Dear all:
I am confuse recently. When I use uart to send my command and I use PC to receive data(PS: I have used converter to change TTL voltage to RS232 voltage).Because this part code will be used many times in program(in a loop).the data is correct most of time. but there are still some error data inside . But I have checked the data in the send buffer of my code is correct, But the data that I received is error. who can help me ?
code:
fwrite((pointer)Trans_buffer,sizeof(unsigned char),lenth,upload_dev);
fflush(upload_dev);
ioctl( upload_dev, IO_IOCTL_SERIAL_WAIT_FOR_TC, NULL );
I use these three line code to send data
Trans_buffer : the data in this buffer is always correct.
example of my data :
77 10 80 00 00 77 12 80 00 00 77 14 80 00 00 77 16 80 00 00 77 18 80 00 00 77 1A 80 00 00
77 1C 80 00 00 77 1E 80 00 00 77 20 80 00 00 77 22 80 00 00 77 24 80 00 00 77 26 80 00 00
77 28 80 00 00 77 2A 80 00 00 77 2C 80 00 00 77 2E 80 00 00 77 30 80 00 00 77 80 32 00 00
77 34 80 00 00 77 36 80 00 00 77 38 80 00 00 77 3A 80 00 00 77 3C 80 00 00 77 3E 80 00 00
77 40 80 00 00 77 42 80 00 00 77 44 80 00 00 77 46 80 00 00
The red data is error, we can find the second data and the third data exchanged their place.
I dont know how to solve this problem.
the data send to PC through a voltage converter and Serial port to USB port line ( PIN:TX RX GND )
