topic How to configure HVI0 function in MC9s12vr64? in S12 / MagniV Microcontrollers

How to configure HVI0 function in MC9s12vr64?

kernwang — Tue, 05 Jul 2016 14:49:26 GMT

After i configure the HVI0 function as following code, i can not get the right result from ATD result register ATDDR0.

Please help to finger out mistakes in my code. Thanks very much!

Of course , if you can give some suggestion, that will be best.

PTL init:

//********PTL INIT *********

DIENL |= 0x02U; //PTIL0 is set to analog input

//& PTIL1 are set to Digital Input for Down Switch(PTIIL1)

//PTIL2 & PTIL3 are reserved ;

PTAL = 0x08U;

PIRL = 0x03U;

PPSL = 0x00U; // Falling edge selected for Active interrupt edge

PIEL = 0x00U; // Interrupt is disabled; PIFL is interrupt flag

//*************************************

ATD init:

/* PIRL: PIRL3=0,PIRL2=0,PIRL1=0,PIRL0=1 */

PIRL = 0x01U;

/* Initialization of the ADC module */

/* ATDCTL0: WRAP3=1,WRAP2=1,WRAP1=1,WRAP0=1 */

ATDCTL0 = 0x0FU;

/* ATDCTL1: ETRIGSEL=0,SRES1=0,SRES0=1,SMP_DIS=0,ETRIGCH3=1,ETRIGCH2=1,ETRIGCH1=1,ETRIGCH0=1 */

ATDCTL1 = 0x2FU;

/* ATDCTL3: DJM=0,S8C=0,S4C=0,S2C=1,S1C=0,FIFO=0,FRZ1=0,FRZ0=0 */

ATDCTL3 = 0x90U;

/* ATDCTL4: SMP2=0,SMP1=0,SMP0=0,PRS4=0,PRS3=0,PRS2=1,PRS1=0,PRS0=1 */

ATDCTL4 = 0x05U;

/* ATDCTL5: SC=0,SCAN=0,MULT=0,CD=0,CC=0,CB=0,CA=0 */

ATDCTL5 = 0x00U;

/* ATDCTL2: AFFC=0,ETRIGLE=0,ETRIGP=0,ETRIGE=0,ASCIE=0,ACMPIE=0 */

ATDCTL2 = 0x00U;

Test codes in main.c:

ATDCTL5 = 0x8bU;

i look the result register _ATDDR0_Word in data1 windows of IDE.

It is always feedback result around 500;

Thanks very much!

Re: How to configure HVI0 function in MC9s12vr64?

RadekS — Fri, 08 Jul 2016 16:54:46 GMT

Hi Juejie,

Unfortunately, you didn’t specify some important details – like which voltage you applied to the HVI0 pin or bus clock.

You selected ATDCTL4_PRS=5. In that case, bus clock will be divided by 12. Therefore I suppose that your bus clock is 24 or 25MHz. Correct?

I do not understood your command ATDCTL5 = 0x8bU;.

The highest bit is reserved. I suppose that you want to set SC bit - Special Channel Conversion Bit.

In that case, you probably measure AN5 channel instead HVI0 pin. The command should be ATDCTL5 = 0x4BU;

BTW: you selected the sequence length value (S8C, S4C, S2C, S1C) = 2. It means that you should get two results in ATDDR0 and ATDDR1 registers.

BTW: you selected RatioL_HVI =2 in your configuration. In that case, the maximum voltage at pin must be below 10V.

I hope it helps you.

Have a great day,
Radek

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Re: How to configure HVI0 function in MC9s12vr64?

iggi — Tue, 12 Jul 2016 13:10:26 GMT

Hi Juejie,

Here is the example SW for your purpose. Also attached is another one demonstrating wake up from Stop mode with HVI.

Hope it helps.

iggi

Re: How to configure HVI0 function in MC9s12vr64?

kernwang — Thu, 14 Jul 2016 08:29:27 GMT

Thanks Iggi & Radek!!!