1. Add the missing file, "mma7455l.h"
2. Modify Ethernet DEMO according to the changes of lwIP API in reversion 1668 

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1679 bbd45198-f89e-11dd-88c7-29a3b14d5316

1. Change the usage of the second parameter of Read and Write functions in IIC driver 
   - to "Slave address" from (seldom used) "Offset" 
2. Add a timer for IIC driver to prevent from forever waiting
3. Add digital (IIC) interface support for accelerometer driver (Freescale MMA7455L)

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1669 bbd45198-f89e-11dd-88c7-29a3b14d5316

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1668 bbd45198-f89e-11dd-88c7-29a3b14d5316

based on LS1G DEMO BOARD V1.1

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Modify IIC and USART drivers to avoid compiling error.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1655 bbd45198-f89e-11dd-88c7-29a3b14d5316

1. Add interrupt context check function (context_gcc.S)
2. Add lock (semaphore) for IIC, USART and Ethernet drivers to prevent simultaneously access
3. Add multiple channels support for scan mode of ADC driver
4. Modify miscellaneous drivers according to ADC driver changes
5. Add SWO output enable function (board.c)
6. Disable all interrupts in GPIO interrupt handler (hdl_interrupt.c)
7. Add two Ethernet utility functions (drv_ethernet.c)
8. Add accelerometer driver (analog output)
9. Add accelerometer demo (draft, application.c)

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1653 bbd45198-f89e-11dd-88c7-29a3b14d5316

re-implemented ethernetif and power-on flow of lwip1.4, note:  ethnet driver and init invokings also need to be modified.

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