dma.c

renesas m16c DMA data access sample the whole project is tested in HEW,and works corectly.

/*********************************************************************/
/*    FILE NAME : rjj05b0218_src.c                                   */
/*    Ver       : 1.10                                               */
/*    CPU       : M16C/62                                            */
/*    FUNCTION  : The DMA setting procedure in the C language.       */
/*-------------------------------------------------------------------*/
/*    Copyright(C)2003, Renesas Technology Corp.                     */
/*    Copyright(C)2003, Renesas Solutions Corp.                      */
/*    All rights reserved.                                           */
/*                                                                   */
/*********************************************************************/
/****************************************/
/*    include file                      */
/****************************************/
#include "sfr62P.h"             // Special Function Register Header File

/****************************************/
/*    Function declaration              */
/****************************************/
void ta1_init(void);
void dma0_int(void);

/****************************************/
/*    Global variable declaration       */
/****************************************/
static char data0[] = {0x1,0x3,0x7,0xf,0x1f,0x3f,0x7f,0xff};

/****************************************/
/*    main function                     */
/****************************************/
void main(void)
{
    pd0  = 0xff;                // P0 is an output port.
    pd6  = 0xff;                // P6 is an output port.
    pd8  = 0x1f;                // P8_0-P8_4 output
    p0   = 0;                   // 
    p6   = 0;                   // 
    p8   = 0;                   // 
	
    ta1_init();                 // 

    dm0sl  = 0x03;              // (1) A setup of DM0SL(TA1)
    dm0con = 0x13;              // (2) A setup of DM0CON
                                //    DMA0 inhibit,8bit,repeat,fixed->forward)

                                // (3) A setup of SAR0(DMA0 source pointer)
    sar0_addr.byte.low  = (char)(&data0);
    sar0_addr.byte.mid  = (char)((unsigned long)(&data0) >> 8);
    sar0_addr.byte.high = (char)((unsigned long)(&data0) >> 16);
                                // (4) A setup of DAR0(DMA0 destination pointer)
    dar0_addr.byte.low  = (char)(&p0);
    dar0_addr.byte.mid  = (char)((unsigned long)(&p0) >> 8);
    dar0_addr.byte.high = (char)((unsigned long)(&p0) >> 16);
    tcr0   = 0x07;              // (5) A setup of TCR0(DMA0 transfer count)
    dm0ic  = 0x04;              // (6) A setup of DM0IC(DMA0 interrupt control register)
    dm0con = 0x1B;              // (7) A setup of DM0CON
                                //    DMA0 permission,8bit,repeat,fixed->forward)
	
    asm("fset I");              // (8) Interruption permission.
	
    tabsr = 0x02;               // (9) Operation of the circumference function of a DMA demand factor is permitted.
	
    while(1)
    {
        p8_1 = !p8_1;           // test end.
    }
}

/****************************************/
/*    Timer-A1 initialization           */
/****************************************/
void ta1_init(void)
{
    ta1mr = 0x80;               // Timer-mode(f32)
    ta1   = 0x8fff;             // Timer value setup

}


/****************************************/
/*    DMA0 interrupt routine            */
/****************************************/
#pragma	INTERRUPT/B  dma0_int
void dma0_int(void)
{
    p6_0 = !p6_0;               // 

}