中文 :
功能說明 : 設計Z偵測到脈波輸入時，觸發中斷，清除AB向脈波計數值。
問題描述 :
QEI - 當AB相沒有收到任何輸入脈波時，INCNT無法計數。
當AB相有偵測到輸入脈波時，INCNT才會計數。
這現象會導致，編碼器AB 輸入停止時，無法成功清除AB相計數值。
有其他方法可以讓Z 計數獨立計算，不受INGATE(index gating configuration) 影響嗎?
English :
My Function : when Z detect pulse , interrtup will clear AB count value.
Problem :
QEI - when AB encoder no input pulse, INCNT can not count.
when AB encoder detect input pulse, INCANT can count.
lead to " when AB encoder stop, it can not clear AB count value."
have other way? let Z count indepdently. INGATE ( index gating configuration) can not work.
以下是我QEI 設定
--------------------------------
static void Setup_QEI(void)
{
/* Enable the clock to the Switch Matrix */
Chip_Clock_EnablePeriphClock (SYSCTL_CLOCK_QEI);
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SWM);
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 27, (IOCON_MODE_PULLDOWN | IOCON_FUNC1));
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 28, (IOCON_MODE_PULLDOWN | IOCON_FUNC1));
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 29, (IOCON_MODE_PULLDOWN | IOCON_FUNC1));
Chip_SWM_MovablePinAssign(SWM_QEI0_PHA_I, 27);
Chip_SWM_MovablePinAssign(SWM_QEI0_PHB_I, 28);
Chip_SWM_MovablePinAssign(SWM_QEI0_IDX_I, 29);
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_SWM);
/* QEI Control register reset */
LPC_QEI->CON = 15;
LPC_QEI->CLR = 0xFFFFFFFF;
/* Set QEI signal mode = AB */
LPC_QEI->CONF &= ~(1 << ((uint32_t)1));
/* Set QEI capture mode 2XAB */
LPC_QEI->CONF &= ~(1 << ((uint32_t)2));
/* PLCK = 72M, Edges = 2, Load = 72M */
/* 72M = 1000 ms, 1 ms = 72000 */
LPC_QEI->LOAD = (uint32_t) EnCoderPeriod * 72000;
LPC_QEI->MAXPOS = 0xFFFFFFFF;
/* Enable the interrupt for the QEI */
/* SCT/QEI(0) > MRT(6) > Can(7), Priotity 0~7, 0 is the highest */
NVIC_EnableIRQ (QEI_IRQn);
NVIC_SetPriority(QEI_IRQn, 0);
/* QEI Interrupt Enable Clear register, claer all interrupt enable */
LPC_QEI->IEC = 0xFFFFFFFF;
/* QEI Interrupt Enable Set register for INX_EN(BIT0)*/
LPC_QEI->IES = ((uint32_t)(1 << 0));
}
void QEI_IRQHandler(void)
{
/* Check QEI interrupt status (Bit 0) for INX_EN(Z) */
if(LPC_QEI->INTSTAT & ((uint32_t)(1 << 0)))
{
/* When index pulse(Z) was detedtd, clear Encoder pulse */
/* QEI Control register reset */
LPC_QEI->CON = 15;
/* QEI Interrupt Status clear (Bit 15) for INX_EN(Z) */
LPC_QEI->CLR = ((uint32_t)(1 << 0));
}
}
