
8 L8 ]: `9 E$ G: c1 s7 e Dim a, i, b
* X+ ?( O& X! A" w Select Case MSComm1.CommEvent2 |$ T) y. f3 H" q4 ^1 h( m5 V T
'如果有CT在感應(yīng)區(qū)9 e6 t0 [* P% L+ @3 C# o% B% i
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Case comEvReceive
5 M1 A2 d r4 l4 b) q V5 H inbyte = MSComm1.Input1 V; j4 x8 r7 {+ E
For i = LBound(inbyte) To UBound(inbyte) '返回?cái)?shù)據(jù)轉(zhuǎn)換為十六進(jìn)制
& r6 q# S% Q7 ]+ V+ D9 E; K" Z5 |* n revbuffer = revbuffer + Hex(inbyte(i))
$ L u5 c8 o; h Next i
+ N: y! B% _- P txtHex.Text = revbuffer: L8 d( q, O7 G& i4 z
If Mid(revbuffer, 1, 6) = "480310" Then1 q L% V F K4 w9 C ]- j
Timer1.Enabled = False$ R2 x+ }/ ^7 h/ c$ o2 d+ N
Timer1.Enabled = True
$ h3 @/ C8 }# ]$ E# _; f End If
+ u! z4 Y* a9 Y2 N End Select
6 ^4 b7 R% Q' s' R- q Case comEvSend
3 n% O5 J) o( y" q P2 d) l& s End Select
3 w+ M* \7 w; h9 R/ M# f4 Z! m+ S- gPrivate Sub timer2_timer()3 U+ b$ Y& X0 k! r
MSComm1.OutBufferCount = 0 '先清空緩存
' W* v2 o0 M" n: {* l9 O1 H; P sendbuffer = "R00000016U", B) Y% @1 c# T
MSComm1.Output = sendbuffer [, H& p4 F- j& N9 R0 m
End Sub
$ X& @. w7 K$ W4 Q' z$ C1 s' e' XPrivate Sub MSComm1_oncomm()
& O6 u3 x$ v Y# L# C Select Case MSComm1.CommEvent
4 N" i) W( v, y3 i _ Case comEvReceive1 n/ n/ P0 w0 n# \' U; I+ K3 |
inbyte = MSComm1.Input8 M+ C' V% I; ]8 c/ U6 b' w
For i = LBound(inbyte) To UBound(inbyte) '返回?cái)?shù)據(jù)轉(zhuǎn)換為十六進(jìn)制7 l+ j( A3 o: j+ l/ l
revbuffer = revbuffer + Hex(inbyte(i))( m0 a- \' D: ]6 Y+ A
Next i
5 c( o& G! F% } txtHex.Text = revbuffer$ I. N* E* O* r. B
If Mid(revbuffer, 1, 4) = "6030" Then: U$ O$ ^& Y* `& Y( u
Timer2.Enabled = False m9 V4 |& h1 Z8 k
Timer3.Enabled = True& r d4 w# r# B+ f! }# l' E( C
End If
' ?+ D* C" H) { ?' r& \! k Case comEvSend
* O3 j) X8 [; ^$ ^' D; Z End Select2 i4 i. D) I. F
End Sub
6 t0 s( g3 j- q/ A( yPrivate Sub timer3_timer()
& _0 z2 Z/ ?7 ]# k- ?7 t: D MSComm1.OutBufferCount = 0 '先清空緩存
: g% H( O0 p7 \: L sendbuffer = "STX"( w( f% _& ~- D0 r
MSComm1.Output = sendbuffer
! h: ?& J2 _6 s2 d) i. z7 F0 t& f Select Case MSComm1.CommEvent b$ G( w9 L2 ^ s& B" e
Case comEvReceive
7 V/ O, {* i/ Y j5 f% x" f inbyte = MSComm1.Input
8 T0 y. R! G( ^2 ~. ^2 O For i = LBound(inbyte) To UBound(inbyte) '返回?cái)?shù)據(jù)轉(zhuǎn)換為十六進(jìn)制
V- R& H( j/ L. S3 }, s! k revbuffer = revbuffer + Hex(inbyte(i))
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txtHex.Text = revbuffer* `# ~' o* L6 P$ Z. h1 [9 T
Case comEvSend/ P% R1 {5 _ u/ r1 l
End Select
' c# C% N) H. ^. O( kEnd Sub
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