pwm.lst

PWM Example for Philips LPC2

ARM COMPILER V0.12,  PWM                                                                   08/10/04  14:12:24  PAGE 1   


ARM COMPILER V0.12, COMPILATION OF MODULE PWM
OBJECT MODULE PLACED IN .\Flash\PWM.obj
COMPILER INVOKED BY: C:\Keil\ARM\BIN\CA.exe PWM.c THUMB OPTIMIZE(7,SPEED) BROWSE DEBUG PRINT(.\FLASH\PWM.LST) TABS(4) OB
                    -JECT(.\Flash\PWM.obj) 

stmt  level    source

    1          /******************************************************************************/
    2          /*  This file is part of the uVision/ARM development tools                    */
    3          /*  Copyright KEIL ELEKTRONIK GmbH 2002-2004                                  */
    4          /******************************************************************************/
    5          /*                                                                            */
    6          /*  PWM.C:  LED Flasher                                                    */
    7          /*                                                                            */
    8          /******************************************************************************/
    9                            
   10          #include <LPC21xx.H>                       /* LPC21xx definitions  */
   11          
   12          void PWM0_isr(void)  __irq
   13          {
   14   1        PWMIR       |= 0x00000001;               /* Clear match0 interrupt */
   15   1        VICVectAddr  = 0x00000000;
   16   1      }
   17          
   18          
   19          void poll_ADC (void) {                     /* Get ADC Value and set PWM */
   20   1        unsigned int cnt;
   21   1        unsigned int val; 
   22   1        static unsigned int oldval;
   23   1      
   24   1        ADCR |= 0x01000000;                      /* Start A/D Conversion */
   25   1        do {
   26   2          val = ADDR;                            /* Read A/D Data Register */
   27   2        } while ((val & 0x80000000) == 0);       /* Wait for end of A/D Conversion */
   28   1        ADCR &= ~0x01000000;                     /* Stop A/D Conversion */
   29   1        val = (val >> 6) & 0x03FF;               /* Extract AIN0 Value */
   30   1      
   31   1        if ((val != oldval)) { 
   32   2          PWMMR2 = val;                               
   33   2          PWMLER = 0x4;                          /* Enable Shadow latch */
   34   2          oldval = val; 
   35   2        }
   36   1      }
   37          
   38          
   39          void init_PWM (void) {
   40   1      
   41   1        VICVectAddr8 = (unsigned)PWM0_isr;        /* Set the PWM ISR vector address */
   42   1        VICVectCntl8 = 0x00000028;                /* Set channel */
   43   1        VICIntEnable = 0x00000100;                /* Enable the interrupt */
   44   1      
   45   1        PINSEL0 |= 0x00028008;                    /* Enable P0.7 and P0.1 as PWM output */
   46   1        PWMPR    = 0x00000000;                    /* Load prescaler  */
   47   1        
   48   1        PWMPCR = 0x00000C0C;                      /* PWM channel 2 & 3 double edge control, output enabled */
   49   1        PWMMCR = 0x00000003;                      /* On match with timer reset the counter */
   50   1        PWMMR0 = 0x400;                           /* set cycle rate to sixteen ticks       */
   51   1        PWMMR1 = 0;                               /* set rising  edge of PWM2 to 100 ticks    */
   52   1        PWMMR2 = 0x200;                           /* set falling edge of PWM2 to 200 ticks   */
   53   1        PWMMR3 = 0x400;                           /* set rising  edge of PWM3 to 100 ticks    */
   54   1        PWMLER = 0xF;                             /* enable shadow latch for match 1 - 3   */ 
   55   1        PWMEMR = 0x00210A8E;                      /* Match 1 and Match 2 outputs set high  */
   56   1        PWMTCR = 0x00000002;                      /* Reset counter and prescaler           */ 
   57   1        PWMTCR = 0x00000009;                      /* enable counter and PWM, release counter from reset */
   58   1      }
ARM COMPILER V0.12,  PWM                                                                   08/10/04  14:12:24  PAGE 2   

   59          
   60          
   61          int main (void) {
   62   1        unsigned int n;
   63   1        int rx_char;
   64   1      
   65   1        IODIR1 = 0x00FF0000;                      /* P1.16..23 defined as Outputs  */
   66   1        ADCR   = 0x01200401;                      /* Setup A/D: 10-bit AIN0 @ 3MHz */
   67   1        init_PWM();
   68   1      
   69   1        while (1) {                               /* Loop forever */
   70   2          poll_ADC();     
   71   2        }
   72   1      }

ARM COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)