32 lines
1.4 KiB
Markdown
32 lines
1.4 KiB
Markdown
# Exercise 16: PSRAM
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This exercise demonstrates usage of PSRAM (Pseudo SRAM) on an ESP32-S3 board, alongside regular RAM metrics.
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Behavior:
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- Reports heap and PSRAM statistics every second over serial.
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- Shows live heap and PSRAM status on the OLED display (both on same line).
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- Allows you to write/append/read/clear data in a PSRAM-backed buffer (up to ~2MB).
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- Designed as an extension of Exercise 15_RAM to explore larger volatile storage.
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Note: the exercise now targets a PSRAM-enabled ESP32-S3 board definition (`freenove_esp32_s3_wroom`). This board profile has 8MB flash + 8MB PSRAM, matching the T-Beam Supreme specifications. If your hardware differs, adjust accordingly.
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Sources:
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- LilyGo T-Beam SUPREME datasheet/wiki: https://wiki.lilygo.cc/get_started/en/LoRa_GPS/T-Beam-SUPREME/T-Beam-SUPREME.html
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- PlatformIO board definition: https://docs.platformio.org/page/boards/espressif32/freenove_esp32_s3_wroom.html
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- Local PlatformIO board metadata: ~/.platformio/platforms/espressif32/boards/freenove_esp32_s3_wroom.json
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Build and upload:
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```bash
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cd /usr/local/src/microreticulum/microReticulumTbeam/exercises/16_PSRAM
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pio run -e amy -t upload
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pio device monitor -b 115200
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```
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Commands:
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- `help` - show command menu
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- `stat` - show PSRAM buffer state
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- `read` - read PSRAM buffer contents
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- `clear` - clear PSRAM buffer
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- `write <text>` - write text to PSRAM buffer
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- `append <text>` - append text to PSRAM buffer
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