esp-idf/components
Roland Dobai 2d08431433 Merge branch 'bugfix/flash_size_detect' into 'master'
Tools: Fix esptool flash size detection arguments

Closes IDFGH-7203

See merge request espressif/esp-idf!18100
2022-06-01 17:46:33 +08:00
..
app_trace Merge branch 'feature/move_dport_workaround_to_g0' into 'master' 2022-06-01 12:11:12 +08:00
app_update
asio
bootloader tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
bootloader_support secure_boot(esp32c2): Fix case when SB key is pre-loaded 2022-05-31 11:12:21 +00:00
bt Bluedroid porting changes for esp32h2 2022-05-30 08:42:45 +00:00
cmock
console
cxx tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
driver tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
efuse bootloader: Support Flash Encryption for ESP32-C2 2022-05-31 11:12:21 +00:00
esp-tls
esp_adc_cal
esp_common tcp_transport: Fix error propogation 2022-05-31 15:04:21 +05:30
esp_eth tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
esp_event tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
esp_gdbstub
esp_hid
esp_http_client esp_http_client/esp_https_ota: Removed errno checks 2022-05-31 15:04:21 +05:30
esp_http_server
esp_https_ota esp_http_client/esp_https_ota: Removed errno checks 2022-05-31 15:04:21 +05:30
esp_https_server
esp_hw_support dport: Move DPORT workaround to G0 2022-05-31 13:44:18 +08:00
esp_lcd tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
esp_local_ctrl tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
esp_netif tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
esp_phy
esp_pm
esp_ringbuf
esp_rom tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
esp_serial_slave_link
esp_system tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
esp_timer dport: Move DPORT workaround to G0 2022-05-31 13:44:18 +08:00
esp_wifi dport: Move DPORT workaround to G0 2022-05-31 13:44:18 +08:00
espcoredump tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
esptool_py Merge branch 'bugfix/flash_size_detect' into 'master' 2022-06-01 17:46:33 +08:00
fatfs Merge branch 'fix/fatfs_remove_utf16_support' into 'master' 2022-05-30 20:59:53 +08:00
freertos Merge branch 'feature/move_dport_workaround_to_g0' into 'master' 2022-06-01 12:11:12 +08:00
hal Merge branch 'feature/move_dport_workaround_to_g0' into 'master' 2022-06-01 12:11:12 +08:00
heap
http_parser
idf_test
ieee802154
json
linux
log tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
lwip tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
mbedtls
mdns tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
mqtt tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
newlib tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
nvs_flash tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
openthread
partition_table
perfmon
protobuf-c
protocomm tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
pthread pthread: add missing header 2022-05-30 12:43:36 +07:00
riscv
sdmmc
soc Merge branch 'feature/move_dport_workaround_to_g0' into 'master' 2022-06-01 12:11:12 +08:00
spi_flash tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
spiffs
tcp_transport tcp_transport: Fix error propogation 2022-05-31 15:04:21 +05:30
tinyusb
touch_element
ulp tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
unity
usb
vfs
wear_levelling tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
wifi_provisioning tools: Increase the minimal supported CMake version to 3.16 2022-06-01 06:35:02 +00:00
wpa_supplicant
xtensa system: add missing header 2022-05-30 12:43:23 +07:00
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.

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.