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Systemclockupdate

Divya Chinnan

I need to generate PWM signal in cortex-M3. With timer example program i changed some part of the code. While compiling i was having one warning as systemclockupdate. While building the target is not created. Please help me.

Thank You.

Parents
  • 0 in reply to Ash J

    Oki sir. I ,ll check it out. Anyway i ll show my code.

    void TIMER0_IRQHandler (void)
    { if ( LPC_TIM0->IR & (0x1<<0) )
    { LPC_TIM0->IR = 0x1<<0;
    timer0_m0_counter++;
    if ( ( LPC_TIM0->TCR == TIME_INTERVALmS * 15) )
    { reset_timer( 0 );
    enable_timer (0);
    LPC_TIM0->MR0 = TIME_INTERVALmS * 1;
    LPC_GPIO0->FIOSET|=(1<<21);
    LPC_GPIO1->FIOSET = 1<<29;
    } if (LPC_TIM0->TC == TIME_INTERVALmS * 1 )
    { reset_timer( 0 );
    enable_timer (0);
    LPC_GPIO0->FIOCLR|=(1<<21);
    LPC_GPIO1->FIOCLR = 1<<29;
    LPC_TIM0->MR0 = TIME_INTERVALmS * 15;
    } }
    if ( LPC_TIM0->IR & (0x1<<1) )
    { LPC_TIM0->IR = 0x1<<1;
    timer0_m1_counter++;
    } if ( LPC_TIM0->IR & (0x1<<4) )
    { LPC_TIM0->IR = 0x1<<4;
    timer0_capture0++;
    } if ( LPC_TIM0->IR & (0x1<<5) )
    { LPC_TIM0->IR = 0x1<<5;
    timer0_capture1++;
    } return;
    }

    uint32_t init_timer ( uint8_t timer_num, uint32_t TimerInterval )
    { uint32_t pclkdiv, pclk;
    if ( timer_num == 0 )
    { timer0_m0_counter = 0;
    timer0_m1_counter = 0;
    timer0_capture0 = 0;
    timer0_capture1 = 0;
    LPC_SC->PCONP |= (0x01<<1);
    #if TIMER_MATCH
    LPC_PINCON->PINSEL3 &= ~((0x3<<24)|(0x3<<26));
    LPC_PINCON->PINSEL3 |= ((0x3<<24)|(0x3<<26));
    #else
    LPC_PINCON->PINSEL3 &= ~((0x3<<20)|(0x3<<22));
    LPC_PINCON->PINSEL3 |= ((0x3<<20)|(0x3<<22));
    #endif
    LPC_TIM0->IR = 0x0F;
    pclkdiv = (LPC_SC->PCLKSEL0 >> 2) & 0x03;
    switch ( pclkdiv )
    { case 0x00:
    default:
    pclk = SystemFrequency/4;
    break;
    case 0x01:
    pclk = SystemFrequency;
    break;
    case 0x02:
    pclk = SystemFrequency/2;
    break;
    case 0x03:
    pclk = SystemFrequency/8;
    break;
    } LPC_TIM0->PR = pclk/1000000; /* set prescaler to get 1 M counts/sec */
    LPC_TIM0->MR0 = TIME_INTERVALmS * 15; /* Set up 15 mS interval */
    #if TIMER_MATCH
    LPC_TIM0->EMR &= ~(0xFF<<4);
    LPC_TIM0->EMR |= ((0x3<<4)|(0x3<<6));
    #else
    /* Capture 0 and 1 on rising edge, interrupt enable. */
    LPC_TIM0->CCR = (0x1<<0)|(0x1<<2)|(0x1<<3)|(0x1<<5);
    #endif
    LPC_TIM0->MCR = (0x3<<0); //|(0x3<<3); /* Interrupt and Reset on MR0 and MR1 */
    NVIC_EnableIRQ(TIMER0_IRQn);
    return (TRUE);
    }

    Please help me where i done mistake...

    Thank You.

Reply
  • 0 in reply to Ash J

    Oki sir. I ,ll check it out. Anyway i ll show my code.

    void TIMER0_IRQHandler (void)
    { if ( LPC_TIM0->IR & (0x1<<0) )
    { LPC_TIM0->IR = 0x1<<0;
    timer0_m0_counter++;
    if ( ( LPC_TIM0->TCR == TIME_INTERVALmS * 15) )
    { reset_timer( 0 );
    enable_timer (0);
    LPC_TIM0->MR0 = TIME_INTERVALmS * 1;
    LPC_GPIO0->FIOSET|=(1<<21);
    LPC_GPIO1->FIOSET = 1<<29;
    } if (LPC_TIM0->TC == TIME_INTERVALmS * 1 )
    { reset_timer( 0 );
    enable_timer (0);
    LPC_GPIO0->FIOCLR|=(1<<21);
    LPC_GPIO1->FIOCLR = 1<<29;
    LPC_TIM0->MR0 = TIME_INTERVALmS * 15;
    } }
    if ( LPC_TIM0->IR & (0x1<<1) )
    { LPC_TIM0->IR = 0x1<<1;
    timer0_m1_counter++;
    } if ( LPC_TIM0->IR & (0x1<<4) )
    { LPC_TIM0->IR = 0x1<<4;
    timer0_capture0++;
    } if ( LPC_TIM0->IR & (0x1<<5) )
    { LPC_TIM0->IR = 0x1<<5;
    timer0_capture1++;
    } return;
    }

    uint32_t init_timer ( uint8_t timer_num, uint32_t TimerInterval )
    { uint32_t pclkdiv, pclk;
    if ( timer_num == 0 )
    { timer0_m0_counter = 0;
    timer0_m1_counter = 0;
    timer0_capture0 = 0;
    timer0_capture1 = 0;
    LPC_SC->PCONP |= (0x01<<1);
    #if TIMER_MATCH
    LPC_PINCON->PINSEL3 &= ~((0x3<<24)|(0x3<<26));
    LPC_PINCON->PINSEL3 |= ((0x3<<24)|(0x3<<26));
    #else
    LPC_PINCON->PINSEL3 &= ~((0x3<<20)|(0x3<<22));
    LPC_PINCON->PINSEL3 |= ((0x3<<20)|(0x3<<22));
    #endif
    LPC_TIM0->IR = 0x0F;
    pclkdiv = (LPC_SC->PCLKSEL0 >> 2) & 0x03;
    switch ( pclkdiv )
    { case 0x00:
    default:
    pclk = SystemFrequency/4;
    break;
    case 0x01:
    pclk = SystemFrequency;
    break;
    case 0x02:
    pclk = SystemFrequency/2;
    break;
    case 0x03:
    pclk = SystemFrequency/8;
    break;
    } LPC_TIM0->PR = pclk/1000000; /* set prescaler to get 1 M counts/sec */
    LPC_TIM0->MR0 = TIME_INTERVALmS * 15; /* Set up 15 mS interval */
    #if TIMER_MATCH
    LPC_TIM0->EMR &= ~(0xFF<<4);
    LPC_TIM0->EMR |= ((0x3<<4)|(0x3<<6));
    #else
    /* Capture 0 and 1 on rising edge, interrupt enable. */
    LPC_TIM0->CCR = (0x1<<0)|(0x1<<2)|(0x1<<3)|(0x1<<5);
    #endif
    LPC_TIM0->MCR = (0x3<<0); //|(0x3<<3); /* Interrupt and Reset on MR0 and MR1 */
    NVIC_EnableIRQ(TIMER0_IRQn);
    return (TRUE);
    }

    Please help me where i done mistake...

    Thank You.

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