Astrobe Forum

Yes. This is also specified in section 7.7 "VIC Usage Notes" in UM10139: Also, before the next interrupt can be serviced, it is necessary that write is performed into the VICVectAddr register before the return from interrupt is executed. This write will clear the respective interrupt flag in the int...

Arrays and records in ARM Oberon-07 are allocated memory in multiples of four bytes. You can use SYSTEM.SIZE to find out how much storage each data type occupies. e.g. SYSTEM.SIZE(ZAP) returns 20 (12 + 4 + 4). If you are reading data from a binary file created on another system you will need to trea...

Hi, please could you show me a code example for testing the state of a single input pin? For examples see the discussion reading status inport in the Development Boards section of this forum: http://www.astrobe.com/forum/viewtopic.php?f=7&t=60 While I'm at it, it would be very helpfull to have exam...

Yes - of course. Sorry about the blooper! With the benefit of hindsight, it might be clearer to write it as two separate statements: R := LSL(value, 16); R := LSR(R, 22); If this form is used in a leaf procedure you do not need to worry about efficiency as it generates code which is identical to the...

If you want to typecast an INTEGER variable to a SET variable use the general typecasting function SYSTEM.VAL. e.g. VAR s: SET; i: INTEGER; s := SYSTEM.VAL(SET, i); Examples: i = 0, s = {} i = 8, s = {3} i = 0FH, s = {0..3} i = 0AAH, s = {1, 3, 5, 7} i = 055H, s = {0, 2, 4, 6} Note that this doesn't...

The LPC2103 has 32kB of flash *ROM* (program code) but only 8kB of RAM (program data). The Memory Available 7140 shown in the Info example refers to what is left of the 8kb of RAM. Have a look at Section 6.5 "Memory Map" in Astrobe > Help > Oberon for LPC Microcontrollers to see how the memory is al...

Hi Frans-Pieter, Thank you for your positive feedback and suggestion. I'm pleased to hear you are making good progress. For now I've just created one new forum for any topics that are related to specific development boards. If large numbers of topics for a particular manufacturer start to appear I c...

Thank you for your compliments :) Although Oberon-07 was designed by Niklaus Wirth, the designer of Pascal there are a few fundamental differences. Hence, not only are reserved words capitals only, but also all other identifiers are case-sensitive. Wirth introduced this change when he designed the l...

The built-in ORD function will typecast a CHAR to INTEGER i.e. VAR ch: CHAR; i: INTEGER; ... ... i := ORD(ch); This gives you the corresponding numeric ASCII value for that character. Knowing this, if you want to convert a single character (e.g. '9') to the integer value (e.g. 9) you can then say: I...