How to get a single or double out of a simulink block created with a tlc-file

Dear list,

I created a target for the stm32f4 microcontroller. I have a question about one of the simulink blocks. The block code (and complete target) can be found at http://fwn06.housing.rug.nl/stm32f4_target/stm32f4/blocks/AandD/tlc_c/stmadc1.tlc. The model (adc_float) that I test it with is only this block connected to a scope block, using external mode.

stmadc1 is a simple block that implements getting a value from a ADC. I want the block to return a signal of type SS_SINGLE, as I specify in the .c version. But it seems that values calculated (say 0.0034) are returned as a rounded values (now 0).

The question is, how to get these "float's" visable in the simulation. The tlc-file is not much more than:

%function Outputs(block, system) Output
int adc1_sum;
float adc1_value;

adc1_sum= ((int)Get_ADC_Value(11))*8;
adc1_value = (float) adc1_sum;
printf("fl %f\r\n", adc1_value);

%<LibBlockOutputSignal(0, "", "", 0)> = adc1_value;
%endfunction %%Outputs

Note that I can test the value going to the output signal using the printf; the values a really floats. Looking at the generated code (adc_float.h) I see:

/* Block signals (auto storage) */
typedef struct {                  
  int32_T SFunction1;        /* '<Root>/S-Function1' */
} B_adc_float_T;

And the adc_float.c file gives:

adc1_value = (float) adc1_sum;
printf("fl %f\r\n", adc1_value);
adc_float_B.SFunction1 = adc1_value;

So the type of the output signal values is an int32_T. The question is how do I get that to be a real_T. Note that if I use the timestwo example I DO get a real_T. But I don't see the difference with my block.

Thanks in advance, Sietse