39 lines
978 B
Markdown
39 lines
978 B
Markdown
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## Exercise 05: SD Card Watcher
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This exercise continuously watches SD card presence and prints state-change events.
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Watcher behavior:
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1. Initializes PMU and enables SD power rail (AXP2101 BLDO1).
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2. Polls for card changes with debounced state transitions.
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3. Emits events only on change:
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- `EVENT: card inserted/mounted`
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- `EVENT: card removed/unavailable`
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- `EVENT: no card detected`
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4. On mount event, prints card info and runs SD write workflow.
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5. Every 15 seconds while mounted, runs a periodic write/permission check.
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6. Uses fast preferred probe (`HSPI @ 400k`) and occasional full fallback scan.
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Files used in this exercise:
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- `/Exercise_05_test.txt`
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- `/test/testsub1/testsubsub1/Exercise_05_test.txt`
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## Build
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```bash
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source /home/jlpoole/rnsenv/bin/activate
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pio run -e node_a
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```
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## Upload
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```bash
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source /home/jlpoole/rnsenv/bin/activate
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pio run -e node_a -t upload --upload-port /dev/ttyACM0
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```
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## Monitor
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```bash
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screen /dev/ttyACM0 115200
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```
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