[SOLVED] ARM 7 startup program

[manvindar]

i am new to ARM processors and want to write a simple code like monitoring pin P0.8 and if its high then LED should glow at Pin P0.22

how about to do that?

 

[alexan_e]

You have to be more specific to get help , which mcu are you using , and which IDE/compiler

 

[manvindar]

oh yea sry.....i am using LPC2129...and uvision 4

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here is rough code

#include <LPC21xx.h>
#define led (1<<22)
#define sw (1<<8)
int main (void)
{ PINSEL0=sw;
IODIR0=0xFFFFFFF; if (sw == 1)

IOSET0 = (1<<22); 
else 
IOCLR0 = (1<<22);
}

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whats wrong with this code???

#include <LPC21xx.h>
#define led (1<<22) // Led is bit 22
#define sw (1<<8)  // Switch is bit 8

int main (void)
{
  IODIR0 &= ~sw; // Set as inputs
  IODIR0 |= led; // Set as outputs

  while(1)
  {
    if (IOPIN0 & sw) // Check switch state, reflect to led
      IOSET0 = led;
    else
      IOCLR0 = led;
  }
}

[

 

[alexan_e]

whats wrong with this code???

#include <LPC21xx.h>
#define led (1<<22) // Led is bit 22
#define sw (1<<8)  // Switch is bit 8

int main (void)
{
  IODIR0 &= ~sw; // Set as inputs
  IODIR0 |= led; // Set as outputs

  while(1)
  {
    if (IOPIN0 & sw) // Check switch state, reflect to led
      IOSET0 = led;
    else
      IOCLR0 = led;
  }
}

[

I don't see a problem, what is the result of the code when you run it?

 

[manvindar]

the led is on every time....when i press the switch only the brightness increases

 

[alexan_e]

Can you post a schematic?
How is the led connected (Anode/Cathode) and to what voltage?
Did you use a resistor?

 

[manvindar]

sry the code is correct..actually the led is embedded in dev board and its connected to the other way......

 

[bigdogguru]

..actually the led is embedded in dev board and its connected to the other way......

Can you post the schematic or user manual of the development board you are using?


BigDog

 

[alexan_e]

sry the code is correct..actually the led is embedded in dev board and its connected to the other way......

And I'm not sure what you meant by that, does it mean that you reversed the logic states in the code and you solved your problem?

 

[manvindar]

yes yes right i reversed the logic thank you very much @alexan_e

problem solved