qnx str-ctl

最新推荐文章于 2024-10-17 12:59:54 发布

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最新推荐文章于 2024-10-17 12:59:54 发布 · 1.1k 阅读

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#qnx #camera #suspend resume

本文详细解释了str-ctl在QNX系统中的作用，涉及设备休眠、唤醒时的参数设置，以及与powermanager的交互，展示了如何通过str-ctl命令执行整机休眠过程和相关模块的同步操作。

str-ctl 实现源码

AMSS/platform/services/applications/str-ctl/main.c

int main ( int argc, char** argv)
{
    int c ;
    uint64_t entry_timeout_nsec = 1000000000ull;
    uint64_t wakeup_timeout_nsec = 1000000000ull;
    bool initiate = false ;

    while( ( c = getopt( argc, argv, "e:w:i" ) ) != -1 ) {
        switch( c ) {
            case 'e':
                entry_timeout_nsec = strtoull ( optarg, NULL, 0 );
                break;
            case 'w':
                wakeup_timeout_nsec = strtoull ( optarg, NULL, 0 );
                break;
            case 'i':
                initiate = true;
                break;
            case '?':
                ERR("Invalid option(%c), see \"use %s\"", c, argv[0]);
                return -1;
        }
    }

    if ( !initiate ) {
        ERR("'-i' option mandatory, see \"use %s\"", argv[0]);
        return EOK ;
    }

    int fd = open ( "/dev/pm", O_RDWR | O_CLOEXEC) ;
    if ( fd < 0 ) {
        ERR ("open(/dev/pm) failed, err=%d", errno);
        return -1;
    }

    struct timespec start, stop;
    uint64_t cycle, ncycles;
    uint64_t duration_nsec ;

    struct pm_str_s cmd = {0};
    cmd.entry_timeout = entry_timeout_nsec ;
    cmd.wakeup_timeout = wakeup_timeout_nsec ;

    (void) clock_gettime( CLOCK_REALTIME, &start) ;
    cycle = ClockCycles();

    int const rc = devctl ( fd, DCMD_PM_ENTER_STR , &cmd, sizeof (struct pm_str_s), 0 );

    ncycles = ClockCycles() - cycle;
    (void) clock_gettime( CLOCK_REALTIME, &stop) ;

    duration_nsec = timespec2nsec (&stop) - timespec2nsec (&start);

    if ( rc == EOK && duration_nsec < wakeup_timeout_nsec ) {
        LOG("STR interrupted, expected to sleep=%llu ms, actual sleep =%llu ms",
                NSEC_TO_MSEC ( wakeup_timeout_nsec ), NSEC_TO_MSEC (duration_nsec ));
    }

    LOG("DCMD_PM_ENTER_STR %s rc=%d",  rc ? "failed" : "succeeded" , rc );
    LOG("Elapsed system time -> %fs", 1.0f * duration_nsec / ( BILLION * 1.0f) );
    LOG("Elapsed raw cycles time -> %fs", (double) ncycles / SYSPAGE_ENTRY(q