How to send a set of bytes in fwrite or fprintf command?

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Fattah Hanafi
Fattah Hanafi 2012-10-30
Hello
Recently I bought MD49 driver and EMG49 motor. Driver document said:
The commands are sent with a sync byte of 0 at the start and then the command followed by any data bytes. The MD49 will then respond if the command is applicable.
For example to read the battery voltage, send: 0x00 - sync byte 0x26 - READ VOLTS command and the MD49 would respond with 0x18 - returned byte (24 decimal) 24v
But I don't now how to send a set of bytes like that with fwrite or fprintf command.
Thanks

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回答（2 个）

Honglei Chen
Honglei Chen 2012-10-30
Here is an example using sprintf, but fprintf is similar
>> sprintf('0x%02x',24)
ans =
0x18
Walter Roberson
Walter Roberson 2012-10-30
Use hex2dec() or sscanf() to convert the hex representation to numeric representation. fwrite() that.
fwrite(s, uint8(hex2dec('26'))
or
fwrite(s, hex2dec('26'), 'uint8')
or
fwrite(s, sscanf('%x', '26'), 'uint8')
or
fwrite(s, sscanf('%i', '0x26'), 'uint8')

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