Hi Philipp,
On what SFRPAGE are P3MDOUT and XBR2 located? Is that also the default?
Further, if you don't use our c8051f120.h> you will have to define _XPAGE
yourself to let the xdata initialization succeed in the future.
Maarten
> To look into SDCC mcs51 performance, I wanted to run Whetstone,
> Dhrystone, Coremark on an C8051. The C8051F120 is one of the few that
> has enough RAM.
> For getting started with the C8051F120 I tried to switch on / off an LED
> on a C8051F120 board with this program (and the same with P3 = 0x00;).
>
> #include <stdbool.h>
>
> __sfr __at(0xb0) P3;
> __sfr __at(0xa7) P3MDOUT;
> __sfr __at(0xe3) XBR2;
> __sfr __at(0xff) WDTCN;
>
> unsigned char _sdcc_external_startup(void)
> {
> // Disable watchdog timer
> WDTCN = 0xde;
> WDTCN = 0xad;
>
> return 0; // perform normal initialization
> }
>
> void main(void)
> {
> // Enable port output
> XBR2 = 0x40;
> P3MDOUT = 0x08;
>
> P3 = 0xff;
>
> for(;;);
> }
>
> But I always get a dimly lit LED; it is never fully on or off. When I
> first plugged in the board, it had the LED blinking (with whatever demo
> was on the board then), so the hardware seems to be ok.
>
> The board is the same as this one:
> http://www.colecovision.eu/mcs51/C8051F%20V2.1%20LED.shtml
> except that is has an C8051F120 instead of the C8051F020.
>
> The same cables and U-EC6 debug adapter clone work fine with the
> C8051F020 board.
>
> Philipp
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