SAMV71 Xplained Ultra Software Package 1.4

Working with PIO Parallel Capture Mode
[peripherals_module]

Collaboration diagram for Working with PIO Parallel Capture Mode:

The PIO Parallel Capture Mode driver provides the interface to configure and use the PIO Parallel Capture Mode peripheral.

The PIO Controller integrates an interface able to read data from a CMOS digital image sensor, a high-speed parallel ADC, a DSP synchronous port in synchronous mode, etc.... For better understanding and to ease reading, the following description uses an example with a CMOS digital image sensor

To use the PIO Parallel Capture, the user has to follow these few steps:

For more accurate information, please look at the PIO Parallel Capture Mode section of the Datasheet.

API Usage:

  1. Configurate the interrupt for PIOA, can be done by PIO_InitializeInterrupts()
  2. Initialize the PIO Parallel Capture API by filing the SpioCaptureInit structure options:
    • alwaysSampling: for sample data with or without take in account ENABLE pins.
    • halfSampling: for sample all data or only one time out of two
  3. Call PIO_CaptureInit() for init and enable the PDC, init the PIO capture.
  4. Call PIO_CaptureEnable() for enable the PIO Parallel Capture.
  5. When an interrupt is received, the PIO_CaptureHandler() is call and the respective callback is launch.
  6. When the transfer is complete, the user need to disable interrupt with PIO_CaptureDisableIt(). Otherwise, the PDC will send an interrupt.
  7. The data receive by the PIO Parallel Capture is inside the buffer passed in the PIO_CaptureInit().

Related files :
pio_capture.c
pio_capture.h

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