Astrobe Forum

I am baffled by the following behaviour (Cortex M3, STM32F207 target). Here's a minimal test case, condensed and abstracted from my actual code. MODULE testalloc; IMPORT Main, Out; TYPE P = POINTER TO Pdesc; Pdesc = RECORD i: INTEGER END; VAR p: P; BEGIN NEW(p); p.i := 13; Out.Int(p.i, 0); Out.Ln EN...

I need to reference procedures that are defined further down in the program text. It's not possible to re-arrange the code in a way that this can be avoided (use case: a state machine, where each state is represented by a procedure, and certain state changes will require forward refs). (Astrobe) Obe...

The IDE terminal only shows output, eg. via 'Out.Char()', only after 'Out.Ln'. In comparison, if I connect to the board using PuTTY, each output shows immediately. Is there a way to configure/change this behaviour in Astrobe?

Follow-up question: say, I have a module, let's call it LED.mod, in my project directory. The programme compiles and links fine. Now I move LED.mod to a library directory (which is on the list of dirs to search), but (erroneously) leave LED.sym and LED.arm in the project directory. When I simply com...

Is there a possibility to make the Astrobe editor "listen" to changes made to open files made with another editor, or a "reload" function without closing and reloading the file? The keyboard shortcuts cannot be changed, right? Can I prevent the terminal window from scrolling to the bottom whenever ...

And you don't mark the exception handlers in Traps.mod with square brackets because it does not matter, as you never return to the interrupted code anyway? Sorry for all the nagging, I would like to understand all this... In the same vein -- the nagging and trying to understand :| -- another questio...

ad 1.) true, that's a bad idea. It would result in a Hard fault. The ASSERT needs to be in SVCall: PROCEDURE SVCall*(h: PROCEDURE); VAR currentHandler: PROCEDURE; BEGIN ASSERT(h # NIL, 100); sysHandler := h; ... ad 2.) as sysHandler runs as exception handler, it will result in a Hard fault. But that...

When an interrupt handler is invoked any additional registers that need to be saved are automatically saved. Just to be sure: so all exception handlers, not only ISRs (eg. a handler for the SVC call/exception), need to be marked with the square-bracketed integer, like 'PROCEDURE handler[0]', so the...

Two questions: With an interrupt, only R0 to R3 [1] are pushed onto the stack upon entry of the ISR. Does the compiler automatically account for this limitation when compiling ISRs, or is there anything I need to take care of manually? Does all thread mode (ie. not handler) code run privileged? Is t...

Here's a version that works without changing Traps.mod, using the vector swapping technique (relevant excerpt from my Kernel.mod module, leaving out the SysTick business). CONST ... SVC_Instruction = 0DF00H; SVC_Vector = 02CH; VAR ... sysHandler: PROCEDURE; svcTrapAddr: INTEGER; PROCEDURE svcHandler...