hello everybody,
I am interfacing ADS1115 with Nuvoton N76E003 using I2C.
I am using adc channel A0 and 5V suppy voltage.
I have connected ADDR pin of ADS1115 to GND.
When I am giving address 0x48 through master it gives 0x20 i.e.Master Transmit Address NACK as a reply.
so I am stuck here. Please find my attached code and suggest solution.
#define EEPROM_SLA 0x48
#define EEPROM_WR 0
#define EEPROM_RD 1
#define SET_BIT3 0x08
#define SET_BIT4 0x10
#define P13_OpenDrain_Mode P1M1|=SET_BIT3;P1M2|=SET_BIT3
#define P14_OpenDrain_Mode P1M1|=SET_BIT4;P1M2|=SET_BIT4
#define I2C_ACK 0
#define I2C_NACK 1
#define timeout_count 1000
void INIT_I2C(void);
void ADS1115_config();
void ADS1115_read();
void I2C_start();
void I2C_stop();
void I2C_Master_Write(unsigned char value);
unsigned int I2C_Master_Read(unsigned short a);
void main()
{
//MODIFY_HIRC_166();
//---------------------I/O DEFINATION-----------------------------
//P1M1 = 0X80; //FOR NORMAL PROGRAM
//----------------------FUNCTION CALLS----------------------------
INIT_I2C();
I2C_start();
ADS1115_config();
ADS1115_read();
I2C_stop();
while(1)
{
}
}
//----------------------------------I2C COMMUNICATION FOR DISPLAY--------------------------
void INIT_I2C(void)
{
P13_OpenDrain_Mode;
P14_OpenDrain_Mode ;
SDA = 1;
SCL = 1;
I2CPX=0; //SCL= P1.3 ,SDA=P1.4
I2CEN=1;
I2CLK=42; // 400KBPS FOR 16MHZ CLOCK
}
//_________________________ADS1115 CONFIG AND DATA BLOCK_______________________//
void I2C_start(void)
{
signed int t = timeout_count;
STA = 1;
SI = 0;
}
void I2C_stop(void)
{
signed int t = timeout_count;
SI = 0;
STO = 1;
}
void ADS1115_config()
{
I2DAT = (EEPROM_SLA | EEPROM_WR);
if(I2STAT == 0x18)
{
LED = 1;
}
I2C_Master_Write(0x01);//Command to config registers 0x01
I2C_Master_Write(0x80);//PGA: +-6.144V, Inputs: default (A0), continuous conv. mode 0x80
I2C_Master_Write(0x83);//128 SPS, Traditional comparator, active low, nonlatching, dis. ALERT/RDY 0x83
}
void I2C_Master_Write(unsigned char value)
{
I2DAT = value; //Write data to SSPBUF
}
void ADS1115_read()
{
unsigned int datah;
unsigned int datal;
//float data;
I2C_Master_Write(0x90); //0x90
I2C_Master_Write(0x00); //0x00
I2C_Master_Write(0x91); //0x91
datah = I2C_Master_Read(1);
datal = I2C_Master_Read(0);
}
unsigned int I2C_Master_Read(unsigned char ack_mode)
{
signed int t = timeout_count;
unsigned char value = 0x00;
I2DAT = (EEPROM_SLA | EEPROM_RD);
t = timeout_count;
AA = 1;
SI = 0;
while((SI==0)&&(t>0))
{
t--;
};
value = I2DAT;
if(ack_mode == I2C_NACK)
{
t = timeout_count;
AA = 0;
SI = 0;
while((SI == 0)&& (t>0))
{
t--;
};
}
return value;
}
