本文整理汇总了C++中rt_device_t::open方法的典型用法代码示例。如果您正苦于以下问题：C++ rt_device_t::open方法的具体用法？C++ rt_device_t::open怎么用？C++ rt_device_t::open使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类rt_device_t的用法示例。
在下文中一共展示了rt_device_t::open方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: rt_device_open
/**
* This function will open a device
*
* @param dev the pointer of device driver structure
* @param oflag the flags for device open
*
* @return the result
*/
rt_err_t rt_device_open(rt_device_t dev, rt_uint16_t oflag)
{
rt_err_t result = RT_EOK;
RT_ASSERT(dev != RT_NULL);
/* if device is not initialized, initialize it. */
if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
{
if (dev->init != RT_NULL)
{
result = dev->init(dev);
if (result != RT_EOK)
{
rt_kprintf("To initialize device:%s failed. The error code is %d\n",
dev->parent.name, result);
return result;
}
}
dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
}
/* device is a stand alone device and opened */
if ((dev->flag & RT_DEVICE_FLAG_STANDALONE) &&
(dev->open_flag & RT_DEVICE_OFLAG_OPEN))
{
return -RT_EBUSY;
}
/* call device open interface */
if (dev->open != RT_NULL)
{
result = dev->open(dev, oflag);
}
/* set open flag */
if (result == RT_EOK || result == -RT_ENOSYS)
{
dev->open_flag = oflag | RT_DEVICE_OFLAG_OPEN;
dev->ref_count++;
/* don't let bad things happen silently. If you are bitten by this assert,
* please set the ref_count to a bigger type. */
RT_ASSERT(dev->ref_count != 0);
}
return result;
}示例2: _block_device_test
static rt_err_t _block_device_test(rt_device_t device)
{
rt_err_t result;
struct rt_device_blk_geometry geometry;
rt_uint8_t * read_buffer = RT_NULL;
rt_uint8_t * write_buffer = RT_NULL;
rt_kprintf("\r\n");
if( (device->flag & RT_DEVICE_FLAG_RDWR) == RT_DEVICE_FLAG_RDWR )
{
// device can read and write.
// step 1: open device
result = device->open(device,RT_DEVICE_FLAG_RDWR);
if( result == RT_EOK )
{
device->open_flag |= RT_DEVICE_OFLAG_RDWR | RT_DEVICE_OFLAG_OPEN;
}
else
{
return result;
}
// step 2: get device info
rt_memset(&geometry, 0, sizeof(geometry));
result = rt_device_control(device, RT_DEVICE_CTRL_BLK_GETGEOME, &geometry);
if( result != RT_EOK )
{
rt_kprintf("device : %s cmd RT_DEVICE_CTRL_BLK_GETGEOME failed.\r\n");
return result;
}
rt_kprintf("device info:\r\n");
rt_kprintf("sector size : %d byte\r\n",geometry.bytes_per_sector);
rt_kprintf("sector count : %d \r\n",geometry.sector_count);
rt_kprintf("block size : %d byte\r\n",geometry.block_size);
rt_kprintf("\r\n");
read_buffer = rt_malloc(geometry.bytes_per_sector);
if( read_buffer == RT_NULL )
{
rt_kprintf("no memory for read_buffer!\r\n");
goto __return;
}
write_buffer = rt_malloc(geometry.bytes_per_sector);
if( write_buffer == RT_NULL )
{
rt_kprintf("no memory for write_buffer!\r\n");
goto __return;
}
//step 3: I/O R/W test
{
rt_uint32_t i,err_count,sector_no;
rt_uint8_t * data_point;
// the first sector
sector_no = 0;
data_point = write_buffer;
*data_point++ = (rt_uint8_t)sector_no;
for(i=1; i<geometry.bytes_per_sector; i++)
{
*data_point++ = (rt_uint8_t)i;
}
i = device->write(device,sector_no,write_buffer,1);
if( i != 1 )
{
rt_kprintf("write device :%s ",device->parent.name);
rt_kprintf("the first sector failed.\r\n");
goto __return;
}
i = device->read(device,sector_no,read_buffer,1);
if( i != 1 )
{
rt_kprintf("read device :%s ",device->parent.name);
rt_kprintf("the first sector failed.\r\n");
goto __return;
}
err_count = 0;
data_point = read_buffer;
if( (*data_point++) != (rt_uint8_t)sector_no)
{
err_count++;
}
for(i=1; i<geometry.bytes_per_sector; i++)
{
if( (*data_point++) != (rt_uint8_t)i )
{
err_count++;
}
}
if( err_count > 0 )
{
rt_kprintf("verify device :%s ",device->parent.name);
rt_kprintf("the first sector failed.\r\n");
goto __return;
}
// the second sector
sector_no = 1;
data_point = write_buffer;
*data_point++ = (rt_uint8_t)sector_no;
//.........这里部分代码省略.........