update porting readme

2021-12-12 21:49:03 +08:00
parent 0d208f350e
commit 0dd1c3b3fb
4 changed files with 49 additions and 4 deletions
--- a/port/fsdev/README.md
+++ b/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