The document discusses an I/O hardware abstraction driver for a complex device that supports dual sample pulse width modulation (PWM). It describes functions for calculating PWM on and off delays based on frequency and duty cycle, reading analog current values, and writing PWM channel values. It also discusses the driver's internal modules for initialization, delay calculation, and sequencing of ADC reads with PWM on and off periods.

1. IoHwAbExt_Adc
IoHwAbExt_Pwm Cdd
Delay Callback
Raw Analog Data
Frequency
Duty Cycle Delays
StatusType (*Cdd_DualSamplePwmCalculateDelay)
(IoHwAbExt_Pwm_ChannelType channel,
float32 Freq,
float32 DutyCycle,
float32 *OnDelay,
float32 *OffDelay)
Std_ReturnType Cdd_Xxx_ReadFbCurrent
(float32* Current);
IoHwAbExt_BD16952
Interface-Dependency

2. IoHwAbExt_Adc
IoHwAbExt_Pwm
StatusType
(*Cdd_DualSamplePwmCalculateDelay)
(float32 Freq,
float32 DutyCycle,
float32 *OnDelay,
float32 *OffDelay)
APPLICATION
RTE
I/O Hardware Abstraction Complex Device Drivers
IoHwAb Interface Layer
MCAL
IoHwAbExt_ADC_ReadChannel
(channel, *DataBufferPtr)
Raw Analog Data
IoHwAbExt_Pwm_WriteChannel
(channel, freq, dutycycle)
Delay Callback

3. IoHwAb Adc
ADCGroups
DualPwmSample (0..1) boolean
Conversion Complete Interrupt
• On Conversion Read Adc Values
• Off Conversion Read Adc Values
PwmChannels
FreqDefaultValue (0..1)
FrequencyLimitLow (0..1)
FrequencyLimitHigh (0..1)
IoHwAb Pwm
PwmGeneral
DualPwmSampleSupport (1..1)
DualSamplePwm
OnPwmSample (0..1) boolean
OffPwmSample (0..1) boolean
Tom Channel Reference (1..1)
OnStateAdcGroupRef (0..*)
OffStateAdcGroupRef (0..*)
DMA Reference (0..1)
Pseudo Cfg Parameters when PwmOutput to be extended to DualSamplePwm
External Module Connections
PwmHwAccess
HwAccessId (0..1) DUAL_PWM_SAMPLE
McalPwmChannel (0..1)
DualSamplePwmSupportRef (0..1)

4. Channel
FreqDefaultValue (0..1)
FrequencyLimitLow (0..1)
FrequencyLimitHigh (0..1)
IoHwAb Pwm
DualSamplePwm
PwmGeneral
DualPwmSampleSupport (1..1)
DualSamplePwm
OnPwmSample (0..1) boolean
OffPwmSample (0..1) boolean
DMA Reference (0..1)
OnStateAdcGroupRef (0..*)
OffStateAdcGroupRef (0..*)
Tom Channel Reference (1..1)
Pseudo Cfg Parameters when PwmOutput to be extended to DualSamplePwm
Internal Module Connections
Init • Conversion Timing Init to read Off
State Channels
DualSampleDutyCycle
• Module to read Off State Channels defined
by PwmOutFreq when DC is 0%
• Limit values to be used
Conversion Start Interrupt
• On Conversion Start
• Off Conversion Start
PwmHwAccess
HwAccessId (0..1) DUAL_PWM_SAMPLE
McalPwmChannel (0..1)
DualSamplePwmSupportRef (0..1)
IoHwAbExt_DualSamplePwm.c

5. I/O Hardware
Abstraction
Complex Device
Drivers
IoHwAb Interface Layer
Analog Inputs Pwm Outputs
Current
Voltage
Frequency
Duty Cycle
Delay Callback
Frequency/Duty Cycle
Delays
Raw Analog Data

6. Determine On & Off Delay
Command
Frequency & Duty
Cycle
Cdd_DualSamplePwmCalculateDelay
to determine the On & Off Delay
Is Frequency
or Duty Cycle
changed ?
Yes
Application to formulate the determine
On & Off delay sampling time
Driver to Update the AURIX based GTM TOM
Channel registers with corresponding value of
On or Off Delay
APPLICATION
No
Does Channel
Support
DualSamplePwm
?
Yes
No

7. Sequence of Driver Execution
DMA triggers TOM channel Interrupt
ADC Group Start of Conversion
at Ton Period
Load TOM with Toff delay
After Ton Delay
ADC Raw Data can be read
Conversion Complete Interrupt
ADC Group Start of Conversion at
Toff Period
Load TOM with Ton delay
After Toff Delay
Edge that Activates the Output is
reached
Edge that De-Activates the Output is
reached
DMA triggers TOM channel Interrupt
Ton
Toff
Ton
Toff
Ton
Delay
Toff
Delay

8. Ton
Toff
Ton
Delay
DMA to Start TOM for
reading Analog Data
TOM Interrupt to
Start ADC Conversion
Conversion complete
notification to read
the analog data
Ton
Toff
Toff
Delay
DMA to Start TOM for
reading Analog Data
TOM Interrupt to
Start ADC Conversion
Conversion complete
notification to read
the analog data