S32KのトピックRe: BCTU List Items

BCTU List Items

PINKMAN — Sat, 21 Jun 2025 13:43:42 GMT

hi experts:

I used two ADC instances ,ADC0 has 4 channel p0 p1 p2 S9 ADC1 has 2channels P0 S8. i want to use PIT-->TRGMUX--> BCTU-->ADC0&ADC1.

my confusion is that ,how to config the BCTU List Items.i know that ADC target mask should be 0b11 standfor ADC0&ADC1

but what is hard to understand is that BCTU List Items, i have 6 channels , when the watermark nofify ,

the BctuDmaFifo[0] is ADC0_P0?

the BctuDmaFifo[1] is ADC0_P1?

the BctuDmaFifo[2] is ADC0_P2?

the BctuDmaFifo[3] is ADC0_S9?

the BctuDmaFifo[4] is ADC1_P0?

the BctuDmaFifo[5] is ADC1_S8?

the BctuDmaFifo[0] is ADC0_P0?

the BctuDmaFifo[1] is ADC1_P0?

the BctuDmaFifo[2] is ADC0_P1?

the BctuDmaFifo[3] is ADC1_S8?

if so ,what about the channels left, it make no sense,it's hard to underdstand

there is a demo picture, i still can't understnd

Re: BCTU List Items

PetrS — Mon, 23 Jun 2025 11:20:28 GMT

Hi,

if you do multiple parallel conversions, then the items in BCTU list are taken in pairs (triples), so if demo picture shows parallel conversion on ADC0&ADC1 (mask=3) then the meaning of list on picture is correct.

For your desired conversions you need to add two dummy samples for ADC1, for example repeat previous two. In the BCTU list you will have 8 items
p0 ... ADC0
p0 ... ADC1
p1 ... ADC0
s8 ... ADC1
p2 ... ADC0
p0 ... ADC1
s9 ... ADC0
s8 ... ADC1

Mark last channels properly and set watermark = 7

BR, Petr

Re: BCTU List Items

PINKMAN — Tue, 24 Jun 2025 07:01:53 GMT

I got it. Your explanation has very accurately resolved my confusion, and "dummy sample" is quite interesting.