From 1aa420c1ca3715dbd3e0c34c356890704d020ba3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9F=D0=B0=D0=B2=D0=B5=D0=BB=20=D0=92=D0=B5=D1=80=D1=88?=
 =?UTF-8?q?=D0=B8=D0=BD=D0=B8=D0=BD?= <stud128097@vyatsu.ru>
Date: Sun, 16 Apr 2023 18:24:52 +0000
Subject: [PATCH] Slave

---
 SPI/slave.ino | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 SPI/slave.ino

diff --git a/SPI/slave.ino b/SPI/slave.ino
new file mode 100644
index 0000000..27ece8c
--- /dev/null
+++ b/SPI/slave.ino
@@ -0,0 +1,100 @@
+#include <avr/io.h>
+#include <util/delay.h>
+
+#define DDR_SPI DDRB
+#define DD_MOSI PB3
+#define DD_MISO PB4
+#define DD_SCK PB5
+#define DD_SS PB2
+
+
+static int index = 0;
+static byte data[255];
+
+
+void SPI_SlaveInit(void)
+{
+    DDR_SPI = (1 << DD_MISO);
+
+    SPCR = (1 << SPE) | (1 << SPIE);
+}
+
+ISR(SPI_STC_vect)
+{
+    char received = SPDR;
+    data[index] = received;
+    index++;
+}
+
+void setup()
+{
+    Serial.begin(9600);
+    SPI_SlaveInit();
+    Serial.println("Initialization ");
+}
+
+void SetCommand(byte *data2){
+    byte command = data2[0];
+    // Отрезать 1 элемент от оставшихся
+    byte result[index];
+    byte *ptr = &data2[1];
+    strcpy(result, ptr);
+    Serial.print("\nReceived command: ");
+    Serial.println(command);
+    switch (command){
+
+        case 6:
+            AddSymbol(result);
+            break;
+
+    }
+}
+
+
+void AddSymbol(byte *symbols){
+    Serial.print("Received Add: ");
+
+    for(int i = 0; i < index-1; i++) {
+        Serial.print(symbols[i]);
+        Serial.print(" ");
+    }
+}
+
+
+// Функция для вычисления контрольной суммы XOR
+byte calculateXORChecksum(byte *data, int length) {
+    byte checksum = 0;
+    for (int i = 0; i < length - 1; i++) {
+        checksum ^= data[i];
+    }
+    return checksum;
+}
+
+void loop() {
+  if(PINB & (1 << 2))
+  {
+    if(index > 0)
+    {
+      // byte calculatedChecksum = calculateXORChecksum(data, index);
+      // byte last = data[index - 1];
+      // Serial.println();
+      // Serial.println("--------------");
+      // Serial.print("\n Last: ");
+      // Serial.print(last);
+      // Serial.print("\t Sum: ");
+      // Serial.println(calculatedChecksum);
+      
+      // // SPDR = calculatedChecksum;
+      // if (last != calculatedChecksum)
+      // {
+      //   Serial.println("\n -----Invalid Checksum!---");
+        
+      //   index = 0;
+      //   return;
+      // }
+      
+      SetCommand(data);
+      index=0;
+    }
+  }
+}