Difference between revisions of "Unit PL031"

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|-
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! '''Address'''
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! Address
 
| The address of the PL031 registers
 
| The address of the PL031 registers
 
|-
 
|-
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! '''Name'''
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! Name
 
| The text description of this device which will show in the device list (Optional)
 
| The text description of this device which will show in the device list (Optional)
 
|-
 
|-
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! '''IRQ'''
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! IRQ
 
| The interrupt number for the PL031
 
| The interrupt number for the PL031
 
|-
 
|-
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! '''Return'''
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! Return
 
| Pointer to the new RTC device or nil if the RTC device could not be created
 
| Pointer to the new RTC device or nil if the RTC device could not be created
 
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! '''RTC'''
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! RTC
 
| The RTC device to destroy
 
| The RTC device to destroy
 
|-
 
|-
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! '''Return'''
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! Return
 
| ERROR_SUCCESS if completed or another error code on failure
 
| ERROR_SUCCESS if completed or another error code on failure
 
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! '''Note'''
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! Note
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| Not intended to be called directly by applications, use RTCDeviceStart instead
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| Not intended to be called directly by applications, use RTCDeviceStart instead.
 
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| Not intended to be called directly by applications, use RTCDeviceStop instead.
 
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Revision as of 04:43, 24 April 2018

Return to Unit Reference


Description

ARM PrimeCell PL031 Real Time Clock Driver unit

The PL031 is a simple memory mapped Real Time Clock (RTC) device that supports a single 32-bit time counter based on the Unix time format which starts at 1 Jan 1970 and runs out at 19 Jan 2038.

The device also includes a single alarm value which can trigger an interrupt when the selected time is reached.

This driver currently does not support reading or setting the alarm value.

Constants


[Expand]
PL031 specific constants PL031_*


[Expand]
PL031 RTC control register PL031_RTC_CR_*


[Expand]
PL031 RTC interrupt mask set and clear register PL031_RTC_IMSC_*


[Expand]
PL031 RTC raw interrupt status register PL031_RTC_RIS_*


[Expand]
PL031 RTC masked interrupt status register PL031_RTC_MIS_*


[Expand]
PL031 RTC interrupt clear register PL031_RTC_ICR_*


Type definitions


PL031 real time clock (RTC) registers

[Expand]

PPL031RTCRegisters = ^TPL031RTCRegisters;

TPL031RTCRegisters = record

PL031 real time clock (RTC)

[Expand]

PPL031RTC = ^TPL031RTC;

TPL031RTC = record


Public variables

None defined

Function declarations


PL031 functions

[Expand] 
function PL031RTCCreate(Address:LongWord; const Name:String; IRQ:LongWord):PRTCDevice;
Description: Create, register and start a new PL031 RTC device which can be accessed using the RTC API


[Expand] 
function PL031RTCDestroy(RTC:PRTCDevice):LongWord;
Description: Stop, deregister and destroy a PL031 RTC device created by this driver


PL031 RTC functions

[Expand] 
function PL031RTCStart(RTC:PRTCDevice):LongWord;
Description: Implementation of RTCDeviceStart API for PL031 RTC


[Expand] 
function PL031RTCStop(RTC:PRTCDevice):LongWord;
Description: Implementation of RTCDeviceStop API for PL031 RTC


[Expand] 
function PL031RTCGetTime(RTC:PRTCDevice):Int64;
Description: Implementation of RTCDeviceGetTime API for PL031 RTC


[Expand] 
function PL031RTCSetTime(RTC:PRTCDevice; const Time:Int64):Int64;
Description: Implementation of RTCDeviceSetTime API for PL031 RTC


PL031 helper functions

[Expand] 
function PL031FileTimeToRTCTime(RTC:PRTCDevice; const FileTime:Int64; var RTCTime:LongWord):Boolean;
Description: Convert a FileTime value in 100 nanosecond ticks since 1 January 1601 to the time format of the PL031 RTC which is seconds since 1 January 1970


[Expand] 
function PL031RTCTimeToFileTime(RTC:PRTCDevice; RTCTime:LongWord; var FileTime:Int64):Boolean;
Description: Convert a PL031 RTC time value in seconds since 1 January 1970 to the FileTime format which is 100 nanosecond ticks since 1 January 1601


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