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--- products:sbc:edge2:applications:gpio:uart [2022/12/02 01:41]
ivan
+++ products:sbc:edge2:applications:gpio:uart [2022/12/02 02:23]
ivan [UART]
@@ Line 4: / Line 4: @@
+===== Introduction =====
+This page introduces the usage of hardware UART on [[products:sbc:edge2:applications:gpio:40pin-header|16-pin Header]].
+<WRAP important >
+For Edge2, in order to use the UART , you need to attach the IO extension board.
+</WRAP>
+===== UART Information =====
+|           ^  UART       ^ PIN      ^ GPIO Name  ^ GPIO Number  ^  DT Overlays Node  ^  Device Node  ^
+^  Edge2    |  UART7      |  12(TX)  |  GPIO3_C0  |  112         |  edge2-io-uart     |  /dev/ttyS7   |
+| :::       | :::         |  14(RX)  |  GPIO3_C1  |  113         | :::                | :::           |
+===== Enable UART =====
+In order to use the UART, you need to enable the UART function via [[products:sbc:common:configurations:device-tree-overlay|Device Tree Overlay]].
+Edit ''/boot/dtb/rockchip/rk3588s-khadas-edge2.dtb.overlay.env'' to add uart node to ''fdt_overlays'' node if it doesn't exist.
+e.g. Enable ''UART7'', you need to add ''edge2-io-uart'' to node ''fdt_overlays'' if it doesn't exist.
+```shell
+fdt_overlays=edge2-io-uart
+```
+After reboot, you will see the UART device node.
+```shell
+$ ls /dev/ttyS7
+/dev/ttyS7
+```
+===== Disable UART to Use GPIO =====
+If you want to use normal GPIO instead of UART, you can remove the UART node in [[products:sbc:common:configurations:device-tree-overlay|Device Tree Overlay]].

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