Add Watchdog, use consistent types, enable interrupts.

include/cc2500.h

 #ifndef _IFACE_CC2500_H_
 #define _IFACE_CC2500_H_
 
+#include <stdint.h>
+
 enum {
     CC2500_00_IOCFG2           = 0x00,        // GDO2 output pin configuration
     CC2500_01_IOCFG1           = 0x01,        // GDO1 output pin configuration
 void cc2500ReadRegisterMulti(uint8_t address, uint8_t data[], uint8_t length);
 void cc2500WriteRegisterMulti(uint8_t address, const uint8_t data[], uint8_t length);
 
-unsigned char cc2500ReadReg(unsigned char address);
+uint8_t cc2500ReadReg(uint8_t address);
 void cc2500WriteReg(uint8_t address, uint8_t data);
 
 void cc2500Strobe(uint8_t address);

src/cc2500.c

  */
 
 #include <util/delay.h>
+
 #include "spi.h"
 #include "cc2500.h"
 
     CS_on;
 }
 
-unsigned char cc2500ReadReg(unsigned char address) {
+uint8_t cc2500ReadReg(uint8_t address) {
     uint8_t result;
     CS_off;
     address |= 0x80; // bit 7 =1 for reading

src/main.c

  * main() method
  */
 
+#include <avr/interrupt.h>
+#include <avr/wdt.h>
+
 #include "spi.h"
 #include "timer.h"
 #include "rx.h"
 
+void watchdogBoot(void) __attribute__((naked)) __attribute__((section(".init3")));
+void watchdogBoot(void) {
+    MCUSR = 0;
+    wdt_disable();
+}
+
 void main(void) {
     timerInit();
+    sei(); // Enable interrupts (required for timer)
     spiInit();
+    wdt_enable(WDTO_120MS); // Trigger Watchdog after 120ms
+
     rxInit();
 
     for(;;) { }