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Implement Read() and Poll() 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6294 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
mdkinney 2008-10-30 05:30:00 +00:00
parent 34c4ae475d
commit 7829726671
1 changed files with 110 additions and 48 deletions
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130
DuetPkg/Library/DuetSerialIoLib/SerialPortLib.c
View File

@ -1,7 +1,7 @@
/** @file
Serial I/O Port library functions with no library constructor/destructor
UART Serial Port library instance with empty functions.
Copyright (c) 2006, Intel Corporation
Copyright (c) 2006 - 2008, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@ -12,11 +12,10 @@
**/
#include <Base.h>
#include <Library/IoLib.h>
#include <Library/SerialPortLib.h>
#include <Library/IoLib.h>
//---------------------------------------------
// UART Register Offsets
@ -42,17 +41,25 @@
#define LSR_RXDA 0x01
#define DLAB 0x01
UINT16 gComBase = 0x3f8;
//---------------------------------------------
// UART Settings
//---------------------------------------------
UINT16 gUartBase = 0x3F8;
UINTN gBps = 115200;
UINT8 gData = 8;
UINT8 gStop = 1;
UINT8 gParity = 0;
UINT8 gBreakSet = 0;
/*
Programmed hardware of Serial port.
/**
Initialize the serial device hardware.
@return Always return EFI_UNSUPPORTED.
If no initialization is required, then return RETURN_SUCCESS.
If the serial device was successfuly initialized, then return RETURN_SUCCESS.
If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
@retval RETURN_SUCCESS The serial device was initialized.
@retval RETURN_DEVICE_ERROR The serail device could not be initialized.
**/
RETURN_STATUS
@ -78,32 +85,41 @@ SerialPortInitialize (
//
// Set communications format
//
OutputData = (UINT8)((DLAB << 7) | ((gBreakSet << 6) | ((gParity << 3) | ((gStop << 2) | Data))));
IoWrite8 (gComBase + LCR_OFFSET, OutputData);
OutputData = (UINT8) ((DLAB << 7) | (gBreakSet << 6) | (gParity << 3) | (gStop << 2) | Data);
IoWrite8 ((UINTN) (gUartBase + LCR_OFFSET), OutputData);
//
// Configure baud rate
//
IoWrite8 (gComBase + BAUD_HIGH_OFFSET, (UINT8)(Divisor >> 8));
IoWrite8 (gComBase + BAUD_LOW_OFFSET, (UINT8)(Divisor & 0xff));
IoWrite8 ((UINTN) (gUartBase + BAUD_HIGH_OFFSET), (UINT8) (Divisor >> 8));
IoWrite8 ((UINTN) (gUartBase + BAUD_LOW_OFFSET), (UINT8) (Divisor & 0xff));
//
// Switch back to bank 0
//
OutputData = (UINT8)((~DLAB<<7)|((gBreakSet<<6)|((gParity<<3)|((gStop<<2)| Data))));
IoWrite8 (gComBase + LCR_OFFSET, OutputData);
OutputData = (UINT8) ((~DLAB << 7) | (gBreakSet << 6) | (gParity << 3) | (gStop << 2) | Data);
IoWrite8 ((UINTN) (gUartBase + LCR_OFFSET), OutputData);
return RETURN_SUCCESS;
}
/**
Write data to serial device.
Write data from buffer to serial device.
@param Buffer Point of data buffer which need to be writed.
@param NumberOfBytes Number of output bytes which are cached in Buffer.
Writes NumberOfBytes data bytes from Buffer to the serial device.
The number of bytes actually written to the serial device is returned.
If the return value is less than NumberOfBytes, then the write operation failed.
@retval 0 Write data failed.
@retval !0 Actual number of bytes writed to serial device.
If Buffer is NULL, then ASSERT().
If NumberOfBytes is zero, then return 0.
@param Buffer Pointer to the data buffer to be written.
@param NumberOfBytes Number of bytes to written to the serial device.
@retval 0 NumberOfBytes is 0.
@retval >0 The number of bytes written to the serial device.
If this value is less than NumberOfBytes, then the read operation failed.
**/
UINTN
@ -116,6 +132,47 @@ SerialPortWrite (
UINTN Result;
UINT8 Data;
if (Buffer == NULL) {
return 0;
}
Result = NumberOfBytes;
while (NumberOfBytes--) {
//
// Wait for the serail port to be ready.
//
do {
Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
} while ((Data & LSR_TXRDY) == 0);
IoWrite8 ((UINT16) gUartBase, *Buffer++);
}
return Result;
}
/**
Reads data from a serial device into a buffer.
@param Buffer Pointer to the data buffer to store the data read from the serial device.
@param NumberOfBytes Number of bytes to read from the serial device.
@retval 0 NumberOfBytes is 0.
@retval >0 The number of bytes read from the serial device.
If this value is less than NumberOfBytes, then the read operation failed.
**/
UINTN
EFIAPI
SerialPortRead (
OUT UINT8 *Buffer,
IN UINTN NumberOfBytes
)
{
UINTN Result;
UINT8 Data;
if (NULL == Buffer) {
return 0;
}
@ -127,34 +184,39 @@ SerialPortWrite (
// Wait for the serail port to be ready.
//
do {
Data = IoRead8 (gComBase + LSR_OFFSET);
} while ((Data & LSR_TXRDY) == 0);
Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
} while ((Data & LSR_RXDA) == 0);
IoWrite8 (gComBase, *Buffer++);
*Buffer++ = IoRead8 ((UINT16) gUartBase);
}
return Result;
}
/**
Read data from serial device and save the datas in buffer.
Polls a serial device to see if there is any data waiting to be read.
@param Buffer Point of data buffer which need to be writed.
@param NumberOfBytes Number of output bytes which are cached in Buffer.
Polls aserial device to see if there is any data waiting to be read.
If there is data waiting to be read from the serial device, then TRUE is returned.
If there is no data waiting to be read from the serial device, then FALSE is returned.
@retval 0 Read data failed.
@retval !0 Aactual number of bytes read from serial device.
@retval TRUE Data is waiting to be read from the serial device.
@retval FALSE There is no data waiting to be read from the serial device.
**/
UINTN
BOOLEAN
EFIAPI
SerialPortRead (
OUT UINT8 *Buffer,
IN UINTN NumberOfBytes
SerialPortPoll (
VOID
)
{
return 0;
UINT8 Data;
//
// Read the serial port status.
//
Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
return (BOOLEAN) ((Data & LSR_RXDA) != 0);
}