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串口c程序接收数据长度总是为0! L( Y1 Z4 a2 s* ]4 t
9 [. C4 B' w. q; _& @5 Z#define _CRT_SECURE_NO_WARNINGS5 k/ D7 J" A+ v
#include
' k$ S* e4 q. h#include" k8 o4 i) G' J$ i+ i; n
#include "tchar.h"- w/ n5 K/ X. j- [9 G- v4 E4 L
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#include, m' x# O. @6 ?+ A, h6 c, o2 O
#include
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int mAIn()
0 M M- J; ]8 S' q9 d# Y{
8 M) S8 ^% b" D+ h HANDLE hCom1;
; @+ w# m% y5 A. _: b& _' o' s COMMtiMEOUTS TimeOuts;
$ a2 F) D, M# T+ u6 I0 s$ ~2 n DCB dcb1;
+ _5 B0 d' U6 D DWORD i ;
9 p" Y; }6 I) ]" | DWORD wCount =4;
/ M$ \& \& Y; l* b DWORD wCount1;) i: i" k$ [, u: F
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& Q! j, x" ` r" O3 {
unsigned char str[8];
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3 c$ G$ M; Q Z: D hCom1 = CreateFile("COM4",- h; _9 I7 C* R G! s) F
GENERIC_READ | GENERIC_WRITE," w9 c' X7 E$ o9 w E
0,
) X2 t7 J2 V i" ?$ s. w NULL,
# T8 z" g! K; ~/ `7 `8 Y OPEN_EXISTING,2 N# k0 a( H$ B
0,, k2 R8 E; R2 z+ g! v9 r2 |
NULL);' r9 @ Q9 T. b" O
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if (hCom1==INVALID_HANDLE_VALUE )
) K I: j( V2 }7 J& U {
7 f/ b& t5 q9 Y# U. b printf("read open failed\n");& |, Z& Y' |# A; I
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else3 d' C/ }0 C& Y; Z$ u
{
$ H" a, P# `8 O2 c; V- C- y printf("read open successed\n");5 e( _. Q, s. M( D" D6 y
}
4 ~2 x3 _* \# g) x! d# {# x SetupComm(hCom1, 20480, 20480);
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//COMMTIMEOUTS TimeOuts;
% }$ x/ A# J8 v/ S/ {, | TimeOuts.ReadIntervalTimeout =100;: I/ C! W0 \! k) Z( h
TimeOuts.ReadTotalTimeoutMultiplier =500;2 [! a- Y/ T, p, _4 A$ `
TimeOuts.ReadTotalTimeoutConstant = 5000; ' V: I" F9 k; S. C
TimeOuts.WriteTotalTimeoutMultiplier = 500;
! n& I; v, S3 ?! O- N3 a TimeOuts.WriteTotalTimeoutConstant = 2000;8 F1 }. E: D' O' L" V( |+ R/ {9 x
SetCommTimeouts(hCom1, &TimeOuts);: |; s3 W+ g/ `/ h
/ L5 n9 t6 |* ]; J0 i* D //DCB dcb1;
( A4 p$ c& s8 [9 K8 J6 K GetCommState(hCom1, &dcb1);
& b& E9 f0 _1 K/ z* c ] dcb1.BaudRate = 115200;
' z. N5 {! s7 h* o5 }) E dcb1.ByteSize = 8;//一个字节8bit
0 i% T+ C5 N" F5 s9 C6 z dcb1.Parity = NOPARITY;//无校验
+ Y( P6 r& s: J- ^ dcb1.StopBits = ONESTOPBIT;//1位停止位
$ i5 E0 Z& \4 n7 _. O dcb1.fParity = FALSE; B7 V& n$ H' I" x$ j5 }& _7 ]
dcb1.fNull = FALSE;
. \! a& T. X/ z( Q# x SetCommState(hCom1, &dcb1);: F* E* B7 d# w+ d; L
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PurgeComm(hCom1, PURGE_TXCLEAR|PURGE_RXCLEAR);* b. Z6 x0 b. }( b2 I# S9 ?/ q
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$ ~* z8 {6 \3 ~8 M% [$ K8 A if(!ReadFile(hCom1, str, wCount, &wCount1, NULL)), y( g; h' O$ ^) Q
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printf("read failed!");
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else
6 V9 X8 a, [& ] {
7 ], S: [& r/ L. D) L+ V printf("read successed!"); {1 Z0 h0 c p5 s
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# l3 H" a% C* d6 {* Z$ k# W' ^" L# l printf("wCount1:%d\n", wCount1);- x% c! o* e3 b' P5 v6 h" }7 H
w$ o0 ]) @; V8 u! ?
1 D" S0 @0 v* F" @ printf("read data is");
; I3 l: r" ]. [+ n' \1 m( r' X$ l* r& y for(i=0;i {7 ]7 i- v# _" p# Z
e% U/ {: _% B) \8 A, V% V9 D printf("%02X", str);% z7 r! [+ o7 d! K
}
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, |- P6 S- w- Z8 J& f, SCloseHandle(hCom1);9 t) |5 Q) f( }' O$ k
3 k# {# }& \% q// system("pause");
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7 P- L! u/ t# W v2 |}
1 ^' b+ h V4 l7 Q$ r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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