ui_sync_led.c

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#include <includes.h>

#define FLASH_PERIOD_HALFQUARTER 125 //125ms
#define FLASH_PERIOD_QUARTER 250 //250ms
#define FLASH_PERIOD_HALF 500 //500ms
#define FLASH_PERIOD_SEC 1000 //1000ms
#define LED_ON_PERIOD 50  //50ms

int led_on_flag = 0;
int ts = 0;

static INT_VOID_F led_get_timestamp = intvoid;

void ui_sync_led_init(INT_VOID_F timestamp_in)
{
  led_get_timestamp = timestamp_in;
  ui_sync_led_off();
}

void ui_sync_led_on(void)
{
//  ui_led_rgb(1, 100,0,0);   //LED1, red, at back
  FIO0SET = 1<<16;    //Green top LED on
}

void ui_sync_led_off(void)
{
//  ui_led_rgb(1, 0,0,0); //LED1, red, at back
  FIO0CLR = 1<<16;      //Green top LED off
}

void ui_sync_led_flash(void)
{  
  static unsigned short flag = 0;
  unsigned long remainder;

  remainder = led_get_timestamp() % FLASH_PERIOD_HALFQUARTER;
  
  //This logic is intended to detect the first iteration at which the remainder
  //has passed zero, and to run the ui_sync_led_flash_pattern at that time only.
  //Note that the remainder is non-negative.
  if (remainder < (FLASH_PERIOD_HALFQUARTER >> 1))
  {
    if (flag)
    {
      ui_sync_led_flash_pattern();
    }
    flag = 0;       
  }
  else
  {
    flag = 1;
  } 
}

static void ui_sync_led_flash_pattern(void)
{
  static int sync_flag = 0;
  static unsigned short flag = 0;
  unsigned long remainder = led_get_timestamp() % FLASH_PERIOD_SEC;
  int sync_count = (led_get_timestamp() / FLASH_PERIOD_HALFQUARTER) % 8;

  if(led_get_timestamp() - ts > LED_ON_PERIOD) led_on_flag = 0;

  //This logic is intended to detect the first iteration at which the remainder
  //has passed zero, and to run the ui_sync_led_flash_pattern at that time only.
  //Note that the remainder is non-negative.
  if (remainder < (FLASH_PERIOD_SEC >> 1))
  {
    if (flag)
    {
      sync_flag++;
      if (sync_flag >= 10)
      {
        sync_flag = 0;
      }     
      flag = 0;
    }       
  }
  else
  {
    flag = 1;
  }
  switch (sync_flag) {  
    case 0:
      if ((sync_count == 0) || (sync_count == 6)){
        led_on_flag = 1;
        ts = led_get_timestamp();
      } 
//      else if (sync_count == 2){
//        ui_sync_led_off();
//      }
      break;   
    case 1:
      if (sync_count == 2){
        led_on_flag = 1;
        ts = led_get_timestamp();
      } 
//      else if (sync_count == 4){
//        ui_sync_led_off();
//      } 
      break;     
    case 2:
      if ((sync_count == 0) || (sync_count == 4)){
        led_on_flag = 1;
        ts = led_get_timestamp();
      } 
//      else if ((sync_count == 2) || (sync_count == 6)){
//        ui_sync_led_off();
//      }  
      break;     
    case 3:
      if ((sync_count == 0) || (sync_count == 7)){
        //ui_sync_led_on();
        led_on_flag = 1;
        ts = led_get_timestamp();
      } 
//      else if (sync_count == 2){
//        ui_sync_led_off();
//      } 
      break;
    case 4:
      if ((sync_count == 2) || (sync_count == 6)){
        //ui_sync_led_on();
        led_on_flag = 1;
        ts = led_get_timestamp();
      } 
//      if ((sync_count == 0) || (sync_count == 4)){
//        ui_sync_led_off();
//      } 
      break;
    case 5:
      if (sync_count == 2){
        led_on_flag = 1;
        ts = led_get_timestamp();
      } 
//      else if ((sync_count == 0) || (sync_count == 4)){
//        ui_sync_led_off();
//      } 
      break;
    case 6:
      if ((sync_count == 0) || (sync_count == 4)){
        ui_sync_led_on();
      } 
//      else if ((sync_count == 2) || (sync_count == 6)){
//        ui_sync_led_off();
//      }  
      break;
    case 7:
      if ((sync_count == 0) || (sync_count == 4)){
        //ui_sync_led_on();
        led_on_flag = 1;
        ts = led_get_timestamp();
      } 
//      else if ((sync_count == 2) || (sync_count == 6)){
//        ui_sync_led_off();
//      } 
      break;
    case 8:
      if ((sync_count == 0) || (sync_count == 4) || (sync_count == 6)){
        //ui_sync_led_on();
        led_on_flag = 1;
        ts = led_get_timestamp();
      } 
//      else if ((sync_count == 2) || (sync_count == 5) || (sync_count == 7)){
//        ui_sync_led_off();
//      }
      break;
      
    case 9:
      if ((sync_count == 0) || (sync_count == 2) || (sync_count == 4) || (sync_count == 6)){
        //ui_sync_led_on();
        led_on_flag = 1;
        ts = led_get_timestamp();
      } 
//      else if ((sync_count == 1) || (sync_count == 3) || (sync_count == 5) || (sync_count == 7)){
//        ui_sync_led_off();
//      }
      break;           
  }

  //flash LED
  if(led_on_flag == 1) ui_sync_led_on();
  else ui_sync_led_off();
}