esp-idf/components
Rahul Tank 11c44c9838 Nimble: Added check to allocate memory for extended adv
reports from lower prioirty buffers instead of high prioirty pool.
2022-10-21 12:47:14 +05:30
..
app_trace
app_update
bootloader
bootloader_support
bt Nimble: Added check to allocate memory for extended adv 2022-10-21 12:47:14 +05:30
cmock
console
cxx
driver Merge branch 'feat/sdio_slave_disable_hs_v5.0' into 'release/v5.0' 2022-10-14 12:11:14 +08:00
efuse
esp-tls esp-tls: Fix memory leak in mbedtls ds peripheral when MBEDTLS_THREADING_C enabled 2022-10-13 19:35:04 +08:00
esp_adc esp_adc: added comments to c3 test thresh, also sync to legacy tests 2022-09-27 12:19:36 +08:00
esp_app_format
esp_common
esp_eth
esp_event
esp_gdbstub
esp_hid fix esp hid crash when auth failed 2022-10-11 20:09:16 +08:00
esp_http_client
esp_http_server esp_http_server: Add linger in httpd_config_t 2022-09-27 10:10:03 +05:30
esp_https_ota
esp_https_server
esp_hw_support Merge branch 'doc/usj_sw_reset_alive_bbpll_doc_v5.0' into 'release/v5.0' 2022-10-20 01:34:54 +08:00
esp_lcd
esp_local_ctrl
esp_netif
esp_phy
esp_pm
esp_psram
esp_ringbuf
esp_rom esp_wifi: Fix deauth and disassoc issues for SoftAP PMF 2022-10-18 09:52:19 +05:30
esp_system Merge branch 'bugfix/fix_xtal32k_error_detect_backport_v5.0' into 'release/v5.0' 2022-09-21 22:36:04 +08:00
esp_timer
esp_wifi esp_wifi: Fix deauth and disassoc issues for SoftAP PMF 2022-10-18 09:52:19 +05:30
espcoredump espcoredump: enable tests for esp32c2 target 2022-10-04 10:24:44 +05:30
esptool_py esptool: (re)populate the secure boot signing key path 2022-10-01 15:05:29 +00:00
fatfs fatfsgen.py: enabled 512 sized sectors 2022-10-03 09:33:15 +00:00
freertos
hal sdio_slave: allow disabling highspeed mode 2022-10-01 01:53:28 +08:00
heap
http_parser
idf_test
ieee802154 openthread: Add some flash optimization options for openthread component 2022-09-29 09:40:05 +08:00
json
linux
log
lwip
mbedtls
mqtt
newlib
nvs_flash
openthread openthread: Add some flash optimization options for openthread component 2022-09-29 09:40:05 +08:00
partition_table
perfmon
protobuf-c
protocomm protocomm/esp_srp: Allocate memory for username only when the 2022-10-08 10:49:44 +05:30
pthread
riscv
sdmmc
soc soc: remove soc ble config from Kconfig 2022-10-09 17:07:53 +08:00
spi_flash
spiffs
tcp_transport
tinyusb tinyusb: fix typo naming of ACM 2022-09-22 20:31:55 +08:00
touch_element
ulp
unity
usb
vfs
wear_levelling
wifi_provisioning wifi_provisioning/manager.c: Fix small bug introduced in recent MR. 2022-10-08 10:50:02 +05:30
wpa_supplicant Merge branch 'bugfix/eap_hash_key_len_validation_v5.0' into 'release/v5.0' 2022-10-14 11:16:03 +08:00
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
  • rv_utils_intr_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.

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.