Hmmmm... I´m also just learning this c-stuff ;) Mostly i use examples from elsewhere (Youtube, provided ST examples, communities...) and adapt them to my needs =) Did i mention ? I really HATE arrays :beaming_face_with_smiling_eyes:
But anyway: I just checked one of my working examples, where i read some ADC values, triggered by interrupt into an array. This array is declared in the according source file as " uint16_t ADC_Converted_Values[10] = {0}; ". I´m a little bit surprised, but i even didn´t take care, if i can use it in another task (via extern uint16_t xxxxxx) and it seems to work without queue (as i said: I´m also learning that stuff, especially with freeRTOS...)...
Ok, my ADC puts the values (10) into that array... That´s, what your snprintf should do... Later, when it comes to read the array somewhere, it looks different:
void use_myArray()
{
uint32_t sum = 0;
for ( int i = 0; i < 10; i++ ) //one pass for every variable in the array
{
sum += ADC_Converted_Values[i] // <- "i" indicates, WHICH of the 10 variables in the array to read
}
here_i_call_another_function(sum/10); //Just to get an average of all these 10 values
}
In your function, it copies the temp_value into another int and then, you try to write it via snprintf into your array (str_tmp[100])... I´m not very used to "snprintf", but it seems, that in this case you write exactly one time one int (int tmp) into always the 1st place of your array ( which would be [0] ). The rest of your array is just "not even initialized, so absolutely unpredictable" junk. And that´s, what you send via UART ...
As i said: I´m also just learning that stuff, but that´s, what i would expect, when reading the code =) I would be glad, if somebody corrects me, if i´m wrong =)
/Charly
oh.. and before i forget that: a char array is [xx] times the size of a char (which is 8 bits). An "int" is regularly 16 or 32 bits long (depending on the platform etc.) ... So maybe, you should declare the array with the type, your sensor returns and write them directly into the array without the use of "int tmp" ?
