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expr:functions:func-usb_readdata

usb_readdata()

Reads data from USB device and prints it in the output window.

Syntax

usb_readdata(path);
usb_readdata(path, size);
usb_readdata(path, size, timeout);

Parameters

path USB device path.
size Number of bytes to read. Special values are: (optional)
0 - USB packet size.
-1 - USB packets are read without interruption, data is read until buffer is full.
timeout Timeout value in milliseconds. After time is elapsed, any incoming USB data will not be read. (optional)
Return Value Data size - integer number.

Examples

path = "\\?\hid#vid_045e&pid_028e&ig_00#8&1fa5fd5b&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}";
result = usb_readdata(path, 8, 1000);

result:

8

Output:

0x00, 0x80, 0xFF, 0x7F, 0x00, 0x80, 0xFF, 0x7F
path = "\\?\hid#vid_045e&pid_028e&ig_00#8&1fa5fd5b&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}";
result = usb_readdata(path, 0, 1000);

result:

14

Output:

0x00, 0x80, 0xFF, 0x7F, 0x00, 0x80, 0xFF, 0x7F,0x00, 0x80, 0x00, 0x00, 0x00, 0x00

See also

expr/functions/func-usb_readdata.txt · Last modified: 2023/02/15 12:40 by 127.0.0.1

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