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[esp32] Disable newlib nano printf formatting on ESP32-C2 (#19418)

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Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
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Jonathan Swoboda
2026-09-29 12:57:35 +13:00
committed by Jesse Hills
co-authored by Claude Fable 5.1
parent 0575eb14f2
commit e6d124d229
1 changed files with 5 additions and 0 deletions
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esphome/components/esp32/__init__.py
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@@ -2628,6 +2628,11 @@ async def to_code(config):
config.get(CONF_ENGINEERING_SAMPLE, False),
)
# ESP32-C2 defaults to the ROM's newlib "nano" printf, which does not
# understand %zu or %lld and crashes on any %s that follows one.
if variant == VARIANT_ESP32C2:
add_idf_sdkconfig_option("CONFIG_LIBC_NEWLIB_NANO_FORMAT", False)
# Set minimum chip revision for ESP32 variant
# Setting this to 3.0 or higher reduces flash size by excluding workaround code,
# and for PSRAM users saves significant IRAM by keeping C library functions in ROM.