Set up for recording audio with Windows

Here is some set up for recording audio.

0. Use blue line-in jack and green line-out jack

1. Set playback control, especially Volume Control, Wave and Line In, it is ok to mute CDPlayer, PC Beep or SW Synth.


2. Set recording control, select "WaveOut Mix", then we are ready to go.

nfs client

I got an error when mount NFS disks with my OMAP linux box.

rpcbind: server localhost not responding, timed out
RPC: failed to contact local rpcbind server (errno 5).

Here is the result. (The reason is I don't have portmap running in the box)

mount -t nfs -o nolock 192.168.0.9:/tmp /mnt/mmc

And then, I got another panic message, when I run a program.

nfs: server 192.168.0.9 not responding, still trying

Here is the result.

mount -t nfs 192.168.0.9:/tmp /mnt/mmc -o nolock,hard,rsize=1024,wsize=1024

setup dhcp, nfs on FC5

setup dhcp server
I need to setup dhcp server under my router.
Here is the configuration file (/etc/dhcpd.conf)

ddns-updates on;
subnet 192.168.2.0 netmask 255.255.255.0 {
option routers 192.168.2.1;
option subnet-mask 255.255.255.0;
option domain-name "local.net";
option domain-name-servers ns.local.net;
host trgt {
hardware ethernet 08:00:28:01:15:F7;
fixed-address 192.168.2.110;
option root-path "/opt/eldk/ppc_8xx";
option host-name "trgt";
next-server 192.168.2.151;
filename "tftpboot/pImage";
}
}
ddns-update-style ad-hoc;

Here "trgt" is a linux device which has fixed ip address, and need boot image through NFS from linux host with ip "192.168.2.151".

Start dhcp-server with: `/etc/rc.d/init.d/dhcpd start`

Setup nfs

Edit /etc/exports

/tftp 192.168.2.110(rw,no_root_squash,sync)

Edit /etc/hosts.allow

portmap: 10.10.10.20
lockd: 10.10.10.20
mountd: 10.10.10.20
rquotad: 10.10.10.20
statd: 10.10.10.20

And edit /etc/hosts.deny

portmap: ALL
lockd: ALL
mountd: ALL
statd: ALL

run: `exportfs -ra`




scripts on start nfs

/etc/init.d/portmap start
/etc/init.d/nfslock start
/etc/init.d/nfs start
/etc/init.d/netnfs start

Check nfs status with: `/sbin/service nfs status`

rpc.mountd (pid 4181) is running...
nfsd (pid 4183 4182 4181 4180) is running
rpc.rquotead (pid 4170) is running

You may need to "/sbin/service iptables stop" sometimes if you can the ip but can not mount while getting "no route and host" message.

use cu

1. install uucp "sudo apt-get install uucp"
2. edit /etc/uucp/sys

system S0@115200
port serial0_115200
time any

3. edit /etc/uucp/port to add serial0_115200

port serial0_115200
type direct
device /dev/ttyS0
speed 115200
hardflow false

4. Add serial port to VM, otherwise it will not show up.
5. run `cu S0@115200` and get a response "Connected."
To terminate, type `~.`

gnu make on win32 shell

1. The version of gnu make that works on win32 is 3.80, while both 3.78 and 3.81 would not work.

2. win32 shell script. The following is a sample which uses cvs to check out foo source code

@echo off

set PRJ_DIR=%PRJ_ROOT%\foo-%PRJ_TSTAMP%
set PRJ_NAME=foo
if "%1"=="-D" goto check_out_tstamp;

echo "check out HEAD of %PRJ_NAME%"
cvs co -d %PRJ_DIR% -P %PRJ_NAME%

goto end;

: check_out_tstamp
echo "check out with time stamp"
cvs co -D %PRJ_TIME% "-d" %PRJ_DIR% -P %PRJ_NAME%

:end

vim - some tips on use cscope and ctags

1. cscope does not work very well on c++, it is hard to search class members. (so don't expect cscope can do everything)

2. don't use "cscope -b -q" to build the database

3. with ctrl-\ and f, open header file in a c/C++ source code

nmap < C-\>f :cs find f < C-R>=expand("< cword>") . ".h" < CR>< CR> 

4. add database with specification on ignore charactor case.

 cs add cscope.out . -C

5. Here is my build bat file for win32

rm cscope.* tags
set project=c:\work\foo
find %project% -name "*.cpp" -o -name "*.[ch]" > cscope.files
cscope -b
ctags --extra=+q -L cscope.files

utils - ti memory data conversion

The ccs IDE provides a function to save memory data to a file, here is a saved file:

1651 1 10032238 0 300
0x00000000
0x00000000
0x00000000
0x00000000
....

It is a text file, with the first line, contains the memory address, the data length etc. From the next line, comes the data. Since the output is still the text file, I need to convert it to actual binary data. So I develop a little application to do the conversion. Not good on awk, or with sed, I use c programming language directly. C is such powerful.

#include < stdio.h>
#include < string.h>

#define LINE_MAX 256
char my_asc2hex(char a, char b)
{
 char o;
 if (a >= '0' && a <='9') a = a - '0';
 if (a >= 'a' && a <='f') a = a - 'a' + 10;
 if (a >= 'A' && a <='F') a = a - 'A' + 10;
 if (b >= '0' && b <='9') b = b - '0';
 if (b >= 'a' && b <='f') b = b - 'a' + 10;
 if (b >= 'A' && b <='F') b = b - 'A' + 10;
 o = a + b * 16;
 return (o);
}
int main(int argc, char* argv[])
{
 char line_buf[LINE_MAX];
 char* lp;
 FILE* fp, *fp_out;
 char aa,bb,cc,dd;
 
 if (argc < 3){
  printf("%s ti_input_file output_file", argv[0]);
  return 1;
 }

 fp = fopen(argv[1], "r");
 if (fp == NULL) return 1;
 fp_out = fopen(argv[2], "w+b");
 if (fp_out == NULL) {
  fclose(fp); 
  return 1;
 }

 for(;;) {
  lp = fgets(line_buf, LINE_MAX, fp);
  if (lp == NULL) goto main_exit;
  if (*lp++ == '0' && *lp++ == 'x' && strlen(lp) >= 8) {
   aa = my_asc2hex(*lp++, *lp++);
   bb = my_asc2hex(*lp++, *lp++);
   cc = my_asc2hex(*lp++, *lp++);
   dd = my_asc2hex(*lp++, *lp++);
   
   fwrite(&dd, 1, sizeof(char), fp_out);
   fwrite(&cc, 1, sizeof(char), fp_out);
   fwrite(&bb, 1, sizeof(char), fp_out);
   fwrite(&aa, 1, sizeof(char), fp_out);   
  }
 }

main_exit:
 fclose(fp);
 fclose(fp_out);
 return 0;
}

I just need to pay attention to the byte order, for example, if it is "0x00004F99" from the input, the output will be "99 4F 00 00". BUT the confusing part is here:

if (*lp++ == '0' && *lp++ == 'x'...)
....
my_asc2hex(*lp++, *lp++);

In "if" condition, the evaluating is one by one, the first item "evaluate" first, then is the next, while in function, the "evaluation" of parameters is, the last item first (put on the stack first), and moves on previous items. so that is why the first parameter to my_asc2hex is the latter one. kind of confusing using pointer!