add : USB CDC虚拟串口通讯

4G/tools/_temp/script/temp_script/clib.lua

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+local uartReceiveCallbacks = {}
+local uartSentCallbacks = {}
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+uart.on = function(id, event, callback)
+if event == "receive" then
+uartReceiveCallbacks[id] = callback
+elseif event == "sent" then
+uartSentCallbacks[id] = callback
+end
+end
+
+rtos.on(rtos.MSG_UART_RXDATA, function(id, length)
+if uartReceiveCallbacks[id] then
+uartReceiveCallbacks[id](id, length)
+end
+end)
+
+rtos.on(rtos.MSG_UART_TX_DONE, function(id)
+if uartSentCallbacks[id] then
+uartSentCallbacks[id](id)
+end
+end)