我有以下C程序：

#include

#include

#include

int main()

{

int fd = open("/dev/ttyS0",O_RDWR | O_NOCTTY | O_NONBLOCK);

if(fd < 0)

{

perror("Could not open device");

}

printf("Device opened\n");

struct termios options;

tcgetattr(fd,&options);

cfmakeraw(&options);

cfsetispeed(&options,B19200);

cfsetospeed(&options,B19200);

tcsetattr(fd,TCSANOW,&options);

char txpacket[] = {0x23,0x06,0x00,0xdd,0xf9};

ssize_t written = write(fd,txpacket,sizeof(txpacket));

printf("Written %d bytes\n",written);

printf("Starting to wait for target to respond\n");

while(1)

{

fd_set readset;

FD_ZERO(&readset);

FD_SET(fd,&readset);

int nCount = select(fd + 1,&readset,NULL,NULL);

if(nCount > 0)

{

if(FD_ISSET(fd,&readset))

{

int i;

char buffer[128];

ssize_t bytesread = read(fd,buffer,sizeof(buffer));

printf("Received %d bytes\n",bytesread);

for(i = 0; i < bytesread; i++)

{

printf(" %02x",buffer[i]);

}

}

}

}

}

該程序打開串行設備/ dev / ttyS0,向其寫入一系列數據并開始監聽響應.我得到以下輸出：

Device opened

Written 6 bytes

Starting to wait for target to respond

Received 0 bytes

Received 0 bytes

Received 0 bytes

Received 0 bytes

Received 0 bytes

Received 0 bytes

...

并且該應用程序消耗100％的cpu.即使目標硬件實際傳輸它,我也無法接收任何數據.

怎么了？

總結

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