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11 RT-Thread provides a set of I/O device framework, as shown in the following figure. It is located b…
21 The device driver layer is a set of programs that drive the hardware devices to work, enabling acce…
23 * The device driver creates a device instance with hardware access capabilities based on the device…
30 * The watchdog device driver creates a watchdog device instance with hardware access capability bas…
40 …a kind of objects and is included in the scope of the object manager. Each device object is derive…
90 …ansfers, that is, data usually transfers in the form of serial, one byte at a time. Character devi…
92 A block device transfers one data block at a time, for example 512 bytes data at a time. This data …
96 …a write operation with a large amount of data, the device driver must first divide the data into m…
100 …istering them in the I/O Device Manager. You can create device instances in a statically declared …
114 When this interface is called, the system allocates a device control block from the dynamic heap me…
136 …e is opended, and the count will subtract 1 when the device is closed, and a real shutdown operat…
137 …hould return the 10th block in the device (starting from the 0th block) for a total of 2 blocks of…
141 When a dynamically created device is no longer needed, it can be destroyed using the following func…
184 … used to output a character string to the serial terminal: when the output character is `\n` , it …
212 The following code is an example of registering a watchdog device. After calling the `rt_hw_watchd…
242 /* register a character device */
284 >When a device has been successfully initialized, calling this interface will not repeat initializa…
334 >Device interfaces `rt_device_open()` and `rt_device_close()` need to used in pairs. Open a device…
380 | Actual Size of the Data Read | If it is a character device, the return size is in bytes. If it is…
398 | Actual Size of the Data Written | If it is a character device, the return size is in bytes. If it…
420 …a callback function. This callback function is called after the bottom hardware data has been sent…
433 …er calls back the function and passes the sent data block address buffer as a parameter to the upp…
437 The following code is an example of accessing a device. First, find the watchdog device through the…