LAUNCHXL2-RM57L: Reading parallel data from a binary counter

Hi!

I am connecting 8-bit parallel data to the GPIO pins. How to read each of them and write to particular bit positions of a variable?

Thanks,
Apurv

Hello!

I have written this code for SN74LV8154 binary counter IC but it is not counting continuously, it resets at 7 or sometimes at a lower value only.

// include files
#include "HL_sys_common.h"
#include "HL_gio.h"
#include "HL_sci.h"
#include "HL_het.h"
#include <stdio.h>

#define GAL 2
#define GAU 18
#define GBL 16
#define GBU 30
#define RCLK 14
#define CCLR 12
#define CLK 22

char count[20];

void main()
{
unsigned long freq = 0;
uint8 b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26,b27,b28,b29,b30,b31;

// Initialize GIO driver
gioInit();

// Initialize SCI driver
sciInit();

// Initialize HET driver
hetInit();

// setting HET1 driver pins as output
gioSetDirection(hetPORT1, 0xFFFFFFFF);

//setting GIOA and GIOB driver pins as input
gioSetDirection(gioPORTA, 0x00000000);
gioSetDirection(gioPORTB, 0x00000000);

// initialization of the register
gioSetBit(hetPORT1, GAL, 1);
gioSetBit(hetPORT1, CCLR, 0);
gioSetBit(hetPORT1, GAU, 1);
gioSetBit(hetPORT1, GBL, 1);
gioSetBit(hetPORT1, GBU, 1);
gioSetBit(hetPORT1, RCLK, 0);
gioSetBit(hetPORT1, CCLR, 1);
gioSetBit(hetPORT1, CLK, 0);

while (1)
{
freq = 0;

// set CLOCK pulse
gioSetBit(hetPORT1, CLK, 1);
gioSetBit(hetPORT1, CLK, 0);

// set RCLK pulse
gioSetBit(hetPORT1, RCLK, 1);
gioSetBit(hetPORT1, RCLK, 0);

// read GBU byte
gioSetBit(hetPORT1, GBU, 0);

// read bits
b31 = gioGetBit(gioPORTB, 3);
freq = freq|b31;
freq<<=1;
b30 = gioGetBit(gioPORTB, 2);
freq = freq|b30;
freq<<=1;
b29 = gioGetBit(gioPORTA, 7);
freq = freq|b29;
freq<<=1;
b28 = gioGetBit(gioPORTA, 6);
freq = freq|b28;
freq<<=1;
b27 = gioGetBit(gioPORTA, 5);
freq = freq|b27;
freq<<=1;
b26 = gioGetBit(gioPORTA, 2);
freq = freq|b26;
freq<<=1;
b25 = gioGetBit(gioPORTA, 1);
freq = freq|b25;
freq<<=1;
b24 = gioGetBit(gioPORTA, 0);
freq = freq|b24;
freq<<=1;

// set GBU to HIGH again
gioSetBit(hetPORT1, GBU, 1);

// read GBL byte
gioSetBit(hetPORT1, GBL, 0);

// read bits
b23 = gioGetBit(gioPORTB, 3);
freq = freq|b23;
freq<<=1;
b22 = gioGetBit(gioPORTB, 2);
freq = freq|b22;
freq<<=1;
b21 = gioGetBit(gioPORTA, 7);
freq = freq|b21;
freq<<=1;
b20 = gioGetBit(gioPORTA, 6);
freq = freq|b20;
freq<<=1;
b19 = gioGetBit(gioPORTA, 5);
freq = freq|b19;
freq<<=1;
b18 = gioGetBit(gioPORTA, 2);
freq = freq|b18;
freq<<=1;
b17 = gioGetBit(gioPORTA, 1);
freq = freq|b17;
freq<<=1;
b16 = gioGetBit(gioPORTA, 0);
freq = freq|b16;
freq<<=1;

// set GBL to HIGH again
gioSetBit(hetPORT1, GBL, 1);

// read GAU byte
gioSetBit(hetPORT1, GAU, 0);

// read bits
b15 = gioGetBit(gioPORTB, 3);
freq = freq|b15;
freq<<=1;
b14 = gioGetBit(gioPORTB, 2);
freq = freq|b14;
freq<<=1;
b13 = gioGetBit(gioPORTA, 7);
freq = freq|b13;
freq<<=1;
b12 = gioGetBit(gioPORTA, 6);
freq = freq|b12;
freq<<=1;
b11 = gioGetBit(gioPORTA, 5);
freq = freq|b11;
freq<<=1;
b10 = gioGetBit(gioPORTA, 2);
freq = freq|b10;
freq<<=1;
b9 = gioGetBit(gioPORTA, 1);
freq = freq|b9;
freq<<=1;
b8 = gioGetBit(gioPORTA, 0);
freq = freq|b8;
freq<<=1;

// set GAU to HIGH again
gioSetBit(hetPORT1, GAU, 1);

// read GAL byte
gioSetBit(hetPORT1, GAL, 0);

// read bits
b7 = gioGetBit(gioPORTB, 3);
freq = freq|b7;
freq<<=1;
b6 = gioGetBit(gioPORTB, 2);
freq = freq|b6;
freq<<=1;
b5 = gioGetBit(gioPORTA, 7);
freq = freq|b5;
freq<<=1;
b4 = gioGetBit(gioPORTA, 6);
freq = freq|b4;
freq<<=1;
b3 = gioGetBit(gioPORTA, 5);
freq = freq|b3;
freq<<=1;
b2 = gioGetBit(gioPORTA, 2);
freq = freq|b2;
freq<<=1;
b1 = gioGetBit(gioPORTA, 1);
freq = freq|b1;
freq<<=1;
b0 = gioGetBit(gioPORTA, 0);
freq = freq|b0;

// set GAL to HIGH again
gioSetBit(hetPORT1, GAL, 1);

printf("%d\r\n", freq);
}
}

Where am I going wrong?

Regards,
Apurv

Hello Apurv,

The bxx (b0...b24) is either 0 or 1. what does "\"  in freq=freq\bx do?

Hello,

That is actually 'freq = freq|bx' for bitwise OR operation.

Regards,

Apurv