CCU6测试频率与占空比

1. 根据待测波形频率与占空比计算波形的周期值,正频宽时间,负频宽时间.2. 选择合适的T12分频比,设置的分频比后时钟分辨率不能导致T12溢出.例如：80HZ的周期为12.5ms;T12溢出时间设置为25ms.触发上升沿中断，触发下降沿中断，再次触发上升沿中断。

假设设置分频比为fclk/8 = 0.333usec, 25,000/0.333 = 0x 1,24FF;超出T12计数范围.分频比选择不合适。

Fclk/16 = 0.667, 25,000/0.6667 = 0x927A;T12计数器未溢出满足要求。

3. T12的溢出时间设置为待测波形周期的2倍时间.4. 根据Dave工具配置工程.4.1 使能CCU模块 4.2 配置采样引脚 4.3 配置T12定时器 4.4 配置中断 4.5 配置采样模式4.6 配置函数双寄存器模式四：任意沿采样.CC6N任意沿将CC6nSR中的内容复制到CC6nR中,T12的实际计数值立即保存在映射寄存器CC6nSR 中。

第一种计算方法:// USER CODE BEGIN (NodeI0,1)unsigned int HighWidth,LowWidth;// USER CODE ENDvoid SHINT_viXINTR10Isr(void) interrupt XINTR10INT{// USER CODE BEGIN (NodeI0,2)unsigned int uiCapRiseL, uiCapFallL,uiCapRiseH, uiCapFallH;// USER CODE ENDSFR_PAGE(_su3, SST0); // switch to page 3// CCU6 Node 0 interrupt handling section...读映射寄存器CC6nSR函数读通道寄存器CC6nR函数if (IRCON3 & 0x01) // if CCU6SR0{IRCON3 &= ~(ubyte)0x01;// USER CODE BEGIN (NodeI0,3)// USER CODE ENDSFR_PAGE(_cc3, noSST); // switch to page 3if(CCU6_ISL & 0x01) //if ISL_ICC60R{//capture, compare match rising edge detection an channel 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);uiCapRiseH = CCU6_CC60SRLH;LowWidth = 0xFFFF + 1 + uiCapRiseH - uiCapFallH;// USER CODE END}SFR_PAGE(_cc3, noSST); // switch to page 3if(CCU6_ISL & 0x02) //if ISL_ICC60F{//capture, compare match faling edge detection an channel 0SFR_PAGE(_cc0, noSST); // switch to page 0CCU6_ISRL = 0x02; //clear flag IS_ICC60F// USER CODE BEGIN (NodeI0,11)SFR_PAGE(_cc1,SST0);uiCapRiseL = CCU6_CC60RLH;SFR_PAGE(_cc1,RST0);uiCapFallL = CCU6_CC60SRLH;HighWidth = 0xFFFF + 1 + uiCapFallL - uiCapRiseL;// USER CODE END}} // End of CCU6SR0 condition check// USER CODE BEGIN (NodeI0,5)// USER CODE ENDSFR_PAGE(_su3, RST0); // restore the old SCU page} // End of function SHINT_viXINTR10Isr红色字体标注部分为添加的代码段.typedef struct{float Freq;float Duty;}CCU6_INFO;extern unsigned int HighWidth,LowWidth;void main(void){// USER CODE BEGIN (MAIN_Main,2)CCU6_INFO stCCU6_Results;// USER CODE ENDMAIN_vInit();// USER CODE BEGIN (MAIN_Main,3)// USER CODE ENDwhile(1){// USER CODE BEGIN (MAIN_Main,4)stCCU6_Results.Duty = HighWidth * 1.0 / ( (ulong)HighWidth + LowWidth ); stCCU6_Results.Freq = 1000000.0/( ((ulong)HighWidth + LowWidth) *0.66667 ); PLC_D[1] = stCCU6_Results.Freq * 100;PLC_D[2] = stCCU6_Results.Duty * 1000;// USER CODE END}} // End of function main第二种计算方法:uword ubbuff[3] = {0};ubyte capture_ris = 0;// USER CODE ENDvoid SHINT_viXINTR10Isr(void) interrupt XINTR10INT{// USER CODE BEGIN (NodeI0,2)// USER CODE ENDSFR_PAGE(_su3, SST0); // switch to page 3// CCU6 Node 0 interrupt handling section...if (IRCON3 & 0x01) // if CCU6SR0{IRCON3 &= ~(ubyte)0x01;// USER CODE BEGIN (NodeI0,3)// USER CODE ENDSFR_PAGE(_cc3, noSST); // switch to page 3if(CCU6_ISL & 0x01) //if ISL_ICC60R{//capture, compare match rising edge detection an channel 0SFR_PAGE(_cc0, noSST); // switch to page 0CCU6_ISRL = 0x01; //clear flag ISL_ICC60R// USER CODE BEGIN (NodeI0,10)if (capture_ris == 0 ){ubbuff[0] = CC6_uwGetChannelShadowRegister_CC6_CHANNEL_0(); capture_ris = 1;}else if (capture_ris == 2){ubbuff[2] = CC6_uwGetChannelShadowRegister_CC6_CHANNEL_0(); capture_ris = 3;IEN1 &= ~0x10;}// USER CODE END}SFR_PAGE(_cc3, noSST); // switch to page 3if(CCU6_ISL & 0x02) //if ISL_ICC60F{//capture, compare match faling edge detection an channel 0SFR_PAGE(_cc0, noSST); // switch to page 0CCU6_ISRL = 0x02; //clear flag IS_ICC60F// USER CODE BEGIN (NodeI0,11)if (capture_ris == 1){ubbuff[1] =CC6_uwGetChannelShadowRegister_CC6_CHANNEL_0();capture_ris = 2;}// USER CODE END}} // End of CCU6SR0 condition check// USER CODE BEGIN (NodeI0,5)// USER CODE ENDSFR_PAGE(_su3, RST0); // restore the old SCU page} // End of function SHINT_viXINTR10Isrtypedef struct{uword Freq;float Duty;}CCU6_INFO;extern uword ubbuff[3];extern ubyte capture_ris;CCU6_INFO CCU6_Freq_Duty(uword *pBuf){uword CCU6_Pulse,CCU6_Cycle;CCU6_INFO stCCU6;CCU6_Pulse = (uword)(0xFFFF + pBuf[1] - pBuf[0] + 1); CCU6_Cycle =(uword)(0xFFFF + pBuf[2] - pBuf[0] + 1); stCCU6.Duty = CCU6_Pulse*1.0/CCU6_Cycle;stCCU6.Freq = 1000000.0/(CCU6_Cycle * 0.333); return (stCCU6);}void main(void){// USER CODE BEGIN (MAIN_Main,2)// USER CODE ENDMAIN_vInit();// USER CODE BEGIN (MAIN_Main,3)capture_ris = 0;// USER CODE ENDwhile(1){// USER CODE BEGIN (MAIN_Main,4)CCU6_INFO CCU6_Results;if (capture_ris == 3){CCU6_Results = CCU6_Freq_Duty(ubbuff);ubbuff[0] = 0;ubbuff[1] = 0;ubbuff[2] = 0;capture_ris = 0;IEN1 |= 0x10;}PLC_D[1] = CCU6_Results.Freq;PLC_D[2] = CCU6_Results.Duty*1000;// USER CODE END}} // End of function main。