mirror of https://github.com/acidanthera/audk.git
Implement Read() and Poll()
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6294 6f19259b-4bc3-4df7-8a09-765794883524
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mdkinney
parent
34c4ae475d
commit
7829726671
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@ -1,7 +1,7 @@
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/** @file
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Serial I/O Port library functions with no library constructor/destructor
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UART Serial Port library instance with empty functions.
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Copyright (c) 2006, Intel Corporation
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Copyright (c) 2006 - 2008, Intel Corporation
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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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@ -12,11 +12,10 @@
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**/
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#include <Base.h>
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#include <Library/IoLib.h>
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#include <Library/SerialPortLib.h>
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#include <Library/IoLib.h>
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//---------------------------------------------
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// UART Register Offsets
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@ -42,17 +41,25 @@
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#define LSR_RXDA 0x01
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#define DLAB 0x01
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UINT16 gComBase = 0x3f8;
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UINTN gBps = 115200;
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UINT8 gData = 8;
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UINT8 gStop = 1;
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UINT8 gParity = 0;
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//---------------------------------------------
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// UART Settings
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//---------------------------------------------
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UINT16 gUartBase = 0x3F8;
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UINTN gBps = 115200;
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UINT8 gData = 8;
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UINT8 gStop = 1;
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UINT8 gParity = 0;
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UINT8 gBreakSet = 0;
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/*
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Programmed hardware of Serial port.
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/**
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Initialize the serial device hardware.
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@return Always return EFI_UNSUPPORTED.
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If no initialization is required, then return RETURN_SUCCESS.
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If the serial device was successfuly initialized, then return RETURN_SUCCESS.
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If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
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@retval RETURN_SUCCESS The serial device was initialized.
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@retval RETURN_DEVICE_ERROR The serail device could not be initialized.
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**/
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RETURN_STATUS
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@ -61,14 +68,14 @@ SerialPortInitialize (
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VOID
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)
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{
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UINTN Divisor;
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UINT8 OutputData;
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UINT8 Data;
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UINTN Divisor;
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UINT8 OutputData;
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UINT8 Data;
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//
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//
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// Map 5..8 to 0..3
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//
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Data = (UINT8) (gData - (UINT8)5);
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Data = (UINT8) (gData - (UINT8) 5);
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//
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// Calculate divisor for baud generator
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@ -78,32 +85,41 @@ SerialPortInitialize (
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//
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// Set communications format
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//
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OutputData = (UINT8)((DLAB << 7) | ((gBreakSet << 6) | ((gParity << 3) | ((gStop << 2) | Data))));
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IoWrite8 (gComBase + LCR_OFFSET, OutputData);
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OutputData = (UINT8) ((DLAB << 7) | (gBreakSet << 6) | (gParity << 3) | (gStop << 2) | Data);
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IoWrite8 ((UINTN) (gUartBase + LCR_OFFSET), OutputData);
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//
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// Configure baud rate
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//
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IoWrite8 (gComBase + BAUD_HIGH_OFFSET, (UINT8)(Divisor >> 8));
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IoWrite8 (gComBase + BAUD_LOW_OFFSET, (UINT8)(Divisor & 0xff));
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IoWrite8 ((UINTN) (gUartBase + BAUD_HIGH_OFFSET), (UINT8) (Divisor >> 8));
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IoWrite8 ((UINTN) (gUartBase + BAUD_LOW_OFFSET), (UINT8) (Divisor & 0xff));
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//
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// Switch back to bank 0
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//
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OutputData = (UINT8)((~DLAB<<7)|((gBreakSet<<6)|((gParity<<3)|((gStop<<2)| Data))));
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IoWrite8 (gComBase + LCR_OFFSET, OutputData);
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OutputData = (UINT8) ((~DLAB << 7) | (gBreakSet << 6) | (gParity << 3) | (gStop << 2) | Data);
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IoWrite8 ((UINTN) (gUartBase + LCR_OFFSET), OutputData);
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return RETURN_SUCCESS;
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}
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/**
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Write data to serial device.
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Write data from buffer 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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Writes NumberOfBytes data bytes from Buffer to the serial device.
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The number of bytes actually written to the serial device is returned.
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If the return value is less than NumberOfBytes, then the write operation failed.
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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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If Buffer is NULL, then ASSERT().
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If NumberOfBytes is zero, then return 0.
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@param Buffer Pointer to the data buffer to be written.
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@param NumberOfBytes Number of bytes to written to the serial device.
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@retval 0 NumberOfBytes is 0.
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@retval >0 The number of bytes written to the serial device.
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If this value is less than NumberOfBytes, then the read operation failed.
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**/
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UINTN
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@ -113,39 +129,38 @@ SerialPortWrite (
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IN UINTN NumberOfBytes
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)
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{
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UINTN Result;
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UINT8 Data;
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UINTN Result;
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UINT8 Data;
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if (NULL == Buffer) {
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if (Buffer == NULL) {
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return 0;
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}
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Result = NumberOfBytes;
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while (NumberOfBytes--) {
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//
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// Wait for the serail port to be ready.
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//
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do {
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Data = IoRead8 (gComBase + LSR_OFFSET);
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} while ((Data & LSR_TXRDY) == 0);
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IoWrite8 (gComBase, *Buffer++);
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//
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// Wait for the serail port to be ready.
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//
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do {
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Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
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} while ((Data & LSR_TXRDY) == 0);
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IoWrite8 ((UINT16) gUartBase, *Buffer++);
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}
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return Result;
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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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Reads data from a serial device into a 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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@param Buffer Pointer to the data buffer to store the data read from the serial device.
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@param NumberOfBytes Number of bytes to read from the serial device.
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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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@retval 0 NumberOfBytes is 0.
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@retval >0 The number of bytes read from the serial device.
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If this value is less than NumberOfBytes, then the read operation failed.
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**/
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UINTN
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@ -155,6 +170,53 @@ SerialPortRead (
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IN UINTN NumberOfBytes
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)
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{
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return 0;
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UINTN Result;
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UINT8 Data;
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if (NULL == Buffer) {
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return 0;
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}
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Result = NumberOfBytes;
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while (NumberOfBytes--) {
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//
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// Wait for the serail port to be ready.
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//
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do {
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Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
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} while ((Data & LSR_RXDA) == 0);
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*Buffer++ = IoRead8 ((UINT16) gUartBase);
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}
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return Result;
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}
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/**
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Polls a serial device to see if there is any data waiting to be read.
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Polls aserial device to see if there is any data waiting to be read.
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If there is data waiting to be read from the serial device, then TRUE is returned.
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If there is no data waiting to be read from the serial device, then FALSE is returned.
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@retval TRUE Data is waiting to be read from the serial device.
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@retval FALSE There is no data waiting to be read from the serial device.
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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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UINT8 Data;
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//
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// Read the serial port status.
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//
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Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
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return (BOOLEAN) ((Data & LSR_RXDA) != 0);
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}
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