twi_nonblock.h

/*
 * twi_nonblock.h
 *
 * This file is part of Mozzi.
 *
 * Copyright 2012-2024 Marije Baalman and the Mozzi Team
 *
 * Mozzi is licensed under the GNU Lesser General Public Licence (LGPL) Version 2.1 or later.
 *
 */
 
 
#ifndef TWI_NONBLOCK_H_
#define TWI_NONBLOCK_H_
 
#include <hardware_defines.h>
// Added by TB2014 for Teensy 3 port
#if IS_AVR() // this code is only for AVRs
 
#include "Arduino.h"
#include <compat/twi.h>
 
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
 
// --- twi reading variables
  #ifndef TWI_FREQ
  #define TWI_FREQ 100000L
  #endif
 
  #ifndef TWI_BUFFER_LENGTH
  #define TWI_BUFFER_LENGTH 32
  #endif
 
  #define TWI_READY 0
  #define TWI_PRE_MRX   1
  #define TWI_MRX   2
  #define TWI_PRE_MTX   3
  #define TWI_MTX   4
  #define TWI_SRX   5
  #define TWI_STX   6
 
static volatile uint8_t twi_state;
static volatile uint8_t twi_oldstate;
// static uint8_t twiint_masrw;
static uint8_t twi_slarw;
 
static uint8_t twi_masterBuffer[TWI_BUFFER_LENGTH];
static volatile uint8_t twi_masterBufferIndex;
static uint8_t twi_masterBufferLength;
 
static volatile uint8_t twi_error;
 
#define BUFFER_LENGTH 32
static uint8_t rxBuffer[BUFFER_LENGTH];
static uint8_t rxBufferIndex = 0;
static uint8_t rxBufferLength = 0;
 
static uint8_t txAddress = 0;
static uint8_t txBuffer[BUFFER_LENGTH];
static uint8_t txBufferIndex = 0;
static uint8_t txBufferLength = 0;
 
static uint8_t transmitting;
 
 
void initialize_twi_nonblock();
 
uint8_t twowire_requestFrom(uint8_t address, uint8_t quantity);
void twowire_beginTransmission( uint8_t address );
void twowire_send( uint8_t data );
uint8_t twowire_endTransmission(void);
 
/// non-blocking functions:
uint8_t twi_initiateReadFrom(uint8_t address, uint8_t length);
void twi_continueReadFrom();
 
uint8_t twi_readMasterBuffer( uint8_t* data, uint8_t length );
 
uint8_t twi_initiateWriteTo(uint8_t address, uint8_t* data, uint8_t length );
void twi_continueWriteTo();
 
 
void twi_reply(uint8_t ack);
void twi_stop(void);
void twi_releaseBus(void);
 
/// blocking versions:
uint8_t twi_readFromBlocking(uint8_t address, uint8_t* data, uint8_t length);
uint8_t twi_writeToBlocking(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait);
 
#endif
 
#if !defined _MOZZI_TWI_HEADER_ONLY
#include "internal/twi_nonblock.hpp"
#endif
 
#endif