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Support for Espressif SDK (ESP32, etc)

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Three environment variables must be set to use this variant:

   export ZEPHYR_GCC_VARIANT="espressif"
   export ESP_IDF_PATH=/path/to/esp-idf
   export ESPRESSIF_TOOLCHAIN_PATH=/path/to/xtensa-esp32-elf/

ESP-IDF is the SDK provided by Espressif.  It contains, among other things,
the HAL and header files for registers and ROM functions used by the Zephyr
port.  At this stage, with the exception of the HAL library, none of the
binary blobs provided by ESP-IDF are used.  This can be obtained directly
from Espressif, at <https://github.com/espressif/esp-idf>.

Instructions on how to obtain the toolchain are detailed in the README for
ESP-IDF.

Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
This commit is contained in:
Leandro Pereira 2017-05-03 13:13:13 -07:00 • committed by Anas Nashif
commit bb19e08cde
1 changed files with 21 additions and 0 deletions
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21
scripts/Makefile.toolchain.espressif Normal file
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ifndef ESPRESSIF_TOOLCHAIN_PATH
$(error ESPRESSIF_TOOLCHAIN_PATH is not set)
endif
ifndef ESP_IDF_PATH
$(error ESP_IDF_PATH is not set)
endif
CROSS_COMPILE = ${ESPRESSIF_TOOLCHAIN_PATH}/bin/xtensa-esp32-elf-
TOOLCHAIN_LIBS = gcc hal
LIBGCC_DIR = $(shell dirname `$(CROSS_COMPILE)gcc ${KBUILD_CFLAGS} -print-libgcc-file-name`)
LIB_INCLUDE_DIR += -L${ESP_IDF_PATH}/components/esp32 -L${LIBGCC_DIR}
TOOLCHAIN_CFLAGS = -I${ESPRESSIF_TOOLCHAIN_PATH}/xtensa-esp32-elf/include
ZEPHYRINCLUDE += -I${ESP_IDF_PATH}/components/esp32/include
ZEPHYRINCLUDE += -I${ESP_IDF_PATH}/components/soc/esp32/include
export CROSS_COMPILE TOOLCHAIN_LIBS TOOLCHAIN_CFLAGS LIB_INCLUDE_DIR