Hello, I noticed an example configuration for SD card reader + ESP32 support
has been recently added to NuttX (esp32-devkitc:mmcsdspi). This configuration
defines the option "CONFIG_ESP32_SPI_SWCS", which I suppose should control the
CS (chip select) pin by code/software. Whenever a command is to be sent to the
SD card module, the esp32_spi_select() function (defined in
./arch/xtensa/src/esp32/esp32_spi.c) is called, but the CS line does not
toggle, being always high. Disabling CONFIG_ESP32_SPI_SWCS, i.e., making the CS
line to be controlled by hardware, works just fine. Could it be that
"CONFIG_ESP32_SPI_SWCS" has a bug? What's the purpose of
"CONFIG_ESP32_SPI_SWCS" since the SPI CS pin can always be controlled by
hardware?
I tested this with the following code:
URL: https://github.com/apache/incubator-nuttx/
Branch: master
Last commit: 07792a696bf3bcecc7d34ae061ff92ab17b4f0d2
Thank you. --
Regards.Jardel Lucca
