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串口c程序接收数据长度总是为0( x: l; j3 k8 t1 I) g) k
# I3 |5 g5 u: d7 N- U F#define _CRT_SECURE_NO_WARNINGS) ^7 H& h( x! Q4 ]- k |9 b! ]* T
#include3 r5 C9 c( B u
#include% ^' j9 v/ [* C8 R* x$ m6 r. B
#include "tchar.h"7 ?6 A/ B; g5 a6 e
7 S. q: m4 m$ D, O+ s* _#include
0 F) u1 x3 v x: Y& ~#include- E* u5 D* r: [
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int mAIn()
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HANDLE hCom1;
( C& Z/ C* C9 L+ s! Q& f9 n COMMtiMEOUTS TimeOuts;
% ]8 F/ o$ j7 a" f3 ]/ x+ J DCB dcb1;% K, V3 b7 f1 Q
DWORD i ;8 d# Q0 Z% i) e
DWORD wCount =4;' A' m* o2 C% G7 Z, s+ {! K
DWORD wCount1;) ^1 W! z4 z. X6 P
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unsigned char str[8];# a. {3 @% T8 i
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hCom1 = CreateFile("COM4",: C4 i( h( ^2 I* S% I! P# J9 a
GENERIC_READ | GENERIC_WRITE,
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3 \2 F( M6 t# Y2 ^$ ~" m3 ~ NULL,
, l5 c$ p; {* L. m7 p) w2 v. S OPEN_EXISTING,
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if (hCom1==INVALID_HANDLE_VALUE )
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- z6 Y) {* O j7 f- w, L: ` printf("read open failed\n");+ n" ?( e3 _ Z8 Y
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; h* z, Q, k" q# N else
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7 S4 f! q) w9 i/ U% T/ k* [ printf("read open successed\n");
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5 a; y2 W+ C u" _: B; W SetupComm(hCom1, 20480, 20480);. c* k/ M) T# e
~" K* }5 Y e: o //COMMTIMEOUTS TimeOuts; 7 H. ^+ }5 @* e+ H x
TimeOuts.ReadIntervalTimeout =100;
/ V; h: p' g, |$ q) q TimeOuts.ReadTotalTimeoutMultiplier =500;
5 R S* Y9 p$ O2 ?) T* @& r& Q TimeOuts.ReadTotalTimeoutConstant = 5000;
0 u* t% P0 x! N TimeOuts.WriteTotalTimeoutMultiplier = 500;
' z+ o8 b7 u2 m' p TimeOuts.WriteTotalTimeoutConstant = 2000;1 b# K. f+ F3 r8 }% w2 A5 g
SetCommTimeouts(hCom1, &TimeOuts);. a3 v! Z7 ^. w4 g8 s. z
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//DCB dcb1;
( W% N( ^: y" C% Y- n3 M& r2 z GetCommState(hCom1, &dcb1);
3 u3 Z3 A3 }; W dcb1.BaudRate = 115200;
6 k+ C' N6 \. z dcb1.ByteSize = 8;//一个字节8bit
4 C( a0 G! E( \1 _ dcb1.Parity = NOPARITY;//无校验
, e, |0 x% {* Y dcb1.StopBits = ONESTOPBIT;//1位停止位& K* i* l* {+ B! R7 z2 L
dcb1.fParity = FALSE;
; ?3 X. Z1 p* t dcb1.fNull = FALSE;9 @$ K) _# \, u! J
SetCommState(hCom1, &dcb1);
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! x: C g3 W8 u PurgeComm(hCom1, PURGE_TXCLEAR|PURGE_RXCLEAR);
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if(!ReadFile(hCom1, str, wCount, &wCount1, NULL))
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printf("read failed!");
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printf("read successed!");! y2 u2 t5 \9 }- t
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% Q8 e1 m; q P, U( | printf("wCount1:%d\n", wCount1);/ H2 Q2 C+ f# U1 N3 a1 [
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printf("read data is");% S% O3 w( A J2 y1 G8 A9 s
for(i=0;i {
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printf("%02X", str);
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}
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" a* c! Y% k, V( J7 A* }CloseHandle(hCom1);" d, [/ m) w% |1 R( E! e r8 D: k
/ Q' z5 e/ k; A, G* i, k. [: v// system("pause");
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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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