I need to generate header files at compile time. As https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html#makefile-componentbuild claims it can be done using Makefile.componentbuild file. However there are no examples and I can not find any in the web.

I have tried to ...

I wonder what the portMUX_INITIALIZER_UNLOCKED value actually means? I understand that spinlocks are used in order to synchronize cores when they need access to shared resource but should I always use portMUX_INITIALIZER_UNLOCKED when locking resource or I can set my own owner field in that ...

They are threadsafe, but I would not assume they are interrupt-safe. I'm not sure why you would do a malloc in an ISR anyway, and even if it worked it does not sound like a good idea;l what's your use case there?


Thanks for your reply! I allocate small event structures in order to avoid having ...

1. The I2S needs 16-bit samples, you're stashing (repeated) 8-bit samples into it.
2. The I2S reads the samples as 32-bit words and outputs the high 16-bit first and the low 16-bit second. This means that if you want to send it 16-bit samples, you'll need to swap the even and odd 16-bit words.
3 ...

Hi there!

Could anyone clarify for me please whether malloc/new are thread and interrupt safe? I can see that there is an implementation of _malloc_r in newlib directory which is considered to be thread safe. But what about common malloc? Regarding to the documentation it seems that malloc and ...

I am trying to produce sine wave with I2S. There are several strange things I have found I don't know how to overcome.
Here is my code:



#include <Arduino.h>
#include <driver/i2s.h>
#include <driver/dac.h>

/* I2S DAC */
#define DAC_CHANNEL DAC_CHANNEL_1 // GPIO25 channel

#define I2S_DAC I2S_NUM ...