donghengqaz commented on a change in pull request #1610:
URL: https://github.com/apache/incubator-nuttx/pull/1610#discussion_r473924509
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File path: arch/xtensa/src/esp32/Kconfig
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@@ -362,11 +362,53 @@ endmenu # I2C configuration
menu "SPI configuration"
depends on ESP32_SPI
+config ESP32_SPI_SWCS
+ bool "SPI software CS"
+ default y
+ ---help---
+ Use SPI software CS.
+
+config ESP32_SPI_UDCS
+ bool "User defined CS"
+ default n
+ depends on ESP32_SPI_SWCS
+ ---help---
+ Use user defined CS.
+
+choice
+ prompt "DMA owner"
+ default ESP32_SPI2_DMA
+ depends on ESP32_SPI2 || ESP32_SPI3
+ ---help---
+ Select which SPI owns DMA, only one SPI DMA is available, so
+ only one SPI can use DMA.
Review comment:
Yes, you are right. I mean DMA channel here, not just DMA.
ESP32 has 4 SPI hardware controllers, SPI0 for code flash, SPI1 is a little
different from SPI2 and SPI3, because it has an arbiter connecting to IO, add
its I/O pins are same as SPI0, so I have not added SPI1 driver.
My original idea was keeping a channel for SPI1, and driver only uses one
channel. So it is what it is now.
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