Нужно оптимизировать код, Есть идеи как? Опции

[skyled]

Есть такой кусок кода:

Код

if((pwm>pgm_read_byte(&brightness[pwm_ch[0]]))|(pwm==0)){pd &= ~(1<<0);}//1
        else {pd |= (1<<0);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[1]]))|(pwm==0)){pd &= ~(1<<1);}//2    
        else {pd |= (1<<1);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[2]]))|(pwm==0)){pa &= ~(1<<1);}//3
        else {pa |= (1<<1);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[3]]))|(pwm==0)){pa &= ~(1<<0);}//4
        else {pa |= (1<<0);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[4]]))|(pwm==0)){pd &= ~(1<<2);}//5
        else {pd |= (1<<2);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[5]]))|(pwm==0)){pd &= ~(1<<3);}//6
        else {pd |= (1<<3);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[6]]))|(pwm==0)){pd &= ~(1<<4);}//7
        else {pd |= (1<<4);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[7]]))|(pwm==0)){pd &= ~(1<<5);}//8
        else {pd |= (1<<5);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[8]]))|(pwm==0)){pb &= ~(1<<4);}//9
        else {pb |= (1<<4);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[9]]))|(pwm==0)){pb &= ~(1<<3);}//10
        else {pb |= (1<<3);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[10]]))|(pwm==0)){pb &= ~(1<<2);}//11
        else {pb |= (1<<2);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[11]]))|(pwm==0)){pb &= ~(1<<1);}//12
        else {pb |= (1<<1);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[12]]))|(pwm==0)){pb &= ~(1<<0);}//13
        else {pb |= (1<<0);}
        if((pwm>pgm_read_byte(&brightness[pwm_ch[13]]))|(pwm==0)){pd &= ~(1<<6);}//14
        else {pd |= (1<<6);}

Он обрабатывается за 345 тактов. Мне нужно менее 300. Это возможно? А можно это как-то оформить ассемблерной вставкой? Спасибо.

[pokos]

У меня на 3 канала было вот так сделано:

Код

// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
// Reinitialize Timer 0 value
TCNT0=256-39+4;
//PWM-----------------------
pwr_cnt++;
if (red_a>pwr_cnt)
    { PORTD.7=1;}
else
    {PORTD.7=0;};
    
if (green_a>pwr_cnt)
    {PORTD.6=1;}
else
    {PORTD.6=0;};
    
if (blue_a>pwr_cnt)
    {PORTD.5=1;}
else
    {PORTD.5=0;};
}

Оттранслировалось в:
_timer0_ovf_isr:
    RCALL __SAVEISR
;      49 // Reinitialize Timer 0 value
;      50 TCNT0=256-39+4;
    LDI  R30,LOW(221)
    OUT  0x32,R30
;      51 //PWM-----------------------
;      52 pwr_cnt++;
    LDS  R30,_pwr_cnt
    SUBI R30,-LOW(1)
    STS  _pwr_cnt,R30
;      53 if (red_a>pwr_cnt) {PORTD.7=1;}
    LDS  R26,_red_a
    CP   R30,R26
    BRSH _0x2B
    SBI  0x12,7
;      54 else {PORTD.7=0;};
    RJMP _0x2C
_0x2B:
    CBI  0x12,7
_0x2C:
;      55 if (green_a>pwr_cnt) {PORTD.6=1;}
    LDS  R30,_pwr_cnt
    LDS  R26,_green_a
    CP   R30,R26
    BRSH _0x2D
    SBI  0x12,6
;      56 else {PORTD.6=0;};
    RJMP _0x2E
_0x2D:
    CBI  0x12,6
_0x2E:
;      57 if (blue_a>pwr_cnt) {PORTD.5=1;}
    LDS  R30,_pwr_cnt
    LDS  R26,_blue_a
    CP   R30,R26
    BRSH _0x2F
    SBI  0x12,5
;      58 else {PORTD.5=0;};
    RJMP _0x30
_0x2F:
    CBI  0x12,5
_0x30:
;      59 }
    RCALL __LOADISR
    RETI

Сообщение отредактировал pokos - Jan 24 2011, 15:21

[_Bill]

У меня на 3 канала было вот так сделано:

Код

// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
// Reinitialize Timer 0 value
TCNT0=256-39+4;
//PWM-----------------------
pwr_cnt++;
if (red_a>pwr_cnt)
    { PORTD.7=1;}
else
    {PORTD.7=0;};
    
if (green_a>pwr_cnt)
    {PORTD.6=1;}
else
    {PORTD.6=0;};
    
if (blue_a>pwr_cnt)
    {PORTD.5=1;}
else
    {PORTD.5=0;};
}

Попробуйте так

Код

// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
char _tmp;
// Reinitialize Timer 0 value
TCNT0=256-39+4;
//PWM-----------------------
_tmp = ++pwr_cnt;
if (red_a > _tmp)
    { PORTD.7=1;}
else
    {PORTD.7=0;};
    
if (green_a > _tmp)
    {PORTD.6=1;}
else
    {PORTD.6=0;};
    
if (blue_a > _tmp)
    {PORTD.5=1;}
else
    {PORTD.5=0;};
}