80X86 MULTI-TASKING OPERATION SYSTEM: uart2.c Source File

00001 /******************* 
00002 *Project: 80X86 32BIT MULTI TASKING OPERATING SYSTEM
00003 *Description:driver for com 2 using PC16650D
00004 *
00005 *File:uart2.c (I want com2.c,but xp doesn't allow.)
00006 *Author: Book Chen
00007 *Date: 2010.01.01
00008 ********************
00009 */
00010 #include "includes.h"
00011 
00012 const U8 Uart2Name[]="UART2";
00013 UART2_CONTROL Uart2Ctrl;
00014 
00015 void Uart2Init(void){
00016     PicIrqDisable(IRQ3_COM2);
00017     Uart2Ctrl.HasData=false;
00018     Uart2Ctrl.RxData=0;
00019     OutByte((U32)(COM2_BASE+IER),0x00);  //disable all interrupt
00020     OutByte((U32)(COM2_BASE+LCR),0x80);  //set DLAB=1
00021     OutByte((U32)(COM2_BASE+DLLR),BAUDRATE_38400); // set baudrate - divisor latch low byte
00022     OutByte((U32)(COM2_BASE+DLHR),0x00); //default 0x03 -> 9600 bps
00023     OutByte((U32)(COM2_BASE+LCR),0x03);  //DLAB=0,n.8.1
00024     OutByte((U32)(COM2_BASE+FCR),0x00);  //no use fifo
00025     OutByte((U32)(COM2_BASE+MCR),0x0b);  //turn on /OUT2,/RTS,/DTR.../OUT2 is for interrupt use
00026     OutByte((U32)(COM2_BASE+IER),0x01);  //eanble 
00027     OsEventAdd(&Uart2Ctrl.Uart2Event,&Uart2Name,OS_EVENT_UART2);
00028     InterruptIrqHandlerSet(IRQ3_COM2,Uart2Handler);
00029     PicIrqEnable(IRQ3_COM2);
00030 }
00031 
00032 void Uart2Handler(void){
00033     U8 i;
00034     
00035     i=InByte(COM2_BASE+LSR);
00036     if(i&COM1_LSR_DR){
00037         Uart2Ctrl.RxData=InByte(COM2_BASE+RXREG);
00038         Uart2Ctrl.HasData=true;
00039     }
00040 }
00041 
00042 void Uart2Svc(void){
00043     if(Uart2Ctrl.HasData==true){
00044         Uart2Ctrl.HasData=false;
00045         GuiStringPrint("\nCOM2 RX: ");
00046         GuiU8Print(Uart2Ctrl.RxData);
00047     }
00048 }