Search found 109 matches
- Sat Apr 10, 2021 2:26 am
- Forum: Astrobe for FPGA RISC5
- Topic: Why are the SPI MISO and SCLK signals shorted together?
- Replies: 2
- Views: 13422
Re: Why are the SPI MISO and SCLK signals shorted together?
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...
- Mon Jan 20, 2020 6:46 am
- Forum: Astrobe for ARM Cortex-M0, M3, M4 and M7
- Topic: Configuring Buffer Sizes
- Replies: 2
- Views: 20981
Re: Configuring Buffer Sizes
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...
- Sat Jan 18, 2020 1:48 pm
- Forum: Astrobe for ARM Cortex-M0, M3, M4 and M7
- Topic: Configuring Buffer Sizes
- Replies: 2
- Views: 20981
Configuring Buffer Sizes
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...
- Sat Dec 28, 2019 4:54 am
- Forum: Astrobe for ARM Cortex-M0, M3, M4 and M7
- Topic: push {}
- Replies: 20
- Views: 85154
Re: push {}
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 ...
- Fri Dec 27, 2019 12:11 pm
- Forum: Astrobe for ARM Cortex-M0, M3, M4 and M7
- Topic: push {}
- Replies: 20
- Views: 85154
Re: push {}
Thanks! Which reminds me of a question I had meant to ask for some time: Traps.mod has handlers for faults such as mem fault or bus fault, but I cannot find the location where the corresponding system handlers get enabled (register SCB_SHCSR, defaults to handlers disabled). Is this by design, or do ...
- Fri Dec 27, 2019 10:38 am
- Forum: Astrobe for ARM Cortex-M0, M3, M4 and M7
- Topic: push {}
- Replies: 20
- Views: 85154
Re: push {}
In the code snippet, is id.addr still set to the same value as with the current Astrobe version, ie. the return address as pushed by the processor upon exception entry? And does the compiler/linker still write the source code line number as four byte value at the address right after the svc instruct...
- Thu Dec 26, 2019 11:49 am
- Forum: Astrobe for ARM Cortex-M0, M3, M4 and M7
- Topic: push {}
- Replies: 20
- Views: 85154
Re: push {}
The stack trace code I had described here does not work with leaf procedures. The procedure calling the leaf procedure is not detected as the leaf procedure does not create its own stack frame. I have yet been unable to come up with a solution as I fail to find a reliable method to detect a leaf pro...
- Sun Oct 27, 2019 1:02 am
- Forum: Astrobe for ARM Cortex-M0, M3, M4 and M7
- Topic: push {}
- Replies: 20
- Views: 85154
Re: push {}
In the screenshot, the disassembler does not show the Oberon source lines, while the current module-based disassembler does. Is this a functional limitation of the new disassembler, or a display option?
- Tue Oct 15, 2019 7:00 am
- Forum: Astrobe for ARM Cortex-M0, M3, M4 and M7
- Topic: push {}
- Replies: 20
- Views: 85154
Re: push {}
Oh, the disassembler looks nice and very, very useful. Do you have an ETA for the new Astrobe version? Question regarding the stack trace: so there's no way of getting the procedure names? Address and line number is useful, so I am not complaining, but also having the procedure name right in the out...
- Wed Jun 19, 2019 12:36 pm
- Forum: Astrobe for ARM Cortex-M0, M3, M4 and M7
- Topic: SYSTEM Extensions
- Replies: 1
- Views: 18713
SYSTEM Extensions
Astrobe's SYSTEM offers easy access to the PC, LNK, SP, and FP registers, both readable and writable, which is very -- very! -- useful to muck around with separate stacks for each process, exception handling (errors, faults), and other low level code of that nature. To separate the process stacks (t...