CTI VISA Commands
Analog Input
Enables the selected Analog Input Channel
CTI.lvlib:VisaComms.lvclass:AI Init.vi
ANAlog:INput<0|1|2>:ENable
ANA:IN<0|1|2>:EN
ANA:IN1:EN - Enables Analog Input on
Reads the value of the selected Analog Input Channel
CTI.lvlib:VisaComms.lvclass:AI Read Value.vi
ANAlog:INput<0|1|2>:VALue?"
ANA:IN<0|1|2>:VAL?
ANA:IN2:VAL? - Reads Analog Input 2 and returns a U16 integer
Analog Output (PWM)
Initialises a PWM channel
CTI.lvlib:VisaComms.lvclass:PWM Init.vi
PWM%d:INIT <Phase-Correct = 0|1>,<enable = 0|1>
PWM0:INIT 0,1 - enables PWM in A0
Set PWM duty cycle
CTI.lvlib:VisaComms.lvclass:PWM Write Duty.vi
PWM<0|1|2>:DUTY %.;<0-1>
PWM2:DUTY 0.500000 - Sets the duty cycle to an equal square wave on A2
Get PWM duty cycle
CTI.lvlib:VisaComms.lvclass:PWM Read Duty.vi
PWM<0|1|2>:DUTY?
PWM2:DUTY? -Gets the duty cycle from A2
Set PWM Frequency
CTI.lvlib:VisaComms.lvclass:PWM Write Frequency.vi
PWM<0|1|2>:FREQ <frequency in Hz>
PWM0:FREQ 2000.000000 - sets the PWM frequency on A0 to 2kHz
Get PWM Frequency
CTI.lvlib:VisaComms.lvclass:PWM Read Frequency.vi
PWM<0|1|2>:FREQ?
PWM0:FREQ? - Gets the PWM frequency on A0
Enable/Disable PWM Channel
CTI.lvlib:VisaComms.lvclass:PWM Write Enable.vi
PWM<0|1|2>:ENable <disable = 0| enable = 1>
PWM1:EN 1 - Enables PWM on A1
Digital Input/Output
Set Digital Pin Direction
CTI.lvlib:VisaComms.lvclass:GPIO Write Direction.vi
DIGital:PIN<16|17|18|19|20|21>:DIRection
DIG:PIN16:DIR In - set GPIO pin 16 to digital input
Set Digital Pin Pull Up Resistor
CTI.lvlib:VisaComms.lvclass:GPIO Write Pull.vi
DIGital:PIN<16|17|18|19|20|21>:PULL <None|Up|Down|Both>
DIG:PIN20:PULL None - Sets no resistors
DIG:PIN20:PULL Up - Sets Pull Up resistor
DIG:PIN20:PULL Down - Sets Pull Down resistor
DIG:PIN20:PULL Both - Sets both Pull-up and Pull-Down resistors
Set Digital Output
CTI.lvlib:VisaComms.lvclass:GPIO Write Value.vi
DIGital:PIN<16|17|18|19|20|21>:VALue
DIG:PIN17:VAL 1 - Set GPIO pin 17 to TRUE
Get Digital Output
CTI.lvlib:VisaComms.lvclass:GPIO Read Value.vi
DIGital:PIN<16|17|18|19|20|21>:VALue?
DIG:PIN18:VAL? - Get GPIO pin 17 value returns <0 = false|1 = true>
I2C Communications
Set Up and Initialise I2C Port
CTI.lvlib:VisaComms.lvclass:I2C Init.vi
COMM:I2C<0|1>:INIT <baud = 400000|1000000>, <SCL GPIO Pin>, <SDA GPIO Pin>
COMM:I2C0:INIT 1000000,9,8 - sets the baud rate to 1M and the I2C pins for the I2C0 connector on the grove board
Write I2C Data
CTI.lvlib:VisaComms.lvclass:I2C Write Data.vi
COMM:I2C<0|1>:DATA <Address>,#<length of text length><length of text><text>,<NoStop(F) = 0|1>
COMM:I2C1:DATA 18,#15hello,0 - Send "hello" out of I2C1 for address 18 (x12)
Read I2C Data
CTI.lvlib:VisaComms.lvclass:I2C Read Data.vi
COMM:I2C<0|1>:DATA? <Address>,<length of text>,<NoStop(F) = 0|1>
COMM:I2C1:DATA? 6,25,0 - Read 25 chars from I2C1 and address 6
SPI Communications
Set Up and Initialise SPI Port
CTI.lvlib:VisaComms.lvclass:SPI Init.vi
COMM:SPI<0>:INIT <baud = 500000|1000000>,<mode 0>,<Data Bits 7,8>,<TX GPIO Pin>,<RX GPIO Pin>,<SCK GPIO Pin>
COMM:SPI0:INIT 1000000,0,8,7,4,6 sets the baud rate to 1M and the SPI pins for the ISPI connector on the grove board
Write SPI Data
CTI.lvlib:VisaComms.lvclass:SPI Write Data.vi
COMM:SPI<0>:DATA #<length of text length><length of text><text>
COMM:SPI0:DATA #15hello - Send "hello" out of SPI0
Read SPI Data
CTI.lvlib:VisaComms.lvclass:SPI Read Data.vi
COMM:SPI<0>:DATA? <length of text>
COMM:SPI0:DATA? 25 - Read 25 chars from SPI port
UART Communications
Set Up and Initialise UART Port
CTI.lvlib:VisaComms.lvclass:UART Init.vi
COMM:UART<0|1>:INIT <baud = 9600-115200>,<TX GPIO Pin>,<RX GPIO Pin>{,<Optional termination char>}
COMM:UART0:INIT 115200,16,17,10 sets the baud rate to 115200 and the UART pins for the UART0 connector on the grove board. Optionally sets a termination character.
Write SPI Data
CTI.lvlib:VisaComms.lvclass:UART Write Data.vi
COMM:UART<0|1>:DATA #<length of text length><length of text><text>
COMM:UART1:DATA #15hello - Send "hello" out of UART0
Read UART Data
CTI.lvlib:VisaComms.lvclass:UART Read Data.vi
COMM:UART<0|1>:DATA? <length of text>
COMM:UART1:DATA? 25 - Read 25 chars from UART port