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feat(rmt): adds new function to send specific number of loops #11748

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@SuGlider SuGlider commented Aug 20, 2025 •
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Description of Change

Adds a new function rmtWriteRepeated() to send a specific number of times, repeating the same RMT Symbols.

Adds:
bool rmtWriteRepeated(int pin, rmt_data_t *data, size_t num_rmt_symbols, uint32_t loop_count)

It will send a pattern defined by *data RMT Symbols for loop_count times (repeated).
This is different from rmtWriteLooping(), which will repeat it for ever (endless looping).

Note: ESP32 doesn't support SOC_RMT_SUPPORT_TX_LOOP_COUNT

Test Scenarios

Tested with ESP32 and ESP32-S3.
Based on the example modified in the PR (RMT_LED_Blink.ino)

  • [OK] test it, specially when RMT channel is already sending something and it changes the loop mode/count.

Related links

Closes #11731

@SuGlider
feat(rmt): adds new function to send specific number of loops
3078091 
Adds a new function `rmtWriteLoopingCount()` to send a specific number of times, repeating the same RMT Symbols.
@SuGlider SuGlider added this to the 3.3.0 milestone Aug 20, 2025
@SuGlider SuGlider self-assigned this Aug 20, 2025
@SuGlider SuGlider requested a review from a team as a code owner August 20, 2025 14:25
@SuGlider SuGlider added the Area: Peripherals API Relates to peripheral's APIs. label Aug 20, 2025
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github-actions bot commented Aug 20, 2025 •
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Warnings
⚠️

Some issues found for the commit messages in this PR:

  • the commit message "feat(rmt): adds new function to send specific number of loops":
    • body's lines must not be longer than 100 characters
  • the commit message "feat(rmt): rmtWriteLoopingCount improvement":
    • body's lines must not be longer than 100 characters
  • the commit message "rmt(fix): improve code readness":
    • type/action should be one of [change, ci, docs, feat, fix, refactor, remove, revert, test]
  • the commit message "rmt(fix): improve code reliability":
    • type/action should be one of [change, ci, docs, feat, fix, refactor, remove, revert, test]

Please fix these commit messages - here are some basic tips:

  • follow Conventional Commits style
  • correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue
  • allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test
  • sufficiently descriptive message summary should be between 10 to 72 characters and start with upper case letter
  • avoid Jira references in commit messages (unavailable/irrelevant for our customers)

TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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Generated by 🚫 dangerJS against d1434bd

@SuGlider
feat(rmt): adds new function to send specific number of loops
ddf778a 
Adds:
bool rmtWriteLoopingCount(int pin, rmt_data_t *data, size_t num_rmt_symbols, uint32_t loop_count)

It will send a pattern defined by `*data` RMT Symbols for `loop_count` times (repeated).

This is different from `rmtWriteLooping()`, which will repeat it for ever (endless looping).
@SuGlider SuGlider moved this from Todo to In Progress in Arduino ESP32 Core Project Roadmap Aug 20, 2025
@SuGlider SuGlider marked this pull request as draft August 20, 2025 14:37
SuGlider
SuGlider commented Aug 20, 2025
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Test Results

 76 files   76 suites   13m 11s ⏱️
 38 tests  38 ✅ 0 💤 0 ❌
241 runs  241 ✅ 0 💤 0 ❌

Results for commit d1434bd.

♻️ This comment has been updated with latest results.

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Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

MemoryFLASH [bytes]FLASH [%]RAM [bytes]RAM [%]
TargetDECINCDECINCDECINCDECINC
ESP32C50⚠️ +3880.00⚠️ +0.12000.000.00
ESP32P40⚠️ +3900.00⚠️ +0.11000.000.00
ESP32S3💚 -16⚠️ +2880.00⚠️ +0.09000.000.00
ESP32S2💚 -4⚠️ +2840.00⚠️ +0.10000.000.00
ESP32C30⚠️ +3920.00⚠️ +0.13000.000.00
ESP32C60⚠️ +3880.00⚠️ +0.14000.000.00
ESP32H20⚠️ +3860.00⚠️ +0.12000.000.00
ESP32💚 -16⚠️ +2800.00⚠️ +0.09000.000.00
Click to expand the detailed deltas report [usage change in BYTES]
TargetESP32C5ESP32P4ESP32S3ESP32S2ESP32C3ESP32C6ESP32H2ESP32
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libraries/BluetoothSerial/examples/bt_classic_device_discovery--------------00
libraries/BluetoothSerial/examples/bt_remove_paired_devices--------------00
libraries/ESP32/examples/DeepSleep/SmoothBlink_ULP_Code--------------00
libraries/Ethernet/examples/ETH_LAN8720--------------00
libraries/SimpleBLE/examples/SimpleBleDevice--------------00

@SuGlider SuGlider requested a review from Copilot September 5, 2025 16:43
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SuGlider and others added 2 commits September 5, 2025 15:35
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feat(rmt): check the loop count parameter
f5d0513 
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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feat(rmt): improve commentaries
e9aa349 
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@SuGlider SuGlider requested a review from Copilot September 5, 2025 18:38
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@SuGlider SuGlider requested a review from Copilot September 5, 2025 19:28
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rmt(fix): improve code readness
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@SuGlider SuGlider requested a review from Copilot September 5, 2025 22:57
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@SuGlider SuGlider requested a review from Copilot September 6, 2025 03:59
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Pull Request Overview

This PR adds a new RMT function rmtWriteRepeated() that allows transmitting RMT data patterns a specific number of times, providing a middle ground between single transmission and infinite looping.

Key changes:

  • Adds rmtWriteRepeated() function with loop count parameter
  • Modifies internal _rmtWrite() function to support finite loop counts
  • Updates documentation to clarify looping behavior differences

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File Description
cores/esp32/esp32-hal-rmt.h Adds function declaration and updates documentation for the new repeated write functionality
cores/esp32/esp32-hal-rmt.c Implements the core logic for repeated transmission with finite loop counts
libraries/ESP32/examples/RMT/RMT_LED_Blink/RMT_LED_Blink.ino Adds example usage demonstrating the new repeated write function

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@SuGlider SuGlider moved this from In Progress to In Review in Arduino ESP32 Core Project Roadmap Sep 6, 2025
SuGlider and others added 2 commits September 6, 2025 01:07
@SuGlider @Copilot
fix(rmt): adds missing return value
7fffb38 
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@SuGlider @Copilot
feat(rmt): improve commentaries
d1434bd 
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@SuGlider SuGlider marked this pull request as ready for review September 6, 2025 04:11
@SuGlider SuGlider added the Status: Review needed Issue or PR is awaiting review label Sep 6, 2025
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Labels
Area: Peripherals API Relates to peripheral's APIs. Status: Review needed Issue or PR is awaiting review
Projects
Arduino ESP32 Core Project Roadmap
Status: In Review
Milestone
3.3.0
Development

Successfully merging this pull request may close these issues.

Add rmtWriteLoopingCount function to set loop count
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