Kinetis Microcontrollers中的主题 Re: Comparator Frequency detection mode

Comparator Frequency detection mode

jagadeeshsurnen — Sat, 17 Feb 2018 07:46:52 GMT

we are having issues with frequency measurement. we saw DAC disabled in the comments but in the defination structure we noticed that DACEN bit is SET which is enabled.can you help me out in setting comparator frequency detection.
/**************************************************************************/ /*!
* @brief Comparator Frequency Detection Setting:
* - filter disabled,
* - hysteresis 5mv,
* - sample, windowing and trigger modes disabled,
* - high speed mode,
* - non-inverting polarity,
* - unfiltered signal propagated to output (disabled),
* - comparator enabled,
* - CMP filter disabled when CR1[SE]=0,
* - IRQ and DMA disabled,
* - DAC disabled.
*****************************************************************************/
#define CMP_FREQ_DETECT_MODE_CONFIG_EN_DAC(dac) \
(tCMP){ \
/* CR0 */ SET(CMP_CR0_FILTER_CNT(0)) |SET(CMP_CR0_HYSTCTR(3)), \
/* CR1 */ CLR(CMP_CR1_SE_MASK) |CLR(CMP_CR1_WE_MASK)| \
CLR(CMP_CR1_TRIGM_MASK) |SET(CMP_CR1_PMODE_MASK)| \
CLR(CMP_CR1_INV_MASK) |CLR(CMP_CR1_COS_MASK)| \
CLR(CMP_CR1_OPE_MASK) |SET(CMP_CR1_EN_MASK), \
/* FPR */ SET(CMP_FPR_FILT_PER(0x00)), \
/* SCR */ CLR(CMP_SCR_DMAEN_MASK) |CLR(CMP_SCR_IER_MASK)| \
CLR(CMP_SCR_IEF_MASK), \
/* DACCR */ SET(CMP_DACCR_DACEN_MASK) |CLR(CMP_DACCR_VRSEL_MASK)| dac \
}

Regards,

jagadeesh

Re: Comparator Frequency detection mode

Robin_Shen — Mon, 26 Feb 2018 09:30:43 GMT

Would you please tell us where can I get that example code?
So that I can help you check the problem easier.

If you need the DAC output as one of Reference Input, then you should enable this bit.

Best Regards

Robin

Re: Comparator Frequency detection mode

jagadeeshsurnen — Tue, 27 Feb 2018 12:44:59 GMT

Hi robin,

i took the reference from

https://www.nxp.com/webapp/Download?colCode=KMSWDRVAPIRM_SW .

Regards,

jagadeesh

Re: Comparator Frequency detection mode

Robin_Shen — Wed, 28 Feb 2018 07:32:59 GMT

I didn't find CMP_FREQ_DETECT_MODE_CONFIG_EN_DAC in cmp_test example(C:\Freescale\KM128SWDRV_R4_1_6\build\iar_7_40\projects\cmp_test)

Only find Comparator Frequency Detection Setting in DRM143SW(Kinetis M One-phase power meter Design Reference Manual )
Have you refer that example?

Best Regards

Robin

Re: Comparator Frequency detection mode

jagadeeshsurnen — Sat, 03 Mar 2018 06:48:27 GMT

hi robin,

yes, i have referred that example.

Best Regards,

jagadeesh

Re: Comparator Frequency detection mode

jagadeeshsurnen — Tue, 20 Mar 2018 06:52:29 GMT

hi robin ,

thanks for your help, got the frequency measurement. there was a problem with V2REF.

BR,

jagadeesh