Chip-cn-dat/Espressif-dat/ESP8266-DAT/ESP8266-HDK-dat/ESP8266-HDK-dat.md
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@@ -76,9 +76,32 @@ The ESP8266EX schematics include seven aspects:
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• External resistor
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• UART
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+## GPIO 16
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+### ❌ What GPIO16 **Cannot** Do
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+
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+| Feature | Support | Notes |
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+|---------------------------|---------|-----------------------------------------------------------------------|
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+| PWM (analogWrite) | ❌ No | GPIO16 does **not support hardware PWM**. |
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+| Interrupts (attachInterrupt) | ❌ No | Cannot be used for interrupts. |
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+| I²C / SPI / UART | ❌ No | Not multiplexed for any peripheral functions. |
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+| Analog input | ❌ No | ESP8266 has only one ADC (ADC0), not on GPIO16. |
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+| Open-drain / Pull-up/down | ❌ No | Limited internal resistor configuration. |
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+| Output during deep sleep | ⚠️ Caution | When used for deep sleep wake, it must not be driven externally. |
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+
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+---
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+
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+### ✅ What GPIO16 **Can** Do
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+
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+| Feature | Support | Notes |
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+|-----------------------|---------|-----------------------------------------------------------------|
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+| Digital output | ✅ Yes | Use with `digitalWrite()`. |
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+| Digital input | ✅ Yes | Use with `digitalRead()`. |
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+| Deep sleep wake | ✅ Yes | Connect GPIO16 to RST to enable timed wake from deep sleep.
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+
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+
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## peripherals
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- [[serial-dat]] - [[LDO-dat]]
Tech-dat/Network-dat/RF-dat/LORA-DAT/lora-hdk-dat/lora-hdk-dat.md
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@@ -17,6 +17,8 @@
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- [[auto-serial-dat]]
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+(NSS_d + SCK + MOSI + MISO) + RESET + BUSY + DIO1 + RXEN + TXEN
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+
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def in UserConfig.h
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//spi
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@@ -32,7 +34,6 @@ def in UserConfig.h
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#define LCC68_MISO_PORT GPIOA
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#define LCC68_MISO_PIN GPIO_PIN_6
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-
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#define LCC68_NRST_PORT GPIOA
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#define LCC68_NRST_PIN GPIO_PIN_3
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