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串口c程序接收数据长度总是为04 p1 w+ A* j# k8 I2 m, k
( ? W8 P [5 ?4 _$ ]#define _CRT_SECURE_NO_WARNINGS
m6 a* C# l) A6 ]- I! }* J' b#include
2 s. v/ g: R& q) _#include
3 K3 P3 P% z" U6 _" S& P#include "tchar.h"
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#include
+ d6 \: y# I/ x) |; G {# s) N#include4 @) J; x6 N) ^, U6 X
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int mAIn()( \: F* H# w4 B
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HANDLE hCom1;
4 R! A7 v: q+ n& H, z' U. T" r COMMtiMEOUTS TimeOuts; ! ]* }% p2 F6 `# f: \
DCB dcb1;
% [ |8 X }. G5 ? DWORD i ;
" S: X; ~" X7 \" \, f DWORD wCount =4;0 W, t+ H% b8 o
DWORD wCount1;7 `6 f- i) `# L% G! _. E$ g
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9 {: K% X4 A0 w+ E2 ^8 ` unsigned char str[8];- Q& ?7 a2 f' ?9 c) V; m
- M( `! _4 E; f8 }: z$ I hCom1 = CreateFile("COM4",
! e( V6 ]- c2 p3 ]5 X. V GENERIC_READ | GENERIC_WRITE,$ s$ M4 @; ?+ @7 J
0,
" |& d, ]" a4 ~4 r. u0 S NULL,
* Y7 O3 O! t4 h/ d OPEN_EXISTING,* H! ]$ F$ V; ^( G t3 X: f q% ]& a/ a* l
0,
+ U7 o6 I6 Q ?) E. F( m; \ NULL);7 j9 {1 M$ m/ [* h
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; }" T4 Q6 F3 E @% S7 r if (hCom1==INVALID_HANDLE_VALUE )2 @( I3 u- j0 X; E5 u I, z
{
* F2 F' D5 G( l5 ?2 \4 F printf("read open failed\n");# i) g, [& S$ ~9 `, w# w
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printf("read open successed\n"); f6 S* d1 F" g+ T; l
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SetupComm(hCom1, 20480, 20480);* H3 n$ _- l4 Q* I3 B3 G
! f2 F D6 S& J' A: p3 J //COMMTIMEOUTS TimeOuts; " z5 R5 B7 j% _ w
TimeOuts.ReadIntervalTimeout =100;
7 F2 Z; v ]' }; j6 a; a5 o! K TimeOuts.ReadTotalTimeoutMultiplier =500;. O8 w* |) | I1 R$ w2 Y
TimeOuts.ReadTotalTimeoutConstant = 5000; $ M4 a: O; [* P& d6 {1 s0 t
TimeOuts.WriteTotalTimeoutMultiplier = 500;
, w( B. u# X* `! }! A. Z TimeOuts.WriteTotalTimeoutConstant = 2000;0 n% f1 M$ D1 b! _3 @) {
SetCommTimeouts(hCom1, &TimeOuts);2 U; W6 I; z" p. V6 v
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//DCB dcb1;
; L1 r' D o6 Q$ b$ L GetCommState(hCom1, &dcb1);' \4 [- R) T5 F; {7 j
dcb1.BaudRate = 115200;
3 i5 Q, G4 E( Z2 { dcb1.ByteSize = 8;//一个字节8bit
7 r r7 a7 z+ i- K: d" | R dcb1.Parity = NOPARITY;//无校验. H3 {- ]* P2 x+ q9 ]
dcb1.StopBits = ONESTOPBIT;//1位停止位8 Q3 a0 t4 p# Z0 D( ^
dcb1.fParity = FALSE;
: ~( F) d* Q0 T$ _ R dcb1.fNull = FALSE;) W/ H3 w9 P. y x% Z3 G
SetCommState(hCom1, &dcb1);
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PurgeComm(hCom1, PURGE_TXCLEAR|PURGE_RXCLEAR);. k6 c2 A1 t/ ^" o7 q
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6 J5 j- ^' D6 @ if(!ReadFile(hCom1, str, wCount, &wCount1, NULL))
, h5 ~; O0 M6 i) \- I+ x( o' l" M {
" ^8 U0 M1 V, X q# u; y. b printf("read failed!");
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else, Z, U2 m7 B1 I
{
+ {- V0 B+ e( p; M9 F printf("read successed!");
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3 j( ^& ]+ q, |9 T* X printf("wCount1:%d\n", wCount1);& P T1 [- u3 ]+ T. I3 I
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0 Z( s$ {" Q* Q } @ printf("read data is");6 h: o! b9 m) J) x8 ^: r
for(i=0;i {
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printf("%02X", str); i, `+ E9 U/ y$ t1 Y2 \
}
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CloseHandle(hCom1);
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// system("pause");
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}
' d5 u( W. `8 j; f. v' E# D. u. [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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