main.h

/**
  ******************************************************************************
  * FuncGen - A function generator based on the AD9833, controlled by an STM8
  *
  * @author  Brad Roy
  * @version V1.1dev Rotary Encoder support
  * @date    04-Dec-2020
  *****************************************************************************/ 
//function declarations
	static void CLK_Config(void);
	static void SPI_Config(void);
	static void GPIO_Config(void);
	static void Setup(void);
	static long enc_read(void);
	/*inline long map(long x, long in_min, long in_max, long out_min, long out_max) 
		{return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min; }*/
	/*inline int abs(int x)
		{return x < 0 ? -x : x; }*/
	int putchar(int c);
	//int getchar(void);

/* Pin Assignments------------------------------------------------------------*/
//awkward - pin d2 == ADC1 channel3, would be nice to do this with one #define instead of two
	#define POTPIN GPIOD, GPIO_PIN_2  //our frequency control potentiometer pin
	#define POTCH ADC1_CHANNEL_3      //make sure this corresponds to the pin chosed on previous

	/* Pin Assignment for AD9833. Assumes CLK and DAT are using hardware SPI pins */
	#define SPISS GPIOC, GPIO_PIN_7   //our slave select pin: defined in AD9833.c

	/* Pins Assignment for LCD module, 4-bit mode */
	#define LCD_DB7 GPIOC,GPIO_PIN_4 // C4
	#define LCD_DB6 GPIOC,GPIO_PIN_3 // C3
	#define LCD_DB5 GPIOB,GPIO_PIN_4 // B4
	#define LCD_DB4 GPIOB,GPIO_PIN_5 // B5
	#define LCD_EN  GPIOA,GPIO_PIN_2 // A2
	#define LCD_RS  GPIOA,GPIO_PIN_1 // A1

	#define ENCODER_BTN GPIOD,GPIO_PIN_6  // mode shift button
	#define ENCODER_1   GPIOD,GPIO_PIN_3
	#define ENCODER_2   GPIOD,GPIO_PIN_4

	#define TICK_PIN GPIOD,GPIO_PIN_5  //output our systick frequency on this pin



/*Global Variable declarations*/
	//globals for our ISR to use - probably better to set up a struct to represent our encoder....
	static volatile unsigned int encoder_btn_event = 0;
	static volatile int direction = 0;
	
	//this should be a static within the read_enc() fn, but that crashes SDCC 
	//due to https://sourceforge.net/p/sdcc/bugs/2741/ and https://sourceforge.net/p/sdcc/bugs/3161/
	static unsigned long encoder_accel = 1;

	//timer variables, used to track the last time a process has been run
	unsigned int encoder_polled = 0; //track encoder inputs, to determine velocity

	//strings for our display
	char modes[3][9]={"SINE    ","TRIANGLE","SQUARE  "};
	
//main.h