151 lines
5.8 KiB
Markdown
151 lines
5.8 KiB
Markdown
# Console Example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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This example illustrates the usage of the [Console Component](https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/console.html#console) to create an interactive shell on the ESP32. The interactive shell running on the ESP32 can then be controlled/interacted with over a serial port (UART).
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The interactive shell implemented in this example contains a wide variety of commands, and can act as a basis for applications that require a command-line interface (CLI).
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## How to use example
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### Hardware Required
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This example should be able to run on any commonly available ESP32 development board.
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### Configure the project
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```
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idf.py menuconfig
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```
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* Enable/disable `Example Configuration > Store command history in flash` as necessary
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(Replace PORT with the name of the serial port to use.)
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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Enter the `help` command get a full list of all available commands. The following is a sample session of the Console Example where a variety of commands provided by the Console Example are used. Note that GPIO15 is connected to GND to remove the boot log output.
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```
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This is an example of ESP-IDF console component.
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Type 'help' to get the list of commands.
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Use UP/DOWN arrows to navigate through command history.
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Press TAB when typing command name to auto-complete.
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[esp32]> help
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help
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Print the list of registered commands
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free
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Get the total size of heap memory available
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restart
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Restart the program
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deep_sleep [-t <t>] [--io=<n>] [--io_level=<0|1>]
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Enter deep sleep mode. Two wakeup modes are supported: timer and GPIO. If no
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wakeup option is specified, will sleep indefinitely.
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-t, --time=<t> Wake up time, ms
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--io=<n> If specified, wakeup using GPIO with given number
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--io_level=<0|1> GPIO level to trigger wakeup
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join [--timeout=<t>] <ssid> [<pass>]
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Join WiFi AP as a station
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--timeout=<t> Connection timeout, ms
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<ssid> SSID of AP
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<pass> PSK of AP
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[esp32]> free
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257200
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[esp32]> deep_sleep -t 1000
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I (146929) deep_sleep: Enabling timer wakeup, timeout=1000000us
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I (619) heap_init: Initializing. RAM available for dynamic allocation:
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I (620) heap_init: At 3FFAE2A0 len 00001D60 (7 KiB): DRAM
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I (626) heap_init: At 3FFB7EA0 len 00028160 (160 KiB): DRAM
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I (645) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
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I (664) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
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I (684) heap_init: At 40093EA8 len 0000C158 (48 KiB): IRAM
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This is an example of ESP-IDF console component.
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Type 'help' to get the list of commands.
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Use UP/DOWN arrows to navigate through command history.
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Press TAB when typing command name to auto-complete.
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[esp32]> join --timeout 10000 test_ap test_password
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I (182639) connect: Connecting to 'test_ap'
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I (184619) connect: Connected
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[esp32]> free
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212328
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[esp32]> restart
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I (205639) restart: Restarting
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I (616) heap_init: Initializing. RAM available for dynamic allocation:
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I (617) heap_init: At 3FFAE2A0 len 00001D60 (7 KiB): DRAM
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I (623) heap_init: At 3FFB7EA0 len 00028160 (160 KiB): DRAM
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I (642) heap_init: At 3FFE0440 len 00003BC0 (14 KiB): D/IRAM
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I (661) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
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I (681) heap_init: At 40093EA8 len 0000C158 (48 KiB): IRAM
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This is an example of ESP-IDF console component.
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Type 'help' to get the list of commands.
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Use UP/DOWN arrows to navigate through command history.
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Press TAB when typing command name to auto-complete.
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[esp32]>
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```
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## Troubleshooting
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### Line Endings
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The line endings in the Console Example are configured to match particular serial monitors. Therefore, if the following log output appears, consider using a different serial monitor (e.g. Putty for Windows) or modify the example's [UART configuration](#Configuring-UART-and-VFS).
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```
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This is an example of ESP-IDF console component.
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Type 'help' to get the list of commands.
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Use UP/DOWN arrows to navigate through command history.
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Press TAB when typing command name to auto-complete.
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Your terminal application does not support escape sequences.
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Line editing and history features are disabled.
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On Windows, try using Putty instead.
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esp32>
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```
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## Example Breakdown
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### Configuring UART
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The ``initialize_console()`` function in the example configures some aspects of UART relevant to the operation of the console.
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- **Line Endings**: The default line endings are configured to match those expected/generated by common serial monitor programs, such as `screen`, `minicom`, and the `idf_monitor.py` included in the SDK. The default behavior for these commands are:
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- When 'enter' key is pressed on the keyboard, `CR` (0x13) code is sent to the serial device.
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- To move the cursor to the beginning of the next line, serial device needs to send `CR LF` (0x13 0x10) sequence.
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### Line editing
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The main source file of the example illustrates how to use `linenoise` library, including line completion, hints, and history.
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### Commands
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Several commands are registered using `esp_console_cmd_register()` function. See the `register_wifi()` and `register_system()` functions in `cmd_wifi.c` and `cmd_system.c` files.
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### Command handling
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Main loop inside `app_main()` function illustrates how to use `linenoise` and `esp_console_run()` to implement read/eval loop.
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### Argument parsing
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Several commands implemented in `cmd_wifi.c` and `cmd_system.c` use the Argtable3 library to parse and check the arguments.
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### Command history
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Each time a new command line is obtained from `linenoise`, it is written into history and the history is saved into a file in flash memory. On reset, history is initialized from that file.
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