实验三：LED呼吸灯实验

实验三：LED呼吸灯实验

内容：利用LPC1114 DevKit开发板或者LPC1114 MASB最小系统板，以LPC1114为处理器，设定时钟频率48MHz，利用定时器和PWM功能实现呼吸灯功能，控制（PIO1_9）引脚上的LED灯的渐亮渐灭的闪烁功能。

1.程序源代码

#include

#include "LPC11xx.h" /* LPC11xx definitions */

#define LED_NUM 8 /* Number of user LEDs */ const unsigned long led_mask[] = {1UL << 0, 1UL << 1, 1UL << 2, 1UL << 3,

1UL << 4, 1UL << 5, 1UL << 6, 1UL << 7 };

extern volatile unsigned int i,s;

/* Import external functions from Serial.c file */

extern void SER_init (void);

/* Import external variables from IRQ.c file */

extern volatile unsigned short AD_last;

extern volatile unsigned char clock_1s;

/* variable to trace in LogicAnalyzer (should not read to often) */

volatile unsigned short AD_dbg;

/*----------------------------------------------------------------------------

Function that initializes ADC

*----------------------------------------------------------------------------*/

void ADC_init (void) {

/* configure PIN GPIO0.11 for AD0 */

LPC_SYSCON->SYSAHBCLKCTRL |= ((1UL << 6) | /* enable clock for GPIO */

(1UL << 16) ); /* enable clock for IOCON */

LPC_IOCON->R_PIO0_11 = (2UL << 0); /* P0.11 is AD0 */ LPC_GPIO0->DIR &= ~(1UL << 11); /* configure GPIO as input */

/* configure ADC */

LPC_SYSCON->PDRUNCFG &= ~(1UL << 4); /* Enable power to ADC block */ LPC_SYSCON->SYSAHBCLKCTRL |= (1UL << 13); /* Enable clock to ADC block */

LPC_ADC->CR = ( 1UL << 0) | /* select AD0 pin */

(23UL << 8) | /* ADC clock is 24MHz/24 */

( 1UL << 21); /* enable ADC */ LPC_ADC->INTEN = ( 1UL << 8); /* global enable interrupt */

NVIC_EnableIRQ(ADC_IRQn); /* enable ADC Interrupt */

}

/*----------------------------------------------------------------------------

Function that initializes LEDs

*----------------------------------------------------------------------------*/

void LED_init(void) {

LPC_SYSCON->SYSAHBCLKCTRL |= (1UL << 6); /* enable clock for GPIO */

/* configure GPIO as output */

LPC_GPIO1->DIR |= 1<<9;

LPC_GPIO1->DATA &= ~(1<<9);

}

/*----------------------------------------------------------------------------

Function that turns on requested LED

*----------------------------------------------------------------------------*/

void LED_Off (void) {

LPC_GPIO1->DATA |= 1<<9;

}

/*----------------------------------------------------------------------------

Function that turns off requested LED

*----------------------------------------------------------------------------*/

void LED_On (void) {

LPC_GPIO1->DATA &= ~(1<<9);

}

/*----------------------------------------------------------------------------

Function that outputs value to LEDs

*----------------------------------------------------------------------------*/

void LED_Out(void) {

if ((LPC_GPIO1->DATA & (1<<9))) {

LED_On ();

} else {

LED_Off();

}

}

void TMR32B0_Init(void)

{

LPC_SYSCON->SYSAHBCLKCTRL|=(1UL<<9);

LPC_TMR32B0->IR =0X1F;

LPC_TMR32B0->PR=0;

LPC_TMR32B0->MCR=3;

LPC_TMR32B0->MR0=SystemCoreClock/20;

LPC_TMR32B0->TCR=0x01;

NVIC_EnableIRQ(TIMER_32_0_IRQn);

}

void TMR16B1_PWM_Init(void)

{

LPC_SYSCON->SYSAHBCLKCTRL |= ((1UL << 6) | /* enable clock for GPIO */

(1UL << 16) ); /* enable clock for IOCON */ LPC_SYSCON->SYSAHBCLKCTRL|=(1UL<<8);

LPC_IOCON->PIO1_9|=0X01;

LPC_TMR16B1->TCR=0X02;

LPC_TMR16B1->PR=0;

LPC_TMR16B1->PWMC=0X01;

LPC_TMR16B1->MCR=0X02<<9;

LPC_TMR16B1->MR3=SystemCoreClock/1000;

LPC_TMR16B1->MR0=LPC_TMR16B1->MR3*(3/4);

LPC_TMR16B1->TCR=0X01;

}

/*----------------------------------------------------------------------------

MAIN function

*----------------------------------------------------------------------------*/

int main (void) {

TMR16B1_PWM_Init();

// LED_init();

//TMR32B0_Init();

while (1)

{

}

}

2.总结

经过前两个实验的教训，这次实验预习得比较充分，在按照课本上得语句写上去时，感觉信息慢慢，但是就是调试不出程序，呼吸灯也没有按照预想的那样发亮，在实验课上弄了很久，都没有弄出来，连续弄了几次，实验课就这样过了，感觉自己这次很失败。后来才发现是书上有一跳语句有错误，经过同学的纠正，和老师的提醒改了过来，但是还有机会亲手看到自己输入程序的实验板呼吸灯发亮成功，有一点小失望，但是问题不大，继续努力学习