code is too big

[glory666g]

Board

ESP32-S3

Device Description

ESP32-S3-Korvo-2

Hardware Configuration

no

Version

latest stable Release (if not listed below)

IDE Name

Arduino IDE

Operating System

Windows 11

Flash frequency

240MHz

PSRAM enabled

yes

Upload speed

115200

Description

I need to use a big unsigned char array,but the Arduino IDE compile not passed because the array is too big.How can i solve this problem?
The array has 4M elements.

Sketch

Bandwidth exhausted or memory limit exceeded

Debug Message

no

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[SuGlider]

I need to use a big unsigned char array,but the Arduino IDE compile not passed because the array is too big.How can i solve this problem?
The array has 4M elements.

Is it an immutable type of data, meaning that the bytes won't change along the execution of the application?
In such case it can be stored in the Flash, by declaring it as
const char Array[4 * 1024 * 1024] = { byte1, bytes2, ... , byte4194304 };

It is also necessary to correctly set the Partition Scheme to have an application partition that can store the firmware size plus the 4MB data.

---

Otherwise, if the data must be allocated to RAM, it shall go to a PSRAM sized to store such volume of data.
Declaration shall be something like:

char *bigArray = NULL;

void setup() {
  bigArray = (char *) malloc(4 * 1024 * 1024);
  if (bigArray == NULL) {
    log_e("Memory allocation in PSRAM has failed.");
  }
  // populating the array with sequence values
  for (uint32_t i = 0; i < 4 * 1024 * 1024; i++) {
    bigArray[i] = (char) i & 0xFF;
  }
}