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  1. /**
  2.  * MCU driver.
  3.  *
  4.  * @date    2006-11-19
  5.  *
  6.  * @author  Jimmy Myhrman
  7.  *  
  8.  */
  9.  
  10. /*-----------------------------------------------------------------------------
  11.  * Includes
  12.  *---------------------------------------------------------------------------*/
  13. #include <mcu.h>
  14.  
  15.  
  16. /*-----------------------------------------------------------------------------
  17.  * Prerequisites
  18.  *---------------------------------------------------------------------------*/
  19. #ifndef MCU
  20.     #error MCU Not defined in mcu_cfg.h
  21. #endif
  22.  
  23.  
  24. /*-----------------------------------------------------------------------------
  25.  * Public Functions
  26.  *---------------------------------------------------------------------------*/
  27.  
  28. /**
  29.  * Initialize MCU. If the MCU is mega88, the internal clock frequency will be
  30.  * set to 8MHz. Interrupts must not be enabled when calling this function!
  31.  */
  32. void Mcu_Init() {
  33.     #if defined(__AVR_ATmega88__) || defined(__AVR_ATmega168__)
  34.     // set the clock speed to 8MHz
  35.     // set the clock prescaler. First write CLKPCE to enable setting of clock the
  36.     // next four instructions.
  37.     CLKPR=(1<<CLKPCE);
  38.     CLKPR=0; // 8 MHZ
  39.     #endif
  40. }
  41.  
  42. /**
  43.  * Enable interrupts.
  44.  */
  45. void Mcu_EnableIRQ() {
  46.     #if MCU == ATMEGA8
  47.         sei();
  48.     #endif
  49. }
  50.  
  51. /**
  52.  * Disable interrupts.
  53.  */
  54. void Mcu_DisableIRQ() {
  55.     #if MCU == ATMEGA8
  56.         cli();
  57.     #endif
  58. }
  59.