Touch-controlled dimming desk lamp experiment based on 51 single-chip microcomputer-EEWORLD

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****************************** Copyright(C) CaKe ************************************

===================================

===============**Copyright information: CaKen Studio ==============

===============**File name: main.c ==============

==============**Author : CaKen ==============

===============**Version number: V1.0

===============**Time : 2014.08.28 ===============

===============**Function description: Touch dimming desk lamp experimental test ==============================**Sina Weibo: CaKen ==============

***************************************************

#include"STC12C5A60S2.H" //STC12Cx052 or STC12Cx052AD series MCU header file

sbit ON_OFF_Key = P2 ^ 0; //ON/OFF switch key

sbit Add_Key = P2 ^ 3; //Add brightness (+)

sbit Doc_Key = P2 ^ 7; //Reduce brightness (-)

//LED connected to P1.3 (PWM0)

unsigned char Bright = 0x88; //global variable, brightness value

bit POWER = 0; //LED light on/off status flag

******************************************************

Function name: PWM initialization function

Call: PWM_Init();

Parameters: None

Return value: None

Result: Initialize PCA to PWM mode with an initial duty cycle of 0

Note: If you need more PWM outputs, just plug them into CCAPnH and CCAPnL.

******************************************************/

void PWM_Init (void)

{

CMOD = 0x02; //Set PCA timer

CL = 0x00;

CH = 0x00;

CCAPM0 = 0x42; //PWM0 sets PCA working mode to PWM mode (0100 0010)

CCAP0L = 0x00; //Set the initial value of PWM0 to be the same as CCAP0H

CCAP0H = 0x00; //PWM0 is initially 0

CR = 1; //Start PCA timer

}

*************************************************************

Function name: PWM0 duty cycle setting function

Call: PWM0_Set();

Parameter: 0x00~0xFF (0~255 can also be used)

Return value: None

Result: Set the PWM mode duty cycle, all high level when it is 0, all low level when it is 1

Note: If you need the setting function of PWM1, just change the 0 in CCAP0L and CCAP0H to 1.

**********************************************************/

void PWM0_Set (unsigned char a)

{

CCAP0L= a; //Set value to be written directly into CCAP0L

CCAP0H= a; //Set value to be written directly into CCAP0H

}

*************************************************************

Function name: millisecond CPU delay function

Call: DELAY_MS (?);

Parameter: 1~65535 (parameter cannot be 0)

Return value: None

Result: The CPU mode delay is the same as the parameter value in milliseconds

Note: When applied to 1T MCU, i<600; when applied to 12T MCU, i<125

************************************************************/

void DELAY_MS (unsigned int a)

{

unsigned int i;

while( --a != 0)

{

for(i = 0; i < 600; i++);

}

********************************************************

Function name: UART serial port initialization function

Call: UART_Init();

Parameters: None

Return value: None

Result: Start UART serial port receiving interrupt, allow serial port receiving, start T/C1 to generate baud rate (occupied)

Note: The oscillator crystal is 12MHz, and the PC serial port is set to [

void UART_Init (void)

{

EA = 1; //Enable general interrupts (if interrupts are not used, they can be //masked)

ES = 1; //Enable UART serial port interrupt

TMOD = 0x20; //Timer T/C1 working mode 2

SCON = 0x50; //Serial port working mode 1, serial port reception is allowed (serial port reception is prohibited when SCON = 0x40)

TH1 = 0xFD; //The initial value of the timer is set to 9600 for the high 8 bits

TL1 = 0xFD; //Set the low 8 bits of the timer initial value

PCON = 0x80; //Baud rate multiplier

TR1 = 1; //Timer starts

}

*******************************************************

Function name: UART serial port sending function

Call: UART_Send (?);

Parameter: Data to be sent by the UART serial port (8 bits/1 byte)

Return value: None

Result: Send the data in the parameter to the UART serial port, and exit after confirming that the sending is completed.

Remark:

***********************************************************/

void UART_Send (unsigned char UART_data)

{ //Define the serial port sending data variable

SBUF = UART_data; //Send the received data back

while(TI == 0); //Check the send interrupt flag

TI = 0; //Set the transmit interrupt flag to 0 (cleared by software)

}

***********************************************************

Function name: main function

Call: No

Parameters: None

Return value: None

Result: Infinite loop at the beginning of the program

Note: Dimming desk lamp, touch delay lamp

*************************************************************/

void main (void)

{

PWM_Init(); //PWM initialization

UART_Init(); //Serial port initialization

P2M0 = 0x00; //Set the P2 interface to high impedance input

P2M1 = 0xFF; //Touch button enabled

PWM0_Set(0);

UART_Send (Bright); //Send the brightness value to the PC

DELAY_MS(200); //Delay to wait for the I/O interface level to stabilize

while(1)

{

unsigned char a;

UART_Send (Bright); //Send the brightness value to the PC

if(ON_OFF_Key == 1) //The on/off key is pressed

{

if(POWER == 0) //If the current state is off, execute the light-on program

{

for(a=0;a<=Bright;a++)

{

PWM0_Set(a);

DELAY_MS (20); //Time interval for fading to dark

}

PWM0_Set(Bright); //Achieve the stored LED brightness

POWER = 1; //Turn the status flag to on

// DELAY_MS (10000); //After 10 seconds, the light will automatically turn off

// PWM0_Set(0);

}

else //If the current state is on, execute the light off procedure

{

for(a=Bright;a>0;a--) // loop gradually darkens

{

PWM0_Set(a);

DELAY_MS (20); //Time interval for fading to dark

}

PWM0_Set(0); //Turn off LED

POWER = 0; //Turn the status flag to off

}

while(ON_OFF_Key == 0); //Wait for the button to be released

}

if(Add_Key == 1 && POWER == 1) //The brightness key is pressed and the light is on

{

Bright++; //Brightness value plus 1

PWM0_Set(Bright); //Write the value into PWM to control the LED brightness

if(Bright >= 0xFD) //If the brightness value is greater than 0xFD, it will not increase.

{

Bright = 0xFD;

}

DELAY_MS (20); //Time interval for gradual brightness change

}

if(Doc_Key == 1 && POWER == 1) //The brightness reduction key is pressed while the light is on

{

Bright--; //Brightness value minus 1

PWM0_Set(Bright); //Write the value into PWM to control the LED brightness

if(Bright < 0x08) //If the brightness value is less than 0x08, it will not be reduced

{

Bright = 0x08;

}

DELAY_MS (100); //Time interval for gradual brightness change

}

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