Renesas Single-Chip Microcomputer M38C89T-ADF Uživatelský manuál stáhnout pdf (Strana 118)

5-2

4BUsage Examples

5.1 21BInterrupt control

5.1. Interrupt control

Figure 5-1 shows an example of external interrupt use.

Pin IRQ0-A is used to detect a falling edge and generates an interrupt.

Pin IRQ1-B is used to detect a falling edge and is polled.

IRQ2-A

is used to detect a low-level signal and generates an interrupt. Further interrupts are prevented until the signal has

returned to the high level.

#include "r_pdl_io_port_library_SH7267.h"

#include "r_pdl_intc_library_SH7267.h"

#include "r_pdl_cmt_library_SH7267.h"

#include "r_pdl_cpg_library_SH7267.h"

/* PDL device-specific definitions */

#include "r_pdl_definitions.h"

volatile uint8_t switch_sw1_pressed;

volatile uint8_t irq2_low;

/* Callback function prototypes */

void IRQ0Handler(void);

void IRQ2Handler(void);

static void ReEnableIRQ2(void);

void main(void)

{

uint8_t irq_status;

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

R_INTC_Write(

PDL_INTC_REG_IPR,

0x0000

);

/* Configure the IRQ0 interrupt on pin IRQ0-A */

R_INTC_CreateExtInterrupt(

PDL_INTC_IRQ0,

PDL_INTC_IRQ_FALLING | PDL_INTC_A,7,

IRQ0Handler

);

/* Configure the IRQ1 interrupt on pin IRQ1-B */

R_INTC_CreateExtInterrupt(

PDL_INTC_IRQ1,

PDL_INTC_IRQ_FALLING | PDL_INTC_B,

PDL_NA

);

/* Configure the IRQ2 interrupt on pin IRQ2-A */

R_INTC_CreateExtInterrupt(

PDL_INTC_IRQ2,

PDL_INTC_IRQ_LOW | PDL_INTC_A,

IRQ2Handler

);

irq2_low = 0;

while(1)

{

/* Poll the IRQ1 flag */

R_INTC_GetExtInterruptStatus(

PDL_INTC_IRQ1,

&irq_status

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