Tiva C Launchpad 123gxl, connected with RTC, keypad and LCD display, time change in RTC through keypad

anupsingh chandel

Hello,

I have connected LCD display, 4 keys (mode, up, down, enter) and RTC through Tiva C launch pad 123GXL .. Everything works fine until I change the time through keypad.

My application ask for change in time via keypad (it will be displayed on LCD) and RTC should start from the changed time.

I am trying to change the Minute counter by up/down keys but once the RTC has fetched time from initial values it does not changes.

Below is my code:

//*****************************************************************************
// This program has LCD dispaly, RTC, keypad control code
//  
// 
//
//*****************************************************************************

#include <stdint.h>
#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_i2c.h"
#include "inc/hw_gpio.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/i2c.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"
#include "utils/ustdlib.h"
#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/interrupt.h"
#include "driverlib/gpio.h"
#include "driverlib/timer.h"
#include "inc/hw_memmap.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"
#include "inc/hw_gpio.h"
#include "inc/hw_sysctl.h"
#include "inc/tm4c123gh6pm.h"

// Defination of variables

#define databits GPIO_PORTB_DATA_R
#define SLAVE_ADDRESS 0x68

void ConfigureUART(void);
void initI2C();
unsigned char dec2bcd(unsigned char val);
unsigned char bcd2dec(unsigned char val);
unsigned char dec2aski(unsigned char val);

unsigned long sec=35 , min = 26 ,hour = 10, min1,min2,min3  ;
 unsigned long tsec, tmin, thour, DOW,DOW_askii;
unsigned long day=6 , date=7 , month=8  , year=15  ;
unsigned long tdate, tmonth, tyear,tday, ldate1, ldate2;
unsigned long lsec, lmin, lhour, ldate, lday, lmonth, lyear,n_askii;


#define databits GPIO_PORTB_DATA_R
unsigned long DOW, DOW_askii;



int n=0,n1=0,n2=0,t;
int k=0, d=0, e=0;
int m,count;
int m1,m2,m3,m0;
int Mode_Pin=0;
int UP_Pin=0;
int Down_Pin=0;
int Enter_Pin=0;
int b0=0;
int b1=0;
int b2=0;
int b3=0;
int c1=0;
int scan=0;

int count0;
int count1;
int count2;
int count3;
int count4;
int count5,a_count5_x, a_count5_y;
int count6;
int count7;
int count8;
int count9;

unsigned long a_count0, a_count1, a_count2, a_count3, a_count4, a_count5, a_count6, a_count7, a_count8, a_count9;

volatile unsigned long ulLoop;
unsigned char Last_Value = 1;
//
// The error routine that is called if the driver library encounters an error.
//

#ifdef DEBUG
void
__error__(char *pcFilename, uint32_t ui32Line)
{
}
#endif

//LCD code
//PB0 to PB1 Data Lines
//PA6 = RS
//PA7 = E
//R/W = GND
// PE0 = Mode
// PE1 = UP
// PE2 = Down
// PE3 = Enter

// LCD Code
//**************************************************************************************************
#define databits GPIO_PORTB_DATA_R
unsigned long DOW, DOW_askii;
void LCD_command(unsigned char data)
{

	    SysCtlDelay(SysCtlClockGet()/5000);
		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x00);
		SysCtlDelay(10);
		GPIOPinWrite(GPIO_PORTB_BASE,GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3,data); // DATA Pins for 4 bit mode
		SysCtlDelay(10);
		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x00);
		databits=data>>4;
		SysCtlDelay(10);
		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x80);
		SysCtlDelay(10);
		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x00);
		SysCtlDelay(10);
		databits=data;
		SysCtlDelay(10);
		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x80);
		SysCtlDelay(10);
		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x00);
		SysCtlDelay(10);

}

void LCD_command_8bit(unsigned char data)
{
	    SysCtlDelay(10);
		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x00);
		SysCtlDelay(15000);
		GPIOPinWrite(GPIO_PORTB_BASE,GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3,data); // DATA Pins for 4 bit mode
		SysCtlDelay(15000);
		databits=(data);
		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x80);
		SysCtlDelay(15000);
		SysCtlDelay(SysCtlClockGet()/5000); // 1 sec delay
		databits=(data);
		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x00);
		SysCtlDelay(15000);

}
void LCD_data(unsigned char data)
{
	    SysCtlDelay(SysCtlClockGet()/5000);

		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x00);

		GPIOPinWrite(GPIO_PORTB_BASE,GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3,data); // DATA Pins for 4 bit mode

		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6,GPIO_PIN_6);

		SysCtlDelay(10);

		databits=data>>4;

		SysCtlDelay(10);

		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_7,GPIO_PIN_7);

		SysCtlDelay(10);

		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_7,0x00);

		SysCtlDelay(10);

		databits=data;

		SysCtlDelay(10);

		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_7,GPIO_PIN_7);

		SysCtlDelay(10);

		GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_7,0x00);

		SysCtlDelay(10);


}

void clear (void)
{
	LCD_command(0x01);
	SysCtlDelay(30000);
}

void LCD_Init()
{
	    clear();

		SysCtlDelay(SysCtlClockGet()/15);

		LCD_command_8bit(0x30);

		SysCtlDelay(SysCtlClockGet()/30);

		LCD_command_8bit(0x30);

		SysCtlDelay(SysCtlClockGet()/30);

		LCD_command_8bit(0x30);

		SysCtlDelay(SysCtlClockGet()/30);

		LCD_command_8bit(0x20);

		SysCtlDelay(SysCtlClockGet()/30);

		LCD_command(0x28);

		SysCtlDelay(SysCtlClockGet()/30);

	    LCD_command(0x0C);

	    SysCtlDelay(SysCtlClockGet()/30);

	    clear();

}

void LCD_String_Display(unsigned char *str)
{

 while(*str)

 {
	 LCD_data(*str);
	 str++;
 }
return;

}

// Keypad code

void up()//loop to move up
{
	//Mode_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_0);
	UP_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_1); //anup
	if(UP_Pin==0)
	{
		n=n+1;
		//k=0;
	}
}


void down()//loop to move down
{
	Down_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_2);
	if(Down_Pin==0)
	{
		n=n-1;
		//d=d+1;

	  // k=0;
	}
}


void select()//loop to select the mode
{
	Mode_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_0);
	if(Mode_Pin==0)
	{
		k=k+1;
		n=0;
		d=0;
		e=0;
		count1=0;
		count2=0;
		count3=0;
		count4=0;
	//	count=0;
	}
}

void enter()//loop to select the mode
{
	Enter_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_3);
	if(Enter_Pin==0)
	{
		d=d+1;
		e=e+1;
	}
}

void rtcwrite()
{
	min = min3;
	t=0;
}

void mode()

{

	if (k==0)
	{
		switch(n)

			    {

			     case 0:
			    	 LCD_String_Display("M101: I/P Voltage");
			         LCD_command(0xC0);
			         LCD_String_Display("Vin : 90 V");
			    	 break;

			     case 1:
			    	  LCD_String_Display("M102:I/P Current");
			    	  LCD_command(0xC0);
			    	  LCD_String_Display("Iin : 200 A");
			    	  break;

			     case 2:
			    	   n=0;
			    	   LCD_String_Display("M101: I/P Voltage");
			    	   LCD_command(0xC0);
			    	   LCD_String_Display("Vin : 90 V");
			    	   break;

			     case -1:
			    	    n=1;
			    	    LCD_String_Display("M102:I/P Current");
			    		LCD_command(0xC0);
			    	    LCD_String_Display("Iin : 200 A");
			    	    break;

			     }

	}

	else if (k==1)
	  {

		       switch(n)

					  {
					     case 0:
					    	 LCD_String_Display("M201:Fault Status");
					         LCD_command(0xC0);
					    	 LCD_String_Display("F1: I/P OV Volt");
					    	 break;

					     case 1:
					    	LCD_String_Display("M202:Fault Status");
					        LCD_command(0xC0);
					        LCD_String_Display("F2: I/P UN Volt");
					       break;

					     case 2:
					    	 n=0;
					    	 LCD_String_Display("M201:Fault Status");
					    	 LCD_command(0xC0);
					    	 LCD_String_Display("F1: I/P OV Volt");
					    	 break;
					    case -1:
					    	 n=1;
					    	 LCD_String_Display("M202:Fault Status");
					    	 LCD_command(0xC0);
					         LCD_String_Display("F2: I/P UN Volt");
					    	 break;

					     }
        }

	else if (k==2)
	{
			    count=0;
			    switch (d)
			    			 {
			    case 0:
			    	 LCD_String_Display("M301: Enter Password");
			    			// LCD_command(0xC0);
                   break;
			    case 1:
			              LCD_String_Display("M301: Enter Password");
			              LCD_command(0xC0);
                          a_count1 = ((count1/0xA) | 0x30);
			              a_count1 = ((count1 % 0xA) | 0x30);
			              LCD_data(a_count1);

			             if(UP_Pin==0)
			              	   {
			              	      count1=count1+1;
			              	      n=0;
			              	    }
			                if(Down_Pin==0)
			                   {
			               	     count1=count1-1;
			               	     n=0;
			                   }
			               break;

			              case 2:
			            	 LCD_String_Display("M301: Enter Password");
			            	 LCD_command(0xC0);
			            	 a_count2 = ((count2/0xA) | 0x30);
			                 a_count2 = ((count2 % 0xA) | 0x30);
			                 LCD_data(a_count1);
			              	 LCD_data(a_count2);
			              	 if(UP_Pin==0)
			              	 {
			              	  count2=count2+1;
			              	  n=0;
			              	  }

			              	 if(Down_Pin==0)
			             	   {
			              		  count2=count2-1;
			             		  n=0;
			                	  }
			              	 break;

			              case 3:
			            	  LCD_String_Display("M301: Enter Password");
			            	  LCD_command(0xC0);
			            	  a_count3 = ((count3/0xA) | 0x30);
			            	  a_count3 = ((count3 % 0xA) | 0x30);
			            	  LCD_data(a_count1);
			            	  LCD_data(a_count2);
			                   LCD_data(a_count3);

			                   if(UP_Pin==0)
			                	 {
			                     count3=count3+1;
			                     n=0;
			                      }

			                   if(Down_Pin==0)
			                  	  {
			                  	    count3=count3-1;
			                  	    n=0;
			                  	   }

			                   break;
			              case 4:
			            	  LCD_String_Display("M301: Enter Password");
			            	  LCD_command(0xC0);
			            	  a_count4 = ((count4/0xA) | 0x30);
			            	  a_count4 = ((count4 % 0xA) | 0x30);
			            	  LCD_data(a_count1);
			            	  LCD_data(a_count2);
			            	  LCD_data(a_count3);
			            	  LCD_data(a_count4);
			            	  if(UP_Pin==0)
			            	 	 {
			            	 		 count4=count4+1;
			            	 		 n=0;
			            	     }
			            	  if(Down_Pin==0)
			            	 	 {
			            	 	    count4=count4-1;
			            	         n=0;
			            	 	  }

                              break;

			              case 5:

			            	  if (count == count1 + count2 + count3 + count4)
			            	  {
			            		  LCD_String_Display("M302: RTC Setting");

			            		  LCD_command(0xC0);

			            		  min1 = ((tmin/0xA) | 0x30);
			            		 			 	LCD_data(min1);
			            		          min2 = ((tmin % 0xA) | 0x30);
			            		 			 	LCD_data(min2);

			            		 	  if(UP_Pin==0)
			            		 	   {
			            		 		   tmin=tmin+1;

			            		 	   }
			            		 	 if(Down_Pin==0)
			            		 	 {
			            		 		 tmin=tmin-1;

			            		 	 }

			            		 	 min3 = ((min1 - 0x30)*0xA) + ((min2 - 0x30));
                                   //  t=0;


			            	  }
			            	  else
			            	  {

			            		 LCD_String_Display("M301: Enter Password");
			            		 LCD_command(0xC0);
			            	     LCD_String_Display("Wrong Password");

			            	  }
			            	  break;

			              case 6:
			            	//  min1 = ((a_count5_x - 0x30)*0xA) + ((a_count5_y - 0x30));
			            	  rtcwrite();
                              d=5;
                             // count1=0;
                          //    count2=0;
                          //    count3=0;
                          //    count4=0;

			            	  break;
                       }
            	}






	else if (k==3)
		  {
			       switch(n)

						  {
			                   case 0:
			      			    	 LCD_String_Display("M101: I/P Voltage");
			      			         LCD_command(0xC0);
			      			         LCD_String_Display("Vin : 90 V");
			      			    	 break;

			      			     case 1:
			      			    	  LCD_String_Display("M102:I/P Current");
			      			    	  LCD_command(0xC0);
			      			    	  LCD_String_Display("Iin : 200 A");
			      			    	  break;

			      			     case 2:
			      			    	   n=0;
			      			    	   LCD_String_Display("M101: I/P Voltage");
			      			    	   LCD_command(0xC0);
			      			    	   LCD_String_Display("Vin : 90 V");
			      			    	   break;

			      			     case -1:
			      			    	   n=1;
			      			    	   LCD_String_Display("M102:I/P Current");
			      			    	   LCD_command(0xC0);
			      			    	   LCD_String_Display("Iin : 200 A");
			      			    	   break;

						     }
	        }
}



 void display()//loop to define the display, when clock is not being displayed.
    {
	switch(k)
	     {
	         case 0:
	    		 mode();
	    		 break;

	         case 1:

	    		 mode();
	    	     break;

	    	  case 2:
	    		  mode();
	    	     break;

	    	  case 3:
	    		  k=0;
	    		  mode();
	    		  break;
	    		   }

	SysCtlDelay(2000000);

}





void keycheck()//checking the status of the keys pressed
{
	m0=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_0);
	m1=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_1);
	m2=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_2);
	m3=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_3);

	//if(m0==0| m1==0 | m2==0)//checking the buttons
		if(m0==0)
		//dont use m3 i.e button 4th(as it is being used for reverting back to orginal conditions)
		{
			m=0;//value to intialize the interrupt.

		}
		else
	{
		m=1;
	}

	uint32_t ui32Period;


	 SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
	 TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
	 if ( m==0)//timer interrupt being enabled at a particular
	 {
	 	ui32Period = (SysCtlClockGet()/10)/2;
	 	TimerLoadSet(TIMER0_BASE, TIMER_A, ui32Period -1);

	 	IntEnable(INT_TIMER0A);
	 	TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
	 	IntMasterEnable();

	 	TimerEnable(TIMER0_BASE, TIMER_A);
	     while(m==0)
	          {

	            }

	 }
}

void Timer0IntHandler()
{
	clear();
	TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
	Mode_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_0);
	UP_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_1);
	Down_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_2);
    Enter_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_3);
	//if(Down_Pin==0| UP_Pin==0| Mode_Pin==0)

	if(Mode_Pin==0)
	{
		while(e<20 && scan<80)
			//while(1)

		{
			clear();
		    down();//caliing the function to naviagte downwards
		    up();//caliing the function to naviagte upwards
		    display();//caliing the function to display the funtion
		    select();
		    enter();
		    scan=scan+1;
		    SysCtlDelay(5000);
		    Enter_Pin=GPIOPinRead(GPIO_PORTE_BASE, GPIO_PIN_3);
	     }


	}
	   else if(e>=20)
	{
	        m++;//initailizing the values
			k=0;//initailizing the values
			n=0;//initailizing the values
			e=0;
			scan=0;
	}
	   else if(scan>=80)
	   	{
	   	        m++;//initailizing the values
	   			k=0;//initailizing the values
	   			n=0;//initailizing the values
	   			e=0;
	   			scan=0;
	   	}

}

int main()
{
	 ROM_SysCtlClockSet (SYSCTL_SYSDIV_16|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN);

	 SysCtlDelay(SysCtlClockGet()/5000);

     SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

     SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);

     SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);

     GPIOPinTypeGPIOOutput(GPIO_PORTB_BASE,GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);

     GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE,GPIO_PIN_6|GPIO_PIN_7);

     GPIOPinTypeGPIOInput(GPIO_PORTE_BASE, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);

     LCD_Init();

     clear();

     LCD_String_Display("     We Answer   ");

     SysCtlDelay(2000000);

     SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);

     TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);

	 SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

	 SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);

	 GPIOPinTypeGPIOOutput(GPIO_PORTB_BASE,GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3);

	 GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE,GPIO_PIN_6|GPIO_PIN_7);

    LCD_Init();

	 clear();

	 initI2C();

//    ConfigureUART();

    clear();

    mode();

    keycheck();


	GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6|GPIO_PIN_7,0x00);

	while (1)
	{
	while(t==0)
	{
     keycheck();

     mode();

	I2CMasterSlaveAddrSet(I2C2_BASE, SLAVE_ADDRESS, false);

	I2CMasterDataPut(I2C2_BASE,0);  // 29_7

	I2CMasterSlaveAddrSet(I2C2_BASE, SLAVE_ADDRESS, false);  // 29_7

	I2CMasterDataPut(I2C2_BASE,0);  // 29_7

	I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_SEND_START);  // comment when you dont want to change time

	while(I2CMasterBusy(I2C2_BASE));

    ROM_SysCtlDelay(3000);

    I2CMasterDataPut(I2C2_BASE,dec2bcd(sec)); //29_7

    I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);  //29_7

    while(I2CMasterBusy(I2C2_BASE));

    ROM_SysCtlDelay(3000);

    I2CMasterDataPut(I2C2_BASE,dec2bcd(min));

    I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);

    while(I2CMasterBusy(I2C2_BASE));

    ROM_SysCtlDelay(3000);

    I2CMasterDataPut(I2C2_BASE,dec2bcd(hour));  //29_7

    I2CMasterControl(I2C2_BASE,I2C_MASTER_CMD_BURST_SEND_CONT);  //29_7

    while(I2CMasterBusy(I2C2_BASE));

    ROM_SysCtlDelay(3000);

    I2CMasterDataPut(I2C2_BASE,dec2bcd(day));

    I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_SEND_CONT);

    while(I2CMasterBusy(I2C2_BASE));

    ROM_SysCtlDelay(3000);

    I2CMasterDataPut(I2C2_BASE,dec2bcd(date));

    I2CMasterControl(I2C2_BASE,I2C_MASTER_CMD_BURST_SEND_CONT);

    while(I2CMasterBusy(I2C2_BASE));

     ROM_SysCtlDelay(3000);

    I2CMasterDataPut(I2C2_BASE,dec2bcd(month));

    I2CMasterControl(I2C2_BASE,I2C_MASTER_CMD_BURST_SEND_CONT);

    while(I2CMasterBusy(I2C2_BASE));

     ROM_SysCtlDelay(3000);

    I2CMasterDataPut(I2C2_BASE,dec2bcd(year));

    I2CMasterControl(I2C2_BASE,I2C_MASTER_CMD_BURST_SEND_FINISH);

    while(I2CMasterBusy(I2C2_BASE));

     ROM_SysCtlDelay(3000);

     t=1;
	}

 //while(1)

// {
	 keycheck();

	 I2CMasterSlaveAddrSet(I2C2_BASE, SLAVE_ADDRESS, false);

	 I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_SEND_START);

	 while(I2CMasterBusy(I2C2_BASE));

	 ROM_SysCtlDelay(3000);

	 I2CMasterDataPut(I2C2_BASE,0x00);

	 while(I2CMasterBusy(I2C2_BASE));

	 ROM_SysCtlDelay(3000);

	 I2CMasterSlaveAddrSet(I2C2_BASE, SLAVE_ADDRESS, true);

	 I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_START);

	 while(I2CMasterBusy(I2C2_BASE));

	 ROM_SysCtlDelay(3000);

	 sec = I2CMasterDataGet(I2C2_BASE);

	 I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);

	 while(I2CMasterBusy(I2C2_BASE));

	 ROM_SysCtlDelay(3000);

     min = I2CMasterDataGet(I2C2_BASE);

	 I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);

	 while(I2CMasterBusy(I2C2_BASE));

	 ROM_SysCtlDelay(3000);

	 hour = I2CMasterDataGet(I2C2_BASE);

	 I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);

	 while(I2CMasterBusy(I2C2_BASE));

	 ROM_SysCtlDelay(3000);

	 day = I2CMasterDataGet(I2C2_BASE);

	 I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);

    while(I2CMasterBusy(I2C2_BASE));

	 date = I2CMasterDataGet(I2C2_BASE);

	 ROM_SysCtlDelay(3000);

	 I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);

	 while(I2CMasterBusy(I2C2_BASE));

	 ROM_SysCtlDelay(3000);

	 month = I2CMasterDataGet(I2C2_BASE);

	 I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_CONT);

	 while(I2CMasterBusy(I2C2_BASE));

	 ROM_SysCtlDelay(3000);

	 year = I2CMasterDataGet(I2C2_BASE);

	 I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_RECEIVE_FINISH);

	 while(I2CMasterBusy(I2C2_BASE));


	 ROM_SysCtlDelay(3000);

	 tsec = bcd2dec(sec)&0x7f;

	 tmin = bcd2dec(min);

	 thour = bcd2dec(hour)&0x3f;

	 tday = bcd2dec(day);

	 tdate = bcd2dec(date);

	 tmonth = bcd2dec(month);

	 tyear = bcd2dec(year);

	 DOW = tday;

	 if(Last_Value != tsec)
	 {

		 clear();

         if (thour<= 23)
         {
		 lhour = ((thour/0xA) | 0x30);
		 		LCD_data(lhour);
		 lhour = ((thour % 0xA) | 0x30);
		 		LCD_data(lhour);
         }
         else
         {
        	 thour = 0;
        	 lhour = ((thour/0xA) | 0x30);
        	 		 LCD_data(lhour);
        	  lhour = ((thour % 0xA) | 0x30);
        	 		 LCD_data(lhour);
         }

		 LCD_data(58);

		 if (tmin<=59)
		 {

		 lmin = ((tmin/0xA) | 0x30);
			 	LCD_data(lmin);
         lmin = ((tmin % 0xA) | 0x30);
			 	LCD_data(lmin);
		 }
		 else
		 {
			 tmin = 0;
			 lmin = ((tmin/0xA) | 0x30);
			 		LCD_data(lmin);
			 lmin = ((tmin % 0xA) | 0x30);
			 		 LCD_data(lmin);
		 }


		LCD_data(58);

		if (tsec<=59)
		{
		 lsec = ((tsec/0xA) | 0x30);
			 	LCD_data(lsec);
		 lsec = ((tsec % 0xA) | 0x30);
			 	LCD_data(lsec);
		}

		else

		{
			tsec=0;
			lsec = ((tsec/0xA) | 0x30);
				    LCD_data(lsec);
		    lsec = ((tsec % 0xA) | 0x30);
					 LCD_data(lsec);
		}

		LCD_command(0xC0);

		ldate = ((tdate/0xA) | 0x30);
				LCD_data(ldate);
	    ldate = ((tdate % 0xA) | 0x30);
				LCD_data(ldate);

		LCD_data(47);

		lmonth = ((tmonth/0xA) | 0x30);
				 LCD_data(lmonth);
		lmonth = ((tmonth % 0xA) | 0x30);
				 LCD_data(lmonth);

		LCD_data(47);

		lyear = ((tyear/0xA) | 0x30);
				LCD_data(lyear);
		lyear = ((tyear % 0xA) | 0x30);
				LCD_data(lyear);

		LCD_data(32);

		switch(DOW)
		    		   {
		    		   case 1:
		    			   LCD_String_Display("Sun");
		    			        break;

		    		   case 2:
		    			   LCD_String_Display("Mon");
		    		            break;

		    		   case 3:
		    			   LCD_String_Display("Tue");
		    			       break;

		    		   case 4:
		    		       LCD_String_Display("Wed");
		    		  		   break;

		    		   case 5:
		    		  	   LCD_String_Display("Thu");
		    		  		   break;

		    		   case 6:
		    		  	   LCD_String_Display("Fri");
		    		  		   break;

		    		   case 7:
		    		 	  LCD_String_Display("Sat");
		    		 		   break;

		    		   }


		Last_Value = tsec;
		 tsec = 0;
		 keycheck();

	 }

	 else
		     {

		    	I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_SEND_ERROR_STOP);
		     }

 }


}

//}

void initI2C()
{

	ROM_SysCtlPeripheralReset(SYSCTL_PERIPH_I2C2);


	ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_I2C2);


    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);


    GPIOPinTypeI2CSCL(GPIO_PORTE_BASE, GPIO_PIN_4);


    ROM_GPIOPinTypeI2C(GPIO_PORTE_BASE, GPIO_PIN_5);


    ROM_GPIOPinConfigure(GPIO_PE4_I2C2SCL);


    ROM_GPIOPinConfigure(GPIO_PE5_I2C2SDA);

    I2CMasterInitExpClk(I2C2_BASE, SysCtlClockGet(), false);

   ROM_SysCtlDelay(100000);
}

unsigned char dec2bcd(unsigned char val)
{
	return ((val/0xA*0x10)+(val%0xA));
}

unsigned char bcd2dec(unsigned char val)
{
	return ((val/0x10*0xA)+(val%0x10));
}

Sorry for lots of code.
I do not understand how to change the time through keypad. Please share if someone has some idea.

Thank you.

over 10 years ago

0 Amit Ashara over 10 years ago

TI__Guru**** 244400 points

Hello Anup,

Are you using an external RTC? Did you check the scope for the I2C transaction being programmed when written and read back to see if it matches the RTC device requirements?

Regards
Amit

0 anupsingh chandel over 10 years ago in reply to Amit Ashara

Expert 1385 points

Hello Amit,

Yes I am using external RTC. Now the problem is solved. Thank you for your suggestions.

0 Amit Ashara over 10 years ago in reply to anupsingh chandel

TI__Guru**** 244400 points

Hello Anup

What was the issue?

Regards
Amit

0 anupsingh chandel over 10 years ago in reply to Amit Ashara

Expert 1385 points

Hello Amit,

Actually my C program logic was wrong. Actually after changing the time it was not calling the I2CMasterControl(I2C2_BASE, I2C_MASTER_CMD_BURST_SEND_START) command. So new values were not writing on RTC. Now I call the function RTC_write whenever there is change in RTC time /date by user key.

Thank you for your question. It gave the idea to check the data.

regards,
Anup

0 cb1 over 10 years ago in reply to anupsingh chandel

Guru 47900 points

Thank you for that detail, my friend. Surely Amit, others, myself appreciate the time & effort you've spent which make the forum more valuable to all.

Now - in the attempt to "generalize" your issue so that others may benefit across many MCU peripherals:

this vendor's API is so broad that sometimes the various function names may not fully/properly describe the function's intent. (some here may note that as, "Code & Pray!"). Employing some monitoring device (scope ideally - but even a "latching Led" may serve) users can confirm that their function calls actually do generate output - and w/bit more probing & focus - can usually determine the output's "suitability to task."
Our firm for some time - and more recently Amit here (w/in the "Tell T.I." post up top) describe & illustrate how scope captures may be "tied" to critical functions - which vastly speeds & eases troubleshooting - downstream.
to best exploit such quick MCU "sanity checks" our firm employs several "stylized" GPIO/special function monitors which always attach via a common header - and which quickly/easily confirm that the called functions perform as we (hope) or expect...

We've often observed clients - who "protest" the time/effort required to create such "stylized" test boards - spend huge amounts of time/effort due to failed or improper "haywire" test connections & methodology.

The ability to "reuse" a known good item "pays for itself" in short order. - unique, rapidly deployed "clip ons" - in time - cost far more in lost productivity than a proper "stylized" small board.

0 Amit Ashara over 10 years ago in reply to anupsingh chandel

TI__Guru**** 244400 points

Hello Anup

Thank you for the resolution thread.

Regards
Amit

Arm-based microcontrollers

Arm-based microcontrollers forum

Tiva C Launchpad 123gxl, connected with RTC, keypad and LCD display, time change in RTC through keypad