TI中文支持网例程倒数第二个语句：
// Note: To be safe, use a mask value to write to the entire
// EVAIFRB register. Writing to one bit will cause a read-modify-write
// operation that may have the result of writing 1's to clear // bits other then those intended. EvaRegs.EVAIFRB.all = BIT0;
说是为了保证系统安全工作，屏蔽定时器T2，‘
我的问题是为什么要屏蔽呢，屏蔽了不是不能中断了吗
Susan Yang：请您在提问时给出具体的例程，BLDC3-1的例程还是很多的。只给出一段代码，我也记不住是具体哪个例程
例程倒数第二个语句：
// Note: To be safe, use a mask value to write to the entire
// EVAIFRB register. Writing to one bit will cause a read-modify-write
// operation that may have the result of writing 1's to clear // bits other then those intended. EvaRegs.EVAIFRB.all = BIT0;
说是为了保证系统安全工作，屏蔽定时器T2，‘
我的问题是为什么要屏蔽呢，屏蔽了不是不能中断了吗
user6007383：
回复 Susan Yang:
// ***************** LEVEL3 *****************#if (BUILDLEVEL==LEVEL3)
// ——————————————————————————// Call the ADC04U_DRV read function.// —————————————————————————— adc1.read(&adc1);
// ——————————————————————————// Connect inputs of the RMP module and call the Ramp control// calculation function.// —————————————————————————— rc1.TargetValue = _IQ(SpeedRef); rc1.calc(&rc1);
// ——————————————————————————// Connect inputs of the HALL module and call the Hall sensor// read function.// —————————————————————————— hall1.HallMapPointer = (int16)mod1.Counter; hall1.read(&hall1);
// ——————————————————————————// Connect inputs of the MOD6 module and call the Modulo 6 counter// calculation function.// —————————————————————————— mod1.TrigInput =(int32)hall1.CmtnTrigHall; mod1.Counter = (int32)hall1.HallMapPointer; mod1.calc(&mod1);
// ——————————————————————————// Connect inputs of the RMP2 module and call the Ramp control 2// calculation function.// —————————————————————————— rmp2.DesiredInput = (int32)DFuncDesired; rmp2.calc(&rmp2);
// ——————————————————————————// Connect inputs of the PID_REG3 module and call the PID speed controller// calculation function.// —————————————————————————— pid1_spd.Ref = rc1.SetpointValue; pid1_spd.Fdb = speed1.Speed; pid1_spd.calc(&pid1_spd);
// ——————————————————————————// Set the speed closed loop flag once the speed is built up to a desired value. // —————————————————————————— if (rc1.EqualFlag == 0x7FFFFFFF) { SpeedLoopFlag = TRUE; rc1.RampDelayMax = 300; }
// ——————————————————————————// Connect inputs of the PWM_DRV module and call the PWM signal generation// update function.// —————————————————————————— // Switch from fixed duty-cycle or controlled Speed duty-cycle by SpeedLoopFlag variable if (SpeedLoopFlag == FALSE) pwm1.DutyFunc = (int16)rmp2.Out; // fixed duty-cycle else pwm1.DutyFunc = (int16)_IQtoIQ15(pid1_spd.Out); // controlled Speed duty-cycle
pwm1.CmtnPointer = (int16)mod1.Counter; pwm1.update(&pwm1);
// ——————————————————————————// Connect inputs of the SPEED_PR module and call the speed calculation // function.// —————————————————————————— if ((mod1.Counter == 5)&(hall1.CmtnTrigHall == 0x7FFF)) { speed1.TimeStamp = VirtualTimer; speed1.calc(speed1); }
// ——————————————————————————// Connect inputs of the DATALOG module // —————————————————————————— DlogCh1 = (int16)mod1.Counter; DlogCh2 = (int16)mod1.TrigInput; DlogCh3 = (int16)_IQtoIQ15(pid1_spd.Ref); DlogCh4 = (int16)_IQtoIQ15(pid1_spd.Fdb);
// ——————————————————————————// Connect inputs of the EN_DRV module and call the enable/disable PWM signal// update function (for DMC1500 only).// —————————————————————————— drv1.EnableFlag = EnableFlag; drv1.update(&drv1);
#endif // (BUILDLEVEL==LEVEL3)
// ——————————————————————————// Increase virtual timer and force 15 bit wrap around// —————————————————————————— VirtualTimer++; VirtualTimer &= 0x00007FFF;
// ——————————————————————————// Call the DATALOG update function.// —————————————————————————— dlog.update(&dlog);
#if (DSP_TARGET==F2808)// Acknowledge interrupt to recieve more interrupts from PIE group 1 PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;#endif
#if (DSP_TARGET==F2812)// Enable more interrupts from this timer EvaRegs.EVAIMRB.bit.T2PINT = 1; // Note: To be safe, use a mask value to write to the entire // EVAIFRB register. Writing to one bit will cause a read-modify-write // operation that may have the result of writing 1's to clear // bits other then those intended. EvaRegs.EVAIFRB.all = BIT0;*************************************就是这句******************************** // Acknowledge interrupt to recieve more interrupts from PIE group 3 PieCtrlRegs.PIEACK.all |= PIEACK_GROUP3;#endif}
您好，感谢您的回答，我有疑问的那句就在这段的倒数第6行
例程倒数第二个语句：
// Note: To be safe, use a mask value to write to the entire
// EVAIFRB register. Writing to one bit will cause a read-modify-write
// operation that may have the result of writing 1's to clear // bits other then those intended. EvaRegs.EVAIFRB.all = BIT0;
说是为了保证系统安全工作，屏蔽定时器T2，‘
我的问题是为什么要屏蔽呢，屏蔽了不是不能中断了吗
Susan Yang：
回复 user6007383:
您可以看一下TRM内的说明
Since EVxIFRx are readable registers, occurrence of an interrupt event can be monitored by software polling the appropriate bit in EVxIFRx when the interrupt is masked.
