commit a basic example for lab 5

Author: MykolaKovalyk

mc_labs/mc_lab_05/lab5-turchynyak/lab5.pdsprj

@@ -0,0 +1,56 @@
+bool isAddress = true;
+bool isCommand = false;
+byte command;
+
+void setWriteModeRS485() {
+  byte port = PORTD;
+  PORTD |= 1 << PD1; 
+  delay(1);
+}
+
+ISR(USART1_TX_vect)
+{ 
+  PORTD &= ~(1 << PD1);
+}
+
+void setup() {
+  delay(200);
+  pinMode(LED_BUILTIN, OUTPUT);
+  digitalWrite(LED_BUILTIN, HIGH);   
+
+  DDRD |= 1 << PD1;
+  PORTD &= ~(1 << PD1);
+
+  Serial.begin(9600);
+  Serial1.begin(9600, SERIAL_8N1);
+  UCSR1B |= (1 << UCSZ12) | (1 << TXCIE1);
+}
+
+void loop() {
+  if (Serial.available()) { 
+    byte inByte = Serial.read();
+    if (isAddress) {
+      setWriteModeRS485();
+      UCSR1B |= 1 << TXB81;
+      Serial1.write(inByte);
+      isAddress = false;
+      isCommand = true;
+    } else if (isCommand) {
+      command = inByte;
+      isCommand = false;
+      setWriteModeRS485();
+      UCSR1B &= ~(1 << TXB81); 
+      Serial1.write(inByte);
+      if (command == 0xB1) isAddress = true;
+    } else {
+      isAddress = true;
+      setWriteModeRS485();
+      UCSR1B &= ~(1 << TXB81);
+      Serial1.write(inByte);
+    }
+  }
+  if (Serial1.available()) {
+    byte inByte1 = Serial1.read();
+    Serial.write(inByte1);
+  }
+}

mc_labs/mc_lab_05/lab5-turchynyak/sketch_master/sketch_master.ino

@@ -0,0 +1,90 @@
+#define B 1
+#define U 2
+#define C 3
+#define H 4
+#define A 5
+#define K 6
+#define R 7
+#define O 8
+#define M 9
+#define N 10
+#define T 11
+#define S 12
+#define V 13
+#define Y 14
+#define _ 15
+
+const byte SLAVE_ADDRESS = 55;
+const byte DATA_ARRAY_LENGTH = 24;
+
+byte data_array[DATA_ARRAY_LENGTH] = {
+  B, U, C, H, A, K, _,
+  R, O, M, A, N, _, 
+  T, A, R, A, S, O, V, Y, C, H,
+  _
+};
+
+void setWriteModeRS485() {
+  PORTD |= 1 << PD2;
+  delay(1);
+}
+
+ISR(USART_TX_vect) { 
+  PORTD &= ~(1 << PD2);
+}
+
+int writeDataToMaster() {
+  unsigned short checkSumCRC = get_crc8(data_array, DATA_ARRAY_LENGTH - 1);
+  data_array[DATA_ARRAY_LENGTH - 1] = checkSumCRC;
+
+  for(int k = 0; k < 5; k++){
+    for (int i = 0; i < DATA_ARRAY_LENGTH; i++) {
+        byte byteToSend = data_array[i];
+        if (k == 1 && i == DATA_ARRAY_LENGTH - 2) {
+          byteToSend ^= (1 << 0);
+        } else if (k == 4 && i == 3) {
+          byteToSend ^= (1 << 0) | (1 << 2) | (1 << 5);
+        }
+        Serial.write(byteToSend);
+    }
+  }
+}
+
+void setup() {
+  delay(200);
+  DDRD = 0b00000111;
+  PORTD = 0b11111000;
+  Serial.begin(9600, SERIAL_8N1);
+  UCSR0B |= (1 << UCSZ02) | (1 << TXCIE0);
+  UCSR0A |= (1 << MPCM0);
+  delay(1);
+}
+
+void loop() {
+  if (Serial.available()) {
+    byte inByte = Serial.read();
+    if (SLAVE_ADDRESS == inByte) {
+      UCSR0A &= ~(1 << MPCM0);
+      setWriteModeRS485();
+      writeDataToMaster();
+      delay(100);
+    } 
+  }
+}
+
+uint8_t get_crc8(const uint8_t *data, size_t array_length) {
+    const uint8_t poly = 0x7;
+    uint8_t crc = 0x00;
+
+    for (size_t i = 0; i < array_length; i++) {
+        crc ^= data[i];
+        for (int j = 0; j < 8; j++) {
+            if (crc & 0x80) {
+                crc = (crc << 1) ^ poly;
+            } else {
+                crc <<= 1;
+            }
+        }
+    }
+    return crc ^ 0x00;
+}

mc_labs/mc_lab_05/lab5-turchynyak/sketch_slave1/sketch_slave1.ino

@@ -0,0 +1,77 @@
+#define ZERO 16
+#define ONE 17
+#define TWO 18
+#define THREE 19
+#define SIX 20
+#define DOT  21
+#define _ 15
+
+const byte SLAVE_ADDRESS = 65;
+const byte DATA_ARRAY_LENGTH = 11;
+byte data_array[DATA_ARRAY_LENGTH] = { TWO, SIX, DOT, ONE, ONE, DOT, TWO, ZERO, ZERO, THREE, _ };
+
+void setWriteModeRS485() {
+  PORTD |= 1 << PD2;
+  delay(1);
+}
+
+ISR(USART_TX_vect)
+{
+  PORTD &= ~(1 << PD2); 
+}
+
+void writeDataToMaster() {
+  unsigned short checkSumCRC = get_crc8(data_array, DATA_ARRAY_LENGTH - 1);
+  data_array[DATA_ARRAY_LENGTH - 1] = checkSumCRC;
+
+  for(int k = 0; k < 5; k++) {
+    for (int i = 0; i < DATA_ARRAY_LENGTH; i++) {
+      byte byteToSend = data_array[i];
+      if (k == 2 && i == 0) {
+        byteToSend ^= (1 << 3);
+      } else if (k == 3 && i == 1) {
+        byteToSend ^= ((1 << 3) | (1 << 7)) ;
+      }
+      Serial.write(byteToSend);
+    }
+  }
+}
+
+void setup() {
+  delay(200);
+  DDRD = 0b00000111;
+  PORTD = 0b11111000;
+  Serial.begin(9600, SERIAL_8N1);
+  UCSR0B |= (1 << UCSZ02) | (1 << TXCIE0);
+  UCSR0A |= (1 << MPCM0);
+  delay(1);
+}
+
+void loop() {
+  if (Serial.available()) {
+    byte inByte = Serial.read();
+    if (SLAVE_ADDRESS == inByte) {
+      UCSR0A &= ~(1 << MPCM0);
+      setWriteModeRS485();
+      writeDataToMaster();
+      delay(100);
+    } 
+  }
+}
+
+uint8_t get_crc8(const uint8_t *data, size_t array_length) {
+    const uint8_t poly = 0x7;
+    uint8_t crc = 0x00;
+
+    for (size_t i = 0; i < array_length; i++) {
+        crc ^= data[i];
+        for (int j = 0; j < 8; j++) {
+            if (crc & 0x80) {
+                crc = (crc << 1) ^ poly;
+            } else {
+                crc <<= 1;
+            }
+        }
+    }
+    return crc ^ 0x00;
+}