Why does my sketch not fit?

Projects Programming
1

I'm having trouble to upload a sketch with a circular buffer. The intended size is 160,000 bytes but it will only upload when I reduce the size to 100,000 bytes.
The sketch with the reduced size will work, but I want at least 10 second of playing time in the buffer.

#define C_BUF_SIZE 100000   // 160.000 to large; is not uploading

I use the default partition scheme as defined in default.csv like this:

# Name,   Type, SubType, Offset,  Size, Flags
nvs,      data, nvs,     0x9000,  0x5000,
otadata,  data, ota,     0xe000,  0x2000,
app0,     app,  ota_0,   0x10000, 0x140000,
app1,     app,  ota_1,   0x150000,0x140000,
spiffs,   data, spiffs,  0x290000,0x170000,

And the compiler output is:

Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Auto-detected Flash size: 4MB
Compressed 8192 bytes to 47...
Wrote 8192 bytes (47 compressed) at 0x0000e000 in 0.0 seconds (effective 5491.1 kbit/s)...
Hash of data verified.
Compressed 17392 bytes to 11186...
Wrote 17392 bytes (11186 compressed) at 0x00001000 in 0.1 seconds (effective 992.5 kbit/s)...
Hash of data verified.
Compressed 695680 bytes to 389570...
Wrote 695680 bytes (389570 compressed) at 0x00010000 in 6.0 seconds (effective 932.8 kbit/s)...
Hash of data verified.
Compressed 3072 bytes to 128...
Wrote 3072 bytes (128 compressed) at 0x00008000 in 0.0 seconds (effective 1823.0 kbit/s)...
Hash of data verified.

If I interpret this right then there is a:
total memory use: 47 + 11,186 + 389,570 + 128 = 400,931 bytes, which is well within the maximum of 0x140000 = 1.310.720 bytes.

So, why is this sketch not uploading?

2

Where is an error message?

3

How much RAM the processor HAS is not important. How much is available TO YOU is very important. The WiFi and other features consume quite a bit of the available RAM.

Compile a minimal sketch, like Blink, and see how much RAM is used, and how much is left. That will answer your question for you.

4

@RayLivingston
When the compiler reports for example:

Compressed 695680 bytes to 389570...[color=#222222][/color]
Wrote 695680 bytes (389570 compressed) at 0x00010000 in 6.0 seconds (effective 932.8 kbit/s)...[color=#222222][/color]
Hash of data verified.[color=#222222][/color]

Are you telling that the actual sketch size is very much than reported?

5

That is the output from the upload. You need to look at the output from the compile/link, which will tell you exactly how much RAM is used, and how much is free.

6

The best information I've found on this subject is: Where goes the (ESP32-) Memory? - Programming Questions - Arduino Forum

My workaround on the issue at hand is this:
Define and initialize a rather small buffer as global var:

cbuf circBuffer(1000);

Then in setup use the resize function that comes with the buffer library:

  circBuffer.resize(C_BUF_SIZE);

C_BUF_SIZE here is what I want it to be: 160.000 bytes.

7

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