103 lines
4.2 KiB
Markdown
103 lines
4.2 KiB
Markdown
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# Rust M5Stack Lvgl Demo
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The purpose of this demo is to get lv-binding-rust (Lvgl) running on the M5Stack development board
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## Development Board
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M5Stack Basic Development Kit V1.0 with 16M Flash
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## Overview
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This application shows how to use lv-binding-rust crate on the M5Stack. The program displays a clock time on a blue backgound screen.
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The clock time is a simulated time of 21:00 to 21::59 where the seconds are incremented each second and repeats the 00-59 seconds forever.
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## partition-table folder
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The partition-table folder contains a file called partitons.csv. This file increases the default factory/app partiton from the default of 1M to 3M. This allows us more space for our program and since the flash size is 16M this should not be a problem. This file will be called when we flash the device.
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## custom-fonts folder
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The custom-fonts folder contains our custom fonts. The customs fonts are converted from TTF fonts using lvgl online font converter at https://lvgl.io/tools/fontconverter. I used https://ttfonts.net to find a font I liked and then downloaded the font. In the lvgl-online-font-converter I used the font name plus the font size for the name of the font. I chose Bpp of 2 bit-per-pixel and set the range of 0x30-0x3A since I only need numbers and the ":" character. After clicking on "Convert" the file will be downloaded. I placed this downloaded file (*.c) into the custom-fonts folder. Then I created a header file which has an extern to my *.c file, along with changing the ifndef and define names.
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To use this custom font, I added ```LVGL_FONTS_DIR = {relative = true, value = "custom-fonts"}``` to my config.toml under [env]. This allows our font to be compiled when lvgl is compiled.
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## lvgl-configs folder
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The lvgl-configs folder holds the lv_config.h and lv_drv_conf.h files which are required by lvgl to compile. Everything in lv_drv_conf.h file is set to 0 as I am not using the lvgl drivers. I don't think I changed anything in the lv_conf.h file.
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## Cargo.toml project file
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I added the following to the "dependencies" section.
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```
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esp-idf-hal = { version = "0.42.5" }
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esp-idf-sys = { version = "0.33.7" }
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cstr_core = "0.2.1"
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embedded-graphics-core = "0.4.0"
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lvgl = { version = "0.6.2", default-features = false, features = [
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"embedded_graphics",
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"unsafe_no_autoinit",
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] }
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lvgl-sys = { version = "0.6.2" }
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display-interface-spi = "0.4.1"
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mipidsi = "0.7.1"
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```
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I also included patch.crates-io section to patch lvgl and lvgl-sys
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```
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[patch.crates-io]
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lvgl = { git = "https://github.com/enelson1001/lv_binding_rust"}
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lvgl-sys = { git = "https://github.com/enelson1001/lv_binding_rust"}
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```
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## config.toml
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To get lv-bindings-rust to comple and build I made the following changes to the config.toml file.
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```
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[build]
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target = "xtensa-esp32-espidf"
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[target.xtensa-esp32-espidf]
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linker = "ldproxy"
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# runner = "espflash --monitor" # Select this runner for espflash v1.x.x
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runner = "espflash flash --monitor" # Select this runner for espflash v2.x.x
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rustflags = [
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# Extending time_t for ESP IDF 5: https://github.com/esp-rs/rust/issues/110
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"--cfg",
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"espidf_time64",
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# Added the following 2 entries so lvgl will build without getting string.h file not found
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"--sysroot",
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"/home/ed/.rustup/toolchains/esp/xtensa-esp32s3-elf/esp-13.2.0_20230928/xtensa-esp-elf/xtensa-esp-elf/include",
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]
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[unstable]
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build-std = ["std", "panic_abort"]
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[env]
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MCU = "esp32"
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# Note: this variable is not used by the pio builder (`cargo build --features pio`)
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ESP_IDF_VERSION = "v5.1.1"
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# The directory that has the lvgl config files - lv_conf.h, lv_drv_conf.h
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DEP_LV_CONFIG_PATH = { relative = true, value = "lvgl-configs" }
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# Required to make lvgl build correctly otherwise get wrong file type
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CROSS_COMPILE = "xtensa-esp32-elf"
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# Directory for custom fonts (written in C) that Lvgl can use
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LVGL_FONTS_DIR = {relative = true, value = "custom-fonts"}
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```
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## lv-binding-rust fork
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I updated my fork of lv-binding-rust to include PR153 ie the changes recommended by madwizard-thomas.
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## Flashing the M5Stack
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I used the following command to flash the M5Stack.
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```
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$ cargo espflash flash --partition-table=partition-table/partitions.csv --monitor
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```
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## Picture of M5stack running the demo
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# Versions
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### v1.0 :
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- initial release
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