CCU6測試頻率與占空比.doc

1、CCU6測試頻率與占空比.doc1根據(jù)待測波形頻率與占空比計算波形的周期值，正頻寬時間，負頻寬時間.2. 選擇合適的T12分頻比，設置的分頻比后時鐘分辨率不能導致T12溢出.例如：80HZ的周期為12.5ms;T12溢出時間設置為 25ms觸發(fā)上升沿中斷，觸發(fā)下降沿中斷，再次觸發(fā)上升沿中斷。假設設置分頻比為fclk/8 = 0.333usec, 25,000/0.333 = Ox 1,24FF;超出T12計數(shù)范圍分頻比選擇不 合適。Fclk/16 = 0.667, 25,000/0.6667 = 0x927A;T12 計數(shù)器未溢出滿足要求。3. T12的溢出時間設置為待測波形周期的2倍時間.4

2、. 根據(jù)Dave工具配置工程.4.1使能CCU模塊 4.2配置采樣引腳4.3配置T12定時器 4.4配置中斷 4.5配置采樣模式4.6配置函數(shù)雙寄存器模式四：任意沿采樣.CC6N任意沿將CC6nSR中的內(nèi)容復制到 CC6nR中,T12的實際計數(shù)值立即保存在映射寄存器CC6nSR中。第一種計算方法：/ USER CODE BEGIN (Nodel0,1)unsigned int HighWidth,LowWidth;/ USER CODE ENDvoid SHINT_viXINTR10Isr(void) in terrupt XINTR10INT/ USER CODE BEGIN (NodeI0

3、,2)un sig ned int uiCapRiseL, uiCapFallL,uiCapRiseH, uiCapFallH;/ USER CODE ENDSFR_PAGE(_su3, SST0); / switch to page 3/ CCU6 Node 0 interrupt handling section.讀映射寄存器CC6nSR函數(shù)讀通道寄存器CC6nR函數(shù)if (IRCON3 & 0x01) / if CCU6SR0IRCON3 &= (ubyte)0x01;/ USER CODE BEGIN (NodeI0,3)/ USER CODE ENDSFR_PAGE(_cc3, n

4、oSST); / switch to page 3if(CCU6_ISL & 0x01) /if ISL_ICC60R/capture, compare match rising edge detect ion an cha nnel 0SFR_PAGE(_cc0, noSST); / switch to page 0CCU6_ISRL = 0x01; /clear flag ISL_ICC60R/ USER CODE BEGIN (NodeI0,10)SFR_PAGE(_cc1,SST0);uiCapFallH = CCU6_CC60RLH;SFR_PAGE(_cc1,RST0);uiC a

5、pRiseH = CCU6_CC60SRLH;LowWidth = 0xFFFF + 1 + uiCapRiseH - uiCapFallH;/ USER CODE ENDSFR_PAGE(_cc3, n oSST); / switch to page 3if(CCU6_ISL & 0x02) /if ISL_ICC60F/capture, compare match fali ng edge detect ion an cha nnel 0SFR_PAGE(_ccO, noSST); / switch to page 0CCU6_ISRL = 0x02; /clear flag IS_ICC

6、60F/ USER CODE BEGIN (NodeI0,11)SFR_PAGE(_cc1,SST0);uiC apRiseL = CCU6_CC60RLH;SFR_PAGE(_cc1,RST0);uiC apFallL = CCU6_CC60SRLH;HighWidth = 0xFFFF + 1 + uiCapFallL - uiCapRiseL;/ USER CODE END / End of CCU6SR0 con dition check/ USER CODE BEGIN (Nodel0,5)/ USER CODE ENDSFR_PAGE(_su3, RST0); / restore

7、the old SCU page / End of fun ction SHINT_viXINTR10lsr紅色字體標注部分為添加的代碼段.typedef structfloat Freq;float Duty;CCU6_INFO;exter n un sig ned int HighWidth,LowWidth;void mai n(void)/ USER CODE BEGIN (MAIN_Mai n,2)CCU6_INFO stCCU6_Results;/ USER CODE ENDMAIN_vI nit();/ USER CODE BEGIN (MAIN_Mai n,3)/ USER C

8、ODE ENDwhile(1)/ USER CODE BEGIN (MAIN_Mai n,4)stCCU6_Results.Duty = HighWidth * 1.0 / ( (ulo ng)HighWidth + LowWidth ); stCCU6_Results.Freq = 1000000.0/( (ulo ng)HighWidth + LowWidth) *0.66667 ); PLC_D1 = stCCU6_Results.Freq * 100;PLC_D2 = stCCU6_Results.Duty * 1000;/ USER CODE END / End of fun cti

9、 on main第二種計算方法：uword ubbuff3 = 0;ubyte capture_ris = 0;/ USER CODE ENDvoid SHINT_viXINTR10Isr(void) in terrupt XINTR10INT/ USER CODE BEGIN (Nodel0,2)/ USER CODE ENDSFR_PAGE(_su3, SST0); / switch to page 3/ CCU6 Node 0 interrupt handling section.if (IRCON3 & 0x01) / if CCU6SR0IRCON3 &= (ubyte)0x01;/

10、 USER CODE BEGIN (NodeI0,3)/ USER CODE ENDSFR_PAGE(_cc3, n oSST); / switch to page 3if(CCU6_ISL & 0x01) /if ISL_ICC60R/capture, compare match rising edge detect ion an cha nnel 0SFR_PAGE(_cc0, noSST); / switch to page 0CCU6_ISRL = 0x01; /clear flag ISL_ICC60R/ USER CODE BEGIN (NodeI0,10)if (capture_

11、ris = 0 )ubbuff0 = CC6_uwGetCha nn elShadowRegister_CC6_CHANNEL_0(); capture_ris = 1;else if (capture_ris = 2)ubbuff2 = CC6_uwGetCha nn elShadowRegister_CC6_CHANNEL_0(); capture_ris = 3;IEN1 &= 0x10;/ USER CODE END SFR_PAGE(_cc3, n oSST); / switch to page 3 if(CCU6_ISL & 0x02) /if ISL_ICC60F/capture

12、, compare match fali ng edge detect ion an cha nnel 0SFR_PAGE(_cc0, noSST); / switch to page 0CCU6_ISRL = 0x02; /clear flag IS_ICC60F/ USER CODE BEGIN (NodeI0,11)if (capture_ris = 1)ubbuff1=CC6_uwGetCha nn elShadowRegister_CC6_CHANNEL_0(); capture_ris = 2;/ USER CODE END / End of CCU6SR0 condition c

13、heck/ USER CODE BEGIN (NodeI0,5)/ USER CODE ENDSFR_PAGE(_su3, RSTO); / restore the old SCU page / End of fun ction SHINT_viXINTR10lsr typedef structuword Freq;float Duty;CCU6_INFO;exter n uword ubbuff3;exter n ubyte capture_ris;CCU6_INFO CCU6_Freq_Duty(uword *pBuf)uword CCU6_Pulse,CCU6_Cycle;CCU6_IN

14、FO stCCU6;CCU6_Pulse = (uword)(0xFFFF + pBuf1 - pBuf0 + 1);CCU6_Cycle =(uword)(0xFFFF + pBuf2 - pBuf0 + 1); stCCU6.Duty = CCU6_Pulse*1.0/CCU6_Cycle;stCCU6.Freq = 1000000.0/(CCU6_Cycle * 0.333); return (stCCU6);void mai n(void)/ USER CODE BEGIN (MAIN_Mai n,2)/ USER CODE ENDMAIN_vI nit();/ USER CODE BEGIN (MAIN_Mai n,3) capture_ris = 0;/ USER CODE ENDwhile(1)/ USER CODE BEGIN (MAIN_Mai n,4)CCU6_INFO CCU6_Results;if