2ef2b01e07
ArmPkg - Supoprt for ARM specific things that can change as the architecture changes. Plus semihosting JTAG drivers. EmbeddedPkg - Generic support for an embeddded platform. Including a light weight command line shell. BeagleBoardPkg - Platform specifics for BeagleBoard. SD Card works, but USB has issues. Looks like a bug in the open source USB stack (Our internal stack works fine). git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9518 6f19259b-4bc3-4df7-8a09-765794883524
146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
/** @file
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Serial I/O Port library functions with no library constructor/destructor
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Copyright (c) 2008-2009, Apple Inc. All rights reserved.
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.h>
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#include <Library/DebugLib.h>
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#include <Library/SemihostLib.h>
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#include <Library/SerialPortLib.h>
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/*
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Programmed hardware of Serial port.
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@return Always return EFI_UNSUPPORTED.
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**/
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RETURN_STATUS
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EFIAPI
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SerialPortInitialize (
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VOID
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)
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{
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if (SemihostConnectionSupported ()) {
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return RETURN_SUCCESS;
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} else {
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return RETURN_UNSUPPORTED;
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}
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}
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/**
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Write data to serial device.
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@param Buffer Point of data buffer which need to be writed.
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@param NumberOfBytes Number of output bytes which are cached in Buffer.
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@retval 0 Write data failed.
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@retval !0 Actual number of bytes writed to serial device.
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**/
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#define PRINT_BUFFER_SIZE 512
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#define PRINT_BUFFER_THRESHOLD (PRINT_BUFFER_SIZE - 4)
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UINTN
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EFIAPI
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SerialPortWrite (
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IN UINT8 *Buffer,
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IN UINTN NumberOfBytes
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)
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{
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UINT8 PrintBuffer[PRINT_BUFFER_SIZE];
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UINTN SourceIndex = 0;
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UINTN DestinationIndex = 0;
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UINT8 CurrentCharacter;
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while (SourceIndex < NumberOfBytes)
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{
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CurrentCharacter = Buffer[SourceIndex++];
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switch (CurrentCharacter)
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{
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case '\r':
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continue;
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case '\n':
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PrintBuffer[DestinationIndex++] = ' ';
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// fall through
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default:
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PrintBuffer[DestinationIndex++] = CurrentCharacter;
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break;
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}
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if (DestinationIndex > PRINT_BUFFER_THRESHOLD)
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{
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PrintBuffer[DestinationIndex] = '\0';
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SemihostWriteString ((CHAR8 *) PrintBuffer);
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DestinationIndex = 0;
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}
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}
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if (DestinationIndex > 0)
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{
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PrintBuffer[DestinationIndex] = '\0';
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SemihostWriteString ((CHAR8 *) PrintBuffer);
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}
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return 0;
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}
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/**
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Read data from serial device and save the datas in buffer.
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@param Buffer Point of data buffer which need to be writed.
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@param NumberOfBytes Number of output bytes which are cached in Buffer.
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@retval 0 Read data failed.
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@retval !0 Aactual number of bytes read from serial device.
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**/
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UINTN
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EFIAPI
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SerialPortRead (
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OUT UINT8 *Buffer,
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IN UINTN NumberOfBytes
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)
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{
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*Buffer = SemihostReadCharacter ();
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return 1;
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}
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/**
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Check to see if any data is avaiable to be read from the debug device.
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@retval TRUE At least one byte of data is avaiable to be read
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@retval FALS No data is avaiable to be read
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**/
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BOOLEAN
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EFIAPI
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SerialPortPoll (
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VOID
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)
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{
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// Since SemiHosting read character is blocking always say we have a char ready?
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return SemihostConnectionSupported ();
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}
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