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[BSP] change the type of cmd.
1. Change the type of cmd to 'int'; 2. Remove RT_LWIP_USING_RT_MEM macro;
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@@ -216,7 +216,7 @@ static rt_size_t rt_serial_write (rt_device_t dev, rt_off_t pos, const void* buf
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return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
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}
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static rt_err_t rt_serial_control (rt_device_t dev, rt_uint8_t cmd, void *args)
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static rt_err_t rt_serial_control (rt_device_t dev, int cmd, void *args)
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{
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RT_ASSERT(dev != RT_NULL);
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