![]() ![]() ![]() The RPi/s USB ports are too close together to accept a sound card USB adapter so you will need a hub or a USB extension. Ed Valasek (K3HTK), more on Ed later, is using the Sabrent AU-MMSA. I am using the SYBA SD-CM-UAUD USB Stereo Audio Adapter. There are a pile of cheap USB soundcards. The RPi only has audio output so a soundcard is needed. I tested this with a 16 GB card formatted as FAT32 with SD Formatter on a Win 7 machine and imaged it with Win32DiskImager. I recommend you install the full Raspbian image rather than NOOBS. You will need an 8 to 32 GB micro SD card with Raspbian loaded on it. The OS image is loaded from a micro SD card. Note: There are a number of DVI interface configurations (DVI-I, DVI-D etc.) make sure your cable is compatible with your monitor’s input. If you have a monitor with DVI input you can purchase an HDMI to DVI cable to go between the RPi and your monitor. If you have an HDMI ready monitor (or TV) just connect it with an HDMI cable to the RPi and you are all set. The RPi outputs composite video and HDMI. The Pi will run on less, try a cell phone charger…Ī good source for RPi hardware is. * RPi micro USB power supplyĪ 2.5 amp 5 vdc supply is recommended. Only a separate keyboard / mouse has been tested. A keyboard with a built in USB hub will save you one of the RPi’s USB ports (it has 4) but isn’t required. Let’s take these one at a time: * USB Keyboard and mouseĪlmost any USB keyboard and mouse will work. USB Hub: powered or unpowered, needs enough room for the USB Soundcard.Micro SD card with an operating system installed.The RPi is sold without an operating system or any type of input / output so you will need: Once done, it is a good idea to reverse the change in the swap file configuration and go back to CONF_SWAPSIZE=100.Here’s how I did did it: Getting the RPi Operational Now you should be able to build Fldigi successfully. nano or emacs):Ĭhange the ‘100’ to ‘1024’ and save the file:Īt this point, you can reboot to activate the new setting, or you can run these two commands to reconfigure the virtual memory configuration: I use vi to edit text files, but you can of course use any text editor you are familiar with (e.g. To do that, we need to edit the file /etc/dphys-swapfile. In this case however, we need to increase the amount of swap space available to help the compiler to compile this file. There are constant read and write operations going on, and swap space, when you run low on memory gets probably hit with the bulk of it. That is different when the card is used to run an operating system. In this mode, the number of write operations to the same location is not very large, even if you use your camera every day. ![]() Then you copy the files to your computer and then you may or may not delete these images. These cards were designed for cameras, where you take a picture and save it, then take another picture and save it – repeat 100 times. In general, when you run an operating system from a SD card, having any amount of swap space is probably a bad idea, because repeatedly writing over the same portion of memory on the SD card will wear it out eventually. A few seconds of searching on Google revealed the reason: Raspbian uses 100MB of swap space. The error message indicates that I did not have enough virtual memory. The term “virtual memory” pointed me in the right direction: In a very simplistic view, virtual memory is the sum of real memory and the size of the swap file/partion on a Unix system. Virtual memory exhausted: Cannot allocate memory Make: Entering directory '/home/pi/radio/fldigi-4.1.01/src' I never had a problem compiling versions 4.0.xx, but when I first tried to build the new version, I ended up with an error message: After getting Fldigi 4.1.01 to compile on macOS, I tried it on my Raspberry Pi running Raspbian Stretch. ![]()
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