为了探测Windows串口,我编写了这个程序。我将串口波特率设置为115200 bps。当我运行该程序时,经过的时间是1250毫秒,因此,波特率仅达到102400 bps。我也用类似的程序检查接收波特率,波特率是相同的。
以下是该计划:
char* message =
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
int numBytes = 144;
c0 = clock()
for (;;)
{
sendSerial(&hCom, message, numBytes );
tx +=numBytes;
//14400 bytes * 8 = 115200 bps
if (tx >= 14400)
{
c1 = clock();
runtime_diff_ms = (c1 - c0) * 1000. / CLOCKS_PER_SEC;
printf("Tx frames %d Time ms %f", tx, runtime_diff_ms);
system ("pause");
return -1;
}
}
bool sendSerial(HANDLE *hCom, char *WriteBuffer, DWORD dwBytesToWrite)
{
DWORD dwBytesWritten = 0;
BOOL bErrorFlag = FALSE;
bErrorFlag = WriteFile(
*hCom, // open file handle
WriteBuffer, // start of data to write
dwBytesToWrite, // number of bytes to write
&dwBytesWritten, // number of bytes that were written
NULL);
...
}
这些是我的串口规格:
DCB dcbSerialParams;
COMMTIMEOUTS timeouts;
dcbSerialParams.BaudRate=CBR_115200;
dcbSerialParams.ByteSize=8;
dcbSerialParams.StopBits=ONESTOPBIT;
dcbSerialParams.Parity=NOPARITY;
timeouts.ReadIntervalTimeout=MAXDWORD;
timeouts.ReadTotalTimeoutMultiplier=MAXDWORD;
timeouts.ReadTotalTimeoutConstant=5000; // 5sec
timeouts.WriteTotalTimeoutMultiplier=10;
timeouts.WriteTotalTimeoutConstant=100;
任何人都知道如何解决此问题达到115200 bps?
答案 0 :(得分:5)
每个字符有10位 - 数据为8位加上起始位和停止位。
如果计算每个字符10位的14400个字符应该以115200 bps的速度运行多长时间,那么你得到1250毫秒:
(14400 characters * 10 bits/character) / (115200 bits/second) = 1.250 seconds