I get this error when the assembly file is somewhat bigger, but the displacement is still small! This looks like an assembler bug, because the relative offset is constant and not depending on the code preceeding the jumpr .text nop ... // 200 additional NOPs here ... nop jumpr bug,1,ge nop nop nop b...

I2C protocol could be implemented in ULP assembly code. I did this for the DHT-22 protocol, which is slightly less complex, but I think I2C is doable. EDIT: I'll implement and test it for you with the BMP-180 sensor and ADS-1015 ADC EDIT2: See https://github.com/tomtor/ulp-i2c @barosu This example r...

See

http://gist.github.com/tomtor/fa7d6d2cb ... 07330be3a1

For subroutine examples

See also

viewtopic.php?f=2&t=3228

Perhaps related:

Switching timer register, eg
only works when setting the power domain:
In the default setting register 0 remains active!

I build the ULP toolchain with the mentioned fix from the pull request: ./configure --prefix=$HOME/esp/esp32ulp-elf-binutils --target=esp32ulp-elf make make install And wrote a demo with stack and subroutine macros: See https://gist.github.com/tomtor/fa7d6d2cbd8d9b076a503107330be3a1 for full code wi...

Which sentence in readthedocs are you referring to (regarding 'the readthedocs html docu specify that a signed byte offset can be used to read data')? Quoute: https://esp-idf.readthedocs.io/en/latest/api-guides/ulp_instruction_set.html#ld-load-data-from-the-memory ==================================...

https://github.com/espressif/binutils-esp32ulp/blob/43e64677fb5506f0de36f537b48ce5b2ef90003c/gas/testsuite/gas/esp32ulp/esp32ulp_all.s https://github.com/espressif/binutils-esp32ulp/pull/3 Thanks, so it is a toolchain issue. The public toolchain download (got it a few days ago) predates the fix and...

I wrote a working DHT22 driver in ULP assembly and I would like to replace some repeated code with subroutines. However even the most simple test code which inserts a dummy jump in a bigger working program: move r0,loop jump r0 nop loop: nop causes a restart of the ULP. I have not found ANY use of j...

Code in ulp .global x x: .long 0 .global entry entry: move r0, x ld r0, r0, x add r0, r0, 1 halt I comment before with another two tests, and anyone doenst worked Should be e.g.: .global x x: .long 0 .global entry entry: move r1, x // load address of x in r1 ld r0, r1, 0 // load data from x in r0 a...

Regarding programming: We don't have a toolchain for the ULP yet. I have started writing an LLVM backend for it, but LLVM has a bit of a learning curve to it, and also ULP is not the highest thing on the priority list, so I haven't got far yet. I do have a way to generate ULP instructions using C m...