Trying to make LED to blink rapidly on Microblaze(C languag)

[vccy118]

I need help on writing a simple C code to make the 8bit LEDs on Spartan 3E Starter Kit board to do several things:

1. LED 2 light up for indefinite duration when SWITCH 1 is being toggled
2. Wait for 3 seconds
3. LED 1 will light up and start blinking at 0.5 sec interval for indefinite duration
4. LED 1 and 2 will stop blinking when SWITCH 1 is being toggled back to initial state

5. LED 2 and 4 light up for indefinite duration and LED 1 will start blinking at 0.5 sec interval for indefinite duration when SWITCH 1 and 2 is being toggled
6. Wait for 3 seconds
7. LED 3 will light up and start blinking at 0.5 sec interval for indefinite duration
8. LED 1, 2, 3 and 4 will stop blinking when SWITCH 1 is being toggled back to initial state

And this is the C code I wrote so far:

#include "xgpio.h"
#include "xparameters.h"

#define LED_1 0x01
#define LED_2 0x02
#define LED_3 0x04
#define LED_4 0x08
#define LED_5 0x10
#define LED_6 0x20
#define LED_7 0x40
#define LED_8 0x80

int main(void)
{

  XGpio LED;
  XGpio SWITCH;

  int switch_initial, switch_state = 0;
  int switch_update = 0;
  int SWITCH_1 = 0x1;
  int SWITCH_2 = 0x2;
  int SWITCH_1_2 = 0x3;
  int TIME_DELAY = 1000000;
  int TIME_WAIT = 1000000;
  int TIME_INTERVAL = 1000000;
  volatile int count=1;  		
  volatile int wait=0;

  XGpio_Initialize(&LED, XPAR_LEDS_8BIT_DEVICE_ID);
  XGpio_Initialize(&SWITCH, XPAR_DIP_SWITCHES_4BIT_DEVICE_ID);
  
  XGpio_SetDataDirection (&LED, 1, 0x0);
  XGpio_SetDataDirection (&SWITCH, 1, 0xffffffff);
  
  switch_initial = XGpio_DiscreteRead (&SWITCH,1);
  
  while (1)
  {
  	switch_state = XGpio_DiscreteRead (&SWITCH,1);
  	
  	if (switch_state == SWITCH_1 && switch_update == 0)
  	{ 
 		XGpio_DiscreteWrite (&LED, 1, LED_2);
  		XGpio_DiscreteClear (&LED, 1, LED_1 | LED_8 | LED_3 | LED_4 | LED_5 | LED_6 | LED_7);
  		switch_update = 0;
 		
  		for (count; count>0; count++)
  		{  			
  			switch_state = XGpio_DiscreteRead (&SWITCH,1);
  			
  			if (switch_state != SWITCH_1)
  			{
  				break;
  			}
  			for (wait; wait<TIME_DELAY; wait++);
  			XGpio_DiscreteWrite (&LED, 1, LED_1);
  			for (wait; wait<TIME_DELAY; wait++);
  			XGpio_DiscreteClear (&LED, 1, LED_1);

  		}
  	}

  	if (switch_state == SWITCH_2 && switch_update == 0)
  	{
 		for (wait; wait<TIME_DELAY; wait++); 
  		XGpio_DiscreteWrite (&LED, 1, LED_4);
  		XGpio_DiscreteClear (&LED, 1, LED_1 | LED_2 | LED_3 | LED_8 | LED_5 | LED_6 | LED_7);
  		switch_update = 0;
  	}
  	
  	if (switch_state == SWITCH_1_2 && switch_update == 0)
  	{
 		for (wait; wait<TIME_DELAY; wait++); 
  		XGpio_DiscreteWrite (&LED, 1, LED_2| LED_4);
  		XGpio_DiscreteClear (&LED, 1, LED_1 | LED_3 | LED_8 | LED_5 | LED_6 | LED_7);
  		switch_update = 0;
  	}  	
  	
  	if (switch_state == switch_initial && switch_update == 0)
  	{
  		XGpio_DiscreteClear (&LED, 1, LED_1 | LED_2 | LED_3 | LED_4 | LED_5 | LED_6 | LED_7 | LED_8);
  		switch_update = 0;
  	}  	
  }


}

... and it doesn't work

When SWITCH 1 is toggled, LED 2 wont light up, but LED 1 will light up and won't blink.
SWITCH 2 is without the delay and blinking codes, so when I toggle SWITCH 2, LED 4 will light up indefinitely, as expected.

Some of the variables were defined ahead of time and not currently used, so please ignore it.

I really hope that I could get some insightful help here! Really out of ideas to implement this...

Thanks!

 

[benradu]

Re: Trying to make LED to blink rapidly on Microblaze(C lang

I didn't look through you code but I'll try to suggest you how to learn to do it.
When you use the wizard to generate the platform you also get a test a application which tests your peripherals. One of them is the LEDs GPIO. Have a look at the generated code and this will help you a lot. You can also study the GPIO API (right click on peripheral and look for View Driver Sourcecode (if I correctly remember). Then you can use the debugger to step though you code an see what happens. Hopefully this will help you learn how to work with Microblaze.