8.3.1 Design Flow

The following steps are used to enable the PDMA in the application:

  1. Enable PDMA by using the MSS configurator in the application, as shown in the following figure.
    Figure 8-4. Enable PDMA
  2. Configure the AHB bus matrix master to provide weights to PDMA, as shown in the following figure.
    Figure 8-5. PDMA AHB Bus Master Matrix Configuration
  3. To configure the PDMA to transfer data between fabric peripherals (associated on FIC_0 and FIC_1) and MSS memories, select the PDMA configurator, as shown in the following figure.
    Figure 8-6. PDMA Transfers Data Between FIC and MSS Memory
  4. The PDMA signals in top-level instance are shown in the following figure.
    Figure 8-7. PDMA Signals
  5. Generate the component by clicking Generate Component or by selecting SmartDesign > Generate Component
. For more information on generating the component, see the latest SmartDesign User Guide on Libero SoC Documentation page. The firmware driver folder and SoftConsole workspace are included into the project. Click the highlighted Configure firmware button as shown in the following figure to find the PDMA drivers.
    Figure 8-8. PDMA Driver User Guide
  6. Complete the following steps:
    1. Click Generate Bitstream under Program Design to complete *.fdb file generation.
    2. Double-click Export Firmware under Handoff Design for Firmware Development in the Libero SoC design flow window to generate the SoftConsole Firmware Project. The SoftConsole folder contains the mss_pdma firmware driver. The firmware driver, mss_pdma (mss_pdma.c and mss_pdma.h) which provides a set of functions for controlling the MSS PDMA transfers, can also be downloaded from the Microchip firmware catalog. The following table lists the APIs for PDMA. For more information on the APIs, see the Smartfusion2_MSS_PDMA_Driver_UG as shown in the preceding figure.
      Table 8-3. MSS PDMA APIs
      Category API Description and Usage
      Initialization PDMA_init() Initializes PDMA
      Configuration PDMA_configure() Channel priority

      Transfer size

      Source and/or destination address increment

      Source or destination of DMA transfer

      Insert wait states

      Selects the peripheral and direction

      Selects the transfer type
      PDMA_pause() Pauses PDMA transfer
      PDMA_resume() Resumes PDMA transfer
      PDMA_abort() Aborts the PDMA transfer
      DMA transfer and control PDMA_start() Starts PDMA transfer
      PDMA_load_next_buffer() Loads with next buffer of data
      PDMA_status() Gets the status of PDMA transfer
      Interrupt control functions PDMA_set_irq_handler() Register PDMA channel interrupt handler functions with the driver
      PDMA_enable_irq() Enables interrupt for Cortex®-M3 processor and channel interrupt.
      PDMA_clear_irq() Clears the Cortex-M3 processor and channel interrupts.
      PDMA_disables_irq() Disables the interrupts for specified channel
  7. For more information on PDMA usage, the sample projects are available and can be generated, as shown in the following figure.
Figure 8-9. PDMA Examples