One popular MCU programmer made an YouTube stream with online testing and comparing the MCUs.
1. pin out high
2. make a test operation: a + b, a - b, a * b, a / b, sin(a), power(a, b), power(b, a), log(a), sqrt(a)
3. pin out = low
And measuring the execution time between the signal edges by the oscilloscope.
First column Tio = min time of the pulse without any operation between, it will be subtracted from all test timings.
Latest table - the Flops per megahertz MCU clock frequency.
ATmega328 - oldest and slowest, 8-bit one.
ESP all families - very slow switching ports.
ESP32 - is with very unstable timings, jitter all the time (small wobbling of the operation execution time).
RP2040 - modern, but not good.
ESP32-S2 - modern, but ... old classic ESP32 is much faster, and old ESP8266 is not so worse.
STM32G4 - modern, best, but just a bit faster than classic ESP32.
And STM32G4 with switched off FPU - is anyway better than RP2040.
ESP32-C3 - RISC-V MCU is also not good, like RP2040, the old ESP8266 is sometimes even better.
sin(a) and sinf(a) = the same results.
power(a, b) - execution time depends on the a and b. It's more fast if a < b.
RP2040 in Arduino (comparing the native its SDK) is even more slow - like ATmega328.
p.s. ESP and RP2040 IO operation speed: it looks like the Arduino makes port switching of any MCU very slow.
1. pin out high
2. make a test operation: a + b, a - b, a * b, a / b, sin(a), power(a, b), power(b, a), log(a), sqrt(a)
3. pin out = low
And measuring the execution time between the signal edges by the oscilloscope.
First column Tio = min time of the pulse without any operation between, it will be subtracted from all test timings.
Latest table - the Flops per megahertz MCU clock frequency.
ATmega328 - oldest and slowest, 8-bit one.
ESP all families - very slow switching ports.
ESP32 - is with very unstable timings, jitter all the time (small wobbling of the operation execution time).
RP2040 - modern, but not good.
ESP32-S2 - modern, but ... old classic ESP32 is much faster, and old ESP8266 is not so worse.
STM32G4 - modern, best, but just a bit faster than classic ESP32.
And STM32G4 with switched off FPU - is anyway better than RP2040.
ESP32-C3 - RISC-V MCU is also not good, like RP2040, the old ESP8266 is sometimes even better.
sin(a) and sinf(a) = the same results.
power(a, b) - execution time depends on the a and b. It's more fast if a < b.
RP2040 in Arduino (comparing the native its SDK) is even more slow - like ATmega328.
p.s. ESP and RP2040 IO operation speed: it looks like the Arduino makes port switching of any MCU very slow.
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