Texas Instruments Tiva TM4C123GH6PM, User Manual

Page: 47 / 352

Analog to Digital Converter (ADC)
Parameters:
ui32Base is the base address of the ADC module.
ui32SequenceNum is the sample sequence number.
ui32Trigger is the trigger source that initiates the sample sequence; must be one of the
ADC_TRIGGER_ ∗
values.
ui32Priority
is the relative priority of the sample sequence with respect to the other sample
sequences.
Description:
This function configures the initiation criteria for a sample sequence. Valid sample sequences
range from zero to three; sequence zero will capture up to eight samples, sequences one and
two will capture up to four samples, and sequence three will capture a single sample. The
trigger condition and priority (with respect to other sample sequence execution) is set.
The ui32Trigger parameter can take on the following values:
ADC_TRIGGER_PROCESSOR - A trigger generated by the processor, via the
ROM_ADCProcessorTrigger() function.
ADC_TRIGGER_COMP0 - A trigger generated by the first analog comparator; configured
with ROM_ComparatorConfigure() .
ADC_TRIGGER_COMP1
- A trigger generated by the second analog comparator; config-
ured with ROM_ComparatorConfigure() .
ADC_TRIGGER_COMP2 - A trigger generated by the third analog comparator; configured
with ROM_ComparatorConfigure() .
ADC_TRIGGER_EXTERNAL - A trigger generated by an input from the Port B4 pin.
ADC_TRIGGER_TIMER
- A trigger generated by a timer; configured with
ROM_TimerControlTrigger() .
ADC_TRIGGER_PWM0 - A trigger generated by the first PWM generator; configured with
ROM_PWMGenIntTrigEnable() .
ADC_TRIGGER_PWM1 - A trigger generated by the second PWM generator; configured
with ROM_PWMGenIntTrigEnable() .
ADC_TRIGGER_PWM2
- A trigger generated by the third PWM generator; configured with
ROM_PWMGenIntTrigEnable() .
ADC_TRIGGER_PWM3 - A trigger generated by the fourth PWM generator; configured
with ROM_PWMGenIntTrigEnable() .
ADC_TRIGGER_ALWAYS - A trigger that is always asserted, causing the sample se-
quence to capture repeatedly (so long as there is not a higher priority source active).
The ui32Priority parameter is a value between 0 and 3, where 0 represents the highest priority
and 3 the lowest. Note that when programming the priority among a set of sample sequences,
each must have unique priority; it is up to the caller to guarantee the uniqueness of the priori-
ties.
Returns:
None.
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