我有一个单线串行通信接口,问题是我发送 01010101,我收到的回声是 01010101 的 10 次中有 8 次,但我收到 01110101 的 10 次中有 2 次。
代码示例:
void checkVersion(int fd) {
tcflush(fd, TCIFLUSH);
unsigned char checkVersion[] = {0x55, 0x02, 0x00, 0x02};
int n = write(fd, &checkVersion, 4); //Send data
if (n < 0) cout << "BM: WRITE FAILED" << endl;
char read_bytes[10] = {0};
char c;
int aantalBytes = 0;
bool foundU = false;
int res;
while (aantalBytes < 7) {
res = read(fd, &c, 200);
if (res != 0) {
cout << "Byte received: " << bitset < 8 > (c) << endl;
if (c == 'U')foundU = true;
if (foundU)
read_bytes[aantalBytes++] = c;
}
if (aantalBytes > 2 && !foundU) break;
}
if (!foundU) checkVersionSucceeded = false;
if (read_bytes[aantalBytes - 3] == 0x02 && read_bytes[aantalBytes - 2] == 0x04 && read_bytes[aantalBytes - 1] == 0x06)
cout << "BM Version 4" << endl;
}
我如何配置我的端口:
int configure_port(int fd) // configure the port
{
struct termios port_settings; // structure to store the port settings in
cfsetispeed(&port_settings, B9600); // set baud rates
cfsetospeed(&port_settings, B9600);
port_settings.c_cflag &= ~PARENB; // set no parity, stop bits, data bits
port_settings.c_cflag &= ~CSTOPB;
port_settings.c_cflag &= ~CSIZE;
port_settings.c_cflag |= CS8;
tcsetattr(fd, TCSANOW, &port_settings); // apply the settings to the port
return (fd);
}
问题是什么?回声怎么可能混合了 10 次中的 2 次?