ColdFire/68K Microcontrollers and ProcessorsのトピックRe: M52233 functions

M52233 functions

anthonyrios — Wed, 27 Feb 2013 23:42:10 GMT

I am working with the M52233 Demo board and was wondering if there is a simple nono_sleep() function or some sort of delay function already implemented to be used with the Freescale CodeWarrior IDE and this board. Or should i make my own?

Re: M52233 functions

scifi — Thu, 28 Feb 2013 08:54:39 GMT

DMA timers are perfect for sub-microsecond delays. They can be configured as 32-bit naturally overflowing timers running at CPU frequency:

#include "mcf522regs.h"

#define DTIM_NUM 1

void
timer_init(void)
{
        DTIM_DTMR(DTIM_NUM) = DTMR_CLK_DIV1 | DTMR_RST;
}

void
timer_delay(unsigned int ticks)
{
        unsigned int start, diff;
        start = DTIM_DTCN(DTIM_NUM);
        do
        {
                diff = DTIM_DTCN(DTIM_NUM) - start;
        }
        while (diff <= ticks);
}

Re: M52233 functions

Monica — Mon, 04 Mar 2013 18:18:58 GMT

Anthony, was this of any help?

Please keep us posted!

Best regards!