AS7265X datasheet(27/64 Pages) OSRAM

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[v1-04] 2018-Jul-09

AS7265x − Detailed Description

I²C Virtual Register Byte Read, detailed below, shows the

pseudocode necessary to read virtual registers on the AS72651.

Note that in this case, reading a virtual register, the register

address is not modified.

I²C Virtual Register Byte Read

Pseudocode

Poll I²C slave STATUS register;

If TX_VALID bit is 0, the virtual register address for the read may be written;

Send a virtual register address;

Poll I²C slave STATUS register;

If RX_VALID bit is 1, the read data is ready;

Read the data.

Sample Code

uint8_t i2cm_AS72xx_read(uint8_t virtualReg)

{

volatile uint8_t status, d;

while (1)

{

// Read slave I²C status to see if the read buffer is ready.

status = i2cm_read(I2C_AS72XX_SLAVE_STATUS_REG) ;

if ((status & I2C_AS72XX_SLAVE_TX_VALID) == 0)

// No inbound TX pending at slave. Okay to write now.

break;

}

// Send the virtual register address (disabling bit 7 to indicate a read).

i2cm_write(I2C_AS72XX_SLAVE_WRITE_REG, virtualReg);

while (1)

{

// Read the slave I²C status to see if our read data is available.

status = i2cm_read(I2C_AS72XX_SLAVE_STATUS_REG);

if ((status & I2C_AS72XX_SLAVE_RX_VALID)!= 0)

// Read data is ready.

break;

}

// Read the data to complete the operation.

d = i2cm_read(I2C_AS72XX_SLAVE_READ_REG) ;

return d;s

}

The details of the i2cm_read() and i2cm_write() functions in

previous figures are dependent upon the nature and implemen-

tation of the external I²C master device.

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