Enabling CPU caching degrades the sensing of DS18B20.

[KPanc.3]

I am using STM32F767ZIT for sensing of temperature using DS18B20 and displaying it on a 5 inch LCD using STemwin. My problem is that when CPU caching is enabled the DS18B20 is unable to fetch any reading(it shows 4095.5 °C which false reading) while when caching is disabled it works perfectly fine. I am using microsecond delay generation using timers of STM32 for temp sensing.

[Uwe Bonnes]

Revisit your code. look where variables are placed, double check if you use DMA.

[KPanc.3]

Means how it affects the placement?? All my variables are stack variables(local function scoped) only.

[Tesla DeLorean]

So is the problem difference in speed or cache coherency?

Using DMA?

What does the signal look like on a scope?

Confirm timing/delay loops with GPIO toggle