在CT107D单片机综合实训平台上,产生PWM脉宽调制信号控制8个LED灯进行呼吸流水变化,具体功能要求如下:
[1] 上电开机运行时,关闭蜂鸣器和继电器,L4和L5点亮,其余LED灯熄灭。
[2] 点按独立按键S4松开后,开始控制CT107D板上的L1-L8八个LED小灯进行每隔1秒的呼吸流水点亮,即:L1缓慢亮->L1缓慢灭->L2缓慢亮->L2缓慢灭....L8缓慢亮->L8缓慢灭->L1缓慢亮->L1缓慢灭....循环往复。
[3] 再次点按独立按键S4松开后,控制CT107D板上的LED灯从当前灯开始逆向呼吸流水。即:比如当前的流水是L2缓慢灭->L3缓慢亮,按下S4按键松开后,L3缓慢灭->L2缓慢亮->L2缓慢灭->L1缓慢亮->L1缓慢灭->L8缓慢亮->L8缓慢灭....循环往复。
[4] 每个LED灯,缓慢点亮0.5秒,缓慢熄灭0.5秒。
[5] 按下独立按键S4时,当前LED灯暂停流水变化并保持现有亮度,直至按键松开后,亮度才开始变化。待当前的亮度变化完成后,才开始调整呼吸流水的方向。
[6] 按下独立按键S7时,在数码管上显示当前LED灯的位置和PWM信号占空比,松开后,数码管熄灭。在最左边的1位数码管显示LED灯的位置,在最右边的2位数码管显示PWM信号的占空比。例如:当前点亮L6灯光,PWM信号的占空比为30%,在数码管最左边的1位显示“6”,在最右边的2位数码管显示“30”,其余的数码管熄灭。
[7] 按下独立按键S7时,当前LED灯暂停流水变化并保持现有亮度,直至按键松开后,亮度才开始变化。
#include "regx52.h"
#include "absacc.h"
sbit S7 = P3^0;
sbit S4 = P3^3;
unsigned char pwm = 0;
unsigned char pwm_duty = 0;
unsigned char times = 0;
unsigned char led_go = 0;
unsigned char stat_go = 0;
unsigned char stat = 0;
unsigned char key_puse = 0;
unsigned char code SMG_duanma[18]=
{0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
0x88,0x80,0xc6,0xc0,0x86,0x8e,0xbf,0x7f};
void DelaySMG(unsigned int t)
{
while(t--);
}
void DisplaySMG_Bit(unsigned char pos, unsigned char value)
{
XBYTE[0xE000] = 0xff;
XBYTE[0xC000] = 0x01 << pos;
XBYTE[0xE000] = value;
}
void Display_Info(unsigned char pos, unsigned char duty)
{
DisplaySMG_Bit(0, SMG_duanma[pos]);
DelaySMG(500);
DelaySMG(500);
DisplaySMG_Bit(6, SMG_duanma[duty / 10]);
DelaySMG(500);
DisplaySMG_Bit(7, SMG_duanma[duty % 10]);
DelaySMG(500);
DisplaySMG_Bit(0, 0xff);
DisplaySMG_Bit(6, 0xff);
DisplaySMG_Bit(7, 0xff);
}
void Init_Timer0()
{
TMOD = 0x01;
TH0 = (65535 - 1000) / 256;
TL0 = (65535 - 1000) % 256;
ET0 = 1;
EA = 1;
TR0 = 1;
}
void Service_Timer0() interrupt 1
{
TH0 = (65535 - 1000) / 256;
TL0 = (65535 - 1000) % 256;
if(stat_go == 0)
{
XBYTE[0x8000] = 0xe7;
return;
}
pwm++;
if(pwm <= pwm_duty)
{
XBYTE[0x8000] = ~(0x01 << stat);
}
else if(pwm <= 10)
{
XBYTE[0x8000] = 0xff;
}
else
{
XBYTE[0x8000] = ~(0x01 << stat);
pwm = 0;
if(key_puse == 0)
{
times++;
}
}
}
void LED_Control()
{
if(times == 5)
{
times = 0;
if(led_go == 0)
{
pwm_duty = pwm_duty + 1;
if(pwm_duty == 11)
{
pwm_duty = 10;
led_go = 1;
}
}
else if(led_go == 1)
{
pwm_duty = pwm_duty - 1;
if(pwm_duty == 255)
{
pwm_duty = 0;
led_go = 0;
if(stat_go == 1)
{
stat++;
if(stat == 8)
{
stat = 0;
}
}
else if(stat_go == 2)
{
stat--;
if(stat == 255)
{
stat = 7;
}
}
}
}
}
}
void Scan_Keys()
{
if(S4 == 0)
{
DelaySMG(100);
if(S4 == 0)
{
while(S4 == 0)
{
key_puse = 1;
}
key_puse = 0;
stat_go++;
if(stat_go == 3)
{
stat_go = 1;
}
}
}
if(S7 == 0)
{
DelaySMG(100);
if(S7 == 0)
{
while(S7 == 0)
{
key_puse = 1;
Display_Info(stat + 1, pwm_duty * 10);
}
key_puse = 0;
}
}
}
void Init_System()
{
XBYTE[0xA000] = 0xff;
XBYTE[0xA000] = 0x00;
XBYTE[0xE000] = 0xff;
XBYTE[0xC000] = 0xff;
Init_Timer0();
}
main()
{
Init_System();
while(1)
{
LED_Control();
Scan_Keys();
}
}