Hi, I have a question. How is it with the FPU in the ESP8266 microcontrollers? Do we have an FPU on board and we can use floating point numbers without any problem, or (as in AVR) is this not advisable from an application performance point of view? Thanks in advance for your answer.

. There is no FPU in the ESP8266. It is in the ESP32 and only applies to operations on float types (and no longer double). FPU operations unfortunately pause interrupts and float variables should not be used in interrupts.

Many thanks for the clarification.

FPU in ESP8266 microcontrollers - impact on application performance

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#1 19931917 15 Mar 2022 09:55

mtbchn mtbchn

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Post #1
19931917 15 Mar 2022 09:55

Hi,
I have a question. How is it with the FPU in the ESP8266 microcontrollers? Do we have an FPU on board and we can use floating point numbers without any problem, or (as in AVR) is this not advisable from an application performance point of view?

Thanks in advance for your answer.
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#2 19932068 15 Mar 2022 11:24

khoam khoam

Level 42

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Post #2
19932068 15 Mar 2022 11:24

mtbchn wrote:
How is it with the FPU in ESP8266 microcontrollers?
.
There is no FPU in the ESP8266. It is in the ESP32 and only applies to operations on float types (and no longer double). FPU operations unfortunately pause interrupts and float variables should not be used in interrupts.
#3 19932218 15 Mar 2022 12:57

mtbchn mtbchn

Level 3

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Post #3
19932218 15 Mar 2022 12:57

Many thanks for the clarification.
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