a blog about computers and other funny things
Month: October 2019
This is nice for debugging purpose, when you are seeing printf %f printing wrong thing:
https://www.h-schmidt.net/FloatConverter/IEEE754.html
Just print the float value as hexadecimal using printf %x to confirm it is equal to value you saw in the above link.
I already demonstrated how to use NuttX with GSM modem. But I realized that it wasn’t with DNS support enabled. Then I decided to enable DNS and test it again:
ATE1 OK chat: OK AT+CGDCONT=1,"IP","tim.br"
AT+QACCM=0,0 OK chat: OK ATD99**1#
AT+CGDCONT=1,"IP","tim.br" OK chat: CONNECT ATD99**1# CONNECT IP: 192.168.254.254 IP: 100.86.71.207 IP: 100.86.71.207
nsh> mount -t procfs /proc
nsh> ifconfig
ppp0 Link encap:TUN at UP
inet addr:100.86.71.207 DRaddr:192.168.254.254 Mask:0.0.0.0
nsh> ? help usage: help [-v] []
[ cp exec hexdump mh set umount ? cmp exit ifconfig mount sh unset addroute date false kill mw sleep usleep break dd free ls nslookup test xd cat echo help mb ps true
Builtin Apps: ping testlogbuf leds pppd
nsh> nslookup google.com Host: google.com IPv4 Addr: 172.217.29.110
nsh> ping google.com PING 172.217.29.110 56 bytes of data 56 bytes from 172.217.29.110: icmp_seq=0 time=420 ms 56 bytes from 172.217.29.110: icmp_seq=1 time=490 ms 56 bytes from 172.217.29.110: icmp_seq=2 time=530 ms 56 bytes from 172.217.29.110: icmp_seq=3 time=840 ms 56 bytes from 172.217.29.110: icmp_seq=4 time=410 ms 56 bytes from 172.217.29.110: icmp_seq=5 time=500 ms 56 bytes from 172.217.29.110: icmp_seq=6 time=540 ms 56 bytes from 172.217.29.110: icmp_seq=7 time=590 ms 56 bytes from 172.217.29.110: icmp_seq=8 time=640 ms 56 bytes from 172.217.29.110: icmp_seq=9 time=680 ms 10 packets transmitted, 10 received, 0% packet loss, time 10100 ms nsh>
I just followed the video tutorial #044:
After the GSM modem connection I’m trying to “ping 8.8.8.8” and it is returning an error:
ATZ
OK
chat: cmd 1, arg ON
chat: cmd 4, arg 30
chat: ATE1
chat: OK AT+QACCM=0,0
ATE1
OK
chat: OK AT+CGDCONT=1,"IP","tim.br"
AT+QACCM=0,0
OK
chat: OK ATD99**1#
AT+CGDCONT=1,"IP","tim.br"
OK
chat: CONNECT
ATD99**1#
CONNECT
IP: 192.168.254.254
IP: 100.74.7.202
IP: 100.74.7.202
nsh> ifconfig
nsh: ifconfig: opendir failed: 20
nsh> mount -t procfs /proc
nsh> free
total used free largest
Umem: 24416 15016 9400 9400
nsh> ifconfig
ppp0 Link encap:TUN at UP
inet addr:100.74.7.202 DRaddr:192.168.254.254 Mask:0.0.0.0
nsh> ping 8.8.8.8
PING 8.8.8.8 56 bytes of data
No response from 8.8.8.8: icmp_seq=0 time=1000 ms
No response from 8.8.8.8: icmp_seq=1 time=1000 ms
No response from 8.8.8.8: icmp_seq=2 time=1000 ms
No response from 8.8.8.8: icmp_seq=3 time=1000 ms
No response from 8.8.8.8: icmp_seq=4 time=1000 ms
No response from 8.8.8.8: icmp_seq=5 time=1000 ms
No response from 8.8.8.8: icmp_seq=6 time=1000 ms
ERROR: sendto failed at seqno 7: 114
7 packets transmitted, 0 received, 100% packet loss, time 7070 ms
nsh>
I suspect the issue is in the Mobile Operator TIM
UPDATE: I was using a bad antenna. Using a better GSM antenna everything worked fine:
Blender is a very powerful 3D software, but it also has internally a good Video Editor (VSE – Video Sequence Editor).
If you want to learn it, there is a good video tutorial playlist here:
The Blender VSE has a very power effect feature called Transform, you just select the your video strip and Add -> Effect Strip -> Transform. Then you can offset, zoom in/out, rotate, etc.
But it is also possible to use Keyframe with Transform, but it is a little bit tricker because it doesn’t follow the traditional Blender way. You need to edit the Transform strip Properties (press N case it is not visible) and edit the values, for each edited value press ENTER to confirm and then type I to Insert keyframe.
If it worked you will see the Property field changing its color to yellow:
Alan C. Assis 