Trigger Types

There are numerous options for triggering on a waveform. Each option allows you to specify precisely when a waveform should be captured.

Contents:

• Edge Trigger
  • Edge Slope
    • Rising
    • Falling
    • Both
  • Level
  • Source
• Pulse Trigger
  • Pulse Boundary
    • Minimum Width
    • Maximum Width
    • Minimum And Maximum Width
  • Level
  • Source
• UART Trigger
  • Trigger On Start Bit
  • Trigger On Error Frame
  • Trigger On Check Error
  • Trigger On Data
  • Level
  • Source
• I2C Trigger
  • Trigger On Start
  • Trigger On Restart
  • Trigger On Stop
  • Trigger On NACK
  • Trigger On Address
  • Trigger On Data
  • Trigger On Address and Data
  • Level
  • Source
• SPI Trigger
  • Set Clock Edge Slope of Data Sample
    • Sample On Positive Clock Slope
    • Sample On Negative Clock Slope
  • Set SPI Data Condition
  • Trigger On Timeout
  • Trigger On CS
    • CS Idle High
    • CS IDLE Low

Trigger Source

Every trigger type has 1 or more trigger sources. Often the trigger source (the waveform responsible for initiating the trigger) and the target source (the waveform being captured) are the same, but they need not be.

set_trigger_sources.py

from lager import Net, NetType

sck = Net.get('I2C.SCK',
         type=NetType.Analog,
         setup_function=setup_nets,
         teardown_function=teardown_nets)

sda = Net.get('I2C.SDA',
         type=NetType.Analog,
         setup_function=setup_nets,
         teardown_function=teardown_nets)

sck.trigger_settings.i2c.set_source(sck, sda)

vbat = Net.get('VBAT',
         type=NetType.Analog,
         setup_function=setup_nets,
         teardown_function=teardown_nets)

vbat.trigger_settings.edge.set_source(vbat)

Set Trigger Sources

 ~  lager analog I2C.SCK trigger i2c --source-scl I2C.SCK --source-sda I2C.SDA --dut 1
 ~  lager analog VBAT trigger edge --source VBAT --dut 1