There's also https://github.com/X-Ryl669/tinytinycompress which implement both a compressor and decompressor with as small as 4 bytes for required RAM (and configurable RAM for compressor, can be as low as 128 bytes). It's probably not as efficient as zlib, but it's darn fast and doesn't have any ...

Well, it turns out it's completely possible to set up 2 wake up sources from deep sleep, so the above is actually not required. In the end, for simple interrupt based solution, running the LP core isn't actually required, or, only to assert the state of the system once one of the interrupt has ...

Hi,

I'm doing a very low power product where I'm saving the very last joule I can. In this case, I've done this:

HP core is woken up very very very rarely (only for communicating)
HP core deep sleep for a given amount of time and wake up the LP core
LP core sets up two interrupt handler (one ...

I can't answer all your question since I'm still learning. But I can answer the last one: there isn't any heap on the LP cpu, so the memory usage can't change for the whole duration of the program. You could, theoretically access any byte on the available 16kB address space, but the way the ...

Sorry, I missed your answer. You're right, the &dataBuffer[i * 3] should read &dataBuffer[index * 3] . index will never be 2, so it's safe.

In fact I've made many progress on diagnosing the issue, see here . In short, the I2C HW crashes when queueing more than 2 transactions. Either we need to ...

In fact, esp_config.h includes mbedtls_config.h that doesn't exist either, so it doesn't solve the issue.

Hi,

I'm trying to create a single object that's storing the transactions to happen on I2C bus by queueing all the operations and expecting the CPU to run them all correctly. Typically, I'm doing this (pseudo code):

#define FilterError(x) ((x) == ESP_OK)

uint8 buffer[I2C_LINK_RECOMMENDED_SIZE(4 ...

It's likely too late, but you have 3 options, depending on what are your latency expectations:


If more than 10µs is acceptable and you still want to use a FreeRTOS task, use xTaskNotifyFromISR() in place of a queue, it's much faster. BTW, don't call portYieldFromISR unconditionally. You need to ...

Currently, the default HTTP client in the component library is a monster. Instantiating it adds ~160kB of binary size when compiled with -Os (and this is likely multiplied 3x if using factory + 2 OTA partitions).
Looking at the code, it seems that it's using nghttp underneath and such library is a ...