m16 time1 無法正確 1sec 跑一次 timer1_ovf_isr

學習進度: 1sec 霹靂燈(五顆LED來回閃爍 1~5~1)
實作目標: m16/內建1Mhz OSC/ timer1方式 1sec 跑一次 timer1_ovf_isr 點燈
問題未解: 以 ICC AVR 內建的 Applicate Builder 生成的 time1 無法正確 1sec 跑一次 timer1_ovf_isr
以下為實作源碼,請學長們指正.謝謝.
----------------------------------------------------------------------------
#include <iom16v.h>
#include <macros.h>
#include "delaytime.c"
#include "led.h"
#include "led.c"

unsigned int timer1_count=0 ;

void LED_Init(void)
{

   DDRA|=0XE0;
   PORTA&=0X1F;
   DDRC|=0X03;
   PORTC&=0XFC;
}
void key_Init(void)
{
   DDRC|=0XE0;
   DDRC&=0XE3;
   PORTC&=0X1F;
}

//TIMER1 initialize - prescale:256
// WGM: 0) Normal, TOP=0xFFFF
// desired value: 1Sec
// actual value:  1.000Sec (0.0%)
void timer1_init(void)
{
TCCR1B = 0x00; //stop
TCNT1H = 0xF0; //setup
TCNT1L = 0xBE;
OCR1AH = 0x0F;
OCR1AL = 0x42;
OCR1BH = 0x0F;
OCR1BL = 0x42;
//OCR1CH = $OCR1CH$;
//OCR1CL = $OCR1CL$;
ICR1H  = 0x0F;
ICR1L  = 0x42;
TCCR1A = 0x00;
TCCR1B = 0x04; //start Timer
}

void Gpio_Init(void)
{
       LED_Init();
   key_Init();
timer1_init();
}

#pragma interrupt_handler timer1_compa_isr:7
void timer1_compa_isr(void)
{
//compare occured TCNT1=OCR1A
}

#pragma interrupt_handler timer1_compb_isr:8
void timer1_compb_isr(void)
{
//compare occured TCNT1=OCR1B
}

#pragma interrupt_handler timer1_ovf_isr:9
void timer1_ovf_isr(void)                      // 燈號運作正常但時序不正確無法掌控...
{
//TIMER1 has overflowed
TCNT1H = 0xF0; //reload counter high value
TCNT1L = 0xBE; //reload counter low value
timer1_count++;
switch(timer1_count)
{
case 1:
{
        LED2_OFF;
LED1_ON;
} break;
case 2:
{
     LED1_OFF;
LED2_ON;
} break;
case 3:
{
        LED2_OFF;
LED3_ON;
} break;
case 4:
{
        LED3_OFF;
LED4_ON;
} break;
case 5:
{
        LED4_OFF;
LED5_ON;
} break;
case 6:
{
        LED5_OFF;
LED4_ON;
} break;
case 7:
{
        LED4_OFF;
LED3_ON;
} break;
case 8:
{
        LED3_OFF;
LED2_ON;
timer1_count=0;
} break;
}
}

void main(void)
{
CLI(); //disable all interrupts
   Gpio_Init();
   ALL_ON;
   delay_nms(500);
   ALL_OFF;
   delay_nms(500);

MCUCR = 0x00;
GICR  = 0x00;
TIMSK = 0x1C; //timer interrupt sources
SEI(); //re-enable interrupts
   while(1)
   {
      // led();
   }
}

jemmy0938

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沙发

发表于 2010-11-20 03:50 | 显示全部帖子

感謝各位學長們教導..@@
經過多方驗證後發現應該是MCU主頻錯誤導致頻率誤差.
這幾天一直誤認 PROGISP 中的 fuse 設定就是由片內讀取的設定 int 1Mhz.

經重新 fuse 設 int. 8Mhz+64ms 以 256 除頻 timer1 得出正確結果 1sec.
下列程式執行正確無誤...@@
-------------------------------------------------------------------------------------
void timer1_init(void)
{
TCCR1B = 0x00; //stop
TCNT1H = 0x85; //setup
TCNT1L = 0xEF;
OCR1AH = 0x7A;
OCR1AL = 0x11;
TCCR1A = 0x00;
TCCR1B = 0x0C; //start Timer
}

#pragma interrupt_handler timer1_compa_isr:7
void timer1_compa_isr(void)
{
timer1_count++;
}

void main(void)
{
CLI(); //disable all interrupts
   Gpio_Init();
   timer1_init();

   ALL_ON;
   delay_nms(200);
   ALL_OFF;
   delay_nms(200);

MCUCR = 0x00;
GICR  = 0x00;
TIMSK = 0x10;

SEI(); //re-enable interrupts
   while(1)
   {
switch(timer1_count)
{
case 1:
{
        LED2_OFF;
LED1_ON;
} break;
case 2:
{
     LED1_OFF;
LED2_ON;
} break;
case 3:
{
        LED2_OFF;
LED3_ON;
} break;
case 4:
{
        LED3_OFF;
LED4_ON;
} break;
case 5:
{
        LED4_OFF;
LED5_ON;
} break;
case 6:
{
        LED5_OFF;
LED4_ON;
} break;
case 7:
{
        LED4_OFF;
LED3_ON;
} break;
case 8:
{
        LED3_OFF;
LED2_ON;
timer1_count=0;
} break;
}
}
}

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3楼

发表于 2010-11-21 16:13 | 显示全部帖子

本帖最后由 jemmy0938 于 2010-11-21 16:23 编辑

請問各位學長們:
設定 PORTC=0X03/ DDRC=0X03 後,量第2,3,4 依然是5V.這樣有正確嗎?
目前正學 KEYPAD 用到 PORTC 2~7, 可是怎樣設2,3,4 電壓都是 5V.
各位學長們有這情況嗎?經設定 PORTC=0X03/ DDRC=0X03 測 PC2,3,4,5 為高.測 6,7 可受控.
設 PORTD=0x00 / DDRD =0x00 測 PD7 為高,其他都正常.
這現象是 mcu 故障了?

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jemmy0938

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4楼

发表于 2010-11-24 00:29 | 显示全部帖子

謝謝學長教導:再問一個情況作為總結.
中斷 T/C1 OVL + comp A+B 三種一起使用可以嗎?
1)OVL 方式功能一直都正常
2) COMP A/B 偶不正常,如:開機進 COMP A 第一次就停了.
3)兩天前一直用OVL+COMPA+COMPB,今天忽然又無法使用了,是否是編譯器的問題?
代碼如下,
----------------------------------------------------------------------------
void timer1_init(void)
{
TCCR1B = 0x00;
TCNT1H = 0x85;
TCNT1L = 0xEE;
OCR1AH = 0x01;
OCR1AL = 0x38;
OCR1BH = 0x01;
OCR1BL = 0x38;
TCCR1A = 0x00;
TCCR1B = 0x0C; //start Timer
}

void port_init(void)
{
PORTA = 0x00;
DDRA  = 0x00;
PORTB = 0x0F;
DDRB  = 0x00;
PORTC = 0x0F; //m103 output only
DDRC  = 0x00;
PORTD = 0x00;
DDRD  = 0x00;
}

#pragma interrupt_handler timer1_compa_isr:7
void timer1_compa_isr(void)
{
//compare occured TCNT1=OCR1A
keyVal = ((PINB&0x0F) ^0X0F);
}

#pragma interrupt_handler timer1_compb_isr:8
void timer1_compb_isr(void)
{
//compare occured TCNT1=OCR1B
timer1_count++;
}

#pragma interrupt_handler timer1_ovf_isr:9
void timer1_ovf_isr(void)
{
//TIMER1 has overflowed
TCNT1H = 0x85; //reload counter high value
TCNT1L = 0xEE; //reload counter low value
}

void main(void)
{
CLI(); //disable all interrupts
   port_init();
   timer1_init();
   ALL_ON;
   delay_nms(200);
   ALL_OFF;
   delay_nms(200);

MCUCR = 0x00;
GICR  = 0x00;
TIMSK = 0x1C;
SEI(); //re-enable interrupt
   while(1)
   {

switch(timer1_count)
{
case 1:
{
        LED2_OFF;
LED1_ON;
} break;
case 2:
{
     LED1_OFF;
LED2_ON;
} break;
case 3:
{
        LED2_OFF;
LED3_ON;
} break;
case 4:
{
        LED3_OFF;
LED4_ON;
} break;
case 5:
{
        LED4_OFF;
LED5_ON;
} break;
case 6:
{
        LED5_OFF;
LED4_ON;
} break;
case 7:
{
        LED4_OFF;
LED3_ON;
} break;
case 8:
{
        LED3_OFF;
LED2_ON;
timer1_count=0;
} break;
// case 6:
//    {
//          ALL_OFF;
//    timer1_count=0;
// } break;
}

}
}

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