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[qr_code] Allocate and free memory for QR code buffer (#13161)

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Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: J. Nick Koston <nick@home-assistant.io>
Co-authored-by: J. Nick Koston <nick@koston.org>
This commit is contained in:
John Stenger
2026-01-15 11:18:08 -08:00
committed by Jonathan Swoboda
parent 3f6412ba07
commit f88cf1b83a
1 changed files with 9 additions and 0 deletions
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9
esphome/components/qr_code/qr_code.cpp
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@@ -27,7 +27,16 @@ void QrCode::set_ecc(qrcodegen_Ecc ecc) {
void QrCode::generate_qr_code() {
ESP_LOGV(TAG, "Generating QR code");
#ifdef USE_ESP32
// ESP32 has 8KB stack, safe to allocate ~4KB buffer on stack
uint8_t tempbuffer[qrcodegen_BUFFER_LEN_MAX];
#else
// Other platforms (ESP8266: 4KB, RP2040: 2KB, LibreTiny: ~4KB) have smaller stacks
// Allocate buffer on heap to avoid stack overflow
auto tempbuffer_owner = std::make_unique<uint8_t[]>(qrcodegen_BUFFER_LEN_MAX);
uint8_t *tempbuffer = tempbuffer_owner.get();
#endif
if (!qrcodegen_encodeText(this->value_.c_str(), tempbuffer, this->qr_, this->ecc_, qrcodegen_VERSION_MIN,
qrcodegen_VERSION_MAX, qrcodegen_Mask_AUTO, true)) {