43 lines
784 B
Markdown
43 lines
784 B
Markdown
## Exercise 06: RTC Check (PCF8563)
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This exercise validates RTC read/write and power-off persistence on the T-Beam Supreme.
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It:
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- Initializes PMU + I2C bus used by RTC.
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- Reads RTC at startup.
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- Prints RTC every 10 seconds.
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- Accepts serial commands:
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- `show`
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- `set YYYY-MM-DD HH:MM:SS`
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- `help`
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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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## Suggested Persistence Test
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1. Set the RTC:
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- `set 2026-02-14 17:30:00`
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2. Confirm:
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- `show`
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3. Power off the unit for a few minutes.
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4. Power on and run:
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- `show`
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5. Compare expected elapsed time vs RTC output.
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