usrapp.h:

struct usrapp_t
{
    struct vsfsm_msm_t msm;
    struct vsfsm_t sm;
    struct vsfsm_msm_entry_t trans_tbl[3];
};

extern struct usrapp_t usrapp;
void usrapp_srt_init(struct usrapp_t *app);

usrapp.c:

#include "vsf.h"
#include "usrapp.h"

enum
{
    STATE_INIT = 0,
    STATE_ON,
    STATE_OFF,
};

#define USRAPP_EVT_ON1S                 VSFSM_EVT_USER
int usrapp_do_init(struct vsfsm_msm_t *msm);
int usrapp_do_on(struct vsfsm_msm_t *msm);
int usrapp_do_off(struct vsfsm_msm_t *msm);
struct usrapp_t usrapp =
{
    .msm.entry_num              = dimof(usrapp.trans_tbl),
    .msm.trans_tbl              = usrapp.trans_tbl,
    .msm.user_data              = &usrapp,
    .msm.state                  = STATE_INIT,

    .trans_tbl[0]               = {STATE_INIT, VSFSM_EVT_INIT, NULL, usrapp_do_init},
    .trans_tbl[1]               = {STATE_ON, USRAPP_EVT_ON1S, NULL, usrapp_do_off},
    .trans_tbl[2]               = {STATE_OFF, USRAPP_EVT_ON1S, NULL, usrapp_do_on},
};

int usrapp_do_on(struct vsfsm_msm_t *msm)
{
    vsfhal_gpio_set(1, 1 << 1);
    return STATE_ON;
}
int usrapp_do_off(struct vsfsm_msm_t *msm)
{
    vsfhal_gpio_clear(1, 1 << 1);
    return STATE_OFF;
}
int usrapp_do_init(struct vsfsm_msm_t *msm)
{
    vsfhal_gpio_init(1);
    vsfhal_gpio_config_pin(1, 1, GPIO_OUTPP);
    vsftimer_create(msm->sm, 1000, -1, USRAPP_EVT_ON1S);
    return usrapp_do_off(msm);
}

void usrapp_srt_init(struct usrapp_t *app)
{
    vsfsm_msm_init(&app->sm, &app->msm);
}

元状态机是选修，这个就自己看了。