main.c

掏美元培训得来的某外国公司推广keil ARM 和LPC2100的源码。

/************************************************************/
/* PROJECT NAME: Thumb	                                    */
/* Project:      LPC2100 Training course                    */
/* Engineer:     T Martin     [e-mail]           */
/* Filename:     main.c                                     */
/* Language:     C                      	                */
/* Compiler:     Keil ARM	V2.00b		                    */
/* Assembler:    				                            */
/*                                                          */
/************************************************************/
/* COPYRIGHT: Hitex UK Ltd 		2005						*/
/* LICENSE:   THIS VERSION CREATED FOR FREE DISTRIBUTION	*/
/************************************************************/
/* Function:                                                */
/*                                                          */
/*															*/
/* Demonstrates Timer 0 match interrupt and simple PWM   	*/
/* modulation												*/	
/*															*/
/* Oscillator frequency 12.000 Mhz							*/
/* Target board Keil MCB2100								*/
/************************************************************/

#include <LPC21xx.H> 

void T0isr(void)	__irq;


int main(void)
{
VPBDIV		= 0x00000002;			// Configure the  VPB divi
						  	
PINSEL0 	|= 0x00000800;			//Match1 as output
T0PR 		= 0x0000001E;			//Load prescaler
T0TCR 		= 0x00000002;			//Reset counter and prescaler
T0MCR 		= 0x00000003;			//On match reset the counter and generate an interrupt
T0MR0		= 0x00000101;			//Set the cycle time
T0MR1		= 0x00000000;			// Set duty cycle to zero
T0EMR  		= 0x00000042;			//On match clear MAT1
T0TCR 		= 0x00000001;			//enable timer

VICVectAddr4 = (unsigned)T0isr;		//Set the timer ISR vector address
VICVectCntl4 = 0x00000024;			//Set channel
VICIntEnable |= 0x00000010;			//Enable the interrupt

while(1);
}

void T0isr (void)	__irq
{
T0EMR 		|= 0x00000002;			//Set MAT1 high for begining of the cycle

T0MR1++;							//Increment PWM Duty cycle 
T0MR1 		= T0MR1&0x000000FF;		//Limit duty cycle

T0IR 		|= 0x00000001;			//Clear match 0 interrupt
VICVectAddr = 0x00000000;			//Dummy write to signal end of interrupt
}