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Programming Model
10-52
ADSP-2126x SHARC Processor Hardware Reference
Switching from Receive to Receive/Transmit DMA
Use the following sequence to switch from receive to transmit DMA. Note
that
TXSPIx
and
RXSPIx
are registers but they may not contain any bits,
only address information.
With disabled SPI:
1. Write 0x00 to the
SPICTLx
registers to disable SPI. Disabling SPI
also clears the
RXSPIx
/
TXSPIx
register contents and the buffer
status.
2. Disable DMA and clear the DMA FIFO by writing 0x80 to the
SPIDMACx
registers. This ensures that any data from a previous
DMA operation is cleared because the
SPICLK
signal runs for five
more word transfers even after the DMA count falls to zero in the
receive DMA.
3. Clear all errors by writing to the
SPISTATx
registers. This ensures
that no interrupts occur due to errors from a previous DMA
operation.
4. Reconfigure the
SPICTLx
registers and enable SPI.
5. Configure DMA by writing to the DMA parameter registers and
the
SPIDMACx
register.
Содержание ADSP-21261 SHARC
Страница 30: ...Contents xxx ADSP 2126x SHARC Processor Hardware Reference ...
Страница 40: ...Register Diagram Conventions xl ADSP 2126x SHARC Processor Hardware Reference ...
Страница 58: ...Differences From Previous SHARCs 1 18 ADSP 2126x SHARC Processor Hardware Reference ...
Страница 112: ...Secondary Processing Element PEy 2 54 ADSP 2126x SHARC Processor Hardware Reference ...
Страница 178: ...Summary 3 66 ADSP 2126x SHARC Processor Hardware Reference ...
Страница 204: ...DAG Instruction Summary 4 26 ADSP 2126x SHARC Processor Hardware Reference ...
Страница 322: ...Setting Up DMA 7 32 ADSP 2126x SHARC Processor Hardware Reference ...
Страница 436: ...SPORT Programming Examples 9 86 ADSP 2126x SHARC Processor Hardware Reference ...
Страница 521: ...ADSP 2126x SHARC Processor Hardware Reference 11 31 Input Data Port rts IDP_ISR end ...
Страница 522: ...Input Data Port Programming Example 11 32 ADSP 2126x SHARC Processor Hardware Reference ...
Страница 590: ...Timer Programming Examples 14 20 ADSP 2126x SHARC Processor Hardware Reference ...
Страница 796: ...I O Processor Registers A 174 ADSP 2126x SHARC Processor Hardware Reference ...
Страница 800: ...B 4 ADSP 2126x SHARC Processor Core Manual ...
Страница 846: ...Index I 36 ADSP 2126x SHARC Processor Hardware Reference ...