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DSP56857 データシート(PDF) 234 Page - Freescale Semiconductor, Inc |
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DSP56857 データシート(HTML) 234 Page - Freescale Semiconductor, Inc |
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234 / 662 page  Programming Examples 5685X Digital Signal Controller User Manual, Rev. 4 9-16 Freescale Semiconductor Note: In the circular queue mode, the DMA operation runs endlessly until the DMA is explicitly turned off by the processor. If the byte mode is selected, source and destination addresses have no boundary restrictions. Figure 9-11. DMA Circular Queue Operation To configure the DMA to perform this operation, the following steps would be taken: 1. Write $001F to the DMA Source Address (high) register 2. Write $FFE4 to the DMA Source Address (low) register 3. Write $0000 to the DMA Destination Address (high) register 4. Write $5000 to the DMA Destination Address (low) register 5. Write $0028 (hex = 40 decimal) to the DMA Transfer Count register 6. Write $0190 (hex = 400 decimal) to the DMA Circular Queue Size register 7. Write $D032 to the DMA Transfer Control register Steps 1 through 6 above may be performed in any order; however, step seven must be performed last. In step seven follow these steps: • The DMA is enabled (DMAON = 1) • DMA Interrupts are enabled (INTRON = 1) • The DMA Interrupt Pending bit is cleared (INTERPEND = 0) 40-word packet 40-word packet 40-word packet 40-word packet 40-word packet 40-word packet 40-word packet 40-word packet 40-word packet 40-word packet 400-Word Circular Buffer $5000 $518F DMA Intr DMA Intr DMA Intr DMA Intr DMA Intr DMA Intr DMA Intr DMA Intr DMA Intr DMA Intr |
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