BL702/704/706 Reference Manual
• Enable signal
11.5.2 Read and write flags
I2C supports two working states: sending and receiving. Register PKTDIR indicates the sending or receiving status.
When it is set to 0, it indicates the sending state, and when it is set to 1, it indicates the receiving state.
11.5.3 Slave address
Each slave device connected to I2C will have a unique address. Usually the address length is 7 bits. The slave device
address will be written into the register SLVADDR. I2C will automatically shift left by 1 bit before sending it from the
device address. Transmit/receive direction bit on the low-order complement.
11.5.4 Slave register address
Slave device register address indicates the register address that I2C needs to read and write to a certain register of
the slave device. The slave device address will be written to the register I2C_SUB_ADDR, and the register I2C_CR_-
I2C_SUB_ADDR_EN needs to be set.
If the register SAEN is set to 0, the I2C master will skip the slave register address segment when transmitting.
11.5.5 Slave device address length
The slave device address length is decremented by one and written to the register SABC.
11.5.6 Data
The data part represents the data that needs to be sent to the slave device, or the data that needs to be received from
the slave device.
When I2C sends data, the data needs to be written into the I2C FIFO in word units in turn, and the data is written to
the register address I2C_FIFO_WDATA of the FIFO.
When the I2C receives data, it needs to read the data from the I2C FIFO in units of words in order, and the received
data reads the register address I2C_FIFO_RDATA of the FIFO.
11.5.7 Data length
Decrement the data length by one and write to the register PKTLEN.
BL702/704/706 Reference Manual 211/ 375
@2021 Bouffalo Lab
To Next Page
Loading...