用正点原子STM32F4探索者开发板，系统使用RT_THREAD V4.0.3，做DHT11温度采集实验时，定义read_temp_thread 线程为高优先级（初始编程线程未让出CPU），led_thread为低优先级，理论来说，read_temp_thread 线程会一直占用CPU，下载到板子之后发现led_thread线程会正常运行。求解答!!!
/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2018-11-06 SummerGift first version * 2018-11-19 flybreak add stm32f407-atk-explorer bsp */#include <rtthread.h>#include <rtdevice.h>#include <board.h>#include <sensor.h>#include <sensor_dallas_dht11.h>#define LED0_PIN GET_PIN(F, 9)#define DHT11_DATA_PIN GET_PIN(G, 9)#define THREAD_PRIORITY 15//#define THREAD_STACK_SIZE 512#define THREAD_TIMESLICE 5ALIGN(RT_ALIGN_SIZE)static char led_thread_stack[1024];static struct rt_thread led_thread;static char read_temp_stack[2048];static struct rt_thread read_temp_thread;static void led_thread_entry(void *param){ rt_pin_mode(LED0_PIN, PIN_MODE_OUTPUT); while (1) { rt_pin_write(LED0_PIN, PIN_HIGH); rt_thread_mdelay(500); rt_pin_write(LED0_PIN, PIN_LOW); rt_thread_mdelay(500); rt_kprintf("led_thread running!\n"); }}static void read_temp_entry(void *param){ rt_device_t dev = RT_NULL; struct rt_sensor_data sensor_data; rt_uint8_t get_data_freq = 1; /* 1Hz */ rt_size_t res; dev = rt_device_find(param); if(dev == RT_NULL) { rt_kprintf("can't find device:%s",param); return; } if(rt_device_open(dev,RT_DEVICE_FLAG_RDWR) != RT_EOK) { rt_kprintf("can't open the device:%c",param); return; } rt_device_control(dev,RT_SENSOR_CTRL_SET_ODR,(void *)(&get_data_freq)); while(1) { res = rt_device_read(dev,1,&sensor_data,2); if(res != 1) { rt_kprintf("can't read the device:%c\n",param); return; } else { if(sensor_data.data.temp >= 0) { uint8_t temp = (sensor_data.data.temp&0xffff)>>0; uint8_t humi = (sensor_data.data.temp&0xffff0000)>>16; rt_kprintf("temp:%d,humi:%d\n",temp,humi); } } //rt_thread_mdelay(1000); }}int main(void){ rt_thread_init(&led_thread, "thread2", led_thread_entry, RT_NULL, &led_thread_stack[0], sizeof(led_thread_stack), THREAD_PRIORITY-1,THREAD_TIMESLICE); rt_thread_startup(&led_thread); rt_thread_init(&read_temp_thread, "read_temp", read_temp_entry, "temp_dht11", &read_temp_stack[0], sizeof(read_temp_stack), THREAD_PRIORITY-2,THREAD_TIMESLICE); rt_thread_startup(&read_temp_thread);}static int rt_hw_dht11_port(void){ struct rt_sensor_config cfg; cfg.intf.user_data = (void *)DHT11_DATA_PIN; rt_hw_dht11_init("dht11", &cfg); return RT_EOK;}INIT_COMPONENT_EXPORT(rt_hw_dht11_port);
