PIC30F4013+PIC16C72兩顆單片機製作簡易PLC
你可以根據需要進行修改：PIC30F4013端：
// Define communication pins
#define STATUS_PIN RB5
#define DATA_IN_PIN RB3
#define DATA_OUT_PIN RB4
#define CLOCK_PIN RB2
// Define data buffer size
#define BUFFER_SIZE 16
// Define instruction codes
#define READ_INPUTS 0x01
#define WRITE_OUTPUT 0x02
// Define I/O port addresses
#define INPUT_PORT PORTB
#define OUTPUT_PORT LATB
void main() {
// Set communication pins as output
TRISBbits.TRISB2 = 0; // Clock pin
TRISBbits.TRISB4 = 0; // Data out pin
// Set communication pins as input
TRISBbits.TRISB5 = 1; // Status pin
TRISBbits.TRISB3 = 1; // Data in pin
// Initialize input/output ports
TRISD = 0xFFFF; // Set all pins as input
TRISC = 0x0000; // Set all pins as output
// Initialize data buffer
unsigned char buffer;
for (int i = 0; i < BUFFER_SIZE; i++) {
buffer = 0;
}
while (1) {
// Wait for read inputs instruction
while (1) {
if (receive_instruction() == READ_INPUTS) {
break;
}
}
// Read inputs and store in buffer
for (int i = 0; i < BUFFER_SIZE; i++) {
buffer = INPUT_PORT;
}
// Send data back to master
send_data(buffer, BUFFER_SIZE);
// Wait for write output instruction
while (1) {
if (receive_instruction() == WRITE_OUTPUT) {
break;
}
}
// Read data from master and write to outputs
for (int i = 0; i < BUFFER_SIZE; i++) {
OUTPUT_PORT = buffer;
}
}
}
// Function to receive instruction from master
unsigned char receive_instruction() {
unsigned char instruction = 0;
// Wait for status pin to go low
while (STATUS_PIN);
// Receive instruction byte
for (int i = 0; i < 8; i++) {
// Wait for clock pulse
while (!CLOCK_PIN);
// Read data in pin
instruction |= (DATA_IN_PIN << i);
// Wait for clock pulse
while (CLOCK_PIN);
}
// Set data out pin low
DATA_OUT_PIN = 0;
return instruction;
}
// Function to send data to master
void send_data(unsigned char* data, int size) {
// Set data out pin high
DATA_OUT_PIN = 1;
// Send data bytes
for (int j = 0; j < size; j++) {
unsigned char byte = data;
// Send data byte
for (int i = 0; i < 8; i++) {
// Set clock pin high
CLOCK_PIN = 1;
// Send bit
DATA_OUT_PIN = ((byte >> i) & 0x01);
// Wait for clock pulse
__delay_us(1);
// Set clock pin low
CLOCK_PIN = 0;
// Wait for clock pulse
__delay_us(1);
}
}
// Set data out pin low
DATA_OUT_PIN = 0;
}
PIC16C72端：
// Define communication pins
#define STATUS_PIN RC0
#define DATA_IN_PIN RC2
#define DATA_OUT_PIN RC1
#define CLOCK_PIN RC3
// Define data buffer size
#define BUFFER_SIZE 16
// Define instruction codes
#define READ_INPUTS 0x01
#define WRITE_OUTPUT 0x02
// Define I/O port addresses
#define INPUT_PORT PORTB
#define OUTPUT_PORT LATB
void main() {
// Set communication pins as output
TRISCbits.TRISC1 = 0; // Data out pin
TRISCbits.TRISC3 = 0; // Clock pin
// Set communication pins as input
TRISCbits.TRISC0 = 1; // Status pin
TRISCbits.TRISC2 = 1; // Data in pin
// Initialize input/output ports
TRISB = 0xFFFF; // Set all pins as input
TRISA = 0x0000; // Set all pins as output
// Initialize data buffer
unsigned char buffer;
for (int i = 0; i < BUFFER_SIZE; i++) {
buffer = 0;
}
while (1) {
// Send read inputs instruction to slave
send_instruction(READ_INPUTS);
// Receive data from slave
receive_data(buffer, BUFFER_SIZE);
// Write inputs to output ports
for (int i = 0; i < BUFFER_SIZE; i++) {
OUTPUT_PORT = buffer;
}
// Send write output instruction to slave
send_instruction(WRITE_OUTPUT);
// Read data from master and store in buffer
for (int i = 0; i < BUFFER_SIZE; i++) {
buffer = INPUT_PORT;
}
// Send data back to master
send_data(buffer, BUFFER_SIZE);
}
}
// Function to send instruction to slave
void send_instruction(unsigned char instruction) {
// Set data out pin low
DATA_OUT_PIN = 0;
// Send instruction byte
for (int i = 0; i < 8; i++) {
// Wait for clock pulse
while (CLOCK_PIN);
// Send bit
DATA_OUT_PIN = ((instruction >> i) & 0x01);
// Wait for clock pulse
while (!CLOCK_PIN);
}
// Wait for status pin to go high
while (!STATUS_PIN);
}
// Function to receive data from slave
void receive_data(unsigned char* data, int size) {
// Set data out pin high
DATA_OUT_PIN = 1;
// Receive data bytes
for (int j = 0; j < size; j++) {
unsigned char byte = 0;
// Receive data byte
for (int i = 0; i < 8; i++) {
// Wait for clock pulse
while (!CLOCK_PIN);
// Read data in pin
byte |= (DATA_IN_PIN << i);
// Wait for clock pulse
while (CLOCK_PIN);
}
// Store data byte in buffer
data = byte;
}
// Set data out pin low
DATA_OUT_PIN = 0;// Function to send data to master
}
void send_data(unsigned char* data, int size) {
// Set data out pin high
DATA_OUT_PIN = 1;
// Send data bytes
for (int j = 0; j < size; j++) {
unsigned char byte = data;
// Send data byte
for (int i = 0; i < 8; i++) {
// Wait for clock pulse
while (CLOCK_PIN);
// Send bit
DATA_OUT_PIN = ((byte >> i) & 0x01);
// Wait for clock pulse
while (!CLOCK_PIN);
}
}
// Set data out pin low
DATA_OUT_PIN = 0;
}
在設計PLC時，需要仔細考慮各種因素，例如通信協議、故障處理、安全性等。
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