omapl138 ecap问题

vtinf · 发表于 2016-8-9 13:37:23

您好， tl-notify-ecap-test.zip 中 void ECAPIsr(void* param)程序中：  value = value / 156; 其中156是怎么确定的？

void ECAPIsr(void* param)
{
unsigned int intFlag;
int valueUpdated = 0;

intFlag = ECAPIntStatus(SOC_ECAP_REGS, ECAP_CNTOVF_INT
                                       | ECAP_CEVT1_INT
                                       | ECAP_CEVT2_INT
                                       | ECAP_CEVT3_INT
                                       | ECAP_CEVT4_INT);

ECAPIntStatusClear(SOC_ECAP_REGS, intFlag);
//IntEventClear(SYS_INT_ECAP_CHANNEL);

if(intFlag & ECAP_CEVT1_INT)
{
//       value = ECAPTimeStampRead(SOC_ECAP_REGS, ECAP_CAPTURE_EVENT_1);
//       valueUpdated = 1;
}
if(intFlag & ECAP_CEVT2_INT)
{
      value = ECAPTimeStampRead(SOC_ECAP_REGS, ECAP_CAPTURE_EVENT_2);
      valueUpdated = 1;
}
if(intFlag & ECAP_CEVT3_INT)
{
//       value = ECAPTimeStampRead(SOC_ECAP_REGS, ECAP_CAPTURE_EVENT_3);
//       valueUpdated = 1;
}
if(intFlag & ECAP_CEVT4_INT)
{
      value = ECAPTimeStampRead(SOC_ECAP_REGS, ECAP_CAPTURE_EVENT_4);
      valueUpdated = 1;
}
if(intFlag & ECAP_CNTOVF_INT)
{
      ECAPCounterConfig(SOC_ECAP_REGS, 0xffffffff - 228000000);
}
ECAPIntStatusClear(SOC_ECAP_REGS, ECAP_GLOBAL_INT);

if (valueUpdated)
      value = value / 156;
}