TWI AT commands¶
The following commands list contains AT commands related to the two-wire interface (TWI).
List TWI instances #XTWILS¶
The #XTWILS command lists all available TWI instances.
Set command¶
The set command allows you to list all available TWI instances.
Response syntax¶
#XTWILS: <index>[[[,<index>],<index>],<index>]
The <index> parameter corresponds to the following TWI instances:
0- TWI0 (i2c0).1- TWI1 (i2c1).2- TWI2 (i2c2).3- TWI3 (i2c3).See nordic,nrf-twi.
Example¶
AT#XTWILS
#XTWILS: 2
OK
Read command¶
The read command is not supported.
Test command¶
The test command is not supported.
Write to TWI peripheral device #XTWIW¶
The #XTWIW command writes data to a TWI peripheral device.
Set command¶
The set command allows you to write data to a TWI peripheral device.
Syntax¶
#XTWIW=<index>,<dev_addr>,<data>
The
<index>parameter accepts the following integer values:0- Use TWI0 (i2c0).1- Use TWI1 (i2c1).2- Use TWI2 (i2c2).3- Use TWI3 (i2c3).
See nordic,nrf-twi.
The
<dev_addr>parameter is a hexadecimal string. It represents the peripheral device address to write to. The maximum length is 2 characters (for example, “DE” for 0xDE).The
<data>parameter is a hexadecimal string. It represents the data to be written to the peripheral device. The maximum length is 255 characters (for example, “DEADBEEF” for 0xDEADBEEF).
Response syntax¶
There is no response.
Example¶
AT#XTWIW=2,"76","D0"
OK
Read command¶
The read command is not supported.
Test command¶
The test command is not supported.
Read from TWI peripheral device #XTWIR¶
The #XTWIR command reads data from a TWI peripheral device.
Set command¶
The set command allows you to read data from a TWI peripheral device.
Syntax¶
#XTWIR=<index>,<dev_addr>,<num_read>
The
<index>parameter accepts the following integer values:0- Use TWI0 (i2c0).1- Use TWI1 (i2c1).2- Use TWI2 (i2c2).3- Use TWI3 (i2c3).
The
<dev_addr>parameter is a hexadecimal string. It represents the peripheral device address to read from. The maximum length is 2 characters (for example, “DE” for 0xDE).The
<num_read>parameter is an unsigned 8-bit integer. It represents the amount of data to read from the peripheral device. The available range is from 0 to 255 bytes.
Response syntax¶
#XTWIR:
<data>
The
<data>parameter is a hexadecimal string. It represents the data read from the peripheral device.
Example¶
AT#XTWIR=2,"76",1
#XTWIR: 61
OK
Read command¶
The read command is not supported.
Test command¶
The test command is not supported.
Write data and read from TWI peripheral device #XTWIWR¶
The #XTWIWR command writes data to a TWI peripheral device and then reads data from the device.
Set command¶
The set command allows you to first write data to a TWI peripheral device and then read the returned data.
Syntax¶
#XTWIW=<index>,<dev_addr>,<data>,<num_read>
The
<index>parameter accepts the following integer values:0- Use TWI0 (i2c0).1- Use TWI1 (i2c1).2- Use TWI2 (i2c2).3- Use TWI3 (i2c3).
See nordic,nrf-twi.
The
<dev_addr>parameter is a hexadecimal string. It represents the peripheral device address to write to. The maximum length is 2 characters (for example, “DE” for 0xDE).The
<data>parameter is a hexadecimal string. It represents the data to be written to the peripheral device. The maximum length is 255 characters (for example, “DEADBEEF” for 0xDEADBEEF).The
<num_read>parameter is an unsigned 8-bit integer. It represents the amount of data to read from the peripheral device. The available range is from 0 to 255 bytes.
Response syntax¶
#XTWIWR:
<data>
The
<data>parameter is a hexadecimal string. It represents the data read from the peripheral device.
Example¶
AT#XTWIWR=2,"76","D0",1
#XTWIWR: 61
OK
Read command¶
The read command is not supported.
Test command¶
The test command is not supported.