DRV10987: I2C read error

Hello

I used DRV10983 before, and via I2C interface, can read various register's value properly.

But after change to DRV10987, I couldn't read any register's value.

The two device's addresses are same as 101 0010b.

But each registers are different not only address but register data wide.

So I followed 'I2C serial interface' of datasheet and some test result waveform in this forum (e2e.ti.com/.../737265

But basically, both I2C protocols are different so I'm still confusing.

Even I tried both way, still not success to get register value.

Here is my code & oscilloscope waveform.

Please let me know which mistake I did.

Thanks.

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#define DRV_ADDR 0xA4 // DRV10983 I2C Slave Address Write [0b1010 010x - x: write(0) & read(1)]
#define CONFIG_3 0x92 // Configuration 3 Register [bit 7:6 - OpenCurr | 20W: 10 | 45W: 11]

void I2C_Start(void)
{
SDA = 1;

SDA_DIR = OUT; BUS_DIR = 1; delay_us(10);

SDA = 1; delay_us(10);
SCL = 1; delay_us(10);
SDA = 0; delay_us(10);
SCL = 0; delay_us(10);
}

void I2C_Stop(void)
{
SDA_DIR = OUT; BUS_DIR = 1; delay_us(10);

SDA = 0; delay_us(10);
SCL = 1; delay_us(10);
SDA = 1; delay_us(10);
SCL = 0; delay_us(10);
}

void I2C_Ack_Recieve(void)
{
SDA_DIR = IN; BUS_DIR = 0; delay_us(10);

SCL = 1; delay_us(10);
SCL = 0; delay_us(10);
}

void I2C_Ack_Transmit(void)
{
SDA = 0;

SDA_DIR = OUT; BUS_DIR = 1; delay_us(10);

SCL = 1; delay_us(10);
SCL = 0; delay_us(10);
}

void I2C_Nak_Transmit(void)
{
SDA = 1;

SDA_DIR = OUT; BUS_DIR = 1; delay_us(10);

SCL = 1; delay_us(10);
SCL = 0; delay_us(10);
}

void I2C_Write(unsigned char data)
{
unsigned char i;

SDA_DIR = OUT; BUS_DIR = 1; delay_us(10);

SCL = 0; delay_us(10);

// 8bit transmit
for(i=0;i<8;i++)
{
// Send fron MSB
if(((0x80 >> i) & data) == 0) SDA = 0;
else SDA = 1;
delay_us(10);

SCL = 1; delay_us(10);
SCL = 0;
}
}

unsigned char I2C_Read_Format(unsigned char device, unsigned char address)
{
unsigned char i;
unsigned char value;

I2C_Start();
I2C_Write(device);
I2C_Ack_Recieve();
I2C_Write(address);
I2C_Ack_Recieve();
I2C_Start();
I2C_Write(device | 0x01);
I2C_Ack_Recieve();

//////////////////////////////////////////////////////////

SDA_DIR = IN; BUS_DIR = 0; delay_us(10);

value = 0;

// Upper 8bit recieve
for(i=0;i<8;i++)
{
SCL = 1; delay_us(10);
SCL = 0; delay_us(10);
}

I2C_Ack_Transmit();

//////////////////////////////////////////////////////////

SDA_DIR = IN; BUS_DIR = 0; delay_us(10);

// Lower 8bit recieve
for(i=0;i<8;i++)
{
SCL = 1; delay_us(10);

if(SDA) value |= 0x01 << (7 - i);

SCL = 0; delay_us(10);

}

I2C_Nak_Transmit();

//////////////////////////////////////////////////////////

I2C_Stop();

return value;
}