5 rt_thread_create创建线程返回值RT_NULL

Charge_Bat_Task_ptr = rt_thread_create(    "Charge_Bat_Task",
                    Charge_Bat_Task_Entry,
                    RT_NULL,
                    512,
                    5,
                    10);

//main.c
int main(void)
{    
    interrupt_config();
//    gd_eval_led_init(LED1);
//    ledTaskInit();
//    flex_button_main();
    Gpio_Charge_Bat_init();        
    Charge_Bat_Task_init();
    while(1)
    {
        gd_eval_led_toggle(LED1);
        rt_thread_mdelay(1000);
    }
}
//Charge_BatManagemengt.c
#include "Charge_BatManagemengt.h"
#include <rtthread.h>
#include "gd32f350r_eval.h"
uint8_t DownloadFlag = 0;
void Gpio_Charge_Bat_init(void)
{
    gpio_mode_set(DebugRight_CHGR_GPIO, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, DebugRight_CHGR_PIN);
    gpio_mode_set(DebugLeft_FULL_GPIO, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, DebugLeft_FULL_PIN);
    DownloadFlag = 0;
}
void Gpio_Set_Download_init(void)
{
    gpio_mode_set(DebugRight_CHGR_GPIO, GPIO_MODE_AF, GPIO_PUPD_NONE, DebugRight_CHGR_PIN);
    gpio_mode_set(DebugLeft_FULL_GPIO, GPIO_MODE_AF, GPIO_PUPD_NONE, DebugLeft_FULL_PIN);
    gpio_af_set(DebugRight_CHGR_GPIO, GPIO_AF_0, DebugRight_CHGR_PIN);
    gpio_af_set(DebugLeft_FULL_GPIO, GPIO_AF_0, DebugLeft_FULL_PIN);
    DownloadFlag = 1;
}
void Charge_Bat_Task_Entry(void *p)
{
    rt_err_t result;
    rt_uint8_t IsChargeFlag;
    while(1)
    {
        rt_thread_mdelay(1);
        rt_kprintf("Charging:%d\n",Charging);
        if(Charging)
        {
            IsChargeFlag = 1;
            result = rt_mq_send(&mq_Charge, &IsChargeFlag, 1);
            if (result != RT_EOK)
            {
                rt_kprintf("rt_mq_send ERR_1\n");
            }
        }
        else
        {
            IsChargeFlag = 0;
            result = rt_mq_send(&mq_Charge, &IsChargeFlag, 1);
            if (result != RT_EOK)
            {
                rt_kprintf("rt_mq_send ERR_2\n");
            }
        }
    }
}
void Charge_Bat_Task_init(void)
{
    rt_thread_t Charge_Bat_Task_ptr;
    rt_err_t result;
        //创建线程
        Charge_Bat_Task_ptr = rt_thread_create(    "Charge_Bat_Task",
                                                Charge_Bat_Task_Entry,
                                                RT_NULL,
                                                512,
                                                5,
                                                10);
        rt_kprintf("prt:%0x\n",Charge_Bat_Task_ptr);
        if(Charge_Bat_Task_ptr != RT_NULL)
        {
            rt_thread_startup(Charge_Bat_Task_ptr);
            rt_kprintf("Charge_Bat_Task start...\n");
        }
        //初始化消息队列，创建消息队列
        result = rt_mq_init(&mq_Charge,/*消息队列对象的句柄*/
                            "mqt_mq_Charge",/*消息队列的名称*/
                            &msg_pool_Charge[0], /*内存池指向msg_pool_Charge*/
                            1, /*每个消息的大小是1字节*/
                            sizeof(msg_pool_Charge), /* 内存池的大小是 msg_pool_Charge的大小*/
                            RT_IPC_FLAG_FIFO); /* 如果有多个线程等待， 按照先来先得到的方法分配消息 */
        if (result != RT_EOK)
        {
            rt_kprintf("init message queue failed.\n");
        }
}