#include <rtthread.h>
#include <stdio.h>
int main(void)
{
    float test_f = 0.0;
    char test_str[50];
    rt_memset(test_str,0,50);
    while (1)
    {
        test_f = test_f+0.5;
        sprintf(test_str,"%.2f",test_f);
        rt_kprintf("float data: %s\r\n",test_str);
        rt_thread_mdelay(1000);
    }
    return 0;
}

#include <rtthread.h>
#include <stdio.h>
int main(void)
{
    char sprintf_buf[128];
    float test_data = 1000.66666666f;
    while(1)
    {
        snprintf(sprintf_buf,sizeof(sprintf_buf), "%f\n", test_data);
        rt_kprintf(sprintf_buf);
        rt_thread_mdelay(500);
        //rt_kprintf("%f\r\n",test_data);
        //rt_kprintf("i am fine .\r\n");
        //test_data += test_data;
    }
}

static void led_thread_entry(void *parameter)
{
    char sprintf_buf[128];
    static float test_data = 1000.66666666f;
    while(1)
    {
        HAL_GPIO_WritePin(USER_LED_PA5_GPIO_Port,USER_LED_PA5_Pin, GPIO_PIN_SET);
        rt_thread_mdelay(500);
        HAL_GPIO_WritePin(USER_LED_PA5_GPIO_Port,USER_LED_PA5_Pin, GPIO_PIN_RESET);
        rt_thread_mdelay(500);
        snprintf(sprintf_buf,sizeof(sprintf_buf), "%f\n", test_data);
        rt_kprintf(sprintf_buf);
        //rt_kprintf("%f\r\n",test_data);
        //rt_kprintf("i am fine .\r\n");
        test_data += test_data;
    }
}

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- RT -     Thread Operating System
 / | \     3.1.3 build Jul  5 2020
 2006 - 2019 Copyright by rt-thread team
msh >1000.666687