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device/pipe: add a control cmd to get the space left in pipe

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Grissiom
2013-10-23 01:43:18 +08:00
parent ac5da68db7
commit 0feefc03b6
2 changed files with 4 additions and 0 deletions
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components/drivers/src/pipe.c
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@@ -190,6 +190,8 @@ static rt_size_t rt_pipe_write(rt_device_t dev,
static rt_err_t rt_pipe_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{
if (cmd == PIPE_CTRL_GET_SPACE && args)
*(rt_size_t*)args = rt_ringbuffer_space_len(&PIPE_DEVICE(dev)->ringbuffer);
return RT_EOK;
}