twi atmega 128, twi atmega 128 Опции

[Oleg_DI]

помогите разобраться с twi функция работает на 16 меге а на 128 jtag выдаёт ошибку условия старт.Аппаратно на двух разных платах тоже самое.
TWI_BIT_RATE= 1; //Bit Rate 100 kBit/s
TWI_STATUS = 0x00; //Prescaler 1:1
TWI_CONTROL = 0x04; //enable twi
TWAR = 0x0d;
старт TWCR = 0xa4;

[Oleg_DI]

Да фьюзы соответствуют
//===================================================
//Error code I2C Bus
//===================================================
#define ERROR_START 0x10
#define ERROR_MASTER_ASK 0x11
#define ERROR_MT_DATA_ASK 0x12
#define ERROR_START_REPEAT 0x13
#define ERROR_ASK_READ 0x14
#define ERROR_ASK_DATA_READ 0x15
#define NO_ERROR 0x00
//===================================================
#define HARD_START_CONDITION 0xA4
#define HARD_STOP_CONDITION 0x94
#define HARD_RESTORE_REG 0x84
#define HARD_RESTORE_ASK 0xC4

//================================================================
// Инициализация RTC
//================================================================
void hardRTCInit(void)
{ unsigned char r;
r = i2cReadBlock(ADDRES, 0x0E, sizeof(testDS), (unsigned char *)&testDS);
r = 0x40;
i2cWriteBlock(ADDRES, 0x0E, 1, &r);
r = i2cReadBlock(ADDRES, 0x02, sizeof(testDS), (unsigned char *)&testDS);
}

//================================================================
//Read block data from I2C Bus
//Чтение блока данных по шине I2C
//================================================================
unsigned char i2cReadBlock(unsigned char addres, unsigned char subaddres, unsigned char size, unsigned char *data)
{
static unsigned char _size;
_size = size;
//Start condition
TWCR = HARD_START_CONDITION;
while (!(TWCR & 0x80));
if ((TWSR & 0xF8) != _START)
{
TWCR = HARD_STOP_CONDITION; return ERROR_START;
}
//Send addres
TWDR = addres;
TWCR = HARD_RESTORE_REG;
while (!(TWCR & 0x80));
if ((TWSR & 0xF8) != _MT_SLA_ACK)
{
TWCR = HARD_STOP_CONDITION; return ERROR_ASK_READ;
}
//Send subaddres
TWDR = subaddres;
TWCR = HARD_RESTORE_REG;
while (!(TWCR & 0x80));
if ((TWSR & 0xF8) != _MT_DATA_ACK)
{
TWCR = HARD_STOP_CONDITION; return ERROR_MT_DATA_ASK;
}
//Start condition
TWCR = HARD_START_CONDITION;
while (!(TWCR & 0x80));
if ((TWSR & 0xF8) != _START_REPEAT)
{ TWCR = HARD_STOP_CONDITION; return ERROR_START;
}
//Send addres
TWDR = addres+1;
TWCR = HARD_RESTORE_REG;
while (!(TWCR & 0x80));
if ((TWSR & 0xF8) != _MT_SLA_ACK_READ)
{ TWCR = HARD_STOP_CONDITION; return ERROR_ASK_READ;
}
//Recive data
TWCR = HARD_RESTORE_ASK;
while (!(TWCR & 0x80));
if ((TWSR & 0xF8) != _MT_DATA_ACK_READ)
{ TWCR = HARD_STOP_CONDITION; return ERROR_ASK_DATA_READ;
}
if(size)
{ *data = TWDR;
++data;
_size--;
}
else _size = TWDR;
while(_size--)
{ if(!_size)
{//Send one byte of block
TWCR = HARD_RESTORE_REG;
while (!(TWCR & 0x80));
if ((TWSR & 0xF8) != _MT_DATA_NOT_ACK_READ)
{ TWCR = HARD_STOP_CONDITION; return ERROR_ASK_DATA_READ;
}
*data = TWDR;
++data;
}
else
{ TWCR = HARD_RESTORE_ASK;
while (!(TWCR & 0x80));
if ((TWSR & 0xF8) != _MT_DATA_ACK_READ)
{ TWCR = HARD_STOP_CONDITION; return ERROR_ASK_DATA_READ;
}
*data = TWDR;
++data;
}
}
TWCR = HARD_STOP_CONDITION;
return NO_ERROR;
}