Using floats with sprintf() in embedded C

Question

Guys, I want to know if float variables can be used in sprintf() function.

Like, if we write:

sprintf(str,\"adc_read = %d \         


        

Answer 1

Similar to paxdiablo above. This code, inserted in a wider app, works fine with STM32 NUCLEO-F446RE.

#include 
#include 
#include 
void IntegFract(char *pcIntegStr, char *pcFractStr, double dbValue, int iPrecis);

main()
{
   char acIntegStr[9], acFractStr[9], char counter_buff[30];
   double seconds_passed = 123.0567;
   IntegFract(acIntegStr, acFractStr, seconds_passed, 3);
   sprintf(counter_buff, "Time: %s.%s Sec", acIntegStr, acFractStr);
}

void IntegFract(char *pcIntegStr, char *pcFractStr, double dbValue, int 
iPrecis)
{
    int iIntegValue = dbValue;
    int iFractValue = (dbValue - iIntegValue) * pow(10, iPrecis);
    itoa(iIntegValue, pcIntegStr, 10);
    itoa(iFractValue, pcFractStr, 10);
    size_t length = strlen(pcFractStr);
    char acTemp[9] = "";
    while (length < iPrecis)
    {
        strcat(acTemp, "0");
        length++;
    }
    strcat(acTemp, pcFractStr);
    strcpy(pcFractStr, acTemp);
}

counter_buff would contain 123.056 .