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串口c程序接收数据长度总是为0
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#define _CRT_SECURE_NO_WARNINGS
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#include+ M9 z X; A# c% \, X; G5 A
#include "tchar.h"
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; ]- ^2 G4 u: U#include
$ R9 i0 L7 T, d7 d- j- f1 h#include. \5 h- R7 @# J5 A: C2 p, p4 Q* Y3 _
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9 p7 K! o. k% P9 F6 _9 _int mAIn()
( f" S+ E! x5 {{
' f! X* ]! \# @. O HANDLE hCom1;. v2 D2 t( ~, f j {- f, g
COMMtiMEOUTS TimeOuts; ) a! s" w, l" G0 h$ G
DCB dcb1;
6 ~) ?( a+ ?: n DWORD i ;
% w1 C7 i: [5 p: M4 r$ p/ O DWORD wCount =4;! @% m+ K% [- M3 C$ T
DWORD wCount1;
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, ~' g3 I6 z* P& ^5 ?1 R, G unsigned char str[8];4 A0 `1 y) X' R! }" A
8 X6 a5 V# |, `% V7 } hCom1 = CreateFile("COM4",
& J; g" U2 [% r/ T- y1 ~8 E. H GENERIC_READ | GENERIC_WRITE,
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NULL,3 t0 G; d2 ^* y+ r
OPEN_EXISTING,* u3 d! \ c" j1 j. f! F
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NULL);2 U) _9 J* P/ ]$ @
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- x& g/ q% L7 F1 V7 A% M6 R* w if (hCom1==INVALID_HANDLE_VALUE )6 ?0 \* F2 f1 a" H( z* X6 `8 |9 |
{
. a: f% y: t' H: o printf("read open failed\n");6 B6 ]: u. q- b( U% Q9 F; x
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else. S* n4 P7 e: {3 l1 f
{
/ O- r+ e0 Y# |$ L5 S. H+ c printf("read open successed\n");) k# {8 s1 E9 }9 _" K& ?) B l
}
3 o) |( L+ V8 Y! f# I, l/ G- z" } SetupComm(hCom1, 20480, 20480);
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//COMMTIMEOUTS TimeOuts; ) }- A+ c. _6 B9 P
TimeOuts.ReadIntervalTimeout =100;
9 y+ i$ _* E- e6 _! m/ I9 z TimeOuts.ReadTotalTimeoutMultiplier =500;0 G1 Q& V/ j/ Q; v$ j
TimeOuts.ReadTotalTimeoutConstant = 5000;
9 g3 S5 ?2 d- S8 S TimeOuts.WriteTotalTimeoutMultiplier = 500;
+ Y- q$ x/ l' V$ B, N% c/ E TimeOuts.WriteTotalTimeoutConstant = 2000;2 G2 Y, O7 N) g. R% I
SetCommTimeouts(hCom1, &TimeOuts);5 T4 l7 [( E# [1 c* H* i5 V
* v/ z1 f( H: e1 K4 n! t' Y; ` k2 s //DCB dcb1;
( ?, @1 ?* ]3 c* I- o GetCommState(hCom1, &dcb1);
5 H' H! N4 @; b6 N0 b/ v: q% k dcb1.BaudRate = 115200;
. D+ b9 H6 f* F/ n6 T dcb1.ByteSize = 8;//一个字节8bit
9 t- v! Z; z3 f- t3 S dcb1.Parity = NOPARITY;//无校验
# m4 q8 O! I* U9 L dcb1.StopBits = ONESTOPBIT;//1位停止位$ P+ k2 A5 @ O8 t+ l
dcb1.fParity = FALSE;) b) Z% q/ L1 e5 K' q
dcb1.fNull = FALSE;
% v" D5 g3 z8 H/ p6 I0 X SetCommState(hCom1, &dcb1);6 g1 Q3 E7 Y( |8 f9 Z" p- _
0 N. U+ H- X1 q PurgeComm(hCom1, PURGE_TXCLEAR|PURGE_RXCLEAR);
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if(!ReadFile(hCom1, str, wCount, &wCount1, NULL))
, Q( J3 ` O3 P7 a {
: t3 ]5 m3 I7 c v6 V7 P printf("read failed!");
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else
/ i1 P" C! P% J2 G" ^ {
4 x$ G1 e9 B+ k% P* I/ }$ c# c printf("read successed!");
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$ Z9 i3 O5 h3 o4 C4 M% X `9 Y+ Y printf("wCount1:%d\n", wCount1);6 V) M; g. }2 X( u& R2 D& p( s
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printf("read data is");( o; N% J1 n; X! X% r
for(i=0;i {
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; T* ]7 |, l( L# m" C3 \7 n: m printf("%02X", str);
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CloseHandle(hCom1);2 d2 w. R+ _7 w
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// system("pause");
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* S2 Q2 l* f8 u}
8 r: t. h8 n# b! x) i代码贴上来了，wCount1总是为0，不知道哪里出了问题，有没有大佬帮忙看下，感谢。 |
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发表于 2023-1-31 09:36
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