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Question about keypad?

I had post a same message before.
Timer0 scan a 3*4's keypad with 10mS Interval,and var Key will be changed to a value when button be pressed or 0xff when all buttons be unprssed.Every button include 4 letters,like,one button has '1','a','b','c'and another has '2','d','e','f'. How i can realize these as a keypad on mobilephone,as press button '1' once Key == '1',and double press it quickly Key == 'a',etc?can you give me some source code for exsample?
Best regards,
Nanntiangumo

Parents

0 Nantian Gumo over 19 years ago in reply to Andy Neil

The first thinking as following :

void Timer0(void) interrupt 1
{
		if (bKeyDwF == 1 && bKeyRdyF == 1)	 		//Twice scan finished
        {
			cCount ++;
			if (KeyTemp0 == KeyTemp1)		 		// scan result being same would changed value to var Key
                Key = KeyTemp0;
	            else Key = 0xff;			 		// Or Key would be changed to NUll (0xff)
			bKeyFree = 0;
            bKeyDwF = 0;
            bKeyRdyF = 0;
 		}

        if (bKeyDwF == 1 && bKeyRdyF == 0)	 		//Scanning a Key the second time
        {
            KeyTemp1 = Scan();
            bKeyRdyF = 1;
        }

        if (bKeyDwF == 0 && bKeyRdyF == 0)	 		//Scanning a Key the first time
        {
            KeyTemp0 = Scan();
            bKeyDwF = 1;
        }





		if (Key == 0xff )
		{
			bFF = 1;	    						//Set unpressed Flag;
		}
		if (Key != ETB && Key != ESC &&	Key != SPR && Key != PDW && Key != 0xff)
		{
			if (bLetterNum == 0)					//Resolve Keys in Letter mode
			{
				if (Key != cKeyTemp)   				//A new Key pressed;
				{
					cKeyTemp = Key;	   				// Key value be taken to  buf;
					cHarKey = KBChar[Key][0];  		//Return the key 's first value ;
					cCount = 0;
				}
				else 				 				//The same Key pressed ;
					{
						if(bFF == 1)  				//The same Key unpressed ;
						{
							cCount = 0;
							cHarKey = KBChar[Key][cKBCount];  			// Return the Key 's another value
							if (cKBCount < 3)
							{
								cKBCount ++;
							}
							else
								{
									cKBCount = 0;
								}
							bFF = 0;									//Clear unpressed Flag;
						}


					}
			}
			else if (bLetterNum == 1)	 								//Resolve Keys in Number mode
				{
					if (Key != cKeyTemp) 								//A new Key pressed;
					{
						cKeyTemp = Key;
						cHarKey = KBChar[Key][0];  						// Return the Key 's first value ;
						cCount = 0;
					}
					else 			   									// The same Key pressed ;
						{
							if (bFF == 1) 								// The same Key unpressed;
							{
								cCount = 0;
								if (Key == 0 || Key == 9)				//Resolve mutil_value Key
								{
									if (Key == 0 )
									{
										if (cKBCount != 0)
										{
											cHarKey = '-';	  			//Return the NEG symbol;
										}
										else
										{
											cHarKey = '0';
										}

									}
									else if (Key == 9)
										{
											if (cKBCount != 0)
											{
												cHarKey = '.';	  		// Return the value point
											}
											else
												{
													cHarKey = '9';
												}
										}

									if (cKBCount < 1)			 		// The mutil_value Key counter;
									{
										cKBCount ++;
									}
									else
										{
											cKBCount = 0;
										}
								}
								else
									{
										cHarKey = KBChar[Key][0];  		//Not mutil_value Key,return the Key 's first
									}							   		//value immediately;
								bFF = 0;  // Clear unpressed flag;

							}



						}

				}


		 	if (cCount == 8)  											//The same Key pressed 8 times
			{
				bValKey = 1;  											// Set the valid Key 's flag,CHARKEY would be main() taken to resolve;
			}
		}

}

Reply

0 Nantian Gumo over 19 years ago in reply to Andy Neil

The first thinking as following :

void Timer0(void) interrupt 1
{
		if (bKeyDwF == 1 && bKeyRdyF == 1)	 		//Twice scan finished
        {
			cCount ++;
			if (KeyTemp0 == KeyTemp1)		 		// scan result being same would changed value to var Key
                Key = KeyTemp0;
	            else Key = 0xff;			 		// Or Key would be changed to NUll (0xff)
			bKeyFree = 0;
            bKeyDwF = 0;
            bKeyRdyF = 0;
 		}

        if (bKeyDwF == 1 && bKeyRdyF == 0)	 		//Scanning a Key the second time
        {
            KeyTemp1 = Scan();
            bKeyRdyF = 1;
        }

        if (bKeyDwF == 0 && bKeyRdyF == 0)	 		//Scanning a Key the first time
        {
            KeyTemp0 = Scan();
            bKeyDwF = 1;
        }





		if (Key == 0xff )
		{
			bFF = 1;	    						//Set unpressed Flag;
		}
		if (Key != ETB && Key != ESC &&	Key != SPR && Key != PDW && Key != 0xff)
		{
			if (bLetterNum == 0)					//Resolve Keys in Letter mode
			{
				if (Key != cKeyTemp)   				//A new Key pressed;
				{
					cKeyTemp = Key;	   				// Key value be taken to  buf;
					cHarKey = KBChar[Key][0];  		//Return the key 's first value ;
					cCount = 0;
				}
				else 				 				//The same Key pressed ;
					{
						if(bFF == 1)  				//The same Key unpressed ;
						{
							cCount = 0;
							cHarKey = KBChar[Key][cKBCount];  			// Return the Key 's another value
							if (cKBCount < 3)
							{
								cKBCount ++;
							}
							else
								{
									cKBCount = 0;
								}
							bFF = 0;									//Clear unpressed Flag;
						}


					}
			}
			else if (bLetterNum == 1)	 								//Resolve Keys in Number mode
				{
					if (Key != cKeyTemp) 								//A new Key pressed;
					{
						cKeyTemp = Key;
						cHarKey = KBChar[Key][0];  						// Return the Key 's first value ;
						cCount = 0;
					}
					else 			   									// The same Key pressed ;
						{
							if (bFF == 1) 								// The same Key unpressed;
							{
								cCount = 0;
								if (Key == 0 || Key == 9)				//Resolve mutil_value Key
								{
									if (Key == 0 )
									{
										if (cKBCount != 0)
										{
											cHarKey = '-';	  			//Return the NEG symbol;
										}
										else
										{
											cHarKey = '0';
										}

									}
									else if (Key == 9)
										{
											if (cKBCount != 0)
											{
												cHarKey = '.';	  		// Return the value point
											}
											else
												{
													cHarKey = '9';
												}
										}

									if (cKBCount < 1)			 		// The mutil_value Key counter;
									{
										cKBCount ++;
									}
									else
										{
											cKBCount = 0;
										}
								}
								else
									{
										cHarKey = KBChar[Key][0];  		//Not mutil_value Key,return the Key 's first
									}							   		//value immediately;
								bFF = 0;  // Clear unpressed flag;

							}



						}

				}


		 	if (cCount == 8)  											//The same Key pressed 8 times
			{
				bValKey = 1;  											// Set the valid Key 's flag,CHARKEY would be main() taken to resolve;
			}
		}

}

Children

0 erik malund over 19 years ago in reply to Nantian Gumo

basic keypad code (assuping you drive columns and read rows.
1) feed all columns, if no row,: no key
2) scan columns till row active = key found
3) at exit if now_key is not = prev_key ignore
4) if 2 identical reads and result different from last key presented present key.

Erik
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