uint32 array to float32 array, in place

Question

I am working in a space limited environment. I collect an array of unsigned 32 bit ints via DMA, but I need to work on them as single precision floats using DSP extensions in the MCU. Copying the array is not possible - it takes up almost all existing SRAM. Is there a neat way to do this?

[Note] The data values are only 12 bits so out of range problems will not exist

"Copying the array is not possible - it takes up almost all existing SRAM" what? you MCU has only 4 bytes of RAM? — phuclv
– phuclv, Commented Sep 10, 2014 at 10:16
I mean that the array is 16KB and the total space remaining is around 4KB — user611089
– user611089, Commented Sep 10, 2014 at 10:19

Paul R · Accepted Answer · 2014-09-10 07:51:06Z

3

You can just do it like this:

uint32_t a[N];

float *f = (float *)a;

for (i = 0; i < N; ++i)
{
    f[i] = (float)a[i];
}

Note that this breaks strict aliasing rules so you should compile with -fno-strict-aliasing or equivalent.

answered Sep 10, 2014 at 7:51

Paul R

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1 Comment

phuclv Over a year ago

ahh he means to convert the uint32 value to float32 right? I though that he wants to convert the float value from raw binary in uint32

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