基于EM78x153xx芯片一个电源开关键与一个功能键用pwm与定时器0延时控制led八个功能
时间: 2024-04-30 08:24:57 浏览: 11
EM78x153xx芯片是一款8位微控制器,具有多个GPIO引脚可用于控制LED。下面是一个基本的程序框架,以实现您所要求的功能:
```c
#include <EM78x153xx.h>
//定义LED的IO口
#define LED0_PIN P0_0
#define LED1_PIN P0_1
#define LED2_PIN P0_2
#define LED3_PIN P0_3
#define LED4_PIN P0_4
#define LED5_PIN P0_5
#define LED6_PIN P0_6
#define LED7_PIN P0_7
//定义电源开关和功能键的IO口
#define POWER_KEY_PIN P1_0
#define FUNC_KEY_PIN P1_1
//定义PWM输出的频率和占空比
#define PWM_FREQ 1000
#define PWM_DUTY_CYCLE 50
//定义定时器0的计数器初值,用于延时
#define TIMER0_INIT_VALUE 65536 - (FOSC / 12 / 1000)
//定义LED闪烁的时间间隔和持续时间
#define BLINK_INTERVAL 500
#define BLINK_DURATION 1000
//定义全局变量
unsigned char led_state = 0; //记录LED灯的状态
unsigned char blink_count = 0; //记录LED闪烁的次数
//初始化GPIO和定时器0
void init(void)
{
//设置LED的IO口为输出
LED0_PIN = 0;
LED1_PIN = 0;
LED2_PIN = 0;
LED3_PIN = 0;
LED4_PIN = 0;
LED5_PIN = 0;
LED6_PIN = 0;
LED7_PIN = 0;
//设置电源开关和功能键的IO口为输入
POWER_KEY_PIN = 1;
FUNC_KEY_PIN = 1;
//设置定时器0的模式为16位自动重装载模式,时钟源为FOSC/12
T0M = 0;
T0CKS = 0;
//设置PWM输出的频率和占空比
PWM0M = 2;
PWM0C = 0;
PWM0CL = (unsigned char)(256 - FOSC / 12 / PWM_FREQ);
PWM0CH = (unsigned char)(256 - FOSC / 12 / PWM_FREQ * PWM_DUTY_CYCLE / 100);
//使能定时器0和PWM输出
T0EN = 1;
PWM0EN = 1;
}
//延时一段时间
void delay(unsigned int time)
{
T0 = TIMER0_INIT_VALUE;
while (time--)
{
while (!TF0)
;
TF0 = 0;
}
}
//LED闪烁一次
void blink_once(void)
{
led_state = ~led_state;
LED0_PIN = led_state & 0x01;
LED1_PIN = (led_state >> 1) & 0x01;
LED2_PIN = (led_state >> 2) & 0x01;
LED3_PIN = (led_state >> 3) & 0x01;
LED4_PIN = (led_state >> 4) & 0x01;
LED5_PIN = (led_state >> 5) & 0x01;
LED6_PIN = (led_state >> 6) & 0x01;
LED7_PIN = (led_state >> 7) & 0x01;
delay(BLINK_DURATION);
led_state = ~led_state;
LED0_PIN = led_state & 0x01;
LED1_PIN = (led_state >> 1) & 0x01;
LED2_PIN = (led_state >> 2) & 0x01;
LED3_PIN = (led_state >> 3) & 0x01;
LED4_PIN = (led_state >> 4) & 0x01;
LED5_PIN = (led_state >> 5) & 0x01;
LED6_PIN = (led_state >> 6) & 0x01;
LED7_PIN = (led_state >> 7) & 0x01;
delay(BLINK_INTERVAL);
}
//主函数
void main(void)
{
init();
while (1)
{
//如果电源开关被按下,则切换LED灯的状态
if (!POWER_KEY_PIN)
{
led_state = ~led_state;
LED0_PIN = led_state & 0x01;
LED1_PIN = (led_state >> 1) & 0x01;
LED2_PIN = (led_state >> 2) & 0x01;
LED3_PIN = (led_state >> 3) & 0x01;
LED4_PIN = (led_state >> 4) & 0x01;
LED5_PIN = (led_state >> 5) & 0x01;
LED6_PIN = (led_state >> 6) & 0x01;
LED7_PIN = (led_state >> 7) & 0x01;
delay(BLINK_INTERVAL);
}
//如果功能键被按下,则LED灯闪烁8次
if (!FUNC_KEY_PIN)
{
for (blink_count = 0; blink_count < 8; blink_count++)
{
blink_once();
}
}
}
}
```
在程序中,我们使用了定时器0和PWM输出来实现LED的闪烁和呼吸效果。当电源开关被按下时,LED灯的状态会切换;当功能键被按下时,LED灯会闪烁8次。