extruder/intercom.h

#ifndef _INTERCOM_H
#define _INTERCOM_H

#include  <stdint.h>
#include  "config.h"

#ifdef HOST
  #define enable_transmit()     do { WRITE(TX_ENABLE_PIN,1);  UCSR1B &=~MASK(RXEN1); } while(0)
  #define disable_transmit()      do { WRITE(TX_ENABLE_PIN,0);  UCSR1B &= ~(MASK(TXCIE1) | MASK(UDRIE1)); UCSR1B |= MASK(RXEN1); } while(0)
#else
  #define enable_transmit()     do { WRITE(TX_ENABLE_PIN,1);  UCSR0B &= ~MASK(RXEN0); } while(0)
  #define disable_transmit()      do { WRITE(TX_ENABLE_PIN,0);  UCSR0B &= ~(MASK(TXCIE0) | MASK(UDRIE0)); UCSR0B |= MASK(RXEN0); } while(0)
#endif

enum {
  ERROR_BAD_CRC
} err_codes;

typedef struct {
  uint8_t   start; 
  uint8_t   dio;  
  uint8_t   controller_num; 
  uint8_t   control_word;   
  uint8_t   control_index;  

  union {
    int32_t   control_data_int32;
    uint32_t  control_data_uint32;
    float     control_data_float;
    uint16_t  temp[2];
  };
  uint8_t   err;  
  uint8_t   crc;  
} intercom_packet_t;

typedef union {
  intercom_packet_t packet;
  uint8_t           data[sizeof(intercom_packet_t)];
} intercom_packet;

extern intercom_packet tx;
extern intercom_packet rx;

void intercom_init(void);

void send_temperature(uint8_t index, uint16_t temperature);

uint16_t read_temperature(uint8_t index);

void set_dio(uint8_t index, uint8_t value);

uint8_t get_dio(uint8_t index);

void set_err(uint8_t err);

uint8_t get_err(void);

void start_send(void);

#define FLAG_RX_IN_PROGRESS 1
#define FLAG_TX_IN_PROGRESS 2
#define FLAG_NEW_RX         4
#define FLAG_TX_FINISHED    8
extern volatile uint8_t intercom_flags;



#endif  /* _INTERCOM_H */