feat(demo): add esp32-no-std demo example

Author: orhun

.github/workflows/ci.yml

@@ -18,7 +18,6 @@ env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
 jobs:
-
   typos:
     name: Check for typos
     runs-on: ubuntu-latest
@@ -33,8 +32,8 @@ jobs:
       - uses: actions/checkout@v6
       - uses: DavidAnson/markdownlint-cli2-action@v22
         with:
-          globs: '**/*.md,#CHANGELOG.md'
-          separator: ','
+          globs: "**/*.md,#CHANGELOG.md"
+          separator: ","
 
   fmt:
     name: Run fmt
@@ -70,7 +69,12 @@ jobs:
             dir: examples/mousefood-esp32-std-demo
             target: xtensa-esp32-espidf
             setup_xtensa: true
-          # EPD Waveshare demo 
+          # no-std demo
+          - name: esp32-no-std-demo
+            dir: examples/esp32-no-std-demo
+            target: ""
+            setup_xtensa: true
+          # EPD Waveshare demo
           - name: epd-waveshare-demo
             dir: examples/epd-waveshare-demo
             target: ""

Cargo.lock

@@ -0,0 +1,12 @@
+[target.xtensa-esp32-none-elf]
+runner = "espflash flash --monitor --chip esp32"
+
+[env]
+ESP_LOG = "trace"
+
+[build]
+target = "xtensa-esp32-none-elf"
+rustflags = ["-C", "link-arg=-nostartfiles"]
+
+[unstable]
+build-std = ["alloc", "core"]

examples/esp32-no-std-demo/.cargo/config.toml

@@ -0,0 +1 @@
+stack-size-threshold = 8192