RMT receive filter issue (IDFGH-12500)

[gabrielgvicente]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

ESP-IDF v5.1.2-dirty

Espressif SoC revision.

ESP32-WROOM-32E

Operating System used.

macOS

How did you build your project?

VS Code IDE

If you are using Windows, please specify command line type.

None

Development Kit.

Personalized board

Power Supply used.

External 3.3V

What is the expected behavior?

I need to read a remote control and obtain signals above 250us.

What is the actual behavior?

but I am not successful when applying the RMT receiver filter, I receive signals below 50uS.

Steps to reproduce.

rmt_receive_config_t receive_config = {
.signal_range_min_ns = 250000,
.signal_range_max_ns = 1250000

};
rmt_rx_channel_config_t rx_channel_cfg = {
// .clk_src = RMT_CLK_SRC_DEFAULT,
.clk_src = RMT_CLK_SRC_REF_TICK,
.resolution_hz = 1000000,
.mem_block_symbols = 64,
.gpio_num = rf_pin,
.flags.invert_in = true,
.flags.with_dma = false,
};

Debug Logs.

No response

More Information.

No response

[suda-morris]

@gabrielgvicente Thanks for the report, I can confirm the issue. 🐛 For now, I would suspect the hardware maybe still using the APB (which is 80MHz) as the clock source for doing the filter, thus even you set 250us, the real bound may be 250/80 = 3.125 us, it only filter out 3us pulses...

We will need some time to get some feedback from the digital team.

[gabrielgvicente]

Hello Suda-Morris, thank you for your reply, I will wait for the team's response. This filter is very important for the functioning of my application

[gabrielgvicente]

Even so, the maximum filter I can apply will be 3uS?