CH343:In Linux system, continuous data transmission, it will loss data

source code: static int set_uart_baudrate(int fd, int baudrate) { struct termios2 tio;

if (ioctl(fd, TCGETS2, &tio)) {
    printf("%s,%d: Error,TCGETS2.\n", __FUNCTION__, __LINE__);
    return -1;
}

tio.c_cflag &= ~CBAUD;
tio.c_cflag |= BOTHER;
tio.c_ispeed = baudrate;
tio.c_ospeed = baudrate;

if (ioctl(fd, TCSETS2, &tio)) {
    printf("%s,%d: Error,TCSETS2.\n", __FUNCTION__, __LINE__);
    return -1;
}

if (ioctl(fd, TCGETS2, &tio)) {
    printf("%s,%d: Error,TCGETS2.\n", __FUNCTION__, __LINE__);
    return -1;
}

return 0;

}

int set_uart_attributes(int fd, int baudrate) { struct termios tty;

// Clear serial port non-blocking mode
//fcntl(fd, F_SETFL, 0);

// Get the current serial port properties
if (tcgetattr(fd, &tty) != 0) {
    perror("tcgetattr");
    close(fd);
    return -1;
}

// Set input and output baud rate
//cfsetospeed(&tty, baudrate);
//cfsetispeed(&tty, baudrate);

// Control mode flag (CLOCAL, CREAD)
tty.c_cflag |= (CLOCAL | CREAD);

// Set the data bits to 8 bits
tty.c_cflag &= ~CSIZE;
tty.c_cflag |= CS8;

// Disable Parity
tty.c_cflag &= ~PARENB;
tty.c_iflag &= ~INPCK;

// Set a stop bit
tty.c_cflag &= ~CSTOPB;

#if 1
// Disable hardware flow control
tty.c_cflag &= ~CRTSCTS;
#else
// Enable hardware flow control
tty.c_cflag |= CRTSCTS;
#endif

// Set to raw mode
//tty.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);

// Disable software flow control
//tty.c_iflag &= ~(IXON | IXOFF | IXANY);

// Set the raw output mode
// tty.c_oflag &= ~OPOST;

// Setting the read timeout
tty.c_cc[VMIN] = 64;
tty.c_cc[VTIME] = 100;

// Setting new properties takes effect immediately
if (tcsetattr(fd, TCSANOW, &tty) != 0) {
    perror("tcsetattr");
    close(fd);
    return -1;
}

set_uart_baudrate(fd, baudrate);

return 0;

}

void test_uart_send_speed(char *pDev,unsigned int baud) { int sendCnt = 0; char Buffer[65] = {0}; char tmpstr[16] = {0}; char c = '0'; int fdser = open(pDev, O_RDWR | O_NOCTTY); int fdusb = open("/media/sda1/usb2uarttest.log", DBG_FILE_MODE); system("echo -n "" > /media/sda1/usb2uarttest.log"); if((fdser!=-1)&&(fdusb!=-1)) { printf("%s,%d:Start Test %s!baud=%d\n", FUNCTION, LINE, pDev,baud); set_uart_attributes(fdser, baud); while(sendCnt<20000) { sendCnt++; memset(Buffer, c++, sizeof(Buffer)); if(c > 'z'){ c = '0'; } Buffer[sizeof(Buffer)-2] = '\n'; Buffer[sizeof(Buffer)-1] = 0; memset(tmpstr, 0, sizeof(tmpstr)); snprintf(tmpstr,sizeof(tmpstr),"<%06d> %d ",sendCnt,strlen(Buffer)); memcpy(Buffer, tmpstr, strlen(tmpstr)); write(fdser, Buffer, strlen(Buffer)); write(fdusb, Buffer, strlen(Buffer)); } close(fdser);
close(fdusb);
}

printf("%s,%d:Test Finished!\n", __FUNCTION__, __LINE__);
while(1)
{
    usleep(5000000);
}

}

char Dev343[] = "/dev/ttyCH343USB0"; char pDevice = Dev343; int main(int argc, charargv[]) { test_uart_send_speed(pDevice, 4000000); }

test result: The data was transmitted with a length of 64 bytes 20,000 times, and data loss occurred 5 times, one of which is shown in the attached picture. loss data as follows:

<009883> 64 iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii <009884> 64 jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj <009885> 64 kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk <009886> 64 lllllllllllllllllllllllllllllllllllllllllllllllllll zzzzzzzzyyy <009900> 64 zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz <009888> 64 nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn <009889> 64 ooooooooooooooooooooooooooooooooooooooooooooooooooo <009890> 64 ppppppppppppppppppppppppppppppppppppppppppppppppppp <009891> 64 qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzzzzzzzzzzzz <009901> 64 000000000000000000000000000000000000000000000000000 <009902> 64 111111111111111111111111111111111111111111111111111 <009903> 64 222222222222222222222222222222222222222222222222222 <009904> 64 333333333333333333333333333333333333333333333333333

WCHSoftGroup / ch343ser_linux

CH343:In Linux system, continuous data transmission, it will loss data #43