I am using stm32f030RC controller,for my application need to print the float values on the hyperterminal.Printf is working fine for text,charters & interger values.i am using stm32cubemx generated code & atollic true studio .
Here is code what i done for printf:
int _write(int32_t file, uint8_t *ptr, int32_t len)
/* Implement your write code here, this is used by puts and printf for example */
after googling tried to change the build settings but it was not worked for me.