How to use the for loop in a simple sequence with STM32H7 in a SPI transmission?

[ABlum.2]

Hello everyone,

I am trying to replace a simple code in C inside a STM32H7 that goes like this:

function(0, &array[0]);
 
function(1, &array[1]);
 
function(2, &array[2]);
 
function(3, &array[3]);
 
function(4, &array[4]);

with

enum_variable_t index ;
 
for(index = FIRST_ENUM ; index < LAST_ENUM; index ++)
 
{
 
      function((uint16_t)index , &array[index]);
 
}

However, some data is corrupted due to this simple change, I thought it might be an optimization problem but I can't solve it by including the (-O) flag. Any advice would be of great help.

Regards

Alan

[CPINA]

Hello,

Does your SPI is master in transmission ?

Br,

[ABlum.2]

Yes it is

[TDK]

What data is corrupted? There's nothing wrong with the code you posted, assuming FIRST_ENUM=0 and LAST_ENUM=5.

[CPINA]

And when you say data is corrupted, it means that all the next data are wrong or are they any recovery ? Is data shifted by some bits ?

[ABlum.2]

Hi @CPINA​ ,

When I read the values in array[0] without the for loop, I get these values (which are correct)

 

But when I replace the code with the for loop (nothing else changes) I get this data.

[ABlum.2]

The blue line represent array[0]

[ABlum.2]

Hi @TDK​

I explained in the topic avode what I mean with corrupted data.

Regards

Alan

[CPINA]

Not sure to understand, for both blue line is your array[0) ? I was thinking it was the yellow one. what is supposed to be the data linked to array[0].

If the data line is supposed to be the blue one, it seems it is even not a data, looks like noise. Did you check that the SPI is well configured in debug just before writing the data into the data register ? Please confirm to me, you are master transmitter in such case ? If yes can you see the SPI going out after writing the Data register of the SPI ?

[ABlum.2]

Hello @CPINA​ 

After restarting my computer today morning it seems that the problem solves itself and now works without the error, some kind of magic I guess.

Regards

Alan