I'm trying to use sdcc with the Nordic Semi 8051-based parts, but I'm
not having much luck. The Nordic rep dropped a pile of dev boards on me
and said to use Keil, but that's just too expensive. Anyone have any
experience with these parts?
I started by writing a very simple test program to light the LEDs
attached to P0...
---
#include <8051.h>
__sfr at (0x93) P0DIR;
void main()
{
P0DIR = 0x0; // All pins are outputs
while(1)
P0 = 0xFF;
}
---
...and built it with both sdcc 2.8.0 and with the eval version of keil.
Keil produces a very short hex file that does the right thing. sdcc
produces a much longer file that doesn't work. After programming the
sdcc version the LEDs flash twice and then go dark.
Here's how I built it with sdcc...
sdcc --no-xinit-opt --opt-code-speed main.c
packihx main.ihx > main.hex
the resulting main.hex...
:03000000020008F3
:03001B00020003DD
:0500030012001E80FE4A
:08001E007593007580FF80FB63
:06001500E478FFF6D8FDBF
:0D000800758107120026E5826003020003E7
:0400260075820022BD
:00000001FF
and the keil output for comparison...
:08080C00E4F5947580FF80FB08
:03000000020800F3
:0C080000787FE4F6D8FD75810702080C33
:00000001FF
sdcc is generating an awful lot of instructions just to set some pins.
Keil is putting the bulk of the code at 0x800 with a jmp at 0x0, but I
don't see any reason it has to be that way. Nor do I see a way to get
sdcc to do the same thing.
Did I do something wrong? Am I missing some magic command line options?
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