uart.c

samsung 2410 demo源代码

//====================================================================
// File Name : rtc.c
// Function  : S3C2413 RTC Test Program
// Date      : Sep. 27, 2005
// Version   : 0.0
// History
//   0.0 : Programming start (Sep. 27, 2005)
//====================================================================


#include <stdio.h>
#include <stdlib.h>

#include "2413addr.h"
#include "System.h"
#include "Exception.h"
#include "Console.h"
#include "def.h"
#include "Uart.h"

#define NP	0	// No Parity
#define OP	4	// Odd Parity
#define EP	5	// Even Parity
#define PF1	6	// Parity force 1
#define PF0	7	// Parity force 0

typedef struct tagUART
{
    volatile U32 ULCON;		//0x0
    volatile U32 UCON;		//0x4
    volatile U32 UFCON;		//0x8
    volatile U32 UMCON;		//0xc
    volatile U32 UTRSTAT;    //0x10	Read Only
    volatile U32 UERSTAT;    //0x14	Read Only
    volatile U32 UFSTAT;      //0x18	Read Only
    volatile U32 UMSTAT;     //0x1c	Read Only
    volatile U32 UTXH;	      //0x20	Write Only
    volatile U32 URXH;	      //0x24	Read Only
    volatile U32 UBRDIV;      //0x28
    volatile U32 UDIVSLOT;  //0x2c
}UART;

UART *pUART;

const unsigned int nSlotTable[16] = {0x0000, 0x0080, 0x0808, 0x0888, 0x2222, 0x4924, 0x4a52, 0x54aa,
				     				0x5555, 0xd555, 0xd5d5, 0xddd5, 0xdddd, 0xdfdd, 0xdfdf, 0xffdf};

U32 saved_rGPHCON, saved_rGPHDAT, saved_rGPHDN;
U32 saved_ULCON, saved_UCON, saved_UFCON, saved_UMCON, saved_UBRDIV, saved_UDIVSLOT;

static S8 TestString[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890->UART0 Tx interrupt test is First!!!!\rABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890->UART0 Tx interrupt test is Second!!!!\rABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890->UART0 Tx interrupt test is Third!!!!\r\n";	

volatile S8 *uartTxStr, *uartRxStr;

void * uart_func[][2]=
{
	(void *)Uart_Intrrupt_Tx_Fifo,			"Uart Interrupt Tx FIFO",
	0,0
};

void Ch10_UART(void)
{
	int i=0;
	
	while(1) {
		printf("\n");
		while(1) {   //display menu
		    	printf("%2d:%s",i,uart_func[i][1]);
		    	i++;
	    		if((int)(uart_func[i][0])==0) {
				printf("\n");
				break;
		    	}
		    	if((i%4)==0) printf("\n");
		}
		printf("\nSelect(-1 to exit): ");
		i = GetIntNum();

		if(i==-1) break;

		if(i>=0 && (i<(sizeof(uart_func)/4)) ) 
	    	( (void (*)(void)) (uart_func[i][0]) )();	// execute selected function.
	}
}

void Uart_Intrrupt_Tx_Fifo(void)
{
	Uart_Port_Init();		// GPIO port init.
	Uart_Select(0);

	uartTxStr=TestString;	// Tx Data Init.

	Uart_Line_Set(NP,1,8);	// No Parity, One stop bit, Data 8 bit
	Uart_Baud_Rate_Set(115200);
#if 0
	
	Uart_Select(0);
	pUART->UCON = (0x1<<9);					// Tx = Level
	
	Uart_Baud_Rate_Set();
	Uart_Mode_Set(INTORPOL,DISABLE);

	pUART->UFCON = (2<<6)|(1<<4)|(3<<1)|(1);	// Fifo Clear, Fifo Enable
	pUART->UMCON = (0<<4);					// AFC Disable

	pISR_UART0 = (U32)UART0_Tx_ISR;
	
	rINTMSK &= ~(BIT_UART0);
	rINTSUBMSK &= ~(BIT_SUB_TXD0);
	
	TxDone=1;
	while(TxDone);
	while(pUART->UTRSTAT!=0x6);

	rINTMSK &= ~(BIT_UART0);
	rINTSUBMSK &= ~(BIT_SUB_TXD0);

#endif
	Uart_Port_Return(0);
}

void Uart_Baud_Rate_Set(U32 bps)
{
	int DIV_VAL, nSlot;
	int UClk;
	float tempDiv;

	switch((pUART->UCON >>10)&0x3) {
		case 0:
		case 2:
			SystemCLK();
			UClk=PCLK;
			break;
		case 1:
			printf("UEXTCLK must be set\n");	while(1);
			break;
		case 3:
			SystemCLK();
			UClk=UARTCLK;
			break;
		}

	DIV_VAL = ( (int)(UClk/16./bps+0.5) -1 );   //Baud rate divisior
	nSlot = (int)((DIV_VAL - (int)DIV_VAL) * 16);

	pUART->UBRDIV = DIV_VAL;
	pUART->UDIVSLOT = nSlotTable[nSlot];
}

void Uart_Line_Set(U32 ParityMode, U32 StopBitNum, U32 DataBitNum)
{
	pUART->ULCON = 0;
	pUART->ULCON = (ParityMode<<3)|((StopBitNum-1)<<2)|(DataBitNum-5);
}

void Uart_Port_Init(void)
{
	saved_rGPHCON=rGPHCON;			// GPIO Configuration Backup
	saved_rGPHDAT=rGPHDAT;
	saved_rGPHDN=rGPHDN;

	rGPHCON = (rGPHCON&~(0xfff))|(0xaaa);	// GPIO -> RXD 0,1,2 TXD 0,1,2
	rGPHDN = 0x7fff;						// Pull-down Disable
	printf("Uart Port Init\n");
}

void Uart_Select(U32 ch)
{
	switch(ch) {
		case 0:
			pUART = (void *)(0x50000000);
			printf("Uart0 is selected\n");
			break;
		case 1:
			pUART = (void *)(0x50004000);
			printf("Uart1 is selected\n");
			break;
		case 2:
			pUART = (void *)(0x50008000);
			printf("Uart2 is selected\n");
			break;
		default:
			printf("[Error] Select Uart\n");
			while(1);
		}

	if(ch==1) {	// Uart1 Configuration backup for DNW Monitoring
		saved_ULCON = pUART->ULCON;
		saved_UCON = pUART->UCON;
		saved_UFCON = pUART->UFCON;
		saved_UMCON = pUART->UMCON;
		saved_UBRDIV = pUART->UBRDIV;
		saved_UDIVSLOT = pUART->UDIVSLOT;
		}
}

void Uart_Port_Return(U32 ch)
{
	rGPHCON=saved_rGPHCON;	// GPIO Configuration Recovery
	rGPHDAT=saved_rGPHDAT;
	rGPHDN=saved_rGPHDN;

	if(ch==1) {	// Uart1 Configuration recovery for DNW Monitoring
		 pUART->ULCON = saved_ULCON;
		 pUART->UCON = saved_UCON;
		 pUART->UFCON = saved_UFCON;
		 pUART->UMCON = saved_UMCON;
		 pUART->UBRDIV = saved_UBRDIV;
		 pUART->UDIVSLOT = saved_UDIVSLOT;
		}
}