topic Re: Regarding S12ZVM128. in S12 / MagniV Microcontrollers

Regarding S12ZVM128.

pratibhasurabhi — Fri, 23 Dec 2016 06:49:24 GMT

I am using MTRCKTSBNZVM128 evaluation board.I want to trigger the ADC by software using trigger mode without configuring the PMF,TIM and PTU. Could you please suggest me how to do this?

Re: Regarding S12ZVM128.

RadekS — Fri, 23 Dec 2016 13:00:11 GMT

Hi Preatibha,

You may use voltage measurement example as your inspiration:

https://community.nxp.com/docs/DOC-332475

The trigger is managed by command:

ADC0FLWCTL_TRIG = 1; //Trigger for next new conversion

The ACC_CFG bits in ADC0CTL_0 register should be configured either for Single Access Mode - Data Bus or Dual Access Mode.

I hope it helps you.

Have a great day,
Radek

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: Regarding S12ZVM128.

pratibhasurabhi — Fri, 23 Dec 2016 13:40:18 GMT

Thanks for the quick reply.If you could explain the #define INTFLG_SEL(x) and INT_FLG(x) left shifting in adc_lba.h file,it will be great.

Re: Regarding S12ZVM128.

RadekS — Tue, 03 Jan 2017 09:49:51 GMT

Hi Pratibha,

Every ADC command is configured by 4-byte configuration (ADCCMD_0 ~ ADCCMD_3).

Since these commands are loaded into ADC automatically by DMA, they must be aligned to 4-byte boundary.

The definitions in adc_lba.h file just offers user-friendly way how to configure these commands.

For example:

#define INTFLG_SEL(x) ((unsigned long)((x)&0x0F)<<24) //Conversion Interrupt Flag Select 1..15, 0 means conversion without interrupt flag

It just take lowest 4 bits from x value and move it 24 times to left into ADCCMD_0_ INTFLG_SEL[3:0] position.

The INTFLG_SEL[3:0] configure selected interrupt flag by simple binary combination value.

So, if we use INTFLG_SEL(5), the ADCCMD_0_INTFLG_SEL[3:0] will be configured as 0b0101 and ADC will set appropriate interrupt flag (in this case CON_IF[15:1]= 0x0010) when this command finish.

The ADCCONIF_CON_IF[15:1] display which flag was set. A single flag bit in CON_IF[15:1] refers to single INTFLG_SEL[3:0] bit combination.

The INTFLG_SEL(0) configuration will not set any of CON_IF[15:1] flags when command finish. When ADC command is configured as End Of Sequence/End Of List/End Of List and wait... command the ADCCONIF_EOL_IF flag may signalize end of the measurement sequence.

I hope it helps you.

Have a great day,
Radek