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AS7225

I²C Slave Interface

Datasheet

• PUBLIC

DS000496

• v2-00 • 2019-Jun-28

│ 19

8.2

I²C Virtual Register Write Access

I²C Virtual Resister Byte Write, detailed below, shows the pseudocode necessary to write virtual

registers on the AS7225. Note that, because the actual registers of interest are realized as virtual

registers, a means of indicating whether there is a pending read or write operation of a given virtual

used as a marker. If it is 1, then a write is pending, otherwise the slave is expecting a virtual read

operation. The pseudocode illustrates the proper technique for polling of the I²C slave status register

to ensure the slave is ready for each transaction.

8.2.1

I²C Virtual Register Byte Write

Pseudocode

Poll I²C slave STATUS register;

If TX_VALID bit is 0, a write can be performed on the interface;

Send a virtual register address and set the MSB of the register address to 1

to indicate the pending write;

Poll I²C slave STATUS register;

If TX_VALID bit is 0, the virtual register address for the write has been

received and the data may now be written;

Write the data.

Sample Code

#define I2C_AS72XX_SLAVE_STATUS_REG

0x00

#define I2C_AS72XX_SLAVE_WRITE_REG

0x01

#define I2C_AS72XX_SLAVE_READ_REG

0x02

#define I2C_AS72XX_SLAVE_TX_VALID

0x02

#define I2C_AS72XX_SLAVE_RX_VALID

0x01

void i2cm_AS72xx_write(uint8_t virtualReg, uint8_t d)

{

volatile uint8_t status ;

while (1)

{

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