#define SYS_TICK_PRESCALE_10HZ		0
#define SYS_TICK_PRESCALE_1HZ		10

#define STATO_AUDIO_DISCONNESSO		0
#define STATO_AUDIO_CONNESSO		1
#define STATO_AUDIO_RIPRODUZIONE	2
#define STATO_AUDIO_TONO		3
#define STATO_AUDIO_ADC			4

#define SAMPLES_BUFFER_SIZE                (1024) ///< deve essere ^2
#define SAMPLES_BUFFER_SIZE_MASK           (SAMPLES_BUFFER_SIZE - 1)
#define SINE_INCREMENT                  0.314

#define DEFAULT_SYNTH_FREQUENCY		1359000UL

#define SOGLIA_TEMPERATURA	2048
#define SOGLIA_CORRENTE		2048
#define SOGLIA_DIRETTA		2048
#define SOGLIA_RIFLESSA		2048

#define max(x,y) (((x) >= (y)) ? (x) : (y))

// SYS
extern uint8_t sys_tick, sys_tick_prescale, pwm_tick;

// UART
extern UART_HandleTypeDef huart1;
#define UART_RX_BUF_SIZE 64
extern uint8_t UART_RX_buf[UART_RX_BUF_SIZE];

// SYNTH
extern uint32_t freq;

// ADC1
extern uint16_t adc1_valore;

// ADC2
extern uint16_t adc2_valori[4];
extern uint8_t adc2_done, adc_blocco, adc_allarmi[4];

// audio
extern uint16_t  sample_value;
extern uint8_t stato_audio;
extern double sine_increment;
extern uint16_t samples_ringbuf[SAMPLES_BUFFER_SIZE]; ///< buffer ad anello dei dati RX
extern uint32_t samples_ringbuf_input_index, samples_ringbuf_output_index;
extern uint8_t usb_audio_tick;

// VU
void adc_rileva_soglie(uint16_t *adc_valori);

// MOD
extern uint16_t pwm_value1, pwm_value2, pwm_value3, pwm_value4;
extern uint8_t rails_number;

extern UART_HandleTypeDef huart1;
extern ADC_HandleTypeDef hadc1;
extern ADC_HandleTypeDef hadc2;


// funzie
uint32_t sat_sub(uint16_t x, uint16_t y);
uint16_t u16_sine(void);
uint16_t u12_sine(void);
uint16_t u11_sine(void);
void store_sample(uint16_t sample);
void store_samples(uint16_t *data, uint32_t size);
uint16_t get_sample(void);
uint16_t get_adc_sample(void);
uint32_t ringbuf_increment(uint32_t *index, uint32_t buff_size_mask);