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feat(perimgr): add function to retrieve detaching CB #11700

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@SuGlider SuGlider commented Aug 7, 2025 •
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Description of Change

Allows to get the CB pointer for a Peripheral Manager Bus Type.
It can be used to verify if it is already set and also in case the application needs to change the CB to something else and latter restore the original CB to that Bus Type.

PR also intializes all CB pinters to NULL.

Tests scenarios

ESP32 using LOG Debug information.

#include "esp32-hal-periman.h"

static bool _uartRXPinDetachBus(void *busptr) {
  // does nothing and keeps the UART driver running attached to RX pin
  log_d("_uartRXPinDetachBus called");
  return true;
}

void setup(){
  Serial.begin(115200); // Serial defaults pins with default detach periman CB
  // store the UART RX deinit function
  peripheral_bus_deinit_cb_t UART_RX_PerimanCB =  perimanGetBusDeinit(ESP32_BUS_TYPE_UART_RX)
  // change the UART RX detaching function -- TX kept the same
  perimanSetBusDeinit(ESP32_BUS_TYPE_UART_RX, _uartRXPinDetachBus);
  Serial.println("TESTING UART0 TX ...");

  pinMode(RX, INPUT); // changes the UART0 RX pin function to GPIO INPUT, but doesn't dettach UART RX function
  for (int i = 0; i < 10; i++) {
    int val = digitalRead(RX); // read it as DIGITAL level
    Serial.println("#" + String(i) + " Read Val = " + val ? "HIGH" : "LOW");
    delay(500);
  }
  // restore the UART RX detach function
  perimanSetBusDeinit(ESP32_BUS_TYPE_UART_RX, UART_RX_PerimanCB);

 Serial.end();
}

void loop() {}

Related links

Closes #11666

SuGlider added 2 commits August 7, 2025 12:28
@SuGlider
feat(perimgr): add function to retrieve detaching CB
6d93baa 
Allows to get the CB pointer for a Peripheral Manager Bus Type. It can be used to verify if it is already set and also in case the application needs to change the CB to something else and latter restore the original CB to that Bus Type.
@SuGlider
feat(perimgr): add function to retrieve detaching CB
7103ce8
@SuGlider SuGlider added this to the 3.3.0 milestone Aug 7, 2025
@SuGlider SuGlider self-assigned this Aug 7, 2025
@SuGlider SuGlider requested a review from a team as a code owner August 7, 2025 15:56
@SuGlider SuGlider added the Area: Peripherals API Relates to peripheral's APIs. label Aug 7, 2025
@SuGlider SuGlider marked this pull request as draft August 7, 2025 15:56
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github-actions bot commented Aug 7, 2025 •
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Warnings
⚠️

Some issues found for the commit messages in this PR:

  • the commit message "feat(perimgr): add function to retrieve detaching CB":
    • body's lines must not be longer than 100 characters

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

  • follow Conventional Commits style
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  • sufficiently descriptive message summary should be between 10 to 72 characters and start with upper case letter
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@SuGlider SuGlider mentioned this pull request Aug 7, 2025
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@SuGlider SuGlider moved this from Todo to In Progress in Arduino ESP32 Core Project Roadmap Aug 7, 2025
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github-actions bot commented Aug 7, 2025 •
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Test Results

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

Results for commit 6334a02.

♻️ 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
ESP32C5000.000.00000.000.00
ESP32P4000.000.00000.000.00
ESP32S3000.000.00000.000.00
ESP32S2000.000.00000.000.00
ESP32C3000.000.00000.000.00
ESP32C6000.000.00000.000.00
ESP32H2000.000.00000.000.00
ESP320⚠️ +160.000.00000.000.00
Click to expand the detailed deltas report [usage change in BYTES]
TargetESP32C5ESP32P4ESP32S3ESP32S2ESP32C3ESP32C6ESP32H2ESP32
ExampleFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAMFLASHRAM
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Labels
Area: Peripherals API Relates to peripheral's APIs.
Projects
Arduino ESP32 Core Project Roadmap
Status: In Progress
Milestone
3.3.0
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RMT & UART can not share RX pin anymore
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