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i2c_tools.ino
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/*
--------------------------------------
i2c tools for Arduino
*/
#include <Wire.h>
#define DEBUG 0
#define CHAR_SPACE 0x100
#define CHAR_LINE 0x101
#define CHAR_X 0x102
enum Command_t
{
COMMAND_DETECT,
COMMAND_DUMP,
COMMAND_GET,
COMMAND_SET,
COMMAND_HELP,
COMMAND_SET_VAR,
COMMAND_GET_VAR,
};
enum Variable_t
{
VAR_SPEED,
};
enum PrintMode_t
{
MODE_PRINT_NORMAL,
MODE_PRINT_SHOW_ASCCI
};
enum ModeDetect_t
{
MODE_DETECT_FAST,
MODE_DETECT_READ_ONLY,
MODE_DETECT_WRITE_ONLY,
MODE_DETECT_READWRITE
};
enum ModeDump_t
{
MODE_DUMP_NORMAL,
MODE_DUMP_AUTOINCREMENT,
MODE_DUMP_NORMAL_WITHOUTWRITE,
MODE_DUMP_AUTOINCREMENT_WITHOUTWRITE
};
enum ModeGet_t
{
MODE_GET_NORMAL,
MODE_GET_WRITE_READ
};
enum ModeSet_t
{
MODE_SET_NORMAL,
MODE_SET_WRITEREGISTERONLY,
MODE_SET_SHORTWRITE
};
enum PrintHexMode_t
{
PRINT_HEX_MODE_LEDING_ZERO = 0x1,
PRINT_HEX_MODE_WITH_PREFIX = 0x2,
};
#define ARG_MAX_COUNT 4
#define DATA_LENGTH 256
//ARG_MAX_COUNT * (max length of number(bin == 32 + 2) + space) + command + space + CR + NL + (end of string)
#define SERIALBUFFER_LENGTH ARG_MAX_COUNT * ((32 + 2) + 1) + 1 + 1 + 1 + 1 + 1
int16_t data[DATA_LENGTH + 1];
char serialbuffer[SERIALBUFFER_LENGTH + 16];
void setup()
{
Wire.begin();
Serial.begin(115200);
while(!Serial);
printHelp();
#if (DEBUG == 1)
Serial.print(F("SCL=")); Serial.println(digitalRead(SCL));
Serial.print(F("SDA=")); Serial.println(digitalRead(SDA));
#endif
}
void loop()
{
int16_t buffer_pos = 0;
int16_t temp = 0, i;
buffer_pos = Serial.readBytesUntil('\n', serialbuffer, SERIALBUFFER_LENGTH - 1);
// add null termination and trim buffer length if new line found
i = 0;
while(i < buffer_pos && serialbuffer[i] != '\n' && serialbuffer[i] != '\r')
{
i++;
}
serialbuffer[i] = 0;
buffer_pos = i;
if(buffer_pos > 0)
{
#if (DEBUG == 1)
//terminal echo
Serial.print(F("ECHO: ")); Serial.write((byte*)serialbuffer, buffer_pos); Serial.println();
#endif
temp = handelCommand(serialbuffer, buffer_pos);
if(temp != 0)
{
#if (DEBUG == 1)
Serial.print(F("return value= ")); Serial.println(temp);
#endif
printHelp();
}
buffer_pos = 0;
serialFlush();
}
}
void serialFlush()
{
while(Serial.available() > 0)
{
Serial.read();
}
}
/*
* expets a zero terminatet string
* retun on success 0
* 1 no valid command found
* 21-24 error while converting arguments
*/
uint8_t handelCommand(char* buffer, int16_t buffer_length)
{
Command_t command;
uint8_t arg_count = 0;
int32_t arg[ARG_MAX_COUNT + 1];
int16_t pos = 0;
//find the command
pos = getCommand(buffer, buffer_length, pos, &command);
if(pos < 0) return 1;
//find all arguments and store in arg[]
pos = getArguments(buffer, buffer_length, pos, arg, &arg_count);
//run the command
RunCommand(command, arg, arg_count);
return 0;
}
/*
* return new position in buffer
* or -1 on error
*/
int16_t getCommand(char* buffer, int16_t buffer_length, int16_t pos, Command_t *command)
{
if((buffer_length > 1) && !serialbuffer[pos] == ' ') return -1;
if(buffer[pos] == '0') *command = COMMAND_DETECT;
else if(buffer[pos] == '1') *command = COMMAND_DUMP;
else if(buffer[pos] == '2') *command = COMMAND_GET;
else if(buffer[pos] == '3') *command = COMMAND_SET;
else if((buffer[pos] == 'h') || (serialbuffer[pos] == 'H')) *command = COMMAND_HELP;
else if((buffer[pos] == 's') || (serialbuffer[pos] == 'S')) *command = COMMAND_SET_VAR;
else if((buffer[pos] == 'g') || (serialbuffer[pos] == 'G')) *command = COMMAND_GET_VAR;
else return -1;
pos++;
#if (DEBUG == 1)
Serial.print(F("Command= ")); Serial.println(*command);
#endif
return pos;
}
/*
* return new position in buffer
* or -1 on error
*/
int16_t getArguments(char* buffer, int16_t buffer_length, int16_t pos, int32_t *arg, uint8_t *argc)
{
*argc = 0;
while(pos < buffer_length && *argc < ARG_MAX_COUNT && buffer[pos])
{
pos = read_number(buffer, buffer_length, pos, &(arg[*argc])); //get number from string
#if (DEBUG == 1)
Serial.print("read number ret:");
Serial.println(pos);
#endif
if(pos < 0)
{
return -1; //return if there is an error
}
(*argc)++;
}
#if (DEBUG == 1)
Serial.print(F("arg count= "));
Serial.println(*argc);
for(int16_t i = 0; i < *argc;i++)
{
Serial.print(F("arg["));
Serial.print(i);
Serial.print(F("]= "));
Serial.println(arg[i]);
}
#endif
//if there to many arg. return an error
if(*argc > ARG_MAX_COUNT)
{
return -1;
}
else
{
return pos;
}
}
int16_t RunCommand(Command_t command, int32_t *arg, int8_t argc)
{
switch(command)
{
case COMMAND_DETECT:
{
if(argc != 0 && argc != 2 && argc != 3) return -1;
if(argc >= 2 && !ValidateNumber(arg[0], 0, 255) && ValidateNumber(arg[1], 0, 255) && arg[0] > arg[1]) return -1;
if(argc == 3 && !ValidateNumber(arg[2], MODE_DETECT_FAST, MODE_DETECT_READWRITE)) return -1;
if(argc == 0) i2cdetect();
else if(argc == 2) i2cdetect(arg[0], arg[1]);
else if(argc == 3) i2cdetect(arg[0], arg[1], (ModeDetect_t)arg[2]);
break;
}
case COMMAND_DUMP:
{
if(argc != 1 && argc != 3 && argc != 4) return -1;
if(!ValidateNumber(arg[0], 0, 255)) return -1;
if(argc >= 3 && !ValidateNumber(arg[1], 0, 255) && !ValidateNumber(arg[2], 0, 255)) return -1;
if(argc == 4 && !ValidateNumber(arg[3], MODE_DUMP_NORMAL, MODE_DUMP_AUTOINCREMENT_WITHOUTWRITE)) return -1;
if(argc == 1) i2cdump(arg[0]);
else if(argc == 3) i2cdump(arg[0], arg[1], arg[2]);
else if(argc == 4) i2cdump(arg[0], arg[1], arg[2], (ModeDump_t)arg[3]);
break;
}
case COMMAND_GET:
{
if(argc != 1 && argc != 2) return -1;
if(!ValidateNumber(arg[0], 0, 255)) return -1;
if(argc == 2 && !ValidateNumber(arg[1], 0, 255)) return -1;
if(argc == 1) i2cget(arg[0]);
if(argc == 2) i2cget(arg[0], arg[1]);
break;
}
case COMMAND_SET:
{
if(argc != 3 ) return -1;
if(!ValidateNumber(arg[0], 0, 255) &&
!ValidateNumber(arg[1], 0, 255) &&
!ValidateNumber(arg[2], 0, 255)) return -1;
if(argc == 3) i2cset(arg[0], arg[1], arg[2]);
break;
}
case COMMAND_HELP:
{
printHelp();
break;
}
case COMMAND_SET_VAR:
{
if(argc != 2) return -1;
if(!ValidateNumber(arg[0], VAR_SPEED, VAR_SPEED)) return -1;
if(arg[0] == VAR_SPEED && !ValidateNumber(arg[1], 0, 400000)) return -1;
if(argc == 2) VarSet((Variable_t)arg[0], arg[1]);
break;
}
case COMMAND_GET_VAR:
{
if(argc != 1) return -1;
if(!ValidateNumber(arg[0], VAR_SPEED, VAR_SPEED)) return -1;
if(argc == 1) VarPrint((Variable_t)arg[0]);
break;
}
default:
{
return -1;
}
}
return 0;
}
bool ValidateNumber(int32_t number, int32_t min, int32_t max)
{
return number >= min && number <= max;
}
/*
* return new position
* on error return
* -1 end of buffer reached without number found
* -2 a not alowed charagter in buffer, Allowed sign are [0-9]&[a-f]&[A-F] and space
* -3 if base is 2 and found a sign witch is not 0 1
* -4 if base is 10 and found a sign witch is not[0-9]
*/
int16_t read_number(char* buffer, int16_t buffer_length, int16_t pos, int32_t* number)
{
uint8_t numberBase = 10;
*number = 0;
//remove all leadings free spaces
while(buffer[pos] == ' ')
{
if(++pos >= buffer_length) return -1; //remove all leading space or new lines
}
while(pos < buffer_length)
{
//if there is an x, set base to hex
//if there are more than one x or b, or x are in the middel of the number, it will fail
if(*number == 0 && numberBase == 10 && (buffer[pos] == 'x' || buffer[pos] == 'X')) numberBase = 16;
else if(*number == 0 && numberBase == 10 && (buffer[pos] == 'b' || buffer[pos] == 'b')) numberBase = 2;
// if there is an free space, end off string, or an new line, break the loop
else if((buffer[pos] == ' ') || (buffer[pos] == 0) || (buffer[pos] == '\n') || (buffer[pos] == '\r')) break;
// if there is an signe outside the range, return an error
else if(!isHexadecimalDigit(buffer[pos])) return -2;
// if base the base is 2, and the is an signe over 1, return an error
else if((numberBase == 2) && (buffer[pos] > '1')) return -3;
// if base the base is 10, and the is an signe over 9, return an error
else if((numberBase == 10) && (buffer[pos] > '9')) return -4;
// base 16 character are check implice before
else
{
*number *= numberBase;
char c = buffer[pos];
if(c >= 'A'/* || c >= 'a'*/) c -= 7;
*number += c & 0x0f;
}
pos++;
}
return pos;
}
void printHelp(void)
{
Serial.println(F(" i2c-tools Help Page"));
Serial.println(F("===================================================================="));
Serial.println(F("Command's :"));
Serial.println(F("0 = i2cdetect"));
Serial.println(F("1 = i2cdump"));
Serial.println(F("2 = i2cget"));
Serial.println(F("3 = i2cset"));
Serial.println(F("g = get a variable"));
Serial.println(F("s = set a variable"));
Serial.println(F("h = show this help page"));
Serial.println();
Serial.println(F("i2cdetect [start stop [mode]]"));
Serial.println(F(" Mode's:"));
Serial.println(F(" 0 = Fast detect, send a start condition"));
Serial.println(F(" 1 = Just try to read"));
Serial.println(F(" 2 = Send a single write 0x00 on the bus"));
Serial.println(F(" 3 = Send a single write 0x00, and try to read a register"));
Serial.println();
Serial.println(F("i2cdump address [start stop [mode]]"));
Serial.println(F(" Mode's:"));
Serial.println(F(" 0 = Read one register at once"));
Serial.println(F(" 1 = Use for devices with auto increment"));
Serial.println(F(" 2 = Read one register at once, Do not send write comand"));
Serial.println(F(" 3 = Use for devices with auto increment, Do not send write command"));
Serial.println();
Serial.println(F("i2cget address [register]"));
Serial.println(F("i2cset address register value"));
Serial.println();
Serial.println(F("Example: '0 0x20 0x50'"));
Serial.println(F("Detects devicecs from addresses from 0x20 to 0x50"));
Serial.println();
Serial.println(F("get var"));
Serial.println(F("set var value"));
Serial.println(F(" Variables:"));
Serial.println(F(" 0 = clk speed 1 - 400000"));
Serial.println();
Serial.println(F("All numbers can types as bin/hex/dec, except the command number"));
Serial.println();
Serial.println(F("Set your terminal to 'LF' line ending"));
}
void VarSet(Variable_t var, int32_t value)
{
switch(var)
{
case VAR_SPEED:
{
//testet on Atmel328p
// TWPS1 TWPS0 Prescaler Value
// 0 0 1
// 0 1 4
// 1 0 16
// 1 1 64
//
// CPU Clock frequency
// SCL frequency = -----------------------
// 16 + 2(TWBR) ⋅ 4^TWPS
uint8_t divider = 0;
uint16_t speed;
speed = ((F_CPU / value) - 16) / 2;
while(speed >= 256)
{
speed /= 4;
divider++;;
}
TWBR = speed;
if((divider & 0x01) != (TWSR & (1 << TWPS0))) TWSR ^= 1 << TWPS0;
if((divider & 0x02) != (TWSR & (1 << TWPS1))) TWSR ^= 1 << TWPS1;
break;
}
default:break;
}
}
int32_t VarGet(Variable_t var)
{
switch(var)
{
case VAR_SPEED:
{
#if (DEBUG == 1)
Serial.print(F("TWBR")); Serial.println(TWBR);
Serial.print(F("TWSR & 3")); Serial.println(TWSR & 0x03);
#endif
return (F_CPU / (16 + 2*TWBR * pow(4, TWSR & 0x03 )));
}
default:
return 0;
}
}
void VarPrint(Variable_t var)
{
switch(var)
{
case VAR_SPEED:
{
Serial.print(VarGet(var) / 1000); Serial.println(F("kHz"));
break;
}
default:break;
}
}
void i2cdetect(void)
{
i2cdetect(0x03, 0x77);
}
void i2cdetect(uint8_t start, uint8_t stop)
{
i2cdetect(start, stop, MODE_DETECT_FAST);
}
void i2cdetect(uint8_t start, uint8_t stop, ModeDetect_t mode)
{
uint16_t address = 0;
boolean detectWrite = false, detectRead = false;
int16_t ret = -1;
switch(mode)
{
case MODE_DETECT_FAST: detectWrite = false; detectRead = false; break;
case MODE_DETECT_READ_ONLY: detectWrite = false; detectRead = true; break;
case MODE_DETECT_WRITE_ONLY: detectWrite = true; detectRead = false; break;
case MODE_DETECT_READWRITE: detectWrite = true; detectRead = true; break;
default:break;
}
//
while(address < start)
{
data[address] = CHAR_SPACE;
address++;
}
do {
#if (DEBUG == 1)
Serial.print(F("Begin transmistion:")); Serial.println(address);
#endif
Wire.beginTransmission((uint8_t)address);
if(detectWrite == true)
{
Wire.write(0x00);
}
ret = Wire.endTransmission();
if(ret == 0)
{
if(detectRead == true)
{
Wire.requestFrom(address, 1);
if(Wire.available() > 0)
{
while(Wire.available())
Wire.read();
data[address] = address;
}
else
{
data[address] = CHAR_LINE;
}
}
else
{
data[address] = address;
}
}
else
{
data[address] = CHAR_LINE;
}
} while(++address <= stop);
printdata(data, DATA_LENGTH, MODE_PRINT_NORMAL, stop);
}
void i2cdump(uint8_t address)
{
i2cdump(address, 0, 0xff, MODE_DUMP_NORMAL);
}
void i2cdump(uint8_t address, uint8_t start, uint8_t stop)
{
i2cdump(address, start, stop, MODE_DUMP_NORMAL);
}
void i2cdump(uint8_t address, uint8_t start, uint8_t stop, ModeDump_t mode)
{
int16_t pos = 0;
boolean autoincrement = false;
boolean write_reg = true;
uint8_t ret_value = 0;
switch(mode)
{
case MODE_DUMP_NORMAL: autoincrement = false; write_reg = true; break;
case MODE_DUMP_AUTOINCREMENT: autoincrement = true; write_reg = true; break;
case MODE_DUMP_NORMAL_WITHOUTWRITE : autoincrement = false; write_reg = false; break;
case MODE_DUMP_AUTOINCREMENT_WITHOUTWRITE: autoincrement = true; write_reg = false; break;
default: break;
}
while(pos < start)
{
data[pos] = CHAR_SPACE;
pos++;
}
if(autoincrement == false)
{
do
{
if(write_reg == true)
{
Wire.beginTransmission(address);
Wire.write(pos);
ret_value = Wire.endTransmission();
}
if(ret_value == 0)
{
Wire.requestFrom((int)address, 1);
if(Wire.available())
{
data[pos] = Wire.read();
}
else
{
data[pos] = CHAR_X;
}
}
else
{
data[pos] = CHAR_X;
}
pos++;
} while(pos <= stop);
}
else if(mode == MODE_DUMP_AUTOINCREMENT)
{
if(write_reg == true)
{
Wire.beginTransmission(address);
Wire.write(pos);
ret_value = Wire.endTransmission();
}
if(ret_value == 0)
{
Wire.requestFrom((int)address, stop - start);
while(Wire.available())
{
data[pos] = Wire.read();
pos++;
}
}
while(pos < stop)
{
data[pos] = CHAR_X;
pos++;
}
}
printdata(data, DATA_LENGTH, MODE_PRINT_SHOW_ASCCI, stop);
}
void i2cget(uint8_t address)
{
int16_t ret = 0;
ret = i2cget(address, 0 , MODE_GET_NORMAL);
if(ret >= 0)
{
printHex(ret, (PrintHexMode_t)(PRINT_HEX_MODE_LEDING_ZERO | PRINT_HEX_MODE_WITH_PREFIX));
Serial.println();
}
else
{
Serial.print(F("Error:")); Serial.println(ret);
}
}
void i2cget(uint8_t address, uint8_t reg_address)
{
int16_t ret = 0;
ret = i2cget(address, reg_address , MODE_GET_WRITE_READ);
if(ret >= 0)
{
printHex(ret, (PrintHexMode_t)(PRINT_HEX_MODE_LEDING_ZERO | PRINT_HEX_MODE_WITH_PREFIX));
Serial.println();
}
else
{
Serial.print(F("Error:")); Serial.println(ret);
}
}
int16_t i2cget(uint8_t address, uint8_t reg_address, ModeGet_t mode)
{
int16_t temp = 0, ret = -1;
if(mode == MODE_GET_WRITE_READ)
{
Wire.beginTransmission(address);
Wire.write(reg_address);
temp = Wire.endTransmission();
}
if((mode == MODE_GET_WRITE_READ && temp == 0) || mode == MODE_GET_NORMAL)
{
Wire.requestFrom((int)address, 1);
if(Wire.available())
{
ret = Wire.read();
}
else
{
ret = -5;
}
}
else
{
ret = -temp;
}
return ret;
}
void i2cset(uint8_t address, uint8_t reg_address, uint8_t value)
{
int16_t ret;
ret = i2cset(address, reg_address , value, MODE_SET_NORMAL);
if(ret < 0)
{
Serial.print(F("Error")); Serial.println(ret);
}
}
int16_t i2cset(uint8_t address, uint8_t reg_address, uint8_t value, ModeSet_t mode)
{
int ret = -1;
Wire.beginTransmission(address);
if((mode == MODE_SET_NORMAL) || (mode == MODE_SET_WRITEREGISTERONLY))
{
Wire.write(reg_address);
}
if(mode == MODE_SET_NORMAL)
{
Wire.write(value);
}
ret = Wire.endTransmission();
return ret;
}
void printdata(int16_t* buffer, int16_t buffer_length)
{
printdata(buffer, buffer_length, MODE_PRINT_NORMAL, buffer_length);
}
/*
* fields in buffer array
* < 0x100 will be shown as hex
* 0x100 = ' '
* 0x101 = '--' in hex field, '.' in ascci field
* 0x102 = 'XX' in hex field, '.' in ascci field
*
* mode 0, print hex only
* mode 1, print hex and ascci
*/
void printdata(int16_t* buffer, int16_t buffer_length, PrintMode_t mode, uint8_t stop)
{
boolean print_ascci = false;
int16_t pos = 0;
uint8_t x_data_count = 0;
switch(mode)
{
case MODE_PRINT_SHOW_ASCCI: print_ascci = true; break;
case MODE_PRINT_NORMAL:
default:break;
}
// print header
Serial.print(F(" 0 1 2 3 4 5 6 7 8 9 A B C D E F"));
if(print_ascci == true)
{
Serial.print(F(" 0123456789abcdef"));
}
Serial.println();
do
{
// if new line print row header
if((pos & 0x0F) == 0x00)
{
printHex(pos, PRINT_HEX_MODE_LEDING_ZERO);
Serial.print(F(": "));
}
x_data_count = 0;
do
{
if(buffer[pos] <= 0xff)
{
printHex(buffer[pos], PRINT_HEX_MODE_LEDING_ZERO);
}
else if(buffer[pos] == CHAR_LINE)
{
Serial.print(F("--"));
}
else if(buffer[pos] == CHAR_X)
{
Serial.print(F("XX"));
}
else /*if(buffer[pos] == CHAR_SPACE)*/
{
Serial.print(F(" "));
}
Serial.write(' ');
pos++;
x_data_count++;
} while(((pos & 0x0f) != 0x00) && (pos < buffer_length) && (pos <= stop));
if(print_ascci == true)
{
Serial.write(' ');
uint8_t i = 0;
while((i+x_data_count) <= 0x0f)
{
i++;
Serial.print(F(" "));
}
do
{
if((buffer[pos - x_data_count] >= 0x20) && (buffer[pos - x_data_count] != 0x7F)
&& (buffer[pos - x_data_count] < 0xFF))
{
Serial.write(buffer[pos - x_data_count]);
}
else
{
Serial.write('.');
}
} while(--x_data_count > 0);
}
Serial.println();
} while( (pos <= buffer_length) && (pos <= stop));
}
void printHex(uint8_t value, PrintHexMode_t mode)
{
if(mode & PRINT_HEX_MODE_WITH_PREFIX) Serial.print(F("0x"));
if(mode & PRINT_HEX_MODE_LEDING_ZERO && value < 0x10)
{
Serial.write('0');
}
Serial.print(value, HEX);
}