dma.c

S3C2410底层keil版--UART

/*********************************************************************************************
* File：	main.c
* Author:	embest
* Desc：	c main entry
* History:	
*********************************************************************************************/

/*------------------------------------------------------------------------------------------*/
/*                                     includes files	                                    */
/*------------------------------------------------------------------------------------------*/
#include "2410lib.h"
#include "head.h"


INT8U  isDone;


void __irq Uart0_TxDmaDone(void)
{
    rDMASKTRIG0=0x0;	// Stop Dma0
    isDone=0;
    rINTMSK |= BIT_DMA0;
    ClearPending(BIT_DMA0);
}

init_uart()
{
    /*********** UART0 Tx test with DMA0 ***********/ 
    INT8U uart0TxStr[] = {"ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890->UART0 Tx Test by DMA0 is good!!!!\r\n"};
    uart_printf("\n[Uart channel 0 DMA0 Tx Test]\n");
    isDone=1;
   

    rULCON0 = (0<<6)|(0<<3)|(0<<2)|(3);	// Normal,No parity,One stop bit, 8bit
    rUCON0 &= 0x400;	// For the PCLK <-> UCLK fuction    
    rUCON0 |= (1<<9)|(1<<8)|(0<<7)|(0<<6)|(0<<5)|(0<<4)|(2<<2)|(0);
    //Clock,Tx:Def,Rx:Def,Rx timeout:x,Rx error int:x,Loop-back:x,Send break:x,Tx:dma0,Rx:x

    /***DMA0 init***/
    rDISRC0 = (INT32U)uart0TxStr;	// Start address
    rDISRCC0= (0<<1)|(0);		// AHB,Increment
    rDIDST0 = (INT32U)UTXH0;			// Memory buffer Address
    rDIDSTC0= (1<<1)|(1);		// APB,Fixed
    rDCON0  = (0x80000000)|(0<<30)|(1<<29)|(0<<28)|(0<<27)|(1<<24)|(1<<23)|(1<<22)|(0<<20)|strlen((char*)uart0TxStr);
    //handshake, sync PCLK, TC int, single tx, single service, Uart0, H/W request,auto-reload off, Byte size Tx, Tx count value
    rINTMSK =~(BIT_DMA0);
    rDMASKTRIG0 = (0<<2)|(1<<1)|(0);    //no-stop, DMA0 channel on, no-SW trigger 
	
	 pISR_DMA0  =(INT32U)Uart0_TxDmaDone;
}



void  uart0_dma_test()
{
	init_uart();

    while(isDone);
}