FreeRTOS-Unable to print temperature on LCD

[NaMa_4430341]

Hi,

I am using PSoC 5LP., trying to display temperature using freertos by creating two tasks. one to read and calculate temp and other to print on lcd. the lcd is not displaying temperature. I don't understand what is the problem. Please help me. The temperature is displayed like in the picture. Please see my code for your reference

Thank you!

[MotooTanaka · Accepted solution]

Hi,

I think that floating point format is not working.

Perhaps, you need do one of following two.

Note: I prefer (2) though.

(1) Flag to use float print

(2) Use "%d" instead of "%f"

(1) Flag to use float print

(1.1) From Menu  Project > Building Sttings

(1.2) In the Build Settings Dialog

ARM GCC ... > Linker > General > Use newlib-nano Float Fromatting

Default : False

Change is to True

(1.3) To use Floating format you may need to expand Stack Size and Heap Size

in the DWR  System

(2) Change sprintf format using "%d" instead of "%f"

From

                 sprintf(str,"#T: %.2fC\r\n",curr_temp);

to

                 sprintf(str, "#T:%d.%02dC\r\n", (int)curr_temp, (int) (100 * curr_temp)%100) ;

or

         if (curr_temp < 0.0) {

               curr_temp *= -1.0 ;

               sprintf(str, "#T:-%d.%02dC\r\n", (int)curr_temp, (int) (100 * curr_temp)%100) ;

          } else {

                 sprintf(str, "#T:%d.%02dC\r\n", (int)curr_temp, (int) (100 * curr_temp)%100) ;

         }

moto