Intermec ck1 Reference Guide

 

Purpose:  Force the system into Idle mode whether the APM is enabled or not. In 

Idle mode, the MPU clock frequency is 10 MHz, and the system returns 
to Normal mode when you press the keypad.  

When the system enters Idle mode: 

Send signal SIGSUSPEND to every user-space application. 

Wait 0.25 second. Application is given the opportunity to write 
everything to flash disk after receiving this signal. 

Flush the file system cache buffers to flash disk. 

Enter Idle mode. 

 

Syntax: 

int devApmIdle( void )

 

 On-CK1 Parameters: None 

 

On-CK1 Return: -1 

 Function 

failed 

0 Function 

succeeded 

 On-Host Parameters: None 

 

On-Host Return:  Always return 0 

 

Example:  Sample program to demonstrate how user-space applications deal with the 

signal SIGSUSPEND. 

#include <signal.h> 
 
static void write_everything(int); 
 
int main (void) 
{ 
  // register the signal service routine 
  if (signal(SIGSUSPEND, write_everything) == SIG_ERR) 
    printf(“

Can’t register write_everything

() to SIGUSR1\n”); 

 
  // write your codes below 
} 
 
static void write_everything(int signo) 
{ 
  // 

write your codes to write everything to flash disk below

 

  devApmFileCopy(“/var/myfile”, “/home/myfile”); 
}  

 

Purpose:  In Standby mode, MPU clock stops. The system exits Standby mode when 

the Power key is pressed, serial data is received (RING from the modem 
dock), or an RTC Alarm event occurs.  

When the system enters Standby mode: 

Send signal SIGSLOW to every user-space application.