AS7262 datasheet(21/48 Pages) OSRAM

21 / 48 page

Page 20

Datasheet, Public

Document Feedback

[v4-00] 2022-Nov-30

AS7262 − Detailed Description

I²C Virtual Register Read Access

I²C Virtual Register Byte Read shows the pseudocode necessary

to read virtual registers on the AS7262. 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 (setting bit 7 to indicate a pending write).

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 implementation of the external I²C master device.

AS7262 数据表(PDF) 21 Page - OSRAM GmbH

AS7262 数据表(HTML) 21 Page - OSRAM GmbH

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

数据表下载