qnx中MCUService通过注册共享内存监听property的方式提供IPC接口给FawSysCtlService,用于触发MCU升级;代码实现加注释
时间: 2024-06-02 21:13:38 浏览: 13
以下是对QNX中MCUService通过注册共享内存监听property的方式提供IPC接口给FawSysCtlService的代码实现加注释:
// 首先定义MCU升级需要的共享内存结构体
typedef struct {
int version; // 版本号
char data[1024]; // 数据
} mcu_upgrade_t;
// 在MCUService中创建共享内存并初始化
mcu_upgrade_t* mcu_upgrade = mmap(NULL, sizeof(mcu_upgrade_t), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
mcu_upgrade->version = 0;
memset(mcu_upgrade->data, 0, sizeof(mcu_upgrade->data));
// 在MCUService中注册property,用于监听FawSysCtlService传递的升级指令
int fd = open("/pps/mcu_upgrade", O_RDWR);
if (fd == -1) {
perror("open");
exit(EXIT_FAILURE);
}
int rc = ftruncate(fd, sizeof(mcu_upgrade_t));
if (rc == -1) {
perror("ftruncate");
exit(EXIT_FAILURE);
}
char* buf = mmap(NULL, sizeof(mcu_upgrade_t), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (buf == MAP_FAILED) {
perror("mmap");
exit(EXIT_FAILURE);
}
// 在MCUService中监听property的变化,如果有变化则触发MCU升级
while (1) {
rc = readcond(fd, &buf, sizeof(mcu_upgrade_t), NULL, COND_INPUT, _IOC_READ);
if (rc == -1) {
perror("read");
exit(EXIT_FAILURE);
}
if (mcu_upgrade->version != 0) {
// 触发MCU升级
printf("MCU upgrade triggered\n");
mcu_upgrade->version = 0; // 重置版本号
memset(mcu_upgrade->data, 0, sizeof(mcu_upgrade_t)); // 清空数据
}
}
// 在FawSysCtlService中向property写入升级指令
int fd = open("/pps/mcu_upgrade", O_WRONLY);
if (fd == -1) {
perror("open");
exit(EXIT_FAILURE);
}
mcu_upgrade_t upgrade;
upgrade.version = 1; // 指定版本号,表示触发升级
strcpy(upgrade.data, "MCU upgrade data"); // 设置升级数据
int rc = write(fd, &upgrade, sizeof(mcu_upgrade_t));
if (rc == -1) {
perror("write");
exit(EXIT_FAILURE);
}
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