fwrite int64 not supported
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Hi to you all,
I'm using matlab to exchange data with a cortex M4 board.
In my embedded c code I enabled the usb vcom and I am able to write and read using
fwrite()
fread()
Everything is fine if I use 'int32' as precision, but 'int64' is not supported.
Unfortunately I need to send to my board some int64 parameters and I wonder which is the best way of doind this.
Any hints?
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回答 (1 件)
Guillaume
2019 年 6 月 28 日
Well, a 64 bit integer can be easily split into two 32-bit halves. You'd need to know the endianess of your environment but it's going to be either:
%input:
% val64: a uint64 integer scalar
val64as32 = typecast(val64, 'uint32');
fwrite(something, val64as32, 'uint32')
or
%input:
% val64: a uint64 integer scalar
val64as32 = fliplr(typecast(val64, 'uint32'));
fwrite(something, val64as32, 'uint32')
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