Example

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The examples below list the register writes needed for common stimulation protocols. In Bonsai, each write can be sent to the device with a CreateMessage operator (from Bonsai.Harp), using the register address and type shown in the register summary, connected to the Device operator.

Constant current

Drive the LED connected to LED0 with a constant current of 200 mA:

Step	Register	Address	Type	Value
1	Led0MaxCurrent	44	Float	250
2	LedEnable	41	U8	0x01
3	Led0Current	37	Float	200

To turn the LED off, write 0 to Led0Current, or write 0x01 to LedDisable (address 42) to switch off the driver while keeping the configured current.

Pulse train

Drive the LED connected to LED0 with a 20 Hz, 10 % duty cycle pulse train at 200 mA:

Step	Register	Address	Type	Value	Notes
1	PulseFrequencyLed0	49	U8	20	20 Hz
2	PulseDutyCycleLed0	47	U8	10	10 % (5 ms on per 50 ms period)
3	Dac0Voltage	39	Float	1000	1000 mV / 5 = 200 mA
4	PulseEnable	46	U8	0x01	Start the pulse train in channel 0

To stop the pulse train, write 0x00 to PulseEnable.

note

Pulses act on the value of the Dac0Voltage register, which is why the current is configured in mV in step 3. See DAC voltage for details.

Ramp

Ramp the LED connected to LED0 up to 200 mA over 2 s, and back down to 0 mA over 500 ms:

Step	Register	Address	Type	Value	Notes
1	PulseEnable	46	U8	0x00	Ramps only work with pulses disabled
2	RampConfig	53	U8	0x03	LED0_UP and LED0_DOWN
3	RampLed0	51	U16	2000	2000 ms
4	Dac0Voltage	39	Float	1000	Ramp up to 200 mA
5	RampLed0	51	U16	500	500 ms
6	Dac0Voltage	39	Float	0	Ramp down to 0 mA, after the ramp up ends