Maxim Integrated 73S12xxF Software - Manual (Page 58)

73S12xxF Software User Guide UG_12xxF_016
58 Rev. 1.50
Synopsis Unsigned Integer *Add_Timer ( IN Unsigned integer nDuration)
Parameters nDuration: Input parameter
Specifies duration of time in 10 ms units.
Return Value Pointer to added timer. If the value is zero (NULL), there are no timers available.
This function can be called inside an ISR. When the timer expires (*pTimer == 0), it will be automatically
removed. If all timers are in use, a NULL pointer will be returned. The
Process_Timers() routine must be
called to keep the timer updated.
Add_Timer_Func()
Purpose Add a 10 ms software timer and the function to execute on timer expiration.
Synopsis Unsigned Integer *Add_Timer_Func (
IN unsigned int nDuration,
IN void (*pfExpire (void)) );
Parameters nDuration: Input parameter
Specifies duration of time in 10 ms units.
pfExpire: Input parameter
Specifies a pointer to the function to execute when the timer expires.
Return Value Pointer to the added timer. If value is zero, there are no timers available.
Remove_Timer()
Purpose Stop and remove the selected timer.
Synopsis Void Remove_Timer ( IN unsigned integer *pTimerId );
Parameters ptimerID: Input parameter
Specifies which timer to stop and remove. This is the value returned by the
Add_Timer() or Add_Timer_Func() functions.
Return Codes None.
Process_Timers()
Purpose Process and update the active timers. This function must be called from a
foreground routine whenever there is active timer.
Synopsis Void Process_Timers ( void );
Parameters None.
Return Codes None.
4.2.13 User IO API – Available with all 73S12xxF Devices
The USER IO Pins can be configured, individually, as an interrupt source to Timer 0, Timer 1, INT0 or
INT1. For INT0 or INT1, the interrupt can be configured to occur on the rising edge/high level or falling
edge/low level. Only INT0 can be used to wake up the CPU from sleep/halt mode. This API includes:
•
USR_INT_Config () (page 59)
•
USR_INT_Read() (page 59)
•
USER_IO_Config() (page 60)
•
USER_IO_Read() (page 60)
•
USER_IO_Write() (page 60)