_delay_cycles

Nakul Nagpal

Prodigy 10 points

Other Parts Discussed in Thread: MSP430G2231

This code blinks only red LED.

#include <msp430g2231.h>

void main()

{

P1DIR = 0x41;

P1OUT = 0;

while(1)

{

P1OUT = 0x01; // P1.6 on (green LED)

_delay_cycles(30000);

P1OUT = 0x00;

_delay_cycles(30000);

P1OUT = 0x40;

_delay_cycles(30000);

}

This code blinks both LED

#include <msp430g2231.h>

void main()

{

P1DIR = 0x41;

P1OUT = 0;

while(1)

{

P1OUT = 0x01; // P1.6 on (green LED)

_delay_cycles(10000);

P1OUT = 0x00;

_delay_cycles(10000);

P1OUT = 0x40;

_delay_cycles(10000);

}

over 14 years ago

0 Jens-Michael Gross over 14 years ago

Guru 227245 points

I always said that for loops or __delay_cycles() isn't the proper way of doing delays. :)

But besides the fact that

Nakul Nagpal said:
P1OUT = 0x01; // P1.6 on (green LED)

doesn't really fit (0x01 and P1.6?), I don't see why it should fail. A look at the generated assembly code could could perhaps reveal what's going wrong here.

0 Jonathan Velez over 11 years ago in reply to Jens-Michael Gross

Prodigy 235 points

Greetings,

I stumbled on this post, and read your post. I am curious to know what you would suggest is the proper way of doing delays?

Best regards,

Jonathan Velez

0 Ilmars over 11 years ago in reply to Jonathan Velez

Guru 46710 points

Jonathan Velez said:
proper way of doing delays?

If we talk about LED blinking delays then using timer interrupts with CPU sleep/wake-up is proper way. __delay_cycles() shall be used for short delays like I/O settle delays

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_delay_cycles