Typo corrections
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Smart Config
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Smart Config
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===
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============
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API Reference
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API Reference
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-------------
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-------------
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@ -131,7 +131,7 @@ Component Makefiles
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Each project contains one or more components, which can either be part of esp-idf or added from other component directories.
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Each project contains one or more components, which can either be part of esp-idf or added from other component directories.
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A component is any sub-directory that contains a `component.mk` file.[#f1]_.
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A component is any sub-directory that contains a `component.mk` file [#f1]_.
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Minimal Component Makefile
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Minimal Component Makefile
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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@ -464,7 +464,7 @@ The file's contents will be added to the .rodata section in flash, and are avail
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The names are generated from the full name of the file, as given in COMPONENT_EMBED_FILES. Characters /, ., etc. are replaced with underscores. The _binary prefix in the symbol name is added by objcopy and is the same for both text and binary files.
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The names are generated from the full name of the file, as given in COMPONENT_EMBED_FILES. Characters /, ., etc. are replaced with underscores. The _binary prefix in the symbol name is added by objcopy and is the same for both text and binary files.
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For an example of using this technique, see examples/protocols/https_request - the certificate file contents are loaded from the text .pem file at compile time.
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For an example of using this technique, see `examples/protocols/https_request <https://github.com/espressif/esp-idf/tree/master/examples/protocols/https_request>`_ - the certificate file contents are loaded from the text .pem file at compile time.
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Fully Overriding The Component Makefile
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Fully Overriding The Component Makefile
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@ -485,7 +485,7 @@ is set then the component can instruct the linker to link other binaries instead
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.. _esp-idf-template: https://github.com/espressif/esp-idf-template
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.. _esp-idf-template: https://github.com/espressif/esp-idf-template
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.. _GNU Make Manual: https://www.gnu.org/software/make/manual/make.html
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.. _GNU Make Manual: https://www.gnu.org/software/make/manual/make.html
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.. _[_f1]: Actually, some components in esp-idf are "pure configuration" components that don't have a component.mk file, only a Makefile.projbuild and/or Kconfig.projbuild file. However, these components are unusual and most components have a component.mk file.
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.. [#f1] Actually, some components in esp-idf are "pure configuration" components that don't have a component.mk file, only a Makefile.projbuild and/or Kconfig.projbuild file. However, these components are unusual and most components have a component.mk file.
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Custom sdkconfig defaults
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Custom sdkconfig defaults
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@ -28,7 +28,7 @@ Contents:
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:maxdepth: 1
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:maxdepth: 1
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General Notes <general-notes>
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General Notes <general-notes>
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Build System <build_system>
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Build System <build-system>
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Debugging <openocd>
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Debugging <openocd>
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ESP32 Core Dump <core_dump>
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ESP32 Core Dump <core_dump>
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Partition Tables <partition-tables>
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Partition Tables <partition-tables>
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@ -291,11 +291,13 @@ Flash Encryption Algorithm
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- Each 32 byte block is encrypted with a unique key which is derived from this main flash encryption key XORed with the offset of this block in the flash (a "key tweak").
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- Each 32 byte block is encrypted with a unique key which is derived from this main flash encryption key XORed with the offset of this block in the flash (a "key tweak").
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- The specific tweak depends on the setting of ``FLASH_CRYPT_CONFIG`` efuse. This is a 4 bit efuse, where each bit enables XORing of a particular range of the key bits:
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- The specific tweak depends on the setting of ``FLASH_CRYPT_CONFIG`` efuse. This is a 4 bit efuse, where each bit enables XORing of a particular range of the key bits:
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- Bit 1, bits 0-66 of the key are XORed.
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- Bit 1, bits 0-66 of the key are XORed.
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- Bit 2, bits 67-131 of the key are XORed.
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- Bit 2, bits 67-131 of the key are XORed.
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- Bit 3, bits 132-194 of the key are XORed.
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- Bit 3, bits 132-194 of the key are XORed.
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- Bit 4, bits 195-256 of the key are XORed.
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- Bit 4, bits 195-256 of the key are XORed.
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It is recommended that ``FLASH_CRYPT_CONFIG`` is always left to set the default value `0xF`, so that all key bits are XORed with the block offset. See `Setting FLASH_CRYPT_CONFIG` for details.
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It is recommended that ``FLASH_CRYPT_CONFIG`` is always left to set the default value `0xF`, so that all key bits are XORed with the block offset. See `Setting FLASH_CRYPT_CONFIG` for details.
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- The high 19 bits of the block offset (bit 5 to bit 23) are XORed with the main flash encryption key. This range is chosen for two reasons: the maximum flash size is 16MB (24 bits), and each block is 32 bytes so the least significant 5 bits are always zero.
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- The high 19 bits of the block offset (bit 5 to bit 23) are XORed with the main flash encryption key. This range is chosen for two reasons: the maximum flash size is 16MB (24 bits), and each block is 32 bytes so the least significant 5 bits are always zero.
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@ -32,7 +32,8 @@ N/C | WP |
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This example doesn't utilize card detect (CD) and write protect (WP) signals from SD card slot.
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This example doesn't utilize card detect (CD) and write protect (WP) signals from SD card slot.
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### Note about GPIO2
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### Note about GPIO2
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GPIO2 pin is used as a bootstrapping pin, and should be low to enter UART download mode. One way to do this is to connect GPIO0 and GPIO2 using a jumper, and then the auto-reset circuit on most development boards will pull GPIO2 low along with GPIO2, when entering download mode.
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GPIO2 pin is used as a bootstrapping pin, and should be low to enter UART download mode. One way to do this is to connect GPIO0 and GPIO2 using a jumper, and then the auto-reset circuit on most development boards will pull GPIO2 low along with GPIO0, when entering download mode.
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### Note about GPIO12
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### Note about GPIO12
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