Microsemi SmartFusion2 - PDMA Use Models; Figure 137 PDMA Examples

Peripheral DMA
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7. For more information on PDMA usage, the sample projects are available and can be generated, as
shown in the following figure.
Figure 137 • PDMA Examples
9.3.2 PDMA Use Models
9.3.2.1 Use Model 1: Peripheral to Memory or Memory to Memory
1. Enable PDMA using the MSS configurator of Libero SoC.
2. Initialize the PDMA using PDMA_init().
3. Check the status of PDMA channel using PDMA_status().
4. Clear if any interrupts are pending PDMA_clear_irq().
5. Configure the following using PDMA_configure().
• Transfer type
• Selection of the peripheral and direction (if peripheral to memory transfer is selected)
• Transfer size (data width)
• Source and destination address increment
• Channel priority
• Wait states (WRITE_ADJ)
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
Table 176 • MSS PDMA APIs (continued)