esp-idf/components
Michael (XIAO Xufeng) f810eb7a39 ci: Fix environment variable IDF_CI_BUILD is not set 2023-12-23 18:47:36 +08:00
..
app_trace
app_update fix(app_update): avoid erasing an extra sector than the actual required size 2023-12-04 18:48:55 +05:30
asio
bootloader
bootloader_support fix(esp_hw_support): fix lightsleep current leakage on usb-phy controlled pad 2023-11-20 11:25:28 +08:00
bt fix(bt/bluedroid): fixed btc_config_lock error 2023-12-22 11:31:18 +08:00
cbor
cmock
coap
console
cxx
driver Merge branch 'fix/twai_tag_not_defined_in_configure_gpio_v4.4' into 'release/v4.4' 2023-12-21 11:47:47 +08:00
efuse
esp-tls
esp32
esp32c3 feat(soc): Increase max supported version of C3 to 1.99 2023-12-06 17:05:24 +08:00
esp32h2
esp32s2
esp32s3
esp_adc_cal fix(adc): rename ADC_ATTEN_DB_11 to ADC_ATTEN_DB_12 2023-11-08 03:44:43 +00:00
esp_common ci: Fix environment variable IDF_CI_BUILD is not set 2023-12-23 18:47:36 +08:00
esp_eth bugfix(esp_eth): improved error handling of _recv_buf 2023-11-23 17:22:42 +01:00
esp_event
esp_gdbstub
esp_hid fix(bt/bluedroid): Optimize compatibility with Android 10 and later devices 2023-10-31 14:42:33 +08:00
esp_http_client
esp_http_server
esp_https_ota fix(esp_https_ota): fix return code of esp_https_ota_finish API 2023-11-22 17:15:19 +05:30
esp_https_server
esp_hw_support ci: Fix environment variable IDF_CI_BUILD is not set 2023-12-23 18:47:36 +08:00
esp_ipc
esp_lcd
esp_local_ctrl
esp_netif Merge branch 'bufix/Backport_some_lwip_bugs_for_4.4_1204' into 'release/v4.4' 2023-12-05 11:13:06 +08:00
esp_phy fix(phy): Fix ble tx ifs time for ESP32 2023-12-22 14:35:17 +08:00
esp_pm fix(esp_pm): fix psram access faild after pd_cpu wakeup 2023-11-13 16:39:31 +08:00
esp_ringbuf
esp_rom fix(WiFi): update esp32s3 rom ld 2023-12-16 13:33:26 +08:00
esp_serial_slave_link
esp_system brownout: Disable the hardware BOD when BOD interrupt is enabled 2023-11-28 17:01:19 +08:00
esp_timer
esp_websocket_client
esp_wifi fix(esp_wifi):Fix WDT when esp_supp_dpp_start_listen called multiple times 2023-12-15 18:28:45 +05:30
espcoredump fix(tools/coredump-info): pass non-default partition table offset to esp-coredump 2023-11-09 10:35:24 +01:00
esptool_py
expat
fatfs feat(storage/fatfs): add sbom file manifest for FatFs (v4.4) 2023-12-11 18:14:25 +08:00
freemodbus
freertos fix(freertos): Fixed a failing scheduler suspension unit test 2023-12-20 14:44:42 +01:00
hal Merge branch 'bugfix/bod_intr_v4.4' into 'release/v4.4' 2023-12-21 10:35:09 +08:00
heap fix(heap): Fixed integrity check on used blocks by the tlsf component 2023-11-08 04:18:21 +00:00
idf_test
ieee802154
jsmn
json
libsodium
linux
log
lwip optimize(lwip):when psram is enable the number of ooseq is not limited 2023-12-15 15:54:31 +08:00
mbedtls Merge branch 'fix/aes_mpi_interrupt_allocation_workflow_v4.4' into 'release/v4.4' 2023-12-15 17:12:42 +08:00
mdns
mqtt
newlib
nghttp feat(nghttp2): Update nghttp2 lib to v1.58.0 2023-12-06 11:52:01 +05:30
nvs_flash Revert "Merge branch 'bugfix/nvs_read_out_of_bounds' into 'release/v4.4'" 2023-12-12 13:30:50 +08:00
openssl
openthread
partition_table
perfmon
protobuf-c
protocomm
pthread
riscv
sdmmc
soc Merge branch 'fix/esp32s3_soc_drom_high_addr_v4.4' into 'release/v4.4' 2023-12-12 10:04:57 +08:00
spi_flash fix(mmap): fix esp32s3 mmap test wrong assertion 2023-11-07 10:35:29 +08:00
spiffs
tcp_transport
tcpip_adapter
tinyusb
touch_element
ulp
unity
usb fix(esp_hw_support): fix lightsleep current leakage on usb-phy controlled pad 2023-11-20 11:25:28 +08:00
vfs
wear_levelling
wifi_provisioning
wpa_supplicant fix(wpa_supplicant): Move concurrent wps and dpp check to before creating task 2023-12-15 18:46:17 +05:30
xtensa
README.md

README.md

Core Components

Overview

This document contains details about what the core components are, what they contain, and how they are organized.

Organization

The core components are organized into two groups.

The first group (referred to as G0 from now on) contains hal, xtensa and riscv (referred to as arch components from now on), esp_rom, esp_common, and soc. This group contain information about and low-level access to underlying hardware; or in the case of esp_common, hardware-agnostic code and utilities. These components can depend on each other, but as much as possible have no dependencies outside the group. The reason for this is that, due to the nature of what these components contain, the likelihood is high that a lot of other components will require these. Ideally, then, the dependency relationship only goes one way. This makes it easier for these components, as a group, to be usable in another project. One can conceivably implement a competing SDK to ESP-IDF on top of these components.

The second group (referred to as G1 from now on) sits at a higher level than the first group. This group contains the components esp_hw_support, esp_system, newlib, spi_flash, freertos, log, and heap. Like the first group, circular dependencies within the group are allowed; and being at a higher level, dependency on the first group is allowed. These components represent software mechanisms essential to building other components.

Descriptions

The following is a short description of the components mentioned above.

G0 Components

hal

Contains the hardware abstraction layer and low-level operation implementations for the various peripherals. The low-level functions assign meaningful names to register-level manipulations; the hardware abstraction provide operations one level above this, grouping these low-level functions into routines that achieve a meaningful action or state of the peripheral.

Example:

  • spi_flash_ll_set_address is a low-level function part of the hardware abstraction spi_flash_hal_read_block

arch

Contains low-level architecture operations and definitions, including those for customizations (can be thought of on the same level as the low-level functions of hal). This can also contain files provided by the architecture vendor.

Example:

  • xt_set_exception_handler
  • riscv_global_interrupts_enable
  • ERI_PERFMON_MAX

esp_common

Contains hardware-agnostic definitions, constants, macros, utilities, 'pure' and/or algorithmic functions that is useable by all other components (that is, barring there being a more appropriate component to put them in).

Example:

  • BIT(nr) and other bit manipulation utilities in the future
  • IDF_DEPRECATED(REASON)
  • ESP_IDF_VERSION_MAJOR

soc

Contains description of the underlying hardware: register structure, addresses, pins, capabilities, etc.

Example:

  • DR_REG_DPORT_BASE
  • SOC_MCPWM_SUPPORTED
  • uart_dev_s

esp_rom

Contains headers, linker scripts, abstraction layer, patches, and other related files to ROM functions.

Example:

  • esp32.rom.eco3.ld
  • rom/aes.h

G1 Components

spi_flash

SPI flash device access implementation.

freertos

FreeRTOS port to targets supported by ESP-IDF.

log

Logging library.

heap

Heap implementation.

newlib

Some functions n the standard library are implemented here, especially those needing other G1 components.

Example:

  • malloc is implemented in terms of the component heap's functions
  • gettimeofday is implemented in terms of system time in esp_system

esp_system

Contains implementation of system services and controls system behavior. The implementations here may take hardware resources and/or decide on a hardware state needed for support of a system service/feature/mechanism. Currently, this encompasses the following, but not limited to:

  • Startup and initialization
  • Panic and debug
  • Reset and reset reason
  • Task and interrupt watchdogs

esp_hw_support

Contains implementations that provide hardware operations, arbitration, or resource sharing, especially those that is used in the system. Unlike esp_system, implementations here do not decide on a hardware state or takes hardware resource, acting merely as facilitator to hardware access. Currently, this encompasses the following, but not limited to:

  • Interrupt allocation
  • Sleep functions
  • Memory functions (external SPIRAM, async memory, etc.)
  • Clock and clock control
  • Random generation
  • CPU utilities
  • MAC settings

esp_hw_support vs esp_system

This section details list some implementations and the reason for placing it in either esp_hw_support or esp_system.

task_wdt.c (esp_system) vs intr_alloc.c (esp_hw_support)

The task watchdog fits the definition of taking and configuring hardware resources (wdt, interrupt) for implementation of a system service/mechanism.

This is in contrast with interrupt allocation that merely facilitates access to the underlying hardware for other implementations - drivers, user code, and even the task watchdog mentioned previously!

crosscore_int.c (esp_system)

The current implementation of crosscore interrupts is tightly coupled with a number of interrupt reasons associated with system services/mechanisms: REASON_YIELD (scheduler), REASON_FREQ_SWITCH (power management) REASON_PRINT_BACKTRACE (panic and debug).

However, if an implementation exists that makes it possible to register an arbitrary interrupt reason - a lower level inter-processor call if you will, then this implementation is a good candidate for esp_hw_support. The current implementation in esp_system can then just register the interrupt reasons mentioned above.

esp_mac.h, esp_chip_info.h, esp_random.h (esp_hw_support)

The functions in these headers used to be in esp_system.h, but have been split-off. However, to maintain backward compatibility, esp_system.h includes these headers.

The remaining functions in esp_system.h are those that deal with system behavior, such as esp_register_shutdown_handler, or are proxy for other system components's APIs such as esp_get_free_heap_size.

The functions split-off from esp_system.h are much more hardware manipulation oriented such as: esp_read_mac, esp_random and esp_chip_info.