API Application Example



API Header File

  #ifndef	__LED_H__
  #define	__LED_H__
  
  #include	<stdint.h>		/* uint??_t */
  #include	<stdbool.h>		/* Bool */
  
  /***************************************************************************/
  /*	For LED
  */
  /***************************************************************************/
  //	#define	DEVICE_LED_DEBUG_MESSAGE
  
  #define	DEVICE_LED_B14		"/sys/class/leds/b14/brightness"
  #define	DEVICE_LED_A25		"/sys/class/leds/a25/brightness"
  #define	DEVICE_LED_C21		"/sys/class/leds/c21/brightness"
  #define	DEVICE_LED_B15		"/sys/class/leds/b15/brightness"
  
  #define	DEVICE_LED_OIL_STATION_HANDY_READY		DEVICE_LED_B14
  #define	DEVICE_LED_OIL_STATION_HANDY_PROCESS	DEVICE_LED_A25
  #define	DEVICE_LED_OIL_STATION_HANDY_COLPLETE	DEVICE_LED_C21
  #define	DEVICE_LED_OIL_STATION_HANDY_ERROR		DEVICE_LED_B15
  
  #define	DEVICE_LED_OIL_STATION_AP_STATUS		DEVICE_LED_B14
  #define	DEVICE_LED_OIL_STATION_AP_ERROR			DEVICE_LED_B15
  
  #define	DEVICE_LED_OIL_STATION_PRINTER_BUSY		DEVICE_LED_B14
  #define	DEVICE_LED_OIL_STATION_PRINTER_READY	DEVICE_LED_A25
  #define	DEVICE_LED_OIL_STATION_PRINTER_NO_PAPER	DEVICE_LED_B15
  
  
  /*	LED On/Off
  Input
  	true = LED On
  	false= LED Off
  Return
  	0	= Opened
  	-1	= Input Parameter Error
  	-2	= Fail to Access Device
  	-3	= Fail to Operation
  */
  extern	int	led_switch(uint8_t *pDeviceName, bool Switch/*true=on, false=Off*/);
  
  
  /*	get LED state
  Return
  	0	= Opened
  	-1	= Input Parameter Error
  	-2	= Fail to Access Device
  	-3	= Fail to Operation
  
  *pIsOn	: true = LED is On, false = LED is Off
  */
  extern	int	led_get(uint8_t *pDeviceName, bool *pIsOn);
  
  #endif	/* __LED_H__ */


API Source File

  #include	<stdio.h>
  #include	<stdint.h>		/* uint??_t */
  #include	<stdbool.h>		/* bool */
  #include	<stdlib.h>		/* strtoul */
  #include	<string.h>		/* for memset */
  #include	<unistd.h>		/* for open/close .. */
  #include	<fcntl.h>		/* for O_RDWR */
  #include	<sys/ioctl.h>	/* for ioctl */
  #include	<sys/fcntl.h>	/* for O_RDWR */
  
  #include	"LED.h"
  
  
  /*	LED On/Off
  Input
  	true = LED On
  	false= LED Off
  Return
  	0	= Opened
  	-1	= Input Parameter Error
  	-2	= Fail to Access Device
  	-3	= Fail to Operation
  */
  int	led_switch(uint8_t *pDeviceName, bool Switch/*true=on, false=Off*/)
  {
  	FILE *	pDeviceFile;
  	char	pString[2] = { 0, 0 };
  	int		StringLength;
  
  	if ( pDeviceName == (uint8_t *)0 )
  	{
  #ifdef	DEVICE_LED_DEBUG_MESSAGE
  		printf("led_switch : Input Parameter error\n");
  #endif	/* DEVICE_LED_DEBUG_MESSAGE */
  		return	-1;
  	}
  
  	pDeviceFile = fopen ( pDeviceName, "w+");
  	if ( pDeviceFile == (FILE *)0 )
  	{
  #ifdef	DEVICE_LED_DEBUG_MESSAGE
  		printf ( "led_switch : failed to open LED device : %s\n", pDeviceName );
  #endif	/* DEVICE_LED_DEBUG_MESSAGE */
  		return	-2;
  	}
  
  	if ( Switch == true )
  	{
  		pString[0] = '1';
  	}
  	else
  	{
  		pString[0] = '0';
  	}
  	StringLength = (int)strlen(pString);
  	if ( fwrite ( pString, StringLength, 1, pDeviceFile ) < 0 )
  	{
  #ifdef	DEVICE_LED_DEBUG_MESSAGE
  		printf ( "led_switch : failed to operation LED device : %s\n", pDeviceName );
  #endif	/* DEVICE_LED_DEBUG_MESSAGE */
  		return	-3;
  	}
  
  	fclose ( pDeviceFile );
  
  	return	0;
  }
  
  
  /*	get LED state
  Return
  	0	= Opened
  	-1	= Input Parameter Error
  	-2	= Fail to Access Device
  	-3	= Fail to Operation
  
  *pIsOn	: true = LED is On, false = LED is Off
  */
  int	led_get(uint8_t *pDeviceName, bool *pIsOn)
  {
  	FILE *	pDeviceFile;
  	char	pCommand[128] = {0};
  	char	pString[10] = {0};
  	int		Value;
  
  	if ( ( pDeviceName == (uint8_t *)0 ) || ( pIsOn == (bool *)0 ) )
  	{
  #ifdef	DEVICE_LED_DEBUG_MESSAGE
  		printf("led_get : Input Parameter error\n");
  #endif	/* DEVICE_LED_DEBUG_MESSAGE */
  		return	-1;
  	}
  
  	sprintf(pCommand, "cat %s", pDeviceName);
  	pDeviceFile = popen(pCommand, "r");
  	if ( pDeviceFile == (FILE *)0 )
  	{
  #ifdef	DEVICE_LED_DEBUG_MESSAGE
  		printf("led_get : device open fail\n");
  #endif	/* DEVICE_LED_DEBUG_MESSAGE */
  		return	-2;
  	}
  
  	while( fgets (pString, 10, pDeviceFile) );
  	Value = (uint32_t)strtoul ( pString, NULL, 10 );
  	fclose (pDeviceFile);
  
  	*pIsOn = ((Value == 0) ? false:true);
  
  	return	0;
  }