Renesas Single-Chip Microcomputer M38C89T-ADF Bedienungsanleitung PDF herunterladen (Seite 123)

5-7

Rev.1.00 May 22 2012

REJ09B0566

4BUsage Examples

5.4 24BDMA controller

5.4. DMA controller

Figure 5-4 shows an example of DMAC usage.

Channel 0 will copy the string “Renesas SH7267” into the destination area when a falling edge occurs on pin IRQ3-B.

Channel 1 will copy the string “Hello, World” into the destination area as soon as it is enabled.

/* PDL functions and definitions */

#include “r_pdl_dmac.h”

#include “r_pdl_cpg.h”

#include “r_pdl_intc.h”

/* PDL device-specific definitions */

#include “r_pdl_definitions.h”

/* Required for this example */

#include <string.h>

/* Callback function prototype */

void DMAC0_transfer_end_handler(void);

/* Data source and destination declarations */

const uint8_t source_string_1[]="Renesas SH7267";

const uint8_t source_string_2[]="Hello, World";

volatile uint8_t destination_string_1[]=".......................";

volatile uint8_t destination_string_2[]=".......................";

void main(void)

{

uint16_t StatusValue;

uint32_t SourceAddr;

uint32_t DestAddr;

uint32_t ByteCount;

/* Initialise the system clocks */

R_CPG_Set(

12.5E6,

100E6,

50E6,

25E6,

PDL_CGC_BCLK_DISABLE

);

/* Set the CPU’s Interrupt Priority Level to 0 */

R_INTC_Write(

PDL_INTC_REG_IPL,

);

/* Enable control of LED0 */

R_IO_PORT_Set(

PDL_IO_PORT_3_4,

PDL_IO_PORT_OUTPUT,

);

/* Configure channel 0 */

R_DMAC_Create(

PDL_DMAC_CONSECUTIVE | PDL_DMAC_SOURCE_ADDRESS_PLUS | \

PDL_DMAC_DESTINATION_ADDRESS_PLUS,

PDL_DMAC_REQUEST_IRQ3,

source_string_1,

1 2 ... 118 119 120 121 122 123 124 125 126 127 128 ... 137 138

Kommentare zu diesen Handbüchern

Keine Kommentare

Renesas Single-Chip Microcomputer M38C89T-ADF Bedienungsanleitung Seite 123

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Vernetzung Renesas Single-Chip Microcomputer M38C89T-ADF