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c3a9821171
This patch updates ESP8266 build system and code base as well.
- Removed unnecessary files.
- Decreased code size.
- Refactored jerry_{port, extapi, run}.c to make it more easy to handle.
- Readme.md is updated as well which contains detailed step by step description about how to set up environment and use JerryScript.
Finally, it solves the related issue #1375.
JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
89 lines
2.1 KiB
Markdown
89 lines
2.1 KiB
Markdown
### About
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Files in this folder (targets/esp8266) are copied from
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`examples/project_template` of `esp_iot_rtos_sdk` and modified for JerryScript.
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You can view online from
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[this](https://github.com/espressif/esp_iot_rtos_sdk/tree/master/examples/project_template) page.
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### How to build JerryScript for ESP8266
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#### 1. SDK
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Follow [this](./docs/ESP-PREREQUISITES.md) page to setup build environment
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#### 2. Building JerryScript
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```
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# assume you are in jerryscript folder
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make -f ./targets/esp8266/Makefile.esp8266
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```
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Output files should be placed at $BIN_PATH
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#### 3. Flashing for ESP8266 12E
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Follow
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[this](http://www.kloppenborg.net/images/blog/esp8266/esp8266-esp12e-specs.pdf) page to get details about this board.
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```
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make -f ./targets/esp8266/Makefile.esp8266 flash
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```
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Default USB device is `/dev/ttyUSB0`. If you have different one, give with `USBDEVICE`, like;
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```
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USBDEVICE=/dev/ttyUSB1 make -f ./targets/esp8266/Makefile.esp8266 flash
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```
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### 4. Running
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* power off
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* connect GPIO2 with serial of 470 Ohm + LED and to GND
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* power On
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LED should blink on and off every second
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#### 5. Cleaning
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To clean the build result:
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```
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make -f ./targets/esp8266/Makefile.esp8266 clean
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```
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To clean the board's flash memory:
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```
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make -f ./targets/esp8266/Makefile.esp8266 erase_flash
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```
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### 6. Optimizing initial RAM usage (ESP8266 specific)
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The existing open source gcc compiler with Xtensa support stores const(ants) in
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the same limited RAM where our code needs to run.
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It is possible to force the compiler to store a constant into ROM and also read it from there thus saving RAM.
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The only requirement is to add `JERRY_CONST_DATA` attribute to your constant.
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For example:
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```C
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static const lit_magic_size_t lit_magic_string_sizes[] =
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```
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can be modified to
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```C
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static const lit_magic_size_t lit_magic_string_sizes[] JERRY_CONST_DATA =
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```
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That is already done to some constants in jerry-core. E.g.:
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- vm_decode_table
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- ecma_property_hashmap_steps
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- lit_magic_string_sizes
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- unicode_letter_interv_sps
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- unicode_letter_interv_len
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- unicode_non_letter_ident_
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- unicode_letter_chars
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