This project uses CoopOS "classic" - no stackframes
Another version with CoopOS_Stack (each Task has its own Stack) is running.
Will be published soon.

STM32F407 - Some Tests with RTOS / CoopOS, DAC, InputCapture

Running RTOS or CoopOS

> 750000 External Interrupts / s

> 750000 DA Conversions / s

> 50000 Task Switches / s (RTOS and CoopOS)

Use InputCapture for 6 ns Ticks

Complete documented Source and 14 Page Explanation

There is a silent revolution: The MCUs of today are so mighty. They will change our world within some years !

Small ESP8266 are VERY cheap today. ESP32 impresses with 2 indepentent cores. Now I ordered 2 boards from China:

1. STM32F103 (bluepill) for amazing 1.79€ (including porto)
2. STM32F407 (blackboard) for 7.79€

Here are my first tests.

!!! Please read Comment.pdf for more information !!!

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BTW: Task Switches

A lot of people think, an RTOS with a ticktime of 1ms will change to the (READY-)task with highest priority ever 1 ms.

That is not true !

Most RTOS Tasks have a TaskYIELD(), vTaskDelay() or a "wait for something" inside. And that means the tasks give up their CPU time very frequently! You will find tasks, which use the full 1 ms time, not very often ! So it could be very important to analyse how long the longest gap is between task switches. Mostly this gap is much smaller than 1 ms. If this gap is for instance garanteed smaller than 100 us then you can say, that a READY task never has to wait longer than 100 us for its execution - even if the ticktime is 1 ms.

** This time may be very important !

Here I show how to measure this time gap.

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Requisits:

1. Arduino-IDE 1.8.10

2. Boards Definition: https://github.com/danieleff/STM32GENERIC It includes freeRTOS library

3. Toolchain as mentioned in 2)

4. Unzip STM32F4_Timer1_InputCaptureISR_BU4.zip into your Arduino Sketches folder

5. STM32F407VE (Black Board)

6. USB-FTDI to connect Board to PC

7. Scope and/or Logic Analyser are highly recommended !