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问 /*----------------------------------------------------------------
ARM水鸟 HotPower@126.com
2006.06.26 23:55 于西安大雁塔村队部
-----------------------------------------------------------------*/
void PwmObj::OpenPwm(unsigned int worknum)
{
worknum &= 3;
PWM-> PWM_PR = 0x00;
PWM-> PWM_MCR = (1 << PWMMCRR0);
switch (worknum) {
case 0://CD1
PINSEL->PIN_SEL0 |= (P0_7_ PWM2 << P0_7_PINSEL);// P0.7连接到 PWM2
PWM-> PWM_PCR |= (1 << PWMENA2);
PWM-> PWM_MR0 = PwmSize;//16KHz (周期数=864)
PWM-> PWM_MR2 = PwmStartSize;
PWM-> PWM_LER = (1 << PWMLER2) | (1 << PWMLER0);
break;
case 1://CD2
PINSEL->PIN_SEL0 |= (P0_8_ PWM4 << P0_8_PINSEL);// P0.8连接到 PWM4
PWM-> PWM_PCR |= (1 << PWMENA4);
PWM-> PWM_MR0 = PwmSize;//16KHz (周期数=864)
PWM-> PWM_MR4 = PwmStartSize;
PWM-> PWM_LER = (1 << PWMLER4) | (1 << PWMLER0);
break;
case 2://CD3
PINSEL->PIN_SEL0 |= (P0_9_ PWM6 << P0_9_PINSEL);// P0.9连接到 PWM6
PWM-> PWM_PCR |= (1 << PWMENA6);
PWM-> PWM_MR0 = PwmSize;//16KHz (周期数=864)
PWM-> PWM_MR6 = PwmStartSize;
PWM-> PWM_LER = (1 << PWMLER6) | (1 << PWMLER0);
break;
case 3://CD4
PINSEL->PIN_SEL1 |= (P0_21_ PWM5 << P0_21_PINSEL);// P0.21连接到 PWM5
PWM-> PWM_PCR |= (1 << PWMENA5);
PWM-> PWM_MR0 = PwmSize;//16KHz (周期数=864)
PWM-> PWM_MR5 = PwmStartSize;
PWM-> PWM_LER = (1 << PWMLER5) | (1 << PWMLER0);
break;
}
PWM-> PWM_TCR = 0x02;
PWM-> PWM_TCR = 0x09;
}

void PwmObj::ClosePwm(unsigned int worknum)
{
worknum &= 3;
switch (worknum) {
case 0:
PWM-> PWM_MR2 = 0;// PWM2
CDPORT->IOCLR = (1 << P0_7);
CDPORT->IODIR |= (1 << P0_7);
PINSEL->PIN_SEL0 &= ~(3 << P0_7_PINSEL);// P0.7连接到GPIO
break;
case 1:
PWM-> PWM_MR4 = 0;// PWM4
CDPORT->IOCLR = (1 << P0_8);
CDPORT->IODIR |= (1 << P0_8);
PINSEL->PIN_SEL0 &= ~(3 << P0_8_PINSEL);// P0.8连接到GPIO
break;
case 2:
PWM-> PWM_MR6 = 0;// PWM6
CDPORT->IOCLR = (1 << P0_9);
CDPORT->IODIR |= (1 << P0_9);
PINSEL->PIN_SEL0 &= ~(3 << P0_9_PINSEL);// P0.9连接到GPIO
break;
case 3:
PWM-> PWM_MR5 = 0;// PWM5
CDPORT->IOCLR = (1 << P0_21);
CDPORT->IODIR |= (1 << P0_21);
PINSEL->PIN_SEL1 &= ~(3 << P0_21_PINSEL);// P0.21连接到GPIO
break;
}
}

void PwmObj::IncPwm(unsigned int worknum)
{
worknum &= 3;
switch(worknum) {
case 0:
if (( PWM-> PWM_MR2 + 1) < ( PWM-> PWM_MR0 * 70 / 100)) {
PWM-> PWM_MR2 += 1;
PWM-> PWM_LER = (1 << PWMLER2) | (1 << PWMLER0);
}
break;
case 1:
if (( PWM-> PWM_MR4 + 1) < ( PWM-> PWM_MR0 * 70 / 100)) {
PWM-> PWM_MR4 += 1;
PWM-> PWM_LER = (1 << PWMLER4) | (1 << PWMLER0);
}
break;
case 2:
if (( PWM-> PWM_MR6 + 1) < ( PWM-> PWM_MR0 * 70 / 100)) {
PWM-> PWM_MR6 += 1;
PWM-> PWM_LER = (1 << PWMLER6) | (1 << PWMLER0);
}
break;
case 3:
if (( PWM-> PWM_MR5 + 1) < ( PWM-> PWM_MR0 * 70 / 100)) {
PWM-> PWM_MR5 += 1;
PWM-> PWM_LER = (1 << PWMLER5) | (1 << PWMLER0);
}
break;
}
}

void PwmObj::DecPwm(unsigned int worknum)
{
worknum &= 3;
switch(worknum) {
case 0:
if ( PWM-> PWM_MR2 >= 1) {
PWM-> PWM_MR2 -= 1;
PWM-> PWM_LER = (1 << PWMLER2) | (1 << PWMLER0);
}
break;
case 1:
if ( PWM-> PWM_MR4 >= 1) {
PWM-> PWM_MR4 -= 1;
PWM-> PWM_LER = (1 << PWMLER4) | (1 << PWMLER0);
}
break;
case 2:
if ( PWM-> PWM_MR6 >= 1) {
PWM-> PWM_MR6 -= 1;
PWM-> PWM_LER = (1 << PWMLER6) | (1 << PWMLER0);
}
break;
case 3:
if ( PWM-> PWM_MR5 >= 1) {
PWM-> PWM_MR5 -= 1;
PWM-> PWM_LER = (1 << PWMLER5) | (1 << PWMLER0);
}
break;
}
}

答 1: 好大哥，让弟弟见识了。支持 答 2: 有没有C的代码啊？？？？ 答 3: 能说一说其实现什么功能吗？？？？它的方波频率是多少？

它的四路输出的频率是一样的吗？？？

你是怎么实现脉冲输出个数的计数的？？