Articles, notes and random thoughts on Software Development and Technology
A few notes on useful syscalls:
SWI 0 : executes instruction based on value in R7
Write to screen: R7 = 4
MOV R7, #4 @ Syscall 4 = write to screen MOV R0, #1 @ stdout: move 1 to R0 MOV R2, #4 @ length of string to R2 LDR R1, =string SWI 0 string: .ascii "testn"
Read from keyboard: R7 = 3
MOV R7, #3 @ Syscall 3 = read from keyboard MOV R0, #0 @ stdin?: move 0 to R0 MOV R2, #4 @ length of string to ready to R2 LDR R1, =string @ load R1 value to string location SWI 0 string: .ascii ""
JAXB appears to fail silently in some cases if the XML it’s attempting to unmarshall to mapped classes doesn’t have the necessary mapped properties.
You can get additional output by adding the following:
-Djaxb.debug=true
– displays information during JAXB initialization
Before you call unmarshall() on your Unmarshaller, call setEventHandler() and add a DefaultValidationEventHandler as follows:
Unmarshaller um = jaxbContext.createUnmarshaller(); um.setEventHandler(new javax.xml.bind.helpers.DefaultValidationEventHandler());
– this will output additional failure information about missing mappings for xml elements, useful if your mapped class ends up with missing values.
I haven’t done any Android development for a couple of years. I just updated to the latest ADT, version 22.6, and seems I’m run into an issue where I can’t create a new AVD. Exactly the same as this problem here. So now downloading an older version of ADT and I’ll try again.
Most things are easy to work out in FLDIGI, but I just tried working a station that was working RTTY split, listening 1 up. You can certainly do this via settings on your radio but FLDIGI allows you to set different rx and tx freqs too – which is easier as it’s just point and click:
Don’t forget to unclick Lck when you’re done.
I got this from the manual here (funnily enough).