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main.c

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+/*
+ * 433 MHz key fob jammer based on ATTINY13A and FS1000A RF transmitting module
+ * PIN B2 of ATTINY13A is connected to DATA IN of FS1000A transmitter board
+ * both ATTINY13 and FS1000A are connected to 5V power supply
+ * internal clock 9.6MHz with division by 8 = 1.2MHz effective clock
+ * 
+ */
+
+#include <stdint.h>
+#include <avr/io.h>
+#include <util/delay.h>
+
+#define	FS1000A_DATA_HIGH()		(PORTB |= _BV(FS1000A_DATA_PIN))
+#define	FS1000A_DATA_LOW()		(PORTB &= ~_BV(FS1000A_DATA_PIN))
+#define	FS1000A_DATA_OUTPUT()		(DDRB |= _BV(FS1000A_DATA_PIN))
+
+// Main Settings
+#define	FS1000A_DATA_PIN			PB2
+
+int main(void)
+{
+        uint8_t widthsize;
+        uint8_t sequence;
+        uint8_t duration;
+
+        // SET OUTPUT PIN TO STEER FS1000A DATA IN
+        FS1000A_DATA_OUTPUT();
+        FS1000A_DATA_LOW();
+
+	/* neverending loop */
+    while (1) {
+
+        widthsize = 0;
+        sequence = 0;
+        duration = 0;
+
+        // generating SQUARE WAVE for FS1000A DATA INPUT
+        // we send 20 sequences of 50 pulses different width ( from 50us to 1 ms )
+        // to generate enough distortion on 433 MHz frequency
+        
+        for(sequence=1; sequence<24; sequence++)
+        {
+         
+        // only 10 pulses for each width
+        for(duration=1; duration<=10; duration++)
+          {  
+
+            FS1000A_DATA_HIGH();  // bring DATA PIN up
+
+            // starting from 300usec Pulses
+           for(widthsize=6; widthsize<=(6+sequence); widthsize++)
+             {
+                // Generated by delay loop calculator
+                // at http://www.bretmulvey.com/avrdelay.html
+                //
+                // Delay 60 cycles
+                // 50us at 1.2 MHz
+                 asm volatile (
+                               "    ldi  r18, 20"	"\n"
+                               "1:  dec  r18"	"\n"
+                               "    brne 1b"	"\n"
+                               );
+
+              };  // end of widthsize for loop
+
+            FS1000A_DATA_LOW();  // drag DATA PIN down
+
+            // starting from 300usec Pulses
+           for(widthsize=6; widthsize<=(6+sequence); widthsize++)
+             {
+                // Generated by delay loop calculator
+                // at http://www.bretmulvey.com/avrdelay.html
+                //
+                // Delay 60 cycles
+                // 50us at 1.2 MHz
+                 asm volatile (
+                               "    ldi  r18, 20"	"\n"
+                               "1:  dec  r18"	"\n"
+                               "    brne 1b"	"\n"
+                               );
+
+
+              };  // end of WIDTHSIZE variable for loop
+
+           }; // end of DURATION loop
+
+         }; // end of SEQUENCE variable loop
+
+      }; // neverending loop 
+
+};  // end of MAIN
+
+
+