Xtensa
Warning: The ESP32 support is highly experimental and prone to be broken. This description is work in progress.
Building FPC
Preparations
So far Linux and Mac only
Install esp-idf based on the instructions given here:
Get Started (for Stable Release)
Follow the instructions to a least step 8 where you build the hello_word demo project.
copy all the freshly compiled .a files from the current project directory to a directory of your choice:
mkdir ~/esp/xtensa-esp32-elf-libs find . -name "*.a" -exec cp {} ~/esp/xtensa-esp32-elf-libs \;
Now you are ready to compile fpc and rtl.
execute
export IDF_PATH=~/esp/esp-idf source ~/esp/esp-idf/export.sh
to get the path and environment set (namely tools path and $IDF_PATH are needed)
Change into the fpc directory and run
lazbuild compiler/ppcxtens.lpi
to get pp .
now compile the rtl:
cd ../rtl/freertos make FPC=../../compiler/xtensa/pp OS_TARGET=freertos "OPT=-Cplx6 -Cawindowed -XPxtensa-esp32-elf- -Cfhard" clean all
Create a hello world program in the fpc dir and compile it with
compiler/xtensa/pp -Furtl/units/xtensa-freertos/ -Tfreertos -Cawindowed -XPxtensa-esp32-elf- -O3 -Wpesp32 -Fl~/esp/xtensa-esp32-elf-libs -Fl~/.espressif/tools/xtensa-esp32-elf/esp-2019r2-8.2.0/xtensa-esp32-elf/xtensa-esp32-elf/lib/ hello
Get partition-table.bin and bootloader.bin from the hello_world example compiled above and copy them into the same dir as the compiled hello.bin
Flash with
esptool.py -p /dev/ttyUSB0 -b 460800 --before default_reset --after hard_reset --chip esp32 write_flash --flash_mode dio --flash_size detect --flash_freq 40m 0x1000 bootloader.bin 0x8000 partition-table.bin 0x10000 hello.bin
Monitor the output with:
idf_monitor.py --port /dev/ttyUSB0 hello.elf