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PDB: Programmable Delay Block

## Overview

The KSDK provides a peripheral driver for the Programmable Delay Block (PDB) module of Kinetis devices.

The PDB driver includes a basic PDB counter, trigger generators for ADC, DAC, and pulse-out.

The basic PDB counter can be used as a general programmable time with an interrupt. The counter increases automatically with the divided clock signal after it is triggered to start by an external trigger input or the software trigger. There are "milestones" for output trigger event. When the counter is equal to any of these "milestones", the corresponding trigger is generated and sent out to other modules. These "milestones" are for the following:

- Counter delay interrupt, which is the interrupt for the PDB module
- ADC pre-trigger to trigger the ADC conversion
- DAC interval trigger to trigger the DAC buffer and move the buffer read pointer
- Pulse-out triggers to generate a single of rising and falling edges, which can be assembled to a window.

The "milestone" values have a flexible load mode. To call the APIs to set these value is equivalent to writing data to their buffer. The loading event occurs as the load mode describes. This design ensures that all "milestones" can be updated at the same time.

# Typical use case

## Working as basic DPB counter with a PDB interrupt.

int main(void)
{
// ...
EnableIRQ(DEMO_PDB_IRQ_ID);
// ...
// Configures the PDB counter.
PDB_GetDefaultConfig(&pdbConfigStruct);
PDB_Init(DEMO_PDB_INSTANCE, &pdbConfigStruct);
// Configures the delay interrupt.
PDB_SetModulusValue(DEMO_PDB_INSTANCE, 1000U);
PDB_SetCounterDelayValue(DEMO_PDB_INSTANCE, 1000U); // The available delay value is less than or equal to the modulus value.
PDB_EnableInterrupts(DEMO_PDB_INSTANCE, kPDB_DelayInterruptEnable);
PDB_DoLoadValues(DEMO_PDB_INSTANCE);
while (1)
{
// ...
g_PdbDelayInterruptFlag = false;
PDB_DoSoftwareTrigger(DEMO_PDB_INSTANCE);
while (!g_PdbDelayInterruptFlag)
{
}
}
}
void DEMO_PDB_IRQ_HANDLER_FUNC(void)
{
// ...
g_PdbDelayInterruptFlag = true;
PDB_ClearStatusFlags(DEMO_PDB_INSTANCE, kPDB_DelayEventFlag);
}

## Working with an additional trigger. The ADC trigger is used as an example.

void DEMO_PDB_IRQ_HANDLER_FUNC(void)
{
PDB_ClearStatusFlags(DEMO_PDB_INSTANCE, kPDB_DelayEventFlag);
g_PdbDelayInterruptCounter++;
g_PdbDelayInterruptFlag = true;
}
void DEMO_PDB_InitADC(void)
{
adc16_config_t adc16ConfigStruct;
adc16_channel_config_t adc16ChannelConfigStruct;
ADC16_GetDefaultConfig(&adc16ConfigStruct);
ADC16_Init(DEMO_PDB_ADC_INSTANCE, &adc16ConfigStruct);
#if defined(FSL_FEATURE_ADC16_HAS_CALIBRATION) && FSL_FEATURE_ADC16_HAS_CALIBRATION
ADC16_EnableHardwareTrigger(DEMO_PDB_ADC_INSTANCE, false);
ADC16_DoAutoCalibration(DEMO_PDB_ADC_INSTANCE);
#endif /* FSL_FEATURE_ADC16_HAS_CALIBRATION */
ADC16_EnableHardwareTrigger(DEMO_PDB_ADC_INSTANCE, true);
adc16ChannelConfigStruct.channelNumber = DEMO_PDB_ADC_USER_CHANNEL;
adc16ChannelConfigStruct.enableInterruptOnConversionCompleted = true; /* Enable the interrupt. */
#if defined(FSL_FEATURE_ADC16_HAS_DIFF_MODE) && FSL_FEATURE_ADC16_HAS_DIFF_MODE
adc16ChannelConfigStruct.enableDifferentialConversion = false;
#endif /* FSL_FEATURE_ADC16_HAS_DIFF_MODE */
ADC16_SetChannelConfig(DEMO_PDB_ADC_INSTANCE, DEMO_PDB_ADC_CHANNEL_GROUP, &adc16ChannelConfigStruct);
}
void DEMO_PDB_ADC_IRQ_HANDLER_FUNCTION(void)
{
uint32_t tmp32;
tmp32 = ADC16_GetChannelConversionValue(DEMO_PDB_ADC_INSTANCE, DEMO_PDB_ADC_CHANNEL_GROUP); /* Read to clear COCO flag. */
g_AdcInterruptCounter++;
g_AdcInterruptFlag = true;
}
int main(void)
{
// ...
EnableIRQ(DEMO_PDB_IRQ_ID);
EnableIRQ(DEMO_PDB_ADC_IRQ_ID);
// ...
// Configures the PDB counter.
PDB_GetDefaultConfig(&pdbConfigStruct);
PDB_Init(DEMO_PDB_INSTANCE, &pdbConfigStruct);
// Configures the delay interrupt.
PDB_SetModulusValue(DEMO_PDB_INSTANCE, 1000U);
PDB_SetCounterDelayValue(DEMO_PDB_INSTANCE, 1000U); // The available delay value is less than or equal to the modulus value.
PDB_EnableInterrupts(DEMO_PDB_INSTANCE, kPDB_DelayInterruptEnable);
// Configures the ADC pre-trigger.
pdbAdcPreTriggerConfigStruct.enablePreTriggerMask = 1U << DEMO_PDB_ADC_PRETRIGGER_CHANNEL;
pdbAdcPreTriggerConfigStruct.enableOutputMask = 1U << DEMO_PDB_ADC_PRETRIGGER_CHANNEL;
pdbAdcPreTriggerConfigStruct.enableBackToBackOperationMask = 0U;
PDB_SetADCPreTriggerConfig(DEMO_PDB_INSTANCE, DEMO_PDB_ADC_TRIGGER_CHANNEL, &pdbAdcPreTriggerConfigStruct);
PDB_SetADCPreTriggerDelayValue(DEMO_PDB_INSTANCE,
DEMO_PDB_ADC_TRIGGER_CHANNEL, DEMO_PDB_ADC_PRETRIGGER_CHANNEL, 200U);
// The available pre-trigger delay value is less than or equal to the modulus value.
PDB_DoLoadValues(DEMO_PDB_INSTANCE);
// Configures the ADC.
DEMO_PDB_InitADC();
while (1)
{
g_PdbDelayInterruptFlag = false;
g_AdcInterruptFlag = false;
PDB_DoSoftwareTrigger(DEMO_PDB_INSTANCE);
while ((!g_PdbDelayInterruptFlag) || (!g_AdcInterruptFlag))
{
}
// ...
}
}

## Data Structures

struct | pdb_config_t
| PDB module configuration. More...
struct | pdb_adc_pretrigger_config_t
| PDB ADC Pre-Trigger configuration. More...
struct | pdb_dac_trigger_config_t
| PDB DAC trigger configuration. More...

## Enumerations

enum | _pdb_status_flags { kPDB_LoadOKFlag = PDB_SC_LDOK_MASK, kPDB_DelayEventFlag = PDB_SC_PDBIF_MASK }
| PDB flags. More...
enum | _pdb_adc_pretrigger_flags { kPDB_ADCPreTriggerChannel0Flag = PDB_S_CF(1U << 0), kPDB_ADCPreTriggerChannel1Flag = PDB_S_CF(1U << 1), kPDB_ADCPreTriggerChannel0ErrorFlag = PDB_S_ERR(1U << 0), kPDB_ADCPreTriggerChannel1ErrorFlag = PDB_S_ERR(1U << 1) }
| PDB ADC PreTrigger channel flags. More...
enum | _pdb_interrupt_enable { kPDB_SequenceErrorInterruptEnable = PDB_SC_PDBEIE_MASK, kPDB_DelayInterruptEnable = PDB_SC_PDBIE_MASK }
| PDB buffer interrupts. More...
enum | pdb_load_value_mode_t { kPDB_LoadValueImmediately = 0U, kPDB_LoadValueOnCounterOverflow = 1U, kPDB_LoadValueOnTriggerInput = 2U, kPDB_LoadValueOnCounterOverflowOrTriggerInput = 3U }
| PDB load value mode. More...
enum | pdb_prescaler_divider_t { kPDB_PrescalerDivider1 = 0U, kPDB_PrescalerDivider2 = 1U, kPDB_PrescalerDivider4 = 2U, kPDB_PrescalerDivider8 = 3U, kPDB_PrescalerDivider16 = 4U, kPDB_PrescalerDivider32 = 5U, kPDB_PrescalerDivider64 = 6U, kPDB_PrescalerDivider128 = 7U }
| Prescaler divider. More...
enum | pdb_divider_multiplication_factor_t { kPDB_DividerMultiplicationFactor1 = 0U, kPDB_DividerMultiplicationFactor10 = 1U, kPDB_DividerMultiplicationFactor20 = 2U, kPDB_DividerMultiplicationFactor40 = 3U }
| Multiplication factor select for prescaler. More...

enum

pdb_trigger_input_source_t {
kPDB_TriggerInput0 = 0U,
kPDB_TriggerInput1 = 1U,
kPDB_TriggerInput2 = 2U,
kPDB_TriggerInput3 = 3U,
kPDB_TriggerInput4 = 4U,
kPDB_TriggerInput5 = 5U,
kPDB_TriggerInput6 = 6U,
kPDB_TriggerInput7 = 7U,
kPDB_TriggerInput8 = 8U,
kPDB_TriggerInput9 = 9U,
kPDB_TriggerInput10 = 10U,
kPDB_TriggerInput11 = 11U,
kPDB_TriggerInput12 = 12U,
kPDB_TriggerInput13 = 13U,
kPDB_TriggerInput14 = 14U,
kPDB_TriggerSoftware = 15U
}

| Trigger input source. More...

## Driver version

#define | FSL_PDB_DRIVER_VERSION (MAKE_VERSION(2, 0, 1))
| PDB driver version 2.0.1. More...

## Initialization

void | PDB_Init (PDB_Type *base, const pdb_config_t *config)
| Initializes the PDB module. More...
void | PDB_Deinit (PDB_Type *base)
| De-initializes the PDB module. More...
void | PDB_GetDefaultConfig (pdb_config_t *config)
| Initializes the PDB user configuration structure. More...
static void | PDB_Enable (PDB_Type *base, bool enable)
| Enables the PDB module. More...

## Basic Counter

static void | PDB_DoSoftwareTrigger (PDB_Type *base)
| Triggers the PDB counter by software. More...
static void | PDB_DoLoadValues (PDB_Type *base)
| Loads the counter values. More...
static void | PDB_EnableDMA (PDB_Type *base, bool enable)
| Enables the DMA for the PDB module. More...
static void | PDB_EnableInterrupts (PDB_Type *base, uint32_t mask)
| Enables the interrupts for the PDB module. More...
static void | PDB_DisableInterrupts (PDB_Type *base, uint32_t mask)
| Disables the interrupts for the PDB module. More...
static uint32_t | PDB_GetStatusFlags (PDB_Type *base)
| Gets the status flags of the PDB module. More...
static void | PDB_ClearStatusFlags (PDB_Type *base, uint32_t mask)
| Clears the status flags of the PDB module. More...
static void | PDB_SetModulusValue (PDB_Type *base, uint32_t value)
| Specifies the period of the counter. More...
static uint32_t | PDB_GetCounterValue (PDB_Type *base)
| Gets the PDB counter's current value. More...
static void | PDB_SetCounterDelayValue (PDB_Type *base, uint32_t value)
| Sets the value for PDB counter delay event. More...

## ADC Pre-Trigger

static void | PDB_SetADCPreTriggerConfig (PDB_Type *base, uint32_t channel, pdb_adc_pretrigger_config_t *config)
| Configures the ADC PreTrigger in PDB module. More...
static void | PDB_SetADCPreTriggerDelayValue (PDB_Type *base, uint32_t channel, uint32_t preChannel, uint32_t value)
| Sets the value for ADC Pre-Trigger delay event. More...
static uint32_t | PDB_GetADCPreTriggerStatusFlags (PDB_Type *base, uint32_t channel)
| Gets the ADC Pre-Trigger's status flags. More...
static void | PDB_ClearADCPreTriggerStatusFlags (PDB_Type *base, uint32_t channel, uint32_t mask)
| Clears the ADC Pre-Trigger's status flags. More...

## Pulse-Out Trigger

static void | PDB_EnablePulseOutTrigger (PDB_Type *base, uint32_t channelMask, bool enable)
| Enables the pulse out trigger channels. More...
static void | PDB_SetPulseOutTriggerDelayValue (PDB_Type *base, uint32_t channel, uint32_t value1, uint32_t value2)
| Sets event values for pulse out trigger. More...

## Data Structure Documentation

struct pdb_config_t

### Data Fields

pdb_load_value_mode_t | loadValueMode
| Select the load value mode. More...
pdb_prescaler_divider_t | prescalerDivider
| Select the prescaler divider. More...
pdb_divider_multiplication_factor_t | dividerMultiplicationFactor
| Multiplication factor select for prescaler. More...
pdb_trigger_input_source_t | triggerInputSource
| Select the trigger input source. More...
bool | enableContinuousMode
| Enable the PDB operation in Continuous mode. More...

#### Field Documentation

pdb_load_value_mode_t pdb_config_t::loadValueMode

pdb_prescaler_divider_t pdb_config_t::prescalerDivider

pdb_divider_multiplication_factor_t pdb_config_t::dividerMultiplicationFactor

pdb_trigger_input_source_t pdb_config_t::triggerInputSource

bool pdb_config_t::enableContinuousMode

struct pdb_adc_pretrigger_config_t

### Data Fields

uint32_t | enablePreTriggerMask
| PDB Channel Pre-Trigger Enable. More...
uint32_t | enableOutputMask
| PDB Channel Pre-Trigger Output Select. More...
uint32_t | enableBackToBackOperationMask
| PDB Channel Pre-Trigger Back-to-Back Operation Enable. More...

#### Field Documentation

uint32_t pdb_adc_pretrigger_config_t::enablePreTriggerMask

uint32_t pdb_adc_pretrigger_config_t::enableOutputMask

PDB channel's corresponding pre-trigger asserts when the counter reaches the channel delay register.

uint32_t pdb_adc_pretrigger_config_t::enableBackToBackOperationMask

Back-to-back operation enables the ADC conversions complete to trigger the next PDB channel pre-trigger and trigger output, so that the ADC conversions can be triggered on next set of configuration and results registers.

struct pdb_dac_trigger_config_t

### Data Fields

bool | enableExternalTriggerInput
| Enables the external trigger for DAC interval counter. More...
bool | enableIntervalTrigger
| Enables the DAC interval trigger. More...

#### Field Documentation

bool pdb_dac_trigger_config_t::enableExternalTriggerInput

bool pdb_dac_trigger_config_t::enableIntervalTrigger

## Macro Definition Documentation

#define FSL_PDB_DRIVER_VERSION (MAKE_VERSION(2, 0, 1))

## Enumeration Type Documentation

enum _pdb_status_flags

Enumerator
kPDB_LoadOKFlag | This flag is automatically cleared when the values in buffers are loaded into the internal registers after the LDOK bit is set or the PDBEN is cleared.
kPDB_DelayEventFlag | PDB timer delay event flag.

enum _pdb_adc_pretrigger_flags

Enumerator
kPDB_ADCPreTriggerChannel0Flag | Pre-Trigger 0 flag.
kPDB_ADCPreTriggerChannel1Flag | Pre-Trigger 1 flag.
kPDB_ADCPreTriggerChannel0ErrorFlag | Pre-Trigger 0 Error.
kPDB_ADCPreTriggerChannel1ErrorFlag | Pre-Trigger 1 Error.

enum _pdb_interrupt_enable

Enumerator
kPDB_SequenceErrorInterruptEnable | PDB sequence error interrupt enable.
kPDB_DelayInterruptEnable | PDB delay interrupt enable.

enum pdb_load_value_mode_t

Selects the mode to load the internal values after doing the load operation (write 1 to PDBx_SC[LDOK]). These values are for:

- PDB counter (PDBx_MOD, PDBx_IDLY)
- ADC trigger (PDBx_CHnDLYm)
- DAC trigger (PDBx_DACINTx)
- CMP trigger (PDBx_POyDLY)

Enumerator
kPDB_LoadValueImmediately | Load immediately after 1 is written to LDOK.
kPDB_LoadValueOnCounterOverflow | Load when the PDB counter overflows (reaches the MOD register value).
kPDB_LoadValueOnTriggerInput | Load a trigger input event is detected.
kPDB_LoadValueOnCounterOverflowOrTriggerInput | Load either when the PDB counter overflows or a trigger input is detected.

enum pdb_prescaler_divider_t

Counting uses the peripheral clock divided by multiplication factor selected by times of MULT.

Enumerator
kPDB_PrescalerDivider1 | Divider x1.
kPDB_PrescalerDivider2 | Divider x2.
kPDB_PrescalerDivider4 | Divider x4.
kPDB_PrescalerDivider8 | Divider x8.
kPDB_PrescalerDivider16 | Divider x16.
kPDB_PrescalerDivider32 | Divider x32.
kPDB_PrescalerDivider64 | Divider x64.
kPDB_PrescalerDivider128 | Divider x128.

enum pdb_divider_multiplication_factor_t

Selects the multiplication factor of the prescaler divider for the counter clock.

Enumerator
kPDB_DividerMultiplicationFactor1 | Multiplication factor is 1.
kPDB_DividerMultiplicationFactor10 | Multiplication factor is 10.
kPDB_DividerMultiplicationFactor20 | Multiplication factor is 20.
kPDB_DividerMultiplicationFactor40 | Multiplication factor is 40.

enum pdb_trigger_input_source_t

Selects the trigger input source for the PDB. The trigger input source can be internal or external (EXTRG pin), or the software trigger. See chip configuration details for the actual PDB input trigger connections.

Enumerator
kPDB_TriggerInput0 | Trigger-In 0.
kPDB_TriggerInput1 | Trigger-In 1.
kPDB_TriggerInput2 | Trigger-In 2.
kPDB_TriggerInput3 | Trigger-In 3.
kPDB_TriggerInput4 | Trigger-In 4.
kPDB_TriggerInput5 | Trigger-In 5.
kPDB_TriggerInput6 | Trigger-In 6.
kPDB_TriggerInput7 | Trigger-In 7.
kPDB_TriggerInput8 | Trigger-In 8.
kPDB_TriggerInput9 | Trigger-In 9.
kPDB_TriggerInput10 | Trigger-In 10.
kPDB_TriggerInput11 | Trigger-In 11.
kPDB_TriggerInput12 | Trigger-In 12.
kPDB_TriggerInput13 | Trigger-In 13.
kPDB_TriggerInput14 | Trigger-In 14.
kPDB_TriggerSoftware | Trigger-In 15, software trigger.

## Function Documentation

void PDB_Init | ( | PDB_Type * | base,
|  | const pdb_config_t * | config
| ) |  |

This function is to make the initialization for PDB module. The operations includes are:

- Enable the clock for PDB instance.
- Configure the PDB module.
- Enable the PDB module.

Parameters

  base | PDB peripheral base address.
  config | Pointer to configuration structure. See "pdb_config_t".

void PDB_Deinit | ( | PDB_Type * | base | ) |

Parameters

  base | PDB peripheral base address.

void PDB_GetDefaultConfig | ( | pdb_config_t * | config | ) |

This function initializes the user configuration structure to default value. The default values are:

* config->loadValueMode = kPDB_LoadValueImmediately;
* config->prescalerDivider = kPDB_PrescalerDivider1;
* config->dividerMultiplicationFactor = kPDB_DividerMultiplicationFactor1;
* config->triggerInputSource = kPDB_TriggerSoftware;
* config->enableContinuousMode = false;
*

Parameters

  config | Pointer to configuration structure. See "pdb_config_t".

static void PDB_Enable | ( | PDB_Type * | base,
|  | bool | enable
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  enable | Enable the module or not.

static void PDB_DoSoftwareTrigger | ( | PDB_Type * | base | ) |

inlinestatic

Parameters

  base | PDB peripheral base address.

static void PDB_DoLoadValues | ( | PDB_Type * | base | ) |

inlinestatic

This function is to load the counter values from their internal buffer. See "pdb_load_value_mode_t" about PDB's load mode.

Parameters

  base | PDB peripheral base address.

static void PDB_EnableDMA | ( | PDB_Type * | base,
|  | bool | enable
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  enable | Enable the feature or not.

static void PDB_EnableInterrupts | ( | PDB_Type * | base,
|  | uint32_t | mask
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  mask | Mask value for interrupts. See "_pdb_interrupt_enable".

static void PDB_DisableInterrupts | ( | PDB_Type * | base,
|  | uint32_t | mask
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  mask | Mask value for interrupts. See "_pdb_interrupt_enable".

static uint32_t PDB_GetStatusFlags | ( | PDB_Type * | base | ) |

inlinestatic

Parameters

  base | PDB peripheral base address.

Returns
  Mask value for asserted flags. See "_pdb_status_flags".

static void PDB_ClearStatusFlags | ( | PDB_Type * | base,
|  | uint32_t | mask
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  mask | Mask value of flags. See "_pdb_status_flags".

static void PDB_SetModulusValue | ( | PDB_Type * | base,
|  | uint32_t | value
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  value | Setting value for the modulus. 16-bit is available.

static uint32_t PDB_GetCounterValue | ( | PDB_Type * | base | ) |

inlinestatic

Parameters

  base | PDB peripheral base address.

Returns
  PDB counter's current value.

static void PDB_SetCounterDelayValue | ( | PDB_Type * | base,
|  | uint32_t | value
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  value | Setting value for PDB counter delay event. 16-bit is available.

static void PDB_SetADCPreTriggerConfig | ( | PDB_Type * | base,
|  | uint32_t | channel,
|  | pdb_adc_pretrigger_config_t * | config
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  channel | Channel index for ADC instance.
  config | Pointer to configuration structure. See "pdb_adc_pretrigger_config_t".

static void PDB_SetADCPreTriggerDelayValue | ( | PDB_Type * | base,
|  | uint32_t | channel,
|  | uint32_t | preChannel,
|  | uint32_t | value
| ) |  |

inlinestatic

This function is to set the value for ADC Pre-Trigger delay event. IT Specifies the delay value for the channel's corresponding pre-trigger. The pre-trigger asserts when the PDB counter is equal to the setting value here.

Parameters

  base | PDB peripheral base address.
  channel | Channel index for ADC instance.
  preChannel | Channel group index for ADC instance.
  value | Setting value for ADC Pre-Trigger delay event. 16-bit is available.

static uint32_t PDB_GetADCPreTriggerStatusFlags | ( | PDB_Type * | base,
|  | uint32_t | channel
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  channel | Channel index for ADC instance.

Returns
  Mask value for asserted flags. See "_pdb_adc_pretrigger_flags".

static void PDB_ClearADCPreTriggerStatusFlags | ( | PDB_Type * | base,
|  | uint32_t | channel,
|  | uint32_t | mask
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  channel | Channel index for ADC instance.
  mask | Mask value for flags. See "_pdb_adc_pretrigger_flags".

static void PDB_EnablePulseOutTrigger | ( | PDB_Type * | base,
|  | uint32_t | channelMask,
|  | bool | enable
| ) |  |

inlinestatic

Parameters

  base | PDB peripheral base address.
  channelMask | Channel mask value for multiple pulse out trigger channel.
  enable | Enable the feature or not.

static void PDB_SetPulseOutTriggerDelayValue | ( | PDB_Type * | base,
|  | uint32_t | channel,
|  | uint32_t | value1,
|  | uint32_t | value2
| ) |  |

inlinestatic

This function is used to set event values for pulse output trigger. These pulse output trigger delay values specify the delay for the PDB Pulse-Out. Pulse-Out goes high when the PDB counter is equal to the pulse output high value (value1). Pulse-Out goes low when the PDB counter is equal to the pulse output low value (value2).

Parameters

  base | PDB peripheral base address.
  channel | Channel index for pulse out trigger channel.
  value1 | Setting value for pulse out high.
  value2 | Setting value for pulse out low.