簡易連線uart的程式

本來是想要把minicom搬到android上，不過他的source code很多，也蠻複雜的，
後來在網路上找到tick_minicom，只有幾個檔案，應該很容易讓他編進android

tick_minicom：簡單的uart程式
http://linuxocarina.blogspot.com/2007/09/minicom.html

不過我的連線設定跟他不一樣，所以參考以下網站對程式做了一些修改之後就可以使用了
http://book.51cto.com/art/200711/59758.htm

int
set_baud (int fd, int rate)
{
 int i, rt;

 u_int32_t bd = 0;

 struct termios ti;

 //select baudrate
 for (i = 0; i < ARRAY_SIZE (bdrts); i++) {
  if (bdrts[i].bps == rate) {
   bd = bdrts[i].b;
   debug("select baudrate: %d\n",rate);
   break;
  }
 }
 if (bd == 0) {
  error ("Cannot set Baud Rate!!\n");
  return -1;
 }

 //set baudrate
 rt = tcgetattr (fd, &ti);
 if (rt < 0) {
  error ("Cannot get attr i=%d\n", rt);
  return rt;
 }

 debug ("Open uart input with speed %d\n", bdrts[i].bps);
 //rt = cfsetispeed (&ti, B0);
 rt = cfsetispeed (&ti, bd);
 if (rt < 0) {
  //error ("Cannot set input baud to B0!!\n");
  error ("Cannot set input baud to bd!!\n");
  return rt;
 }

 debug ("Open uart output with speed %d\n", bdrts[i].bps);
 rt = cfsetospeed (&ti, bd);
 if (rt < 0) {
  error ("Cannot set baud rate %d\n", bdrts[i].bps);
  return rt;
 }

 rt=tcsetattr (fd, 0, &ti);
 if(rt<0){
  return rt;
 }

 //set no hareware conrtol
 rt = tcgetattr (fd, &ti);
 //ti.c_cflag |= CRTSCTS; // hardware control
 ti.c_cflag &= ~CRTSCTS;  // no hardware control
 rt=tcsetattr (fd, 0, &ti);
 if(rt<0){
  return rt;
 }


 //set databit:8
 rt = tcgetattr (fd, &ti);
 ti.c_cflag&=~CSIZE;
 ti.c_cflag |=CS8;
 rt=tcsetattr (fd, 0, &ti);
 if(rt<0){
  return rt;
 }


 //set no parity bit
 rt = tcgetattr (fd, &ti);
 ti.c_cflag &= ~PARENB;
 rt=tcsetattr (fd, 0, &ti);
 if(rt<0){
  return rt;
 }


 return rt;
}