This project is a template on getting started with assembly programming on the ESP32
To build the project, we use the following
xtensa-esp32-elf-as --warn --fatal-warnings vectors.s -o vectors.o
xtensa-esp32-elf-gcc -Wall -O2 -ffreestanding -c so.c -o so.o
xtensa-esp32-elf-ld -nostdlib -nostartfiles -T so.ld vectors.o so.o -o so.elf
xtensa-esp32-elf-objdump -D so.elf > so.list
xtensa-esp32-elf-objcopy so.elf so.bin -O binaryAlternativly, you can use the build script provided
./build.shHexdump to view the output
$ hexdump -C so.bin
00000000 85 13 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000100 0d f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000110 c0 20 00 39 02 0d f0 00 00 00 00 00 00 00 00 00 |. .9............|
00000120 c0 20 00 28 02 0d f0 00 38 08 00 60 10 03 00 60 |. .(....8..`...`|
00000130 04 03 00 60 80 1a 06 00 08 03 00 60 36 41 00 21 |...`.......`6A.!|
00000140 fa ff 0c 44 ad 02 a5 fd ff b2 ae cf b0 ba 10 ad |...D............|
00000150 02 e5 fb ff a1 f6 ff 0c 4b 65 fb ff 61 f5 ff 31 |........Ke..a..1|
00000160 f5 ff 51 f5 ff bd 04 ad 06 65 fa ff 0c 02 ad 02 |..Q......e......|
00000170 1b 22 e5 f8 ff 37 92 f5 bd 04 50 a5 20 25 f9 ff |."...7....P. %..|
00000180 0c 02 ad 02 1b 22 a5 f7 ff 37 92 f5 46 f5 ff |....."...7..F..|
0000018fTo flash the project, use esptool.py
esptool.py --port /dev/ttyUSB0 write_flash -fm qio 0x00000 so.bin