Astrobe Forum

The ARM Cortex-M Oberon Programmers Guide states in section 4.1 ARRAY of BYTE: If the formal parameter is an array of bytes with a fixed size it can accept actual parameters of any type, except POINTER, whose size is the same number of bytes [...] Example 1: TYPE Word = ARRAY 4 OF BYTE; PROCEDURE p0...

Latest changes and extensions: https://oberon-rtk.org/description/changes-2024-01-29/ Main extension: reading from serial terminals: https://oberon-rtk.org/description/text-output-and-input/ New example program: https://oberon-rtk.org/examples/readterminal/ Some thoughts about the implications of us...

Made a few library changes, mostly to the text output machinery: https://oberon-rtk.org/description/changes-2024-01-17/ Added a new example program, showing how to avoid busy waiting for a peripheral: https://oberon-rtk.org/examples/nobusywaiting/ Edited the kernel description for structure and hope...

Today, I have made available a first set of Oberon modules to program the RP2040 using Astrobe for Cortex-M0, v9.0.3. There's also a tool to transmogrify Astrobe '.bin' file to the contents and UF2 format for the RP2040. The library contains as of today: 1) Basics to get off the ground: clocks, rese...

This test code MODULE TestEMITH; IMPORT SYSTEM; CONST SEV = 0BF40H; BEGIN SYSTEM.EMITH(SEV) END TestEMITH. results in a compiler exception (Astrobe for M0, v9.0.3): System.IndexOutOfRangeException: Index was outside the bounds of the array. at Decode.Decode.Op16IfThen(Int32 instr) at Decode.Decode.D...

Consider this code snippet REPEAT UNTIL SYSTEM.BIT(MCU.XOSC_STATUS, 31) and the corresponding assembly code: . 158 09EH 04808H ldr r0,[pc,#32] -> 192 . 160 0A0H 06801H ldr r1,[r0] . 162 0A2H 0D5FCH bpl.n -8 -> 158 . 192 <Const: 040024004H 040024004H> The procedure hangs at that point, unsurprisingly...

Interesting. Yes, this works, again a) checking the code and b) running a test program. Surprising though. The Astrobe docs about module system say: ADR returns the absolute address of the given variable. Now, that SYSTEM.ADR of a VAR procedure parameter would return the actual address of the argume...

To avoid busy-waiting at a serial output peripheral (USART), I am implementing buffered text output to a terminal. The intention is to use the DMA peripheral on the M0. Among other configuration, the DMA channel expects 1) a memory address of the buffer, and 2) the number of data items to transfer f...

I have been working on catching run-time errors in module bodies during the start-up of programs. To test, I have injected artificial errors, such as 'ASSERT(FALSE)', and the first obvious place was Main.Init, right at the end, after module Traps and the Terminal output have been initialised. Which ...

I suggest to replace the above quoted code with Or remove it and amend 'Storage.StackAvailable()' accordingly, also removing VAR 'stackLimit' from the module.