AS7225 datasheet(22/76 Pages) OSRAM

Il numero della parte	AS7225

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AS7225

I²C Slave Interface

Datasheet

• PUBLIC

DS000496

• v2-00 • 2019-Jun-28

│ 21

8.3.1

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) ;

AS7225 Scheda tecnica(PDF) 22 Page - OSRAM GmbH