Re: [Mspgcc-users] MSPDebug version 0.9

[JMGross]

In theory, this should toggle the LED with about 3Hz (1MHz MCLK assumed).
BUT
Empty while/for loops are no reliable waiting loops.
Depending on the optimization, the compiler might as well remove the whole 
loop, ending in your LED being toggled with ~100kHz.
You should at least add a _NOP() in the loop. This will force the compiler to 
at least generate a construct that will execute the NOP for 50k times, 
resulting in ~20Hz blink frequency,

JMGross


----- Ursprüngliche Nachricht -----
Von: Andres Vahter
An: GCC for MSP430 - http://mspgcc.sf.net
Gesendet am: 23 Jul 2010 12:16:29
Betreff: Re: [Mspgcc-users] MSPDebug version 0.9

Hi,

Is it possible to program msp430f2234 MCU with EZ430-RF2500 board and mspdebug.
EZ430-RF2500 board comes with msp430f2274 MCU and it differs from f2234 only 
from RAM size as far as I know.

I made a led togglerer for f2234, i can upload it, but it doesn't toggle pin.

#include    "msp430x22x4.h"
volatile unsigned int i;

int main(void) {
    WDTCTL = WDTPW + WDTHOLD;
  
    P2DIR |= 0x01;
    
    for(;;)
    {
        P2OUT ^= 0x01;
        i = 50000;
        while (i != 0) { i--; }
    }  
}
for( ; ; )


Daniel, could you confirm that msp430f2234 is supported by mspdebug.

Andres