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/*
* Octave arduino i2c interface
* Copyright (C) 2018 John Donoghue <john.donoghue@ieee.org>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "settings.h"
#include "OctaveI2CLibrary.h"
#define ARDUINO_SCANI2C 0
#define ARDUINO_CONFIGI2C 1
// replaces below as diff data format
//#define ARDUINO_WRITEI2C 2
//#define ARDUINO_READI2C 3
//#define ARDUINO_WRITEI2CREG 4
//#define ARDUINO_READI2CREG 5
// new ids as new data
#define ARDUINO_WRITEI2C 6
#define ARDUINO_READI2C 7
#define ARDUINO_WRITEI2CREG 8
#define ARDUINO_READI2CREG 9
#ifdef USE_I2C
#include <Wire.h>
static uint8_t i2c_enabled[2] = { false, false };
static uint8_t i2c_address = 0;
#if !defined(WIRE_INTERFACES_COUNT)
# if defined(ARDUINO_ARDUINO_NANO33BLE)
# define WIRE_INTERFACES_COUNT 2
# else
# if defined(WIRE_HOWMANY)
# define WIRE_INTERFACES_COUNT WIRE_HOWMANY
# else
# define WIRE_INTERFACES_COUNT 1
# endif
# endif
#endif
#if !defined(ARDUINO_ARCH_ESP32)
#define I2C_SUPPORTS_ENDCALL 1
#endif
#endif
OctaveI2CLibrary::OctaveI2CLibrary (OctaveArduinoClass &oc)
{
libName = "I2C";
oc.registerLibrary (this);
}
void
OctaveI2CLibrary::commandHandler (uint8_t cmdID, uint8_t* data, uint8_t datasz)
{
switch (cmdID)
{
#ifdef USE_I2C
case ARDUINO_WRITEI2C:
case ARDUINO_WRITEI2CREG:
{
if (datasz < 3 || datasz > 32)
{
// bus
// address
// data
sendInvalidNumArgsMsg ();
}
else
{
if (data[0] >= WIRE_INTERFACES_COUNT || data[0] > 1)
{
sendErrorMsg_P (ERRORMSG_INVALID_DEVICE);
return;
}
if (data[0] == 0)
{
Wire.beginTransmission (data[1]); // should be i2c_address
byte c;
for(c=2;c<datasz;c++)
Wire.write (data[c]);
Wire.endTransmission ();
}
#if WIRE_INTERFACES_COUNT > 1
if (data[0] == 1)
{
Wire1.beginTransmission (data[1]); // should be i2c_address
byte c;
for(c=2;c<datasz;c++)
Wire1.write (data[c]);
Wire1.endTransmission ();
}
#endif
data[1] = 1;
sendResponseMsg (cmdID,data, 2);
}
break;
}
case ARDUINO_READI2C:
{
if (datasz != 3)
{
// bus
// address
// numbytes
sendInvalidNumArgsMsg ();
}
else
{
if (data[0] >= WIRE_INTERFACES_COUNT || data[0] > 1)
{
sendErrorMsg_P (ERRORMSG_INVALID_DEVICE);
return;
}
if (data[0] == 0)
{
Wire.requestFrom (data[1], (size_t)data[2]);
byte c = 0;
byte l = data[2];
if (l > 5) sendWaitMsg ();
datasz = 1;
for (c=0;c<=l;c++)
{
if (Wire.available ())
{
data[datasz] = Wire.read ();
datasz ++;
}
}
}
#if WIRE_INTERFACES_COUNT > 1
if (data[0] == 1)
{
Wire1.requestFrom (data[1], (size_t)data[2]);
byte c = 0;
byte l = data[2];
if (l > 5) sendWaitMsg ();
datasz = 1;
for (c=0;c<=l;c++)
{
if (Wire1.available ())
{
data[datasz] = Wire1.read ();
datasz ++;
}
}
}
#endif
sendResponseMsg (cmdID,data, datasz);
}
break;
}
case ARDUINO_READI2CREG:
{
if (datasz < 5)
{
// bus
// address
// regsz
// reg
// numbytes
sendInvalidNumArgsMsg ();
}
else if (datasz != data[2]+4)
{
sendInvalidNumArgsMsg ();
}
else
{
if (data[0] >= WIRE_INTERFACES_COUNT || data[0] > 1)
{
sendErrorMsg_P (ERRORMSG_INVALID_DEVICE);
return;
}
if (data[0] == 0)
{
Wire.beginTransmission (data[1]);
byte c = 0;
for (c=0;c<data[2];c++)
{
Wire.write (data[3+c]);
}
Wire.endTransmission (false);
byte l = data[3+data[2]];
Wire.requestFrom (data[1], (size_t)l);
if(l > 5) sendWaitMsg ();
datasz = 2;
for (c=0;c<=l;c++)
{
if (Wire.available ())
{
data[datasz] = Wire.read ();
datasz ++;
}
}
}
#if WIRE_INTERFACES_COUNT > 1
if (data[0] == 1)
{
Wire1.beginTransmission (data[1]);
byte c = 0;
for (c=0;c<data[2];c++)
{
Wire1.write (data[3+c]);
}
Wire1.endTransmission (false);
byte l = data[3+data[2]];
Wire1.requestFrom (data[1], (size_t)l);
if(l > 5) sendWaitMsg ();
datasz = 2;
for (c=0;c<=l;c++)
{
if (Wire1.available ())
{
data[datasz] = Wire1.read ();
datasz ++;
}
}
}
#endif
sendResponseMsg (cmdID,data, datasz);
}
break;
}
case ARDUINO_SCANI2C:
{
if (datasz != 2)
{
sendInvalidNumArgsMsg ();
}
else
{
byte error = 1;
// bus 0
// address
if (data[0] >= WIRE_INTERFACES_COUNT || data[0] > 1)
{
sendErrorMsg_P (ERRORMSG_INVALID_DEVICE);
return;
}
if (!i2c_enabled[data[0]])
{
if(data[0] == 0) Wire.begin ();
#if WIRE_INTERFACES_COUNT > 1
if(data[0] == 1) Wire1.begin ();
#endif
}
if (data[0] == 0)
{
Wire.beginTransmission (data[1]);
error = Wire.endTransmission ();
}
#if WIRE_INTERFACES_COUNT > 1
if (data[0] == 1)
{
Wire1.beginTransmission (data[1]);
error = Wire1.endTransmission ();
}
#endif
if (error == 0)
data[2] = 1;
else
data[2] = 0;
if (!i2c_enabled[data[0]])
{
#if defined (I2C_SUPPORTS_ENDCALL)
if(data[0] == 0) Wire.end ();
# if WIRE_INTERFACES_COUNT > 1
if(data[0] == 1) Wire1.end ();
# endif
#endif
}
sendResponseMsg (cmdID, data, 3);
}
break;
}
case ARDUINO_CONFIGI2C:
{
if (datasz == 2 || datasz == 3 || datasz == 5)
{
// i2c bus 0
// enable 1
// i2caddress (optional)
// bitratehi
// birtarelo
if (data[0] >= WIRE_INTERFACES_COUNT || data[0] > 1)
{
sendErrorMsg_P (ERRORMSG_INVALID_DEVICE);
return;
}
// enable
if (data[1] == 1)
{
i2c_enabled[data[0]] = 1;
if (data[0] == 0)
{
// TODO: i dont think need any more as setting i2c as pullup inputs before making it i2c
#if defined(ARDUINO_AVR_NANO_EVERY) || defined (ARDUINO_NANO_RP2040_CONNECT)
// arduino every A4,A5 pin is connected to 2 pins each on the micro controller
// so need ensure that the non I2C pins are pulled hi so doesnt effect the i2c pins
pinMode(18, INPUT_PULLUP);
pinMode(19, INPUT_PULLUP);
#endif
}
if (datasz>= 3)
i2c_address = data[2];
else
i2c_address = 0;
if (data[0] == 0)
{
if (i2c_address > 0)
Wire.begin (i2c_address);
else
Wire.begin ();
if (datasz == 5)
{
int32_t bitrate = (((uint32_t)data[3])<<8) | ((uint32_t)data[4]);
Wire.setClock (bitrate*1000L);
}
}
#if WIRE_INTERFACES_COUNT > 1
if (data[0] == 1)
{
if (i2c_address > 0)
Wire1.begin (i2c_address);
else
Wire1.begin ();
if (datasz == 5)
{
int32_t bitrate = (((uint32_t)data[3])<<8) | ((uint32_t)data[4]);
Wire1.setClock (bitrate*1000L);
}
}
#endif
}
else
{
// disable
#if defined (I2C_SUPPORTS_ENDCALL)
if (data[0] == 0) Wire.end ();
# if WIRE_INTERFACES_COUNT > 1
if (data[0] == 1) Wire1.end ();
# endif
#endif
i2c_enabled[data[0]] = 0;
}
sendResponseMsg (cmdID, data, datasz);
}
else if (datasz == 1)
{
// query config of device
// i2c id
// enable
// address
if (data[0] >= WIRE_INTERFACES_COUNT || data[0] > 1)
{
sendErrorMsg_P (ERRORMSG_INVALID_DEVICE);
return;
}
data[1] = i2c_enabled[data[0]];
data[2] = i2c_address;
sendResponseMsg (cmdID,data, 3);
}
else
{
sendInvalidNumArgsMsg ();
}
break;
}
#endif
default:
sendUnknownCmdIDMsg ();
break;
}
}
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