Ensure that enum values are used When assigning `pull_up_en` and `pull_down_en`
fields of `gpio_config_t`. Helps avoid `invalid conversion` errors when
building those code snippets in C++.
The Linux build was broken after IDF flash API was updated without updating
the Linux stub library in the example. This commit updates the spi_flash stub
library such that:
- The API now matches same API as IDF's spi_flash component
- Links the stub_esp32 library to pull in basic types and defines
Example linux build of the example demonstrates "esp32" and "spi_flash" stub
libraries (roughly analogous to "esp_system" and "spi_flash" components).
This commit moves the "flash_ops.c" file to the "spi_flash" stub library as it
is a flash related funciton.
Also renamed the header to "esp_flash.h" (in order to match current header name
in IDF). This is a prerequisite to fixing the linux build of this example.
The build-esp32p4.sh and run-esp32p4.sh scripts are not symbolic links to the
base scripts, leading to a "permission denied" error. This commit changes their
types to symbolic links, in line with the other targets.
Darian Leung