ARM9嵌入式系统设计期末复习

ARM复习

4.1基本IO实验（LED控制）

控制实验平台的发光二极管LED1,LED2,LED3,LED4，使它们有规律的点亮和熄灭，具体顺序如下：LED1 亮->LED2 亮->LED3 亮->LED4 亮->LED1 灭->LED2 灭->LED3 灭->LED4 灭->全亮->全灭，如此反复。

/******************************************************************************* name: * func:

led_on

turn on the leds one by one

******************************************************************************/ void led_on(void) { }

/******************************************************************************* name: * func:

led_off

turn off the leds one by one

int i,nOut; nOut = 0xF0;

rGPFDAT = nOut & 0x70; for(i=0;i<100000;i++); rGPFDAT=nOut & 0x30; for(i=0;i<100000;i++); rGPFDAT=nOut & 0x10; for(i=0;i<100000;i++); rGPFDAT=nOut & 0x00; for(i=0;i<100000;i++);

******************************************************************************/ void led_off(void) {

int i,nOut; nOut=0;

1

}

rGPFDAT = 0;

for(i=0;i<100000;i++); rGPFDAT = nOut | 0x80; for(i=0;i<100000;i++); rGPFDAT |= nOut | 0x40; for(i=0;i<100000;i++); rGPFDAT |= nOut | 0x20; for(i=0;i<100000;i++); rGPFDAT |= nOut | 0x10; for(i=0;i<100000;i++);

/******************************************************************************* name: * func:

led_on_off

turn on the 4 leds and then turn off the 4 leds

******************************************************************************/void led_on_off(void) { }

/******************************************************************************* name: * func:

led_test

i/o control test(led)

int i; rGPFDAT=0;

for(i=0;i<100000;i++); rGPFDAT=0xF0;

for(i=0;i<100000;i++);

******************************************************************************/void led_test(void) {

rGPFCON=0x5500;

2

// PORTF7/6/5/4 OUTPUT

rGPFUP=0;

// PULL-UP ENABLE

// beep configuration

//rGPBCON = rGPBCON & 0xFFFFFC|1;

uart_printf(\//rGPBDAT &= 0xFFFFFE; led_on(); led_off();

led_on_off(); //rGPBDAT |= 1; delay(1000); rGPFCON = 0x55aa;

//GPF1,GPF0=10 :EINT1,EINT0,(2410lib.c)

uart_printf(\}

中 断 实 验

通过UART0 选择中断触发方式，使能外部中断Eint0、Eint11； 1. 中断初始化程序

/*********************************************************** * name: int_init

* func: Interrupt initialize * comment:

* EINT0 --- SB202 EINT11 --- SB203

************************************************************/ void int_init(void) //中断初始函数 {

rSRCPND = rSRCPND; // clear all interrupt rINTPND = rINTPND; // clear all interrupt rGPFCON = (rGPFCON & 0xffcc) | (1<<5) | (1<<1); // PF0/2 = EINT0/2

rGPGCON = (rGPGCON & 0xff3fff3f) | (1<<23) | (1<<7); // PG3/11 = EINT11/19

pISR_EINT0 = (UINT32T)int0_int; // isrEINT0; pISR_EINT8_23 = (UINT32T)int11_int; // isrEINT11_19;

3

rEINTPEND = 0xffffff;

rSRCPND = BIT_EINT0 | BIT_EINT8_23; //to clear the previous pending states rINTPND = BIT_EINT0 | BIT_EINT8_23;

rEXTINT0 = (rEXTINT0 & ~((7<<8) | (0x7<<0))) | 0x2<<8 | 0x2<<0; rEXTINT1 = (rEXTINT1 & ~(7<<12)) | 0x2<<12; rEINTMASK &= ~(1<<11);

rINTMSK &= ~(BIT_EINT0 | BIT_EINT8_23); }

/***************************************************************** * name: int_test

* func: Extern interrupt test * comment:

* EINT0 --- SB202 EINT11 --- SB203

*******************************************************************/ void int_test(void) //中断测试函数 {

int nIntMode;

uart_printf(\

uart_printf(\

5.B-EDGE\\n\

uart_printf(%uart_printf(%uart_printf(\

int_init();

g_nKeyPress = 3;

// only 3 times test (for board test) while(g_nKeyPress&(g_nKeyPress<6)) // SB1202/SB1203 to exit board test {

4

nIntMode = uart_getkey(); switch(nIntMode) {

case '1':

uart_printf(\

// EINT0/2=low level triggered,EINT11=low level triggered rEXTINT0 = (rEXTINT0 & ~((7<<8) |(0x7<<0)))|0x0<<8 | 0x0<<0; rEXTINT1 = (rEXTINT1 & ~(7<<12)) | 0x0<<12; break; case '2':

uart_printf(\

// EINT0/2=high level triggered,EINT11=high level triggered rEXTINT0 = (rEXTINT0 & ~((7<<8)|(0x7<<0))) | 0x1<<8 | 0x1<<0; rEXTINT1 = (rEXTINT1 & ~(7<<12)) | 0x1<<12; break; case '3':

uart_printf(\

// EINT0/2=falling edge triggered, EINT11=falling edge triggered rEXTINT0 = (rEXTINT0 & ~((7<<8) | (0x7<<0))) | 0x2<<8 | 0x2<<0; rEXTINT1 = (rEXTINT1 & ~(7<<12)) | 0x2<<12; break; case '4':

uart_printf(\

// EINT0/2=rising edge triggered,EINT11=rising edge triggered rEXTINT0 = (rEXTINT0 & ~((7<<8) | (0x7<<0))) | 0x4<<8 | 0x4<<0; rEXTINT1 = (rEXTINT1 & ~(7<<12)) | 0x4<<12; break; case '5':

uart_printf(\

// EINT0/2=both edge triggered,EINT11=both edge triggered

5