bearpi开发板之HarmonyOS编译框架介绍

编译控制的Json文件

业务gn文件，这里以my_led目录下的为例

• 编译后生的libmyled.a

模块gn文件,这里选择 "my_led:myled"模块参与编译

# Copyright (c) 2020 Nanjing Xiaoxiongpai Intelligent Technology Co., Ltd. # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import("//build/lite/config/component/lite_component.gni") lite_component("app") { features = [ #"A1_kernal_thread:thread_example", #"A2_kernel_timer:timer_example", #"A3_kernel_event:event_example", #"A4_kernel_mutex:mutex_example", #"A5_kernel_semaphore:semaphore_example", #"A6_kernel_message:message_example", #"B1_basic_led_blink:led_example", #"B2_basic_button:button_example", #"B3_basic_pwm_led:pwm_example", #"B4_basic_adc:adc_example", #"B5_basic_i2c_nfc:i2c_example", #"B6_basic_uart:uart_example", #"C1_e53_sf1_mq2:e53_sf1_example", #"C2_e53_ia1_temp_humi_pls:e53_ia1_example", #"C3_e53_sc1_pls:e53_sc1_example", #"C4_e53_sc2_axis:e53_sc2_example", #"C5_e53_is1_infrared:e53_is1_example", #"D1_iot_wifi_ap:wifi_ap", #"D2_iot_wifi_sta_connect:wifi_sta_connect", #"D3_iot_udp_client:udp_client", #"D4_iot_tcp_server:tcp_server", #"D5_iot_mqtt:iot_mqtt", #"D6_iot_cloud_oc:oc_mqtt", #"D7_iot_cloud_onenet:onenet_mqtt", #"D8_iot_cloud_oc_smoke:cloud_oc_smoke", #"D9_iot_cloud_oc_light:cloud_oc_light", #"D10_iot_cloud_oc_manhole_cover:cloud_oc_manhole_cover", #"D11_iot_cloud_oc_infrared:cloud_oc_infrared", #"D12_iot_cloud_oc_agriculture:cloud_oc_agriculture", #"D13_iot_cloud_oc_gps:cloud_oc_gps", "my_led:myled", ] } 

注册入口函数

void my_led_example(void) { static uint8_t cnt; cnt++; printf("-------> my_led_example %d",cnt); usleep(1000000); } SYS_RUN(my_led_example); 

• 使用SYS_RUN宏关联入口函数，SYS_RUN宏原型如下：

#define SYS_RUN(func) LAYER_INITCALL_DEF(func, run, "run") 

• LAYER_INITCALL_DEF宏原型如下：

#define LAYER_INITCALL_DEF(func, layer, clayer) \ LAYER_INITCALL(func, layer, clayer, 2) 

• LAYER_INITCALL宏原型如下：

#define LAYER_INITCALL(func, layer, clayer, priority) \ static const InitCall USED_ATTR __zinitcall_##layer##_##func \ __attribute__((section(".zinitcall." clayer #priority ".init"))) = func 

• InitCall 原型

typedef void (*InitCall)(void); 

• USED_ATTR宏原型

#define USED_ATTR __attribute__((used)) 

• SYS_RUN(my_led_example)展开分析:

• LAYER_INITCALL_DEF(my_led_example, run, “run”)

• LAYER_INITCALL(my_led_example, run, “run”, 2)

• static const InitCall USED_ATTR __zinitcall_run_my_led_example attribute((section(“.zinitcall.run2.init”))) = my_led_example 这样函数指针_zinitcall_run_my_led_example指向了my_led_example，并编译到.zinitcall.run2.init段当中。

HOS_SystemInit中调用MODULE_INIT(run)来调用注册的入口函数my_led_example

void HOS_SystemInit(void) { MODULE_INIT(bsp); MODULE_INIT(device); MODULE_INIT(core); SYS_INIT(service); SYS_INIT(feature); MODULE_INIT(run); SAMGR_Bootstrap(); } 

• MODULE_INIT宏原型如下：

#define MODULE_INIT(name) \ do { \ MODULE_CALL(name, 0); \ } while (0) 

• MODULE_CALL宏原型

#define MODULE_CALL(name, step) \ do { \ InitCall *initcall = (InitCall *)(MODULE_BEGIN(name, step)); \ InitCall *initend = (InitCall *)(MODULE_END(name, step)); \ for (; initcall < initend; initcall++) { \ (*initcall)(); \ } \ } while (0) 

• MODULE_BEGIN宏原型

#define MODULE_BEGIN(name, step) __section_begin(MODULE_NAME(name, step)) 

• MODULE_END宏原型

#define MODULE_END(name, step) __section_end(MODULE_NAME(name, step)) 

• MODULE_INIT(run)调用展开如

do { \ MODULE_CALL(run, 0); \ } while (0) 

• MODULE_CALL(run, 0)展开

do { \
        InitCall *initcall = (InitCall *)(MODULE_BEGIN(run, 0)); \
        InitCall *initend = (InitCall *)(MODULE_END(run, 0)); \ for (; initcall < initend; initcall++) { \ (*initcall)(); \ } \ } while (0) 

• MODULE_BEGIN(run, 0)展开

__section_begin(MODULE_NAME(run, 0)) 

• MODULE_NAME宏原型

#define MODULE_NAME(name, step) ".zinitcall." #name #step ".init" 

• 最后展开MODULE_BEGIN(run, 0)如下

__section_begin(".zinitcall.run0.init")) 

• MODULE_END(run, 0))展开后

__section_end(".zinitcall.run0.init") 

• 通过函数指针遍历指定段保存的函数指针进行调用 (*initcall)();

do { \
        InitCall *initcall = (InitCall *)__section_begin(".zinitcall.run0.init")); \
        InitCall *initend = (InitCall *)__section_end(".zinitcall.run0.init"); \ for (; initcall < initend; initcall++) { \ (*initcall)(); \ } \ } while (0) 

编译烧录，运行结果如下

通过宏生成的函数指针变量名进行调用，测试函数如下

void test(void) { __zinitcall_run_my_led_example(); } 

• 在HOS_SystemInit函数中调用test函数

void HOS_SystemInit(void) { MODULE_INIT(bsp); MODULE_INIT(device); MODULE_INIT(core); SYS_INIT(service); SYS_INIT(feature); MODULE_INIT(run); test(); SAMGR_Bootstrap(); } 

• 编译烧录，运行结果如下