update porting readme

port/ch32/README.md

@@ -0,0 +1,12 @@
+# Note
+
+## Support Chip List
+
+- CH32F10x、CH32V10x
+
+## Before Use
+
+Your should implement `usb_dc_low_level_init` and `usb_dc_low_level_deinit`.
+- Enable or disable USB clock and set USB clock for 48M.
+- Enable or disable gpio and gpio clk for usb dp and dm.
+- Enable or disable usb irq

port/fsdev/README.md

@@ -1,4 +1,6 @@
-# Support Chip List
+# Note
+
+## Support Chip List
 
 ## STM32
 
@@ -28,4 +30,12 @@
 
 ## CH32
 
-- CH32F10x、CH32V10x
+- CH32F10x、CH32V10x
+
+
+## Before Use
+
+Your should implement `usb_dc_low_level_init` and `usb_dc_low_level_deinit`.
+- Enable or disable USB clock and set USB clock for 48M.
+- Enable or disable gpio and gpio clk for usb dp and dm.
+- Enable or disable usb irq

port/mm32/README.md

@@ -0,0 +1,14 @@
+# Note
+
+## Support Chip List
+
+- MM32F10x
+- MM32FL0xx
+- MM32FL3xx
+
+## Before Use
+
+Your should implement `usb_dc_low_level_init` and `usb_dc_low_level_deinit`.
+- Enable or disable USB clock and set USB clock for 48M.
+- Enable or disable gpio and gpio clk for usb dp and dm.
+- Enable or disable usb irq

port/synopsys/README.md

@@ -1,4 +1,6 @@
-# Support Chip List
+# Note
+
+## Support Chip List
 
 ## STM32
 
@@ -22,4 +24,11 @@
 
 ## HC32
 
-- HC32F4A0
+- HC32F4A0
+
+## Before Use
+
+Your should implement `usb_dc_low_level_init` and `usb_dc_low_level_deinit`.
+- Enable or disable USB clock and set USB clock for 48M.
+- Enable or disable gpio and gpio clk for usb dp and dm.
+- Enable or disable usb irq