PIC and 485 communication source program

PIC and 485 Communication Source Code

#include "HardwareProfile.h"

// Configuration bits

__CONFIG(HS & WDTDIS & PWRTDIS & BORDIS & LVPDIS);

void Board_Init(void);

#if defined(PIC_USE_HC595)

bit b_Reflash;

#endif

#if defined(PIC_USE_KB)

#define Free 1

#define Press 0

bit b_KeyActive;

bit b_KeyPress;

bit b_KeyState;

BYTE u_KeyValue;

BYTE u_SCANACC;

BYTE i_KeyValueBuffer[2];

#endif

BYTE u_10ms_Acc = 0;

BYTE u_50ms_Acc = 0;

BYTE u_100ms_Acc = 0;

BYTE u_200ms_Acc = 0;

WORD i_500ms_Acc = 0;

WORD i_1s_Acc = 0;

BYTE u_frame = 0;

WORD i_ADC;

void interrupt ISR(void)

{

if (T0IF)

{

T0IF = 0;

TMR0 = 0x0a; // 1ms timer

u_10ms_Acc++;

u_50ms_Acc++;

u_100ms_Acc++;

u_200ms_Acc++;

i_500ms_Acc++;

i_1s_Acc++;

#if defined(PIC_USE_HC595)

b_Reflash = 1;

#endif

if (u_10ms_Acc >= 10)

{

u_10ms_Acc = 0;

// Add tasks to execute every 10ms

}

if (u_50ms_Acc >= 50)

{

u_50ms_Acc = 0;

// Add tasks to execute every 50ms

#if defined(PIC_USE_KB)

ADIF = 0;

ADGO = 1;

#endif

}

if (u_100ms_Acc >= 100)

{

u_100ms_Acc = 0;

// Add tasks to execute every 100ms

}

if (u_200ms_Acc >= 200)

{

u_200ms_Acc = 0;

// Add tasks to execute every 200ms

}

if (i_500ms_Acc >= 500)

{

i_500ms_Acc = 0;

// Add tasks to execute every 500ms

}

}

if (ADIF)

{

ADIF = 0;

#if defined(PIC_USE_KB)

if (ADRESH != 0)

{

b_KeyPress = 1; // Button pressed

i_ADC = ADRESH;

i_ADC = i_ADC << 8;

i_ADC = i_ADC | ADRESL;

i_ADC = i_ADC & 0xfff8l;

i_ADC = i_ADC >> 2;

}

else

{

b_KeyState = Free; // No button pressed

b_KeyPress = 0;

LED_IO = 0x00;

}

#endif

if (TXIF && TXEN)

{

TXIF = 0;

}

}

}

void main()

{

Board_Init();

while (1)

{

#if defined(PIC_USE_HC595)

if (b_Reflash)

{

LED_Reflash();

b_Reflash = 0;

}

#endif

if (BUTTON1_IO == 0)

{

DisplayNumber_Process(8888);

}

if (BUTTON2_IO == 0)

{

DisplayNumber_Process(0);

}

#if defined(PIC_USE_RS485)

if (RCIF)

{

LED0_IO = LED0_IO ^ 1;

DisplayNumber_Process(RS485_RW());

}

#endif

}

}

////////////////////////////////////////////////////////////

// Function: void Board_Init(void)

// Input: None

// Output: None

// Overview: Initialize all devices on the board based on application needs.

void Board_Init(void)

{

BUTTON1_TRIS = 1;

BUTTON2_TRIS = 1;

LED_TRIS = 0;

LED_IO = 0x01;

TMR0_Init();

#if defined(PIC_USE_HC595)

HC595_Init();

#endif

#if defined(PIC_USE_LCD12864)

LCD_Init();

#endif

#if defined(PIC_USE_ISD1700)

ISD1700_Init();

#endif

#if defined(PIC_USE_KB)

KeyBoard_Init();

#endif

#if defined(PIC_USE_RS485)

RS485_Init();

#endif

}

#include

#include "HardwareProfile.h"

#if defined(PIC_USE_RS485)

void RS485_Init(void)

{

RS485_DIR_IO = Receive;

RS485_DIR_TRIS = 0;

RS485_RX_TRIS = 1;

RS485_TX_TRIS = 0;

//SPBRG = DIVIDER;

//RCSTA = (NINE_BITS|0x90);

//TXSTA = (SPEED|NINE_BITS|0x20);

SPBRG = 64; // Baud rate is 9600

BRGH = 1; // High speed baud rate enable

TXEN = 1; // Enable transmission

CREN = 1; // Enable continuous reception

SPEN = 1; // Enable serial port

TXIE = 0;

RCIE = 0; // Disable receive interrupt

TXIF = 0;

RCIF = 0;

PEIE = 1;

GIE = 1;

}

void RS485_Putch(BYTE byte)

{

// Send one byte

while (!TXIF); // Wait until transmit buffer is empty

RS485_DIR_IO = Send;

TXREG = byte;

while (!TRMT); // Wait until transmission is complete

RS485_DIR_IO = Receive;

}

BYTE RS485_Getch(void)

{

// Retrieve one byte

while (!RCIF); // Wait until receive buffer is not empty

RCIF = 0;

return RCREG;

}

BYTE RS485_RW(void)

{

BYTE temp;

RS485_Putch(temp = RS485_Getch());

return temp;

}

#endif