I2C Bit Banging with VS1010D for Reading sensor data

[avizet]

HI!

I'm configuring the i2c communication with LMP91002 AFE device. Now I've to write the i2c_read and i2c_write method.

Can anyone please share the theory for i2c_read and i2c_write method in VS1010?

Example of MSP430 code attached below.

I2C_WRITE:

Code: Select all

/*****************************************************************************
 * Module       : HALI2C_Write
 * Description  : sends out array of data over i2c bus
 * Return       : uint8_t ACK/NACK
 *****************************************************************************/
uint8_t HALI2C_Write(uint8_t byte_count, uint8_t *data, uint8_t stop_bit){
	uint8_t i = 0;

	// handle NACK
	NACK_FLAG = 0;

	// Limit the Max num of transaction to 8 bytes per transfer
    if(byte_count > 8)
    {
    	byte_count = 8;
    }

    // controls the stop bit at the end of transaction
    STOP_BIT_Flag = stop_bit;

	// Init I2C master with counter and stop bits
	HALI2C_masterInit(0, EUSCI_B_I2C_NO_AUTO_STOP);

	//Set Master in transmit mode
     EUSCI_B_I2C_setMode(EUSCI_B0_BASE,
                         EUSCI_B_I2C_TRANSMIT_MODE
                         );

     //Enable I2C Module to start operations
     EUSCI_B_I2C_enable(EUSCI_B0_BASE);

     EUSCI_B_I2C_clearInterruptFlag(EUSCI_B0_BASE,
                                    EUSCI_B_I2C_TRANSMIT_INTERRUPT0 +
                                    EUSCI_B_I2C_NAK_INTERRUPT
                                    );

     //Enable master Receive interrupt
     EUSCI_B_I2C_enableInterrupt(EUSCI_B0_BASE,
                                 EUSCI_B_I2C_TRANSMIT_INTERRUPT0 +
                                 EUSCI_B_I2C_NAK_INTERRUPT
                                 );
     //Update global array
     TXByteCtr = byte_count;
     for(i = 0; i< byte_count; i++)
     {
    	 TXData[i] = data[i];
     }

     while (EUSCI_B_I2C_SENDING_STOP == EUSCI_B_I2C_masterIsSTOPSent
                    (EUSCI_B0_BASE)) ; // Make sure bus is free
     // start the transfer
     TXByteCtr--;	// When you reach ISR you would have sent already a byte
     EUSCI_B_I2C_masterMultiByteSendStart(EUSCI_B0_BASE, TXData[0]);

     __bis_SR_register(CPUOFF + GIE); // Enter LPM0 w/ interrupts

     //Enable I2C Module to start operations
     EUSCI_B_I2C_disable(EUSCI_B0_BASE);
     return  NACK_FLAG;
}

Thank you!