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1. Change 'rt_uint8_t' type of cmd to 'int';
2. Add waitqueue;
3. Split device ipc header files;
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OXape reports: http://www.rt-thread.org/phpBB3/topic3939.html
driver/ringbuffer: when data length is bigger than space length
for rb, the read_index in rb is not update.
When length > space, update the read_index, the bug can be fix, and
works fine.
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Add the APIs that will discard the old data when rb is full.
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RT_RINGBUFFER_SIZE could mean "the size of the whole buffer", "the size
of the empty space" or "the size of the data". Moreover, it's never a
micro anymore. Change it to rt_ringbuffer_data_len before it's too late.
Also, RT_RINGBUFFER_EMPTY is changed to rt_ringbuffer_space_len.
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The new implementation use the mirroring method to distinguish full
buffer and the empty buffer. It also support buffers of arbitrary size.
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2529 bbd45198-f89e-11dd-88c7-29a3b14d5316
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2431 bbd45198-f89e-11dd-88c7-29a3b14d5316
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2384 bbd45198-f89e-11dd-88c7-29a3b14d5316
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2314 bbd45198-f89e-11dd-88c7-29a3b14d5316
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the available data of ring buffer.
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2313 bbd45198-f89e-11dd-88c7-29a3b14d5316
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2199 bbd45198-f89e-11dd-88c7-29a3b14d5316
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2098 bbd45198-f89e-11dd-88c7-29a3b14d5316
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