opkg Installing A Software Package In Angstrom

http://www.elinux.org/Installing_A_Software_Package_In_Angstrom

make sure boards are connected to internet:
ping www.google.com -w 2

  • Update the list of available packages:
opkg update

check whats are available related to ....
opkg list|grep <package name>

  • To install a package in Angstrom, type the following command
 opkg install <package name>

  • To see if a particular package is already installed in Angstrom, type the command below
opkg list-installed|grep <package name>









































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Heltec ESP32+OLED+Lora, hardware testing




















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   you can easily find some good boards from china, but most of them lack of accurate document...  Hrere is an example;   https://hackaday.io/project/26991-esp32-board-wifi-lora-32   the board looks good with lora and a 128x64 OLED, but the IIC and reset connection is important, since pin can be muxing easily, so every board could be different.   pinMode(16,OUTPUT);   digitalWrite(16, LOW); // set GPIO16 low to reset OLED   delay(50);   digitalWrite(16, HIGH); // while OLED is running, must set GPIO16 to high    and, if needed, edit your Wire.begin() to Wire.begin(4,15); (4 = SDA 15 SCL)    i tested it with the Adafruit SSD1306 and the Acrobotics SSD1306 Librarys   both work.    Display size is 128x64        There are discussions on these boards on TＴＮ as a LORA node..or maybee single ch gateway?   Heltec has a git :  https://github.com/Heltec-Aaron-Lee   And there is another copy call TTGO  https://de.aliexpress.com/item/TTGO-LORA32-868-915-Mhz-SX1276-ESP32-Oled-display-Bluetooth-WIFI








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micro SD card for ESP32, on lolin32 with OLED and heltec 32 lora oled




















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I have purchased 2 micro SD card holder for my esp project.     First I would like to test with heltec esp32 lora oled module.  this module uses:  sck=05  MISO=19  MOSI=27  SS(lora)=18, then I assigned 21 for sd SS   and there is a lib in esp32-arduino, which use SS default at 5   I took the example and use SD.begin(21), but I alway get the error:  entry 0x40078a9c  Card Mount Failed   But I do saw once that it read out the sd card type and volume.    Not sure it's the issue of lora sd card swithing, or it just can't work.   The other esp32 card I have is an wemos esp32 oled, it did not leave me too much pins, I need to find out how to connect sd to it.   But I have wemos D1 mini esp8266 on hand, and connect it as:    * The WeMos Micro SD Shield uses:    * D5, D6, D7, D8, 3V3 and G    *    * The shield uses SPI bus pins:    * D5 = CLK    * D6 = MISO    * D7 = MOSI    * D8 = CS     It's not working with the example in the arduino IDE 1.8.5, which marked SD(esp8266), but it w








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Install Network Time Protocol(NTP) on BeagleBone with Angstrom linux and set local time zone





















 Referenced from : http://cwraig.id.au/?p=513   1. Update your Package List   opkg update   2. Get the ntp Package   opkg install ntp ntpdate   Update 2014/07/03  for the latest beaglebone image(2013-06-20) with kernel 3.8.12, after this installation,   system will add to service list, so only need to change time zone   3. Now we need to stop the ntpd service so we can request a manual update   /etc/init.d/ntpd stop   manual update   ntpdate pool.ntp.org   type in date, you should see the date is changing to current date and time, but the time zone is not corrected.   The time zone info is contained in /etc/localtime , use this to remove it:  rm /etc/localtime   before link up our time zone, look into /usr/share/zoneinfo folder for your timezone.   I did not find taiwan in asia, not plan to use hong_kong, but there is still:  /usr/share/zoneinfo/Etc/GMT-8   now we make the link with ln command  ln -s /usr/share/zoneinfo/Etc/GMT-8 /etc/localtime   now type date again to check, should ha








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