[GitHub] [incubator-nuttx] davids5 commented on a change in pull request #4002: Kinetis Replace DMA with a proper eDMA driver and use it on SPI and Serial

[GitBox <gi...@apache.org>]

davids5 commented on a change in pull request #4002:
URL: https://github.com/apache/incubator-nuttx/pull/4002#discussion_r661803408



##########
File path: arch/arm/src/kinetis/Kconfig
##########
@@ -1114,6 +1114,96 @@ config KINETIS_SD4BIT_FREQ
 endif
 endmenu # Kinetis SDHC Configuration
 
+menu "eDMA Configuration"
+	depends on KINETIS_EDMA
+
+config KINETIS_EDMA_NTCD
+	int "Number of transfer descriptors"
+	default 0
+	---help---
+		Number of pre-allocated transfer descriptors.  Needed for scatter-
+		gather DMA.  Make to be set to zero to disable in-memory TCDs in
+		which case only the TCD channel registers will be used and scatter-
+		will not be supported.
+
+config KINETIS_EDMA_ELINK
+	bool "Channeling Linking"
+	default n
+	---help---
+		This option enables optional minor or major loop channel linking:
+
+		Minor loop channel linking:  As the channel completes the minor
+		loop, this flag enables linking to another channel. The link target
+		channel initiates a channel service request via an internal
+		mechanism that sets the TCDn_CSR[START] bit of the specified
+		channel.
+
+		If minor loop channel linking is disabled, this link mechanism is
+		suppressed in favor of the major loop channel linking.
+
+		Major loop channel linking:  As the channel completes the minor
+		loop, this option enables the linking to another channel. The link
+		target channel initiates a channel service request via an internal
+		mechanism that sets the TCDn_CSR[START] bit of the linked channel.
+
+config KINETIS_EDMA_ERCA
+	bool "Round Robin Channel Arbitration"
+	default n
+	---help---
+		Normally, a fixed priority arbitration is used for channel
+		selection.  If this option is selected, round robin arbitration is
+		used for channel selection.
+
+config KINETIS_EDMA_ERGA
+	bool "Round Robin Group Arbitration"
+	default n
+	---help---
+		Normally, a fixed priority arbitration is used for channel
+		selection among the groups.  If this option is selected,
+		round Round robin arbitration is used for selection among
+		the groups.
+
+config KINETIS_EDMA_HOE
+	bool "Halt On Error"
+	default y
+	---help---
+		Any error causes the HALT bit to set. Subsequently, all service
+		requests are ignored until the HALT bit is cleared.
+
+config KINETIS_EDMA_CLM
+	bool "Continuous Link Mode"
+	default n
+	---help---
+		By default, A minor loop channel link made to itself goes through
+		channel arbitration before being activated again.  If this option is
+		selected, a minor loop channel link made to itself does not go
+		through channel arbitration before being activated again. Upon minor
+		loop completion, the channel activates again if that channel has a
+		minor loop channel link enabled and the link channel is itself. This
+		effectively applies the minor loop offsets and restarts the next
+		minor loop.
+
+config KINETIS_EDMA_EMLIM
+	bool "Minor Loop Mapping"
+	default n
+	---help---
+		Normally TCD word 2 is a 32-bit NBYTES field.  When this option is
+		enabled, TCD word 2 is redefined to include individual enable fields,
+		an offset field, and the NBYTES field.  The individual enable fields
+		allow the minor loop offset to be applied to the source address, the
+		destination address, or both. The NBYTES field is reduced when either
+		offset is enabled.
+
+config KINETIS_EDMA_EDBG
+	bool "Enable Debug"
+	default n

Review comment:
       No. This is the thing the allows the DMA to be stopped while stopped in a JTag.




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