Astrobe Forum

Thanks for your information and insights. Your general words of caution are useful in any case, as in case "self-freeing" would not work, the unloading could easily be delegated to an extended loader process/task that would free the first program before loading the subsequent one. My current design ...

Is there any reason why, or a situation when, this would not work? MODULE M; IMPORT Modules, Oberon; PROCEDURE Run*; BEGIN Modules.Free("M"); Oberon.Collect(0) END Run; END M. That is, a module unloading itself. The reasoning here is that Modules.Free just sets the module name to the empty string, a...

With the Astrobe compiler, SYSTEM.PUT(adr, val) transfers either eight or 32 bits, depending on the type of 'val'. But what if 'val' is an expression? I had this procedure interfacing a device in the FPGA hardware. PROCEDURE SetSignal*(dev: INTEGER; sig: BYTE); BEGIN SYSTEM.PUT(Adr, LSL(sig, DataShi...

As mentioned in here , my first real use of creating my own boot file was to make the stack size configurable. To tie up that loose end, here's how. It should basically apply to Project Oberon as well, but I'll focus on Embedded Oberon. The stack size is hard-coded to 32 kB (8000H) in two places. Ke...

The following applies to Embedded Oberon, running on an FPGA board, using an SD card for storage. To venture into making changes to the inner core of the Embedded Oberon (EO) system, that is, modifying modules Files, FileDir, Modules, or Kernel, it's necessary to create a new boot file to reflect th...

I also use Win32 Disk Imager and the 'dd' command line tool. Here's my backup approach. I use Disk Imager to initially create an SD card to boot Embedded Oberon, using the disk image as downloaded from the Astrobe website, eg. 'Embedded200812.img'. Thereafter, I have an SD card with a 256 MB FAT par...

I think we should differentiate between the SPI device itself, and SPI-connected devices, for lack of a better term. The SPI device is implemented in the FPGA, the SPI-connected devices are, well, connected to this SPI device. The SD card is an SPI-connected device, as is the RTC if installed. Using...

You are right, I had come to the same conclusion. To actually see what the type complexity entails, down to the interrupt handler and so on, I implemented the module, and it results in roughly doubling the code size: about 4k for the "complex" version, about 2k for a version along the lines you sugg...

I am struggling with an seemingly straightforward problem. I am re-implementing my channels for input and output. Channels are abstractions of actual devices, such as serials. For a buffered implementation I need, well, buffers. I would like to have different buffer sizes for the different serials i...

FWIW, I enable the handlers from my Exceptions.Init, which corresponds to your Traps.Init, both called from Main.mod, ie. right before the application code starts. At this point, I can simply write to SCB_SHCSR. CONST SCB_SHCSR = MCU.NVICBase + 0D24H; MEMFAULTENA = 16; BUSFAULTENA = 17; USGFAULTENA ...