Hello,
I have a LM4970 that i am programming using an Arduino,
I have the LM4970 connected correctly to the Arduino, (Vdd and I2CVdd is tied together , GND to GND, SDA and SCL is correctly connected, the ADR pin is tied to GND)
There is power going across the LM4970, 5v ish, no power on the ADR pin, etc...
For the life of me i cannot get the LM4970 to accept its own address, im sending over 0x7A, and i keep getting a NACK,
I've even trying sending over every possible combination of I2C Address, and all of them got a NACK response, anyone have any idea? I have attached my code
8255.lm4970.txt
#include <Wire.h> // for I2C
// defines for LM4970
#define LM4970_ADDR_0 0x7A // first 7 bits of address 0 (ADR = LOW)
#define LM4970_ADDR_1 0x7B // first 7 bits of address 1 (ADR = HIGH)
#define LM4970_MODE_NORM 0x00 // power up, normal I2C, no random
#define LM4970_MODE_RAND 0x04 // power up, normal I2C, random
#define LM4970_FREQ 0x50 // 6.3kHz High Pass / 15kHz PWM
#define LM4970_PATT_AUDIO 0x60 // pattern gen by audio input
#define LM4970_PATT_I2C 0x61 // pattern gen by I2C - all off
#define LM4970_CURR 0xAA // 1x current (21mA)on LED 1-3
#define LM4970_GAIN 0xEA // gain = 10dB / midband = medium
byte LM4970_Address = LM4970_ADDR_0; // using address 0 (ADR = LOW)
void setup() {
Wire.begin();
LM4970_Hello(); // light up some LEDs in I2C mode
LM4970_Init(); // set for audio control of LEDs
}
void loop(){
}
void LM4970_Init(){ // Init based on #defines above
Wire.beginTransmission(LM4970_Address);
Wire.write(LM4970_MODE_NORM); // set the mode
Wire.write(LM4970_FREQ); // set the freq
Wire.write(LM4970_PATT_AUDIO); // set the pattern
Wire.write(LM4970_CURR); // set the current
Wire.write(LM4970_GAIN); // set the gain
Wire.endTransmission();
delay(5); // safety - may not be needed
}
void LM4970_I2C_Led(boolean LED1,boolean LED2,boolean LED3){ // I2C control of LEDs
byte pattern = LM4970_PATT_I2C; // pattern set to I2C control - all off
pattern |= LED1 << 1; // shift in status for LED1
pattern |= LED2 << 2; // shift in status for LED2
pattern |= LED3 << 3; // shift in status for LED3
Wire.beginTransmission(LM4970_Address);
Wire.write(pattern); // send the command for the LEDs to light
Wire.write(LM4970_CURR); // set the current
Wire.endTransmission();
delay(5); // safety - may not be needed
}
void LM4970_Hello(){
LM4970_I2C_Led(true,false,false); // turn on LED-1
delay(500);
LM4970_I2C_Led(false,true,false); // turn on LED-2
delay(500);
LM4970_I2C_Led(false,false,true); // turn on LED-1
delay(500);
LM4970_I2C_Led(true,true,true); // turn on all 3
delay(1000);
LM4970_I2C_Led(false,false,false); // turn em off
delay(1000);
}