MPC5777C EQADC configuration

[vrushalitaklika]

Hi, I am trying to initalise EQADC0 in MPC5777C controller.

How do I configure EQADC.CFPR register with below configuration

/* Send CFIFO 0 a ADC0 configuration command */
/* enable ADC0 & sets prescaler= divide by 10 */

In the datasheet EQADC.CFPR register does not have register bitwise e4xplanation.

Can someone help on configuraing CFPR register.

Thanks

Vrushali

[vrushalitaklika]

Hi,

I have a confusion on using CFPR and RFPR register.

How to decide when to use CFPR[0] CFPR[1] CFPR[2]... and same for RFPR[0]. RFPR[1].

Here is my implementation is this correct

EQADC_A.CFPR[0].R = 0x00000000 | (ANA12_TO_ADC_IA1<<8) ;
EQADC_A.CFPR[0].R = 0x00100000 | (ANA21_TO_ADC_DCLINK1_LK<<8) ;
EQADC_A.CFPR[0].R = 0x80200000 | (ANA6_TO_ADC_DCLINK1_V<<8) ;
EQADC_A.CFPR[1].R = 0x00000000 | (ANA34_TO_ADC_INV1_TA <<8) | (1 << 24); //1 is calibration value
EQADC_A.CFPR[1].R = 0x00100000 | (ANA35_TO_ADC_INV1_TB <<8) | (1 << 24); //1 is calibration value
EQADC_A.CFPR[1].R = 0x00200000 | (ANA36_TO_ADC_INV1_TD <<8) | (1 << 24); //1 is calibration value
EQADC_A.CFPR[1].R = 0x80300000 | (ANA37_TO_ADC_INV1_TC <<8) | (1 << 24); //1 is calibration value

Thanks

Vrushali

[davidtosenovjan]

CFPRx/RFPRx chooses particular Command/Result FIFO number. Lower FIFO number has higher priority when priority processing is necessary.

Choosing of FIFO is completely up to you.

[vrushalitaklika]

Thanks David.

I have 10 analog channels to convert, and we have 6 RFIFO, can you suggest how can we convert all 10 channels in one function itself.

[davidtosenovjan]

Also you could pay attention to short bulletin I have written:

https://community.nxp.com/docs/DOC-329779 

[vrushalitaklika]

Hi David,

Do you have example of document eQADC - avoiding unintended result swap  ?

Have you implemented the solutions? I am looking for 4th solution proposed

4) To keep regular alternating of commands assigned to ADC0 and ADC1.

Thanks

Vrushali

[davidtosenovjan]

How I said it is completely application dependent. If you only need to convert 10 channels in sequence, you can just use only CFIFO0 and RFIFO0, for instance.

[vrushalitaklika]

Thanks David

[davidtosenovjan]

It is register for writing commands to CFIFO either due to conversion command in standard or alternate configuration or for indirect access to On-Chip ADC registers.

I could recommend you to see following example codes:

Example MPC5674F eQADC+eDMA Single_Scan CW210 

Example MPC5674F eQADC+eDMA Continuous_Scan CW210 

Example MPC5644A eQADC channel 146 conversion+calibration CW210 

Also I am attaching header file that could be possibly useful for you.

[vrushalitaklika]

Hi David, do you have a C file where you have used this eqadc_mamcros_Mamba.h file

Thanks

Vrushali

[davidtosenovjan]

I have used it in this example:

Example MPC5674F eQADC-Streaming Mode CW210 

[vrushalitaklika]

Thanks David.

I implemented same way.

However my requirement is, I have to use

22 channels of EQADCA and 7 channels of EQADC B

How do I modular the code so that for every channel configuration same function is called always.

Also need clarification when to use CFPR[0] and CFPR[1]  etc and likewise CFCR0 and CRFR1 registers etc.

Here is my init and send and receive functions.

void eqadc_init (struct EQADC_tag *my_eqadc)
{
/* CBuffer0 */

my_eqadc->CFPR[0].R = B0 | MESSAGE_TAG(NULL_M) | LST(CYCLES_2) | CHANNEL(4);
my_eqadc->CFPR[0].R = EOQ | B1 | MESSAGE_TAG(NULL_M) | LST(CYCLES_2) | CHANNEL(4);

/*Trigger CFIFO 0 using Single Scan SW mode */
my_eqadc->CFCR0.R= SINGLE_SCAN_ENABLE | MODEx(SOFTWARE_TRIGGER_SINGLE_SCAN);

/*Wait for End Of Queue flag*/
while(my_eqadc->FISR[0].B.EOQFX != 1) {}
my_eqadc->FISR[0].R = End_of_Queue_Flag;

}

void SendConvCmd(struct EQADC_tag *my_eqadc, int channelnum)
{
/* Conversion command: convert channel 5 */
/* with ADC0, set EOQ */
my_eqadc->CFPR[0].R = EOQ | channelnum<<8;
}

void ReadResult(struct EQADC_tag *my_eqadc, int *Result)
{
while(my_eqadc->FISR[0].B.RFDFX != 1){}; /* Wait for RFIFO 0's Drain Flag to set */
Result = my_eqadc->RFPR[0].R; /* ADC result */
//ResultInMv = (vuint32_t)((5000*Result)/0x3FFC);
my_eqadc->FISR[0].R = RFIFO_Drain_Flag; /* Clear RFIFO 0's Drain Flag */

}

From main function I am calling it as below

eqadc_init(&EQADC_A);
eqadc_init(&EQADC_B);

SendConvCmd(&EQADC_A, 4); // here 4 corresponds to channel no 4
ReadResult(&EQADC_A, &duty);