【正文】 SPLCNT：采樣計(jì)數(shù)選擇位，設(shè)置范圍是 0－ 15， 0和 1都將被認(rèn)為是一次。當(dāng)然位置改變會(huì)產(chǎn)生一個(gè)位置改變的中斷，如果此中斷使能的情 況下，對捕獲到的數(shù)值就可以在位置改變中斷時(shí)做出相應(yīng)的處理。使能時(shí)，對這些引腳上的輸入信號進(jìn)行采樣，將結(jié)果鎖存入 POS_DectData 寄存器的 PDR [2:0]位中，一旦禁止該功能， PDR [2:0]中仍保持了先前的狀態(tài)。外部位置信號必須連續(xù)的以與采樣計(jì)數(shù)的設(shè)置相匹配的數(shù)值采樣，這樣才算作有效的位置信號。 // 上升沿計(jì)數(shù) P_TMR0_Ctrl = 3。這里的設(shè)置將決定速度測量的精度和范圍。清除源的設(shè)置將影響 BLDC 的電角度向機(jī)械角度的換算和 BLDC 轉(zhuǎn)速測量的精度。分別是每六次外文翻譯（譯文） 24 P_POSx_DectData(x = 0, 1)變化清除一次 TCNT、每三次 P_POSx_DectData(x = 0, 1)變化清除一次 TCNT 和每一次 P_POSx_DectData(x = 0, 1)變化清除一次 TCNT，也可以說成 BLDC 每轉(zhuǎn)過 360176。輸入捕獲和一般意義上的還有所不同，因?yàn)槲覀冇?PDC 位置改變中斷來捕獲在兩次位置改變過程中所經(jīng)歷的時(shí)間，這個(gè) 時(shí)間是以一定頻率脈沖做為時(shí)鐘源來計(jì)數(shù)得到的，所以要對相關(guān)計(jì)數(shù)的事項(xiàng)來進(jìn)行設(shè)置。若選擇 FCK/1為計(jì)數(shù)時(shí)鐘，如果為雙沿觸發(fā)，那么計(jì)數(shù)器將以上升沿方式工作。 0000 ＝ 標(biāo)準(zhǔn)模式 (連續(xù)遞增計(jì)數(shù) ) 0100 ＝ 相位計(jì)數(shù)模式 1 0101 ＝ 相位計(jì)數(shù)模式 2 0110 ＝ 相位計(jì)數(shù)模式 3 0111 ＝ 相位計(jì)數(shù)模式 4 1x0x ＝ 邊沿 PWM模式 (連續(xù)遞增計(jì)數(shù)， PWM輸出 ) 1x1x ＝ 中心沿 PWM模式 (連續(xù)遞增 /遞減計(jì)數(shù)， PWM輸出 ) 第 9:8 位 CLEGS：計(jì)數(shù)器清除邊沿選擇位，用于輸入捕獲模式下選擇計(jì)數(shù)器清除邊沿。 在測速中我們可能要用到的寄存器有：定時(shí)器 0/1控制寄存器 P_TMRx_Ctrl(x = 0, 1)、定時(shí)器 0/1 位置偵測控制寄存器 P_POSx_DectCtrl(x = 0, 1)、定時(shí)器 0/1輸入 /輸出控制寄存器 P_TMRx_IOCtrl(x = 0, 1)、定時(shí)器 0/1 中斷使能寄存器P_TMRx_INT(x = 0, 1)。而直流無刷電機(jī)即是依據(jù)位置信 息來改變電流相位。 //Send data to DMC } } Main Process Description The main program performs system initialization and DMC data detection. While the DMC data detection can also be performed in a timer interrupt with a certain frequency. Figure 31 shows the coding flow. Figure 31 Main Process ISR Description In PDC interrupt, system reads and filters the data, then calculates the motor speed. The coding flow is shown as Figure 32 . Start System Initialization 【 API： Spmc75_System_Init（）】 Start/stop mand detection 【 API： MC75_DMC_UART_Service（）】 外文翻譯（原文） 16 Figure 32 ISR Process Hardware This example is designed for the purpose of study and reference, so we simply need to input a position signal to test the system. The hardware connection is shown as Figure 33 . Figure 33 Test Hardware Connection Y Interrupt vector PDC ISR 【 API： Spmc75_PDCETSPD_ISR（）】 Rti PDC int ? N 外文翻譯（原文） 17 Where, the position signal can be generated by MCU or special timing logic circuit instead of necessarily being the real signal from BLDC (see Figure 34 and Figure 35 ). The frequency of position detection change can be adjusted by the potentiometer or ADC in MCU system Figure 34 Hall Signal Figure 34 shows the three position signals timing with the sequence of 010b, 011b, 001b, 101b, 100b, 110b. Figure 35 Hall signal Figure 35 shows Hall3, Hall2, Hall1 timing with the sequence of 110b, 100b, 101b, 001b, 011b, 010b. It is the same to test in real BLDC. The two timings present the different motor directions: move forward or move backward. The file in Appendix shows the code for simulating hall signal with SPMC75F2413A. We can use ADC0 voltage to simulate the speed variation, where IOD15, IOD14 and IOD13 are corresponding to Hall3, Hall2 and Hall1 respectively and IOA0/AN0 is used for ADC conversion to adjust the simulated speed. 外文翻譯（譯文） 19 用 SPMC75 的 PDC 定時(shí)器做 BLDC 電機(jī)的速度檢測 一、 BLDC 的速度測算 1 直流無刷電動(dòng)機(jī)概述 直流無刷電動(dòng)機(jī)采用電子換向器替代了傳統(tǒng)直流電動(dòng)機(jī)的機(jī)械換向裝置，從而 克服了電刷和換向器所引起的噪聲、火花、電磁干擾、壽命短等一系列弊病。 // Average the accumulation data original = (UInt16)(summation SHIFTDIV)。 original MAXRPM) { //Accumulate the captured data and perform moving filter summation = *ptr。 P_TMR0_Status, = 1。 } } Subfunction for speed measurement define TMRPSFCK (+6)/64 //Counter clock source define PAIRPOLE 2 //BLDC pole pairs define PDCCLEAR 1 //CNT clear source define SPDLIMIT 5000 //Define the highest motor speed to avoid the disturbance due to sharp pulse define RADIX (UInt32)((TMRPSFCK*60*PDCCLEAR) //(6*PAIRPOLE)) define MAXRPM (UInt16)(RADIX/SPDLIMIT) static UInt16 a Filter[CAPBSIZE]。amp。 3 Design Tips Demo Listing /*= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = */ // Example /*= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = */ 外文翻譯（原文） 13 include include include include main() { Spmc75_System_Init()。 // Sample Delay Speed Calculation In order to obtain the exact parameters, the data must be filtered after captured. There are many filter algorithms, such as lowpass filter, moving average filter, median filter, average filter, limiting filtering, firstorder filter, moving average filtering, etc. In general, the data can be considered valid after processed by these filters. Then the speed can be calculated by substituting these parameters data in the formula. Assume Fcap is PDC capture clock frequency。 // Count on FCK/32 P_POS0_DectCtrl, = 1。 // Normal Counting mode P_TMR0_Ctrl, = 6。 // TCNT cleared by P_POSx_DectData (x = 0, 1) // Each time position detection data change P_TMR0_Ctrl, = 0。 // Sample regularly P_POS0_DectCtrl, = 10。 p is the polepair of BLDC rotor。 //System initialization while(1) { MC75_DMC_UART_Service()。 P_TMR0_INT, ) { Spmc75_PDCETSPD_ISR()。 //Moving average filter data static UInt16 *ptr = a Filter。 // Clear interrupt flag original = P_TMR0_TGRA, W。 *ptr = original。 uiSpeed = (UInt32)RADIX/original。由于直流無刷電動(dòng)機(jī)既具備交流電動(dòng)機(jī)的結(jié)構(gòu)簡單、運(yùn)行可靠、維護(hù)方便等一系列優(yōu)點(diǎn)，又具有直流電動(dòng)機(jī)的運(yùn)行效率高、無勵(lì)磁損耗以及調(diào)速性能好等諸多優(yōu)點(diǎn)，故其在工業(yè)領(lǐng)域中的應(yīng)用越來越廣泛。如圖 11所示 PDC 定時(shí)器 0和定時(shí)器 1的整體框圖。這里將著重介紹 P_TMRx_Ctrl 寄存器和 P_POSx_DectCtrl寄存器的在測速方面使用時(shí)的設(shè)置。 00 ＝不清除 01 ＝上升沿 10 ＝下降沿 11 ＝ 雙沿 第 7:5 位 CCLS：計(jì)數(shù)器清除源選擇位，用于選擇 TCNT的計(jì)數(shù)清除源。 00 ＝ 上升沿計(jì)數(shù) 01 ＝ 下降沿計(jì)數(shù) 1X ＝ 雙沿計(jì)數(shù) 第 2:0 位 TMRPS：定時(shí)器分頻選擇位，用于選擇 TCNT計(jì)數(shù)時(shí)鐘源。 MODE： MODE 為定時(shí)器操作模式設(shè)置位，有七種模式可以設(shè)置，然而這里只能是設(shè)置為 0000＝標(biāo)準(zhǔn)模式（連