[SOLVED] LEDs doesnt blink pic18f67k22

[Raady Here]

PIC18f67k22, MPLAB 8.8V

Hi,

I created a union of 48 bits, connected 48 LEDs to the 48 port pins and I am trying to send data to the port pins through function"TOPORT(BYTE cmd)" and trying to shift bits,

but I can observe blinking only from 0 to 31 led, from 32 to 47 doesn't work.

if i change 'cmd' from 'long int' to 'double' then bit shifting also doesn't work and 32 to 47 led doesn't work.

is there any limit for the buffer for these processors as it is 8 bit processor ?

typedef unsigned long int BYTE;
	
typedef union _display
{
	BYTE PORT;
	struct 
	{
		unsigned Z01:1;
		unsigned Z02:1;
		unsigned Z03:1;
		.....			
		unsigned Z47:1;
		unsigned Z48:1;
	};
} display_flags;	

void TOPORT(BYTE DT)
{
	LED_P.PORT 	= DT;
	LED01 		= LED_P.Z01;
	LED02		= LED_P.Z02;
	LED03		= LED_P.Z03;
        .......
        LED46		= LED_P.Z46;
	LED47		= LED_P.Z47;
	LED48		= LED_P.Z48;
	Delay100TCYx(100);
}

void main()
{
      unsigned int ih = 0;
	....
	while(1)
	{
		
		cmd = 0b000000000000000000000000000000000000000000000001;
		for(ih = 0;ih<48; ih++)
		{
			TOPORT(~cmd);
			cmd = cmd << 1;
		}
	}	
}

 

[horace1]

the bitwise shift operators only work with integer data types
as the PIC18 does nat have the long long int data type I think you need to have seperate code to deal with LEDs 0 to 31 and LEDs 32 to 47

for(ih = 0;ih<48; ih++)
	{
	if (ih < 32)
              {
              TOPORT(~cmd);
	      cmd = cmd << 1;
	      }
       else
              {
                 ...
              }

 

[Raady Here]

even if i don't apply the shifting it doesn't work

while(1)
{
        cmd = 0x000000000000;
        TOPORT(cmd);
        delay();
        cmd = 0xFFFFFFFFFFFF;
        TOPORT(cmd);
        delay();
}

only 0 to 31 LEDs are blinking.

 

[Raady Here]

Xc8 compiler assumes the highest int bits as 32 , mentioned in section 5.4 of the manual.

 

[horace1]

Xc8 compiler assumes the highest int bits as 32 , mentioned in section 5.4 of the manual.

yes, although the gnu compilers define the long long int type the XC8 implementation is only 32bits

have you got it working OK now?

 

[Raady Here]

I am sending data splitting data in to 2 separate structures of 24 bits each.