Make: AVR Programming by Elliot Williams

Author:Elliot Williams
Language: eng
Format: epub, mobi, pdf
ISBN: 9781449355784
Publisher: Maker Media, Inc.
Published: 2014-03-25T16:00:00+00:00

The header

The header file’s contents are shown in Example 11-3.

Example 11-3. servoSundial.h listing

/* Quasi-realtime-clock with servo sundial. */ // ------- Includes -------- // #include <avr/io.h> // ------- Defines -------- // #define PULSE_MIN 1000 /* experiment with these values */ #define PULSE_MAX 2000 /* to match your own servo */ #define PULSE_RANGE (PULSE_MAX - PULSE_MIN) #define PULSE_OVER 3000 /* Must be larger than PULSE_MAX */ #define START_TIME 10 /* 10 am */ #define STOP_TIME 22 /* 10 pm */ #define HOURS_RANGE (STOP_TIME - START_TIME - 1) #define LASER PB2 #define LASER_PORT PORTB #define LASER_DDR DDRB #define SERVO PB1 #define SERVO_PORT PORTB #define SERVO_DDR DDRB #define OVERFLOWS_PER_SECOND 31250 /* nominal, should calibrate */ // -------- Global Variables --------- // volatile uint16_t ticks; volatile uint8_t hours = 15; /* arbitrary default time */ volatile uint8_t minutes = 42; volatile uint8_t seconds = 57; // Serial input and output functions void pollSerial(void); void printTime(uint8_t hours, uint8_t minutes, uint8_t seconds); // Servo setup and utility functions void initTimer1_Servo(void); void enableServo(void); void disableServo(void); void setServoPosition(void); // Realtime-clock handling functions // Use the globals ticks, hours, minutes, seconds void initTimer0_Clock(void); void everyHour(void); void everyMinute(void); void everySecond(void);

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