Hi, I tested my I2C code on ESP32, some wired things happen. And I checked the TwoWire library and got confused with the sendStop argument. I guess the sendStop can only be set to TRUE or the message won't be received or sent. I noticed ESP32 I2C used a queue system. I used Arduino boards and ESP826...

Hi, thanks.@ESP_Angus I know that. It's cool to have more hardware serials on ESP32, but I use the Hardware Serial to communicate with other Device, cause that should be Normal. I use software serials to communicate with my programmed boards, for example, ESP32 to ESP32. I don't use I2C or SPI to co...

Hi, @ESP_Angus Thanks for your reply. I get the code from this page: https://techtutorialsx.com/2017/09/30/esp32-arduino-external-interrupts/ Thanks for your advice that these lines could be canceled in the ISR, portENTER_CRITICAL_ISR(&mux); portEXIT_CRITICAL_ISR(&mux); I'm trying to do SoftwareSeri...

Hi, My code is similar to this: const byte interruptPin = 25; volatile int interruptCounter = 0; int numberOfInterrupts = 0; [b]portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;[/b] void [b]IRAM_ATTR [/b]handleInterrupt() { [b]portENTER_CRITICAL_ISR(&mux);[/b] interruptCounter++; [b]portEXIT_CRITICAL...

Thanks, JoaoLopesF
SigmaDelta is faster than DAC.
And have you compared SigmaDelta with LEDC? If just for PWM usage, is SigmaDelta still got an advantage over LEDC?

Hi, And I made more tests. The results show that the margins of the new instance are not increasing, they only change in a pattern such as (6 6 12 6 6 12). So if calculate the average of 100 instances' memory consumes, the number doesn't change. So big memory won't cause lower efficiency. My earlier...

In theory you should be able to do the same thing with classes. Allocate a block big enough to hold e.g. 1500 * sizeof(myClassType) and then break it up into 1500 pointers. Or dynamically calculating the pointer when needed based on index. You can have an init and deinit routine that works the same...

Hi, Archibald Thanks for your reply. But I'm getting confused now. I'm comparing LECC and Sigma-delta and create this topic to ask. And JoaoLopesF mentioned he used Sigma-Delta to perform a sinusoidal waveform. Do you use DAC to created the sinusoidal waveform? This is not an advantage of SigmaDelta...

Hi, Thanks, kolban. I saw the Real DAC in ESP32's GitHub readme, it's cool which Arduino doesn't have. I will test it some other day. Cause I'm an Arduino user. My first thought is if my sketches could run in this So Advanced MCU/Board :D And ESP32 shocked me with analogWrite(). :shock: Thanks, Joao...

HI, Thanks for your reply. Thanks, fly135 I start to get the logic behind the memory management. I'm a newbie to C++. :D Thanks, kolban I use Class cause I got functions in it and I got Inheritance(I use the list to hold the base class's pointer). I don't know if I could replace class with struct.I ...