delay.c

ARM LPC2148 uart coding...

/*****************************************************/
/* Target MCU  : Philips ARM7-LPC2103                */
/* X-TAL       : 19.6608 MHz                         */
/*             : Run Speed 58.9824MHz (With PLL)     */
/* Keil Editor : uVision3 V3.03a                     */
/* Compiler    : Keil CARM V2.50a		             */
/* Create By   : Pascal Gubler                       */
/* Last Update : 04-09-2006 KMIT North Bankok   	 */
/*             : WWW.KMITNB.AC.TH                    */
/* Function    : Delay Functions for Robotic Purposes*/
/*****************************************************/

//*Specifications
//***************
//* MAT0.3 = Delay in s/ms/us  (NoPortConnected)
//*	MAX Delay 15s!
//* --> Ports are not Connected
//* --> Timer 0 is used for Delay Functions

#include "LPC214x.H" // LPC2148 MPU Register



//*********************************/;
//* Initialize the Timer          */;
//*********************************/;
void init_delay(void){

//Initial Timer Operate 
  T0TCR   &= 0xFFFFFFFE;
  T0TC     = 0x00000000;  	// Timer Start = 0
  T0PR     = 0x00000000;  	// Prescale = 0
  T0PC     = 0x00000000;   	// Prescale Count = 0

//Initial Timer0 Match Operate 
  T0MCR	  &= 0xFFFE;	// Disable Interrupt on Match-0 (1111 1111 1111 111x)
  T0MCR   &= 0xFFFD;	// Disable Reset TC on Match-0	(1111 1111 1111 11x1)
  T0MCR   &= 0xFFFB;	// Disable Stop TC on Match-0	(1111 1111 1111 1x11)
  T0MCR	  &= 0xFFF7;	// Disable Interrupt on Match-1	(1111 1111 1111 x111)
  T0MCR   &= 0xFFEF;	// Disable Reset TC on Match-1	(1111 1111 111x 1111)
  T0MCR   &= 0xFFDF;	// Disable Stop TC on Match-1	(1111 1111 11x1 1111)
  T0MCR	  &= 0xFFBF;	// Disable Interrupt on Match-2	(1111 1111 1x11 1111)
  T0MCR   &= 0xFF7F;	// Disable Reset TC on Match-2	(1111 1111 x111 1111)
  T0MCR   &= 0xFEFF;	// Disable Stop TC on Match-2 	(1111 111x 1111 1111)
  T0MCR	  |= 0x0800;	// Enable  Stop TC on Match-3	(0000 x000 0000 0000)
  T0MCR   |= 0x0400;	// Enable  Reset TC on Match-3	(0000 0x00 0000 0000)
  T0MCR   &= 0xFDFF;	// Disable Interrupt on Match-3 (1111 x111 1111 1111)

//Initial Timer0 Interrupt 
  T0IR &= 0xFE;  	// Disable MAT0 Interrupt (1111111x)
  T0IR &= 0xFD;  	// Disable MAT1 Interrupt (111111x1)
  T0IR &= 0xFB;  	// Disable MAT2 Interrupt (11111x11)
  T0IR &= 0xF7;  	// Disable MAT3 Interrupt (1111x111)
  T0IR &= 0xEF;  	// Disable CAP0 Interrupt (111x1111)
  T0IR &= 0xDF;  	// Disable CAP1 Interrupt (11x11111)
  T0IR &= 0xBF;  	// Disable CAP2 Interrupt (1x111111)

//Initial Timer0 External Match Register 
  T0EMR  = 0x000; //Set States to 0000                  0000 0000 0000  
  T0EMR |= 0x800; //Set Match0.3 to Go High on Match	10xx xxxx xxxx
  T0EMR &= 0xCFF; //Set Match0.2 to Do Nothing on Match xx00 xxxx xxxx
  T0EMR &= 0xF3F; //Set Match0.1 to Do Nothing on Match xxxx 00xx xxxx
  T0EMR &= 0xFCF; //Set Match0.0 to Do Nothing on Match xxxx xx00 xxxx
}


//*********************************/;
//* Delay Function [Microseconds] */;
//*********************************/;
void delay_us(unsigned int val){

  T0MR3 = val*29;
  T0EMR &= 0xFFFFFFF7;
  T0TC     = 0x00000000;
  T0TCR=1;
  while((T0EMR & 0x00000008)==0);
}


//************************************/
//* Delay Function [Miliseconds]     */
//************************************/
void delay_ms(unsigned int val){

  T0MR3 = val*29498;
  T0EMR &= 0xFFFFFFF7;
  T0TC     = 0x00000000;
  T0TCR=1;
  while((T0EMR & 0x00000008)==0);						
}


//************************************/
//* Delay Function [Seconds]         */
//************************************/
void delay_s(unsigned int val){

  T0MR3 = val*29498500;
  T0EMR &= 0xFFFFFFF7;
  T0TC     = 0x00000000;
  T0TCR=1;
  while((T0EMR & 0x00000008)==0); 
  							
}