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

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

Answer 1

[Honglei Chen]

Here is an example using sprintf, but fprintf is similar

>> sprintf('0x%02x',24)

ans =

0x18

Answer 2

[Walter Roberson]

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')