Unit PL011

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Description

ARM PrimeCell PL011 UART Driver unit

To be documented

Constants


PL011 specific constants PL011_*
PL011_UART_DESCRIPTION = 'ARM PrimeCell PL011 UART'; Description of PL011 device
 
PL011_UART_MIN_BAUD = 300; Default minimum of 300 baud
PL011_UART_MAX_BAUD = 1500000; Default maximum based on 24MHz clock
 
PL011_UART_MIN_DATABITS = SERIAL_DATA_5BIT;  
PL011_UART_MAX_DATABITS = SERIAL_DATA_8BIT;  
 
PL011_UART_MIN_STOPBITS = SERIAL_STOP_1BIT;  
PL011_UART_MAX_STOPBITS = SERIAL_STOP_2BIT;  
 
PL011_UART_MAX_PARITY = SERIAL_PARITY_EVEN;  
 
PL011_UART_MAX_FLOW = SERIAL_FLOW_RTS_CTS;  
 
PL011_UART_CLOCK_RATE = 24000000;  
 
PL011_UART_RX_POLL_LIMIT = 256; Number of times interrupt handler may poll the read FIFO
PL011_UART_RX_BUFFER_SIZE = 1024;  


PL011 UART data PL011_UART_DR_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_DR_OE = (1 shl 11); Overrun error
PL011_UART_DR_BE = (1 shl 10); Break error
PL011_UART_DR_PE = (1 shl 9); Parity error
PL011_UART_DR_FE = (1 shl 8); Framing error
PL011_UART_DR_DATA = ($FF shl 0); Receive/Transmit data
PL011_UART_DR_ERROR = PL011_UART_DR_OE or PL011_UART_DR_BE or PL011_UART_DR_PE or PL011_UART_DR_FE;


PL011 UART receive status/error clear PL011_UART_RSRECR_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_RSRECR_OE = (1 shl 3); Overrun error
PL011_UART_RSRECR_BE = (1 shl 2); Break error
PL011_UART_RSRECR_PE = (1 shl 1); Parity error
PL011_UART_RSRECR_FE = (1 shl 0); Framing error


PL011 UART flag PL011_UART_FR_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_FR_RI = (1 shl 8); Unsupported, write zero, read as don't care
PL011_UART_FR_TXFE = (1 shl 7); Transmit FIFO empty
PL011_UART_FR_RXFF = (1 shl 6); Receive FIFO full
PL011_UART_FR_TXFF = (1 shl 5); Transmit FIFO full
PL011_UART_FR_RXFE = (1 shl 4); Receive FIFO empty
PL011_UART_FR_BUSY = (1 shl 3); UART busy
PL011_UART_FR_DCD = (1 shl 2); Unsupported, write zero, read as don't care
PL011_UART_FR_DSR = (1 shl 1); Unsupported, write zero, read as don't care
PL011_UART_FR_CTS = (1 shl 0); Clear to send (This bit is the complement of the UART clear to send, nUARTCTS, modem status input. That is, the bit is 1 when nUARTCTS is LOW)


PL011 UART integer baud rate divisor PL011_UART_IBRD_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.htm
 
PL011_UART_IBRD_MASK = ($FFFF shl 0);  


PL011 UART fractional baud rate divisor PL011_UART_FBRD_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.htm
 
PL011_UART_FBRD_MASK = ($3F shl 0);  


PL011 UART line control PL011_UART_LCRH_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_LCRH_SPS = (1 shl 7); Stick parity select
PL011_UART_LCRH_WLEN = (3 shl 5); Word length
PL011_UART_LCRH_WLEN8 = (3 shl 5); 8 bits
PL011_UART_LCRH_WLEN7 = (2 shl 5); 7 bits
PL011_UART_LCRH_WLEN6 = (1 shl 5); 6 bits
PL011_UART_LCRH_WLEN5 = (0 shl 5); 5 bits
PL011_UART_LCRH_FEN = (1 shl 4); Enable FIFOs
PL011_UART_LCRH_STP2 = (1 shl 3); Two stop bits select
PL011_UART_LCRH_EPS = (1 shl 2); Even parity select (0 = odd parity/1 = even parity)
PL011_UART_LCRH_PEN = (1 shl 1); Parity enable
PL011_UART_LCRH_BRK = (1 shl 0); Send break


PL011 UART control PL011_UART_CR_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_CR_CTSEN = (1 shl 15); CTS hardware flow control enable (If this bit is set to 1 data is only transmitted when the nUARTCTS signal is asserted)
PL011_UART_CR_RTSEN = (1 shl 14); RTS hardware flow control enable (If this bit is set to 1 data is only requested when there is space in the receive FIFO for it to be received)
PL011_UART_CR_OUT2 = (1 shl 13); Unsupported, write zero, read as don't care.
PL011_UART_CR_OUT1 = (1 shl 12); Unsupported, write zero, read as don't care.
PL011_UART_CR_RTS = (1 shl 11); Request to send (This bit is the complement of the UART request to send, nUARTRTS, modem status output. That is, when the bit is programmed to a 1 then nUARTRTS is LOW).
PL011_UART_CR_DTR = (1 shl 10); Unsupported, write zero, read as don't care.
PL011_UART_CR_RXE = (1 shl 9); Receive enable
PL011_UART_CR_TXE = (1 shl 8); Transmit enable
PL011_UART_CR_LBE = (1 shl 7); Loopback enable
Bits 6:3 Reserved - Write as 0, read as don't care
PL011_UART_CR_SIRLP = (1 shl 2); Unsupported, write zero, read as don't care.
PL011_UART_CR_SIREN = (1 shl 1); Unsupported, write zero, read as don't care.
PL011_UART_CR_UARTEN = (1 shl 0); UART enable


PL011 UART interrupt FIFO level select PL011_UART_IFLS_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_IFLS_RXIFPSEL = (7 shl 9); Unsupported, write zero, read as don't care
PL011_UART_IFLS_TXIFPSEL = (7 shl 6); Unsupported, write zero, read as don't care
PL011_UART_IFLS_RXIFLSEL = (7 shl 3); Receive interrupt FIFO level select
PL011_UART_IFLS_RXIFLSEL1_8 = (0 shl 3); b000 = Receive FIFO becomes >= 1/8 full
PL011_UART_IFLS_RXIFLSEL1_4 = (1 shl 3); b001 = Receive FIFO becomes >= 1/4 full
PL011_UART_IFLS_RXIFLSEL1_2 = (2 shl 3); b010 = Receive FIFO becomes >= 1/2 full
PL011_UART_IFLS_RXIFLSEL3_4 = (3 shl 3); b011 = Receive FIFO becomes >= 3/4 full
PL011_UART_IFLS_RXIFLSEL7_8 = (4 shl 3); b100 = Receive FIFO becomes >= 7/8 full
PL011_UART_IFLS_TXIFLSEL = (7 shl 0); Transmit interrupt FIFO level select
PL011_UART_IFLS_TXIFLSEL1_8 = (0 shl 0); b000 = Transmit FIFO becomes <= 1/8 full
PL011_UART_IFLS_TXIFLSEL1_4 = (1 shl 0); b001 = Transmit FIFO becomes <= 1/4 full
PL011_UART_IFLS_TXIFLSEL1_2 = (2 shl 0); b010 = Transmit FIFO becomes <= 1/2 full
PL011_UART_IFLS_TXIFLSEL3_4 = (3 shl 0); b011 = Transmit FIFO becomes <= 3/4 full
PL011_UART_IFLS_TXIFLSEL7_8 = (4 shl 0); b100 = Transmit FIFO becomes <= 7/8 full


PL011 UART interrupt mask set/clear PL011_UART_IMSC_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_IMSC_OEIM = (1 shl 10); Overrun error interrupt mask
PL011_UART_IMSC_BEIM = (1 shl 9); Break error interrupt mask
PL011_UART_IMSC_PEIM = (1 shl 8); Parity error interrupt mask
PL011_UART_IMSC_FEIM = (1 shl 7); Framing error interrupt mask
PL011_UART_IMSC_RTIM = (1 shl 6); Receive timeout interrupt mask
PL011_UART_IMSC_TXIM = (1 shl 5); Transmit interrupt mask
PL011_UART_IMSC_RXIM = (1 shl 4); Receive interrupt mask
PL011_UART_IMSC_DSRMIM = (1 shl 3); Unsupported, write zero, read as don't care.
PL011_UART_IMSC_DCDMIM = (1 shl 2); Unsupported, write zero, read as don't care.
PL011_UART_IMSC_CTSMIM = (1 shl 1); nUARTCTS modem interrupt mask
PL011_UART_IMSC_RIMIM = (1 shl 0); Unsupported, write zero, read as don't care.


PL011 UART raw interrupt status PL011_UART_RIS_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_RIS_OERIS = (1 shl 10); Overrun error interrupt status
PL011_UART_RIS_BERIS = (1 shl 9); Break error interrupt status
PL011_UART_RIS_PERIS = (1 shl 8); Parity error interrupt status
PL011_UART_RIS_FERIS = (1 shl 7); Framing error interrupt status
PL011_UART_RIS_RTRIS = (1 shl 6); Receive timeout interrupt status
PL011_UART_RIS_TXRIS = (1 shl 5); Transmit interrupt status
PL011_UART_RIS_RXRIS = (1 shl 4); Receive interrupt status
PL011_UART_RIS_DSRMRIS = (1 shl 3); Unsupported, write zero, read as don't care.
PL011_UART_RIS_DCDMRIS = (1 shl 2); Unsupported, write zero, read as don't care.
PL011_UART_RIS_CTSMRIS = (1 shl 1); nUARTCTS modem interrupt status
PL011_UART_RIS_RIMRIS = (1 shl 0); Unsupported, write zero, read as don't care.


PL011 UART masked interrupt status PL011_UART_MIS_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_MIS_OEMIS = (1 shl 10); Overrun error masked interrupt status
PL011_UART_MIS_BEMIS = (1 shl 9); Break error masked interrupt status
PL011_UART_MIS_PEMIS = (1 shl 8); Parity error masked interrupt status
PL011_UART_MIS_FEMIS = (1 shl 7); Framing error masked interrupt status
PL011_UART_MIS_RTMIS = (1 shl 6); Receive timeout masked interrupt status
PL011_UART_MIS_TXMIS = (1 shl 5); Transmit masked interrupt status
PL011_UART_MIS_RXMIS = (1 shl 4); Receive masked interrupt status
PL011_UART_MIS_DSRMMIS = (1 shl 3); Unsupported, write zero, read as don't care.
PL011_UART_MIS_DCDMMIS = (1 shl 2); Unsupported, write zero, read as don't care.
PL011_UART_MIS_CTSMMIS = (1 shl 1); nUARTCTS modem masked interrupt status
PL011_UART_MIS_RIMMIS = (1 shl 0); Unsupported, write zero, read as don't care.


PL011 UART interrupt clear PL011_UART_ICR_*
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
PL011_UART_ICR_OEIC = (1 shl 10); Overrun error interrupt clear
PL011_UART_ICR_BEIC = (1 shl 9); Break error interrupt clear
PL011_UART_ICR_PEIC = (1 shl 8); Parity error interrupt clear
PL011_UART_ICR_FEIC = (1 shl 7); Framing error interrupt clear
PL011_UART_ICR_RTIC = (1 shl 6); Receive timeout interrupt clear
PL011_UART_ICR_TXIC = (1 shl 5); Transmit interrupt clear
PL011_UART_ICR_RXIC = (1 shl 4); Receive interrupt clear
PL011_UART_ICR_DSRMIC = (1 shl 3); Unsupported, write zero, read as don't care.
PL011_UART_ICR_DCDMIC = (1 shl 2); Unsupported, write zero, read as don't care.
PL011_UART_ICR_CTSMIC = (1 shl 1); nUARTCTS modem interrupt clear
PL011_UART_ICR_RIMIC = (1 shl 0); Unsupported, write zero, read as don't care.


PL011 UART DMA Control
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html
 
This register is disabled, writing to it has no effect and reading returns 0.


PL011 UART test control
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html


PL011 UART integration test input
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html


PL011 UART integration test output
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html


PL011 UART test data
See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/index.html


Type definitions


PL011 UART registers

PPL011UARTRegisters = ^TPL011UARTRegisters;

TPL011UARTRegisters = record

Note: Layout of the PL011 registers (See: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0183g/I18702.html))
DR:LongWord; Data Register
RSRECR:LongWord; Receive Status Register/Error Clear Register
Reserved01:LongWord;  
Reserved02:LongWord;  
Reserved03:LongWord;  
Reserved04:LongWord;  
FR:LongWord; Flag register
Reserved05:LongWord;  
ILPR:LongWord; IrDA Low-Power Counter Register
IBRD:LongWord; Integer Baud rate divisor
FBRD:LongWord; Fractional Baud rate divisor
LCRH:LongWord; Line Control register
CR:LongWord; Control register
IFLS:LongWord; Interrupt FIFO Level Select Register
IMSC:LongWord; Interrupt Mask Set Clear Register
RIS:LongWord; Raw Interrupt Status Register
MIS:LongWord; Masked Interrupt Status Register
ICR:LongWord; Interrupt Clear Register
DMACR:LongWord; DMA Control Register
Reserved11:LongWord;  
Reserved12:LongWord;  
Reserved13:LongWord;  
Reserved14:LongWord;  
Reserved15:LongWord;  
Reserved16:LongWord;  
Reserved17:LongWord;  
Reserved18:LongWord;  
Reserved19:LongWord;  
Reserved1A:LongWord;  
Reserved1B:LongWord;  
Reserved1C:LongWord;  
Reserved1D:LongWord;  
ITCR:LongWord; Test Control Register
ITIP:LongWord; Integration Test Input Register
ITOP:LongWord; Integration Test Output Register
TDR:LongWord; Test Data Register

PL011 UART properties

PPL011UART = ^TPL011UART;

TPL011UART = record

UART Properties
UART:TUARTDevice;  
PL011 Properties
IRQ:LongWord;  
Lock:TSpinHandle; Device lock (Differs from lock in UART device) (Spin lock due to use by interrupt handler)
ClockRate:LongWord; Device clock rate
Registers:PPL011UARTRegisters; Device registers
 
Start:LongWord; Index of first available buffer entry
Count:LongWord; Number of available entries in the buffer
Buffer:array[0..(PL011_UART_RX_BUFFER_SIZE - 1)] of Word; Buffer for received data (Includes data and status)
Statistics Properties
InterruptCount:LongWord; Number of interrupt requests received by the device


Public variables


PL011 specific variables

PL011_RX_IRQ_MASK:Boolean = False; If True then mask RX interrupts while RX FIFO is not empty (Allows for implementation variations)


Function declarations


PL011 functions 

function PL011UARTCreate(Address:PtrUInt; const Name:String; IRQ,ClockRate:LongWord):PUARTDevice;
Description: Create and register a new PL011 UART device which can be accessed using the UART API
Address The address of the PL011 registers
Name The text description of this device which will show in the device list (Optional)
IRQ The interrupt number for the PL011
ClockRate The clock source frequency for the PL011
Return Pointer to the new UART device or nil if the UART device could not be created 


function PL011UARTDestroy(UART:PUARTDevice):LongWord;
Description: Close, deregister and destroy a PL011 UART device created by this driver
UART The UART device to destroy
Return ERROR_SUCCESS if completed or another error code on failure


PL011 UART functions 

function PL011UARTOpen(UART:PUARTDevice; BaudRate,DataBits,StopBits,Parity,FlowControl:LongWord):LongWord;
Description: Implementation of UARTDeviceOpen API for PL011 UART
Note Not intended to be called directly by applications, use UARTDeviceOpen instead. 


function PL011UARTClose(UART:PUARTDevice):LongWord;
Description: Implementation of UARTDeviceClose API for PL011 UART
Note Not intended to be called directly by applications, use UARTDeviceClose instead. 


function PL011UARTRead(UART:PUARTDevice; Buffer:Pointer; Size,Flags:LongWord; var Count:LongWord):LongWord;
Description: Implementation of UARTDeviceRead API for PL011 UART
Note Not intended to be called directly by applications, use UARTDeviceRead instead. 


function PL011UARTPushRX(UART:PUARTDevice):LongWord;
Description: To be documented
Note None documented 


function PL011UARTWrite(UART:PUARTDevice; Buffer:Pointer; Size,Flags:LongWord; var Count:LongWord):LongWord;
Description: Implementation of UARTDeviceWrite API for PL011 UART
Note Not intended to be called directly by applications, use UARTDeviceWrite instead. 


function PL011UARTGetStatus(UART:PUARTDevice):LongWord;
Description: Implementation of UARTDeviceGetStatus API for PL011 UART
Note Not intended to be called directly by applications, use UARTDeviceGetStatus instead. 


function PL011UARTSetStatus(UART:PUARTDevice; Status:LongWord):LongWord;
Description: Implementation of UARTDeviceSetStatus API for PL011 UART
Note Not intended to be called directly by applications, use UARTDeviceSetStatus instead. 


procedure PL011UARTInterruptHandler(UART:PUARTDevice);
Description: Interrupt handler for the PL011 UART device
Note Not intended to be called directly by applications 


procedure PL011UARTReceive(UART:PUARTDevice);
Description: Receive handler for the PL011 UART device
Note Not intended to be called directly by applications 


procedure PL011UARTTransmit(UART:PUARTDevice);
Description: Transmit handler for the PL011 UART device
Note Not intended to be called directly by applications 


procedure PL011UARTEnableInterrupt(UART:PPL011UART; Interrupt:LongWord);
Description: Enable the specified interrupt in the interrupt mask register of a PL011 UART device
UART The PL011 UART device to enable the interrupt for
Interrupt The interrupt to enable
Note Caller must hold the UART lock 


procedure PL011UARTDisableInterrupt(UART:PPL011UART; Interrupt:LongWord);
Description: Disable the specified interrupt in the interrupt mask register of a PL011 UART device
Network The PL011 UART device to disable the interrupt for
Interrupt The interrupt to disable
Note Caller must hold the UART lock


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